Building level GOST 9416 93. Building levels

STATE STANDARD OF THE UNION OF THE SSR

dateintroductions 01.01.85

This standard applies to building levels (hereinafter referred to as levels) intended to check the horizontal and vertical arrangement of the surfaces of elements of building structures, as well as levels intended to transfer the angle of inclination of a structural part to similar parts in the production of construction and installation works without standardization of metrological characteristics.

The technical level indicators established by this standard meet the requirements of the highest and first quality categories.

1. Types, main dimensions and parameters

1.1. Levels must be made of the following types indicated in Table. 1.

The shape of the hull and windows of the levels are not established by the standard.

1.3. Levels of all types, with the exception of the US1 level, can be made with magnetic inserts (hereinafter referred to as magnetic levels) installed on one of the working planes.

Level type US2

Weight - no more than 0.24 kg.

1 - frame; 2 - ampoule; 3 - lid; 4 - clip; 5 - protective glass

US3 type level

Weight - no more than 0.48 kg.

1 - frame; 2 - ampoule; 3 - lid; 4 - protective glass

US4 type level

1 - frame; 2 - ampoule; 3 - lid; 4 - protective glass

US5 type level

1 - frame; 2 - ampoule; 3 - the block is movable; 4 - the block is fixed; 5 - protective glass

US-6 type level

1 - frame; 2 - ampoule; 3 - block; 4 - protective glass

For free sizes of plastic parts - the 14th grade according to GOST 25349;

1.5. Symbols of levels should consist of a type designation (US1 - US3) or a standard size (US4-1, US4-2, US5-1 - US5-3, US6-1 - US6-4), a group of levels and the designation of this standard.

In the case of manufacturing levels with magnetic inserts, the letter "M" must be additionally indicated after the type designation.

Symbol examplelevel of standard size US5-1 group II:

US5-1-II GOST 9416-83

The same, the magnetic level size US5-2 group I:

US5M-2-I GOST 9416-83

2. Technical requirements

When using bent ampoules, the length of the largest stroke should be at least 0.4 of the circumference of the ampoule tube, but not more than half of it. When using cylindrical straight ampoules, the strokes can be annular.

For levels certified for the first category of quality, it is allowed to apply coatings of other types on the hulls that meet the requirements of clause 2.18.

Oxide coatings must comply with GOST 9.301, operating conditions - group G according to GOST 9.303.

4.2. Continuous control for compliance with the requirements of paragraphs. , , , , - must be carried out visually - by comparison with a standard sample.

4.3. To carry out climatic tests (), the levels are placed in a refrigerating chamber, the temperature in the chamber is lowered to minus (40 ± 3) ° С and kept at this temperature for 2 hours. Then the temperature in the chamber is increased to (20 ± 3) ° С, remove the levels from the chamber and check them for compliance with paragraphs. And .

After that, the levels are placed in the heating chamber, the temperature is raised to (40 ± 3) ° C and kept at this temperature for 2 hours. Then the temperature in the chamber is lowered to (20 ± 3) ° C, the levels are removed from the chamber and checked for compliance with paragraphs. And .

4.4. Checking the levels for compliance should be carried out with a metal ruler according to GOST 427 by measuring the distance from the largest stroke of the ampoule to the protrusion of the block or window in the cover of the level housing.

4.5. Checking levels for the effects of transport shaking () should be carried out on a special stand.

The packed levels are attached to the platform of the test bench without additional external shock absorption, subjected to shaking for 2 hours, and then checked for compliance with the requirements of paragraphs. And .

4.6. Checking the levels for compliance with the requirements must be carried out on the surface plate, and on the surface plate and using a special device.

4.7. The adhesion strength of the magnetic level to the metal surface () is checked for 2 minutes.

4.8. The deviation from the flatness of the working surfaces of the levels () should be checked on a calibration plate of the 1st accuracy class according to GOST 10905 using a ruler of the 1st accuracy class according to GOST 8026 and probes from set No. 1 or 2 according to TU 2-034-225.

4.9. The deviation from parallelism of the working surfaces of the levels of the US3, US4 and US6 types () should be checked on a calibration plate of the 1st accuracy class according to GOST 10905 using an indicator head with a stand.

4.10. The control of the roughness of the working surfaces of the levels () should be carried out with a profilometer or profilograph according to GOST 19300.

4.11. Protective coating control () - according to GOST 9.302.

5. Marking, packaging, transportation and storage

5.1. At each level must be applied:

Trademark of the manufacturer;

Symbol;

Ampoule division price in millimeters per 1 m and in minutes;

Year of issue;

Price (when making a level for retail sale).

The method of applying markings must ensure their safety during the warranty period.

5.2. Preservation of levels - according to GOST 9.014 protection option - VZ-1, VZ-2, VZ-4, VZ-7, VZ-13 or VZ-15.

Building levels, GOST 9416-83

Handling equipment. GOST 9416-83: Building levels. Specifications. OKS: Handling equipment, Equipment for manual work. GOSTs. Building levels. Specifications. class=text>

GOST 9416-83

Building levels. Specifications

GOST 9416-83
Group Zh36

INTERSTATE STANDARD

BUILDING LEVELS
Specifications
building levels. Specifications

OKP 48 3300

Introduction date 1985-01-01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Construction, Road and Municipal Engineering
DEVELOPERS

A.I. Polunin (theme leader), E.V. Zaitseva, N.I. Fedorov

2. APPROVED AND INTRODUCED BY Decree of the State Committee of the USSR for Construction Affairs dated 31.10.83 N 297

3. REPLACE GOST 9416-76

4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

	Item number
GOST 2.601-95
GOST 9.014-78
GOST 9.032-74
GOST 9.104-79
GOST 9.301-86
GOST 9.302-88
GOST 9.303-84
GOST 9.306-85
GOST 166-89
GOST 427-75
GOST 1583-93
GOST 1761-92
GOST 2386-73
GOST 2697-83
GOST 2789-73
GOST 4748-92
GOST 4784-97
GOST 8026-92
GOST 8705-78
GOST 9569-79
GOST 9754-76
GOST 10667-90
GOST 10905-86
GOST 12034-77
GOST 13762-86
GOST 14192-96
GOST 15150-69
GOST 17622-72
GOST 19300-86
GOST 21228-85
GOST 21631-76
GOST 24643-81
GOST 25347-82
GOST 25349-88
TU 2-034-225-87

5. RE-ISSUE

This standard applies to building levels (hereinafter referred to as levels) designed to check the horizontal and vertical arrangement of the surfaces of elements of building structures, as well as levels intended to transfer the angle of inclination of a structural part to similar parts in the production of construction and installation works without standardization of metrological characteristics.
The technical level indicators established by this standard meet the requirements of the highest and first quality categories.

1. TYPES, BASIC DIMENSIONS AND PARAMETERS

1. TYPES, MAIN PARAMETERS AND DIMENSIONS

1.1. Levels must be made of the following types, indicated in Table 1.

Table 1

Level type	Size	Level group by accuracy

		Ampoule division price







	US5-2, US5-3
	US6-1, US6-2
	US6-3, US6-4

1.2. The main dimensions and weight of the levels must correspond to those indicated in Fig. 1-6 and in Table 2-4.

Damn.1. US1 type level

US1 type level

Weight - no more than 0.12 kg.

1 - frame; 2 - ampoule; 3 - lid
Damn.1

Damn.2. Level type US2

Level type US2

Weight - no more than 0.24 kg.

1 - frame; 2 - ampoule; 3 - lid; 4 - clip; 5 - protective glass
Damn.2

Damn.3. US3 type level

US3 type level

Weight - no more than 0.48 kg.

1 - frame; 2 - ampoule; 3 - lid; 4 - protective glass
Damn.3

Damn.4. US4 type level

US4 type level

1 - frame; 2 - ampoule; 3 - lid; 4 - protective glass
Damn.4

Damn.5. US5 type level

US5 type level

1 - frame; 2 - ampoule; 3 - the block is movable; 4 - the block is fixed; 5 - protective glass
Damn.5

Damn.6. US-6 type level

US6 type level

1 - frame; 2 - ampoule; 3 - block; 4 - protective glass
Damn.6

table 2

Table 3

Table 4

Size		Weight, kg, no more than the level with the body
		from profile

The shape of the hull and windows of the levels is not established by the standard.

1.3. Levels of all types, with the exception of the US1 level, can be made with magnetic inserts (hereinafter referred to as magnetic levels) installed on one of the working planes.

1.4. Limit deviations of the main dimensions of the levels and their details must correspond to:
- for landing dimensions of the rotary block - the 8th grade according to GOST 25347 and GOST 25349;
- for free sizes of metal parts - the 14th grade according to GOST 25347;
- for free sizes of plastic parts - the 14th grade according to GOST 25349.

1.5. Symbols of levels should consist of type designations (US1-US3) or standard size (US4-1, US4-2, US5-1-US5-3, US6-1-US6-4), group and this standard.
In the case of manufacturing levels with magnetic inserts, the letter "M" must be additionally indicated after the type designation.
An example of a symbol for a level of standard size US5-1 of group II:

US5-1-II GOST 9416-83

The same, the magnetic level size US5-2 group I:

US5M-2-I GOST 9416-83

2. TECHNICAL REQUIREMENTS

2.1. Levels must be manufactured in accordance with the requirements of this standard according to working drawings and standard samples. Reference samples must be agreed with the basic standardization organization and approved in the prescribed manner.

2.2. For magnetic levels, a magnetic insert must be used, manufactured according to technical documentation approved in the prescribed manner.

2.3. Details of the levels must be made of the materials indicated in Table 5.

Table 5

the name of detail	Material for type levels

	Aluminum alloys according to GOST 1583 or aluminum alloys grades AD 31, 1915 according to GOST 4784
	Aluminum sheet in accordance with GOST 21631 or impact-resistant polystyrene, produced according to technical documentation approved in the prescribed manner
			Impact-resistant polystyrene or polyamide (secondary), produced according to technical documentation approved in the prescribed manner
Protective glass		Structural organic glass according to GOST 10667 or technical organic glass grades TOSP or TOSN according to GOST 17622, or brand A celluloid, transparent, white, polished on both sides according to GOST 21228, or polystyrene produced according to technical documentation approved in the prescribed manner
		Tape made of silicon-manganese bronze 0.6 mm thick, normal accuracy according to GOST 4748 or tape made of tin-phosphor bronze grade BrOF6.5-0.15 0.6 mm thick according to GOST 1761

Note. Other materials may be used provided that the technical requirements established by this standard are met.

2.4. Levels must be manufactured in climatic version U, placement category 1 in accordance with GOST 15150 for operation at temperatures from minus 40 to plus 40 ° WITH.

2.5. For the manufacture of levels, low-precision ampoules of the ADC type, version N according to GOST 2386 or ampoules made according to technical documentation approved in the prescribed manner should be used.
The price of dividing the ampoule, depending on the group of levels, should correspond to that indicated in Table 1.
When using bent ampoules, the length of the largest stroke should be at least 0.4 of the circumference of the ampoule tube, but not more than half of it. When using cylindrical straight ampoules, the strokes can be annular.

2.6. Ampoule filler should be tinted pink, yellow-green or other light colors.

2.7. Ampoule scales should be located symmetrically about the axis of the corresponding cutouts in the covers or protrusions in the level blocks. The symmetry tolerance of the scales is 1.5 mm.

2.8. The levels in the package must withstand transport shaking with an acceleration of 30 m / s and a frequency of 80-120 beats per minute.

2.9. The deviation of the air bubble in the ampoule from the average position, determined by the distance between the largest strokes, at a temperature of plus (20 ± 3) ° C after setting the level on a horizontal (or vertical) plane should not exceed the division of the scale. In this case, the horizontal and vertical planes must be set with an accuracy not exceeding 0.2 of the maximum permissible error of the level ampoules.

2.10. When the level is rotated around the axis of the ampoule by 5° ± 30" in both directions from its middle position, the deviation of the bubble should not exceed the division of the scale.

2.11. Levels, with the exception of levels of types US1, US2 and US5, must have two working planes.

2.12. Magnetic levels installed in their working position on a vertical unpainted metal surface must withstand a static load equal to 0.2 of the mass of the level applied in the direction of the longitudinal axis of the level.
Moving the level under its own weight on a metal surface is not allowed.

2.13. The flatness tolerance of the working surfaces of the housings of levels of group I must correspond to the 10th degree of accuracy, and levels II and III of groups - to the 11th degree of accuracy in accordance with GOST 24643.
For levels certified according to the highest quality category, the flatness tolerance of the working surfaces of the housings of levels of group I must correspond to the 9th degree of accuracy, and levels of groups II and III - to the 10th degree of accuracy in accordance with GOST 24643.

2.14. The parallelism tolerance of the working surfaces of the housings of levels of group I must correspond to the 9th degree of accuracy, and levels II and III of groups - to the 10th degree of accuracy in accordance with GOST 24643.
For levels certified according to the highest quality category, the parallelism tolerance of the working surfaces of the housings of levels I of group must correspond to the 8th degree of accuracy, and levels II and III of groups - the 9th degree of accuracy in accordance with GOST 24643.

2.15. The roughness parameter of the working surfaces of the levels should not exceed Ra 6.3 µm according to GOST 2789.

2.16. The movable block of levels should have a smooth ride without jamming.

2.17. Level bodies, except for working planes, must be coated with ML-type enamels in accordance with GOST 9754 or GOST 12034, or have an An.Ox nhr or An.Ox nv coating in accordance with GOST 9.306.
For levels certified for the first category of quality, it is allowed to apply coatings of other types on the hulls that meet the requirements of clause 2.18.

2.18. Paint coatings must be of light colors and comply with class IV according to GOST 9.032 and operating conditions according to group U1 GOST 9.104.
Oxide coatings must comply with GOST 9.301, operating conditions - group G in accordance with GOST 9.303.

2.19. After the adjustment of the ampoules, the heads of the set screws must be painted with a bright color of enamel, which differs from the color of the coating of the body.
The heads of the screws for fastening the rotary block of levels of the US5 type are not painted.

3. ACCEPTANCE RULES

3.1. The levels must be accepted by the technical control of the manufacturer.

3.2. To verify that the levels comply with the requirements of this standard, the manufacturer shall carry out acceptance tests and periodic tests.

3.3. Acceptance and delivery of levels is carried out in batches.
The batch must consist of levels of the same group, of the same type or size, made from the same materials, processed according to the same technological process and simultaneously presented for acceptance according to one document.

3.4. When checking levels for compliance with the requirements of paragraphs 1.2, 2.1 (in terms of compliance with working drawings), 2.7, 2.9, 2.10, 2.12-2.15, a two-stage control is used, for which a sample of levels is carried out in accordance with Table 6.

Table 6

The volume of the batch of levels, pcs.	Stage of control	The volume of one sample, pcs.	The volume of two samples, pcs.	acceptance number	Rejection number

3.5. A batch of levels is accepted if the number of defective levels in the first sample is less than or equal to the acceptance number, and rejected without assigning a second sample if the number of defective levels is greater than or equal to the rejection number.
If the number of defective levels in the first sample is greater than the acceptance number, but less than the rejection number, a second sample is taken.

A batch of levels is accepted if the number of defective levels in two samples is less than or equal to the acceptance number, and rejected if the number of defective levels in two samples is greater than or equal to the acceptance number.

3.6. When checking levels for compliance with the requirements of paragraphs 2.1 (in terms of compliance with standard samples), 2.5, 2.6, 2.11, 2.16-2.19, complete control is used.

3.7. When checking the levels for compliance with the requirements of clauses 2.4 and 2.8, periodic tests should be carried out at least once a year, for which 3% of the levels from the batch are selected, but not less than five levels that have passed acceptance tests.
If, when checking the selected levels, at least one level does not meet the requirements of paragraphs 2.4 or 2.8, repeated tests should be carried out with twice the number of levels selected from the same lot.
The results of the level recheck are final.

4. CONTROL METHODS

4.1. The dimensions of the levels should be checked using a metal ruler with a division value of 1 mm in accordance with GOST 427 or a caliper with a division value of 0.05 or 0.1 mm in accordance with GOST 166.

4.2. Complete control for compliance with the requirements of paragraphs 2.1, 2.5, 2.6, 2.11, 2.16-2.19 must be carried out visually - by comparison with a standard sample.

4.3. To carry out climatic tests (clause 2.4), the levels are placed in a refrigerating chamber, the temperature in the chamber is lowered to minus (40 ± 3) ° С and kept at this temperature for 2 hours. Then the temperature in the chamber is increased to (20 ± 3) °С, remove the levels from the chamber and check them for compliance with paragraphs 2.9 and 2.10.
After that, the levels are placed in the heating chamber, the temperature is raised to (40 ± 3) ° C and kept at this temperature for 2 hours. Then the temperature in the chamber is lowered to (20 ± 3) ° C, the levels are removed from the chamber and checked for compliance with paragraphs 2.9 and 2.10.

4.4. Checking the levels for compliance with clause 2.7 should be carried out with a metal ruler in accordance with GOST 427 by measuring the distance from the largest stroke of the ampoule to the protrusion of the block or window in the cover of the level housing.

4.5. Checking the levels for the effects of transport shaking (p. 2.8) should be carried out on a special stand.
The packed levels are attached to the platform of the test bench without additional external shock absorption, subjected to shaking for 2 hours, and then checked for compliance with the requirements of paragraphs 2.9 and 2.10.

4.6. Checking the levels for compliance with the requirements of clause 2.9 should be carried out on a calibration plate, and according to clause 2.10 - on a calibration plate and using a special device.

4.7. The adhesion strength of the magnetic level to the metal surface (clause 2.12) is checked for 2 minutes.

4.8. Deviation from the flatness of the working surfaces of the levels (clause 2.13) should be checked on a calibration plate of the 1st accuracy class in accordance with GOST 10905 using a ruler of the 1st accuracy class in accordance with GOST 8026 and probes from set No. 1 or 2 in accordance with TU 2-034-225 .

4.9. The deviation from the parallelism of the working surfaces of the levels of the US3, US4 and US6 types (clause 2.14) must be checked on a calibration plate of the 1st accuracy class according to GOST 10905 using an indicator head with a stand.

4.10. The control of the roughness of the working surfaces of the levels (clause 2.15) should be carried out with a profilometer or profilograph according to GOST 19300.

4.11. Protective coating control (clause 2.18) - according to GOST 9.302.

5. MARKING, PACKAGING, TRANSPORT AND STORAGE

5.1. At each level must be applied:
- trademark of the manufacturer;
- symbol;
- the price of dividing the ampoule in millimeters per 1 m and in minutes;
- year of issue.
The method of applying markings must ensure their safety during the warranty period.

5.2. Conservation levels - according to GOST 9.014, protection options - VZ-1, VZ-2, VZ-4, VZ-7, VZ-13 or VZ-15.

5.3. Each level, together with a passport in accordance with GOST 2.601 and an instruction manual, must be packed in a wooden, cardboard, plastic or artificial leather case. The level must not fall out of the case when it is turned over when closed.
The cardboard case must be pasted over with a cloth or binding material with a nitrocellulose coating in accordance with GOST 8705.

5.4. The box should show:
- name or trademark of the manufacturer;
- symbol of the level.

5.5. Cases with levels should be packed in boxes.
The boxes inside must be lined with paper in accordance with GOST 9569, glassine in accordance with GOST 2697 or other waterproof material.
Other packaging is allowed, which ensures the safety of the levels from mechanical damage and moisture during transportation and storage.
Gross weight of boxes - no more than 30 kg.

5.6. Transport marking - according to GOST 14192.

5.7. Transportation and storage of levels - according to GOST 13762.

6. MANUFACTURER WARRANTY

6.1. The manufacturer must ensure that the levels comply with the requirements of this standard, provided that the consumer observes the conditions for their transportation and storage.

6.2. The warranty period for the operation of the levels is 12 months from the date of sale through the distribution network, and for deliveries for off-market consumption - from the date of receipt by the consumer, but not more than 1.5 years from the date of their manufacture.

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It applies to construction levels (hereinafter referred to as levels) designed to check the horizontal and vertical arrangement of the surfaces of elements of building structures, as well as levels intended to transfer the angle of inclination of a structural part to similar parts in the production of construction and installation works without standardization of metrological characteristics.

The technical level indicators established by the standard meet the requirements of the highest and first category of quality.

Replaces GOST 9416-76

1 Types, main dimensions and parameters

2 Technical requirements

3 Acceptance rules

4 Control methods

5 Marking, packaging, transport and storage

6 Manufacturer's warranties

GOST 2697-83Roofing glassine. Specifications
GOST 15150-69Machines, devices and other technical products. Versions for different climatic regions. Categories, conditions of operation, storage and transportation in terms of the impact of environmental climatic factors
GOST 17622-72Glass organic technical. Specifications
GOST 2.601-95 . Replaced by GOST 2.601-2006.
GOST 4784-97 . Replaced by GOST 4784-2019.
GOST 9.032-74Groups, technical requirements and designations
GOST 9.104-79Unified system of protection against corrosion and aging. Paint coatings. Operating condition groups . Replaced by GOST 9.104-2018.
GOST 9.301-86General requirements
GOST 9.302-88Unified system of protection against corrosion and aging. Metallic and non-metallic inorganic coatings. Control methods
GOST 9.303-84Unified system of protection against corrosion and aging. Metallic and non-metallic inorganic coatings. General selection requirements
GOST 9.306-85Unified system of protection against corrosion and aging. Metallic and non-metallic inorganic coatings. Notation
GOST 14192-96Cargo marking
GOST 166-89Calipers. Specifications
GOST 21631-76Sheets of aluminum and aluminum alloys. Specifications
GOST 427-75Metal measuring rulers. Specifications
GOST 9.014-78Unified system of protection against corrosion and aging. Temporary anticorrosive protection of products. General requirements
GOST 25347-82Basic norms of interchangeability. Unified system of tolerances and landings. Tolerance fields and recommended landings. Replaced by GOST 25347-2013.
GOST 2789-73Surface roughness. Parameters and characteristics
GOST 1583-93
GOST 9569-79 . Replaced by GOST 9569-2006.
GOST 19300-86Instruments for measuring surface roughness by the profile method. Contact profilographs. Types and basic parameters
GOST 9754-76Enamels ML-12. Specifications
GOST 10667-90Glass organic sheet. Specifications
GOST 10905-86Calibration and marking plates. Specifications
GOST 12034-77Enamels of the ML-165, ML-165PM and MS-160 brands. Specifications
GOST 13762-86Means of measurement and control of linear and angular dimensions. Marking, packaging, transportation and storage
GOST 14192-77Cargo labeling. Replaced by GOST 14192-96.
GOST 1761-92Strips and ribbons made of tin-phosphorous and tin-zinc bronze. Specifications. Replaced by GOST 1761-2016.
GOST 21228-85Celluloid. Specifications
GOST 2386-73Level ampoules. Specifications
GOST 24643-81Tolerances of the shape and location of surfaces. Numeric values
GOST 25349-88Basic norms of interchangeability. Unified system of tolerances and landings. Tolerance fields for plastic parts
GOST 4748-92Bands and ribbons made of silicon-manganese bronze. Specifications
GOST 8026-92Verification lines. Specifications
GOST 8705-78Binding material with nitrocellulose coating. Specifications
GOST 2.601-2006Unified system of design documentation. operational documents. Replaced by GOST 2.601-2013.
GOST 9569-2006Waxed paper. Specifications
GOST 4784-74Aluminum and aluminum alloys are wrought. Marks. Replaced by GOST 4784-97.
GOST 1583-89Cast aluminum alloys. Specifications. Replaced by GOST 1583-93.

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INTERSTATE STANDARD

Introduction date 01.01.85

The technical level indicators established by this standard meet the requirements of the highest and first quality categories.

1. TYPES, MAIN PARAMETERS AND DIMENSIONS

1.1. Levels must be made of the following types indicated in Table. 1.

Table 1

Level type	Size	Level group by accuracy

		Ampoule division price

1.2. The main dimensions and mass of the levels must correspond to those indicated in the drawing. 1 - 6 and in table. 2 - 4.

US1 type level

Weight - no more than 0.12 kg.

1 - frame; 2 - ampoule; 3 - lid

Level type US2

Weight - no more than 0.24 kg.

1 - frame; 2 - ampoule; 3 - lid; 4 - clip; 5 - protective glass

US3 type level

Weight - no more than 0.48 kg.

1 - frame; 2 - ampoule; 3 - lid; 4 - protective glass

US4 type level

1 - frame; 2 - ampoule; 3 - lid; 4 - protective glass

US5 type level

1 - frame; 2 - ampoule; 3 - the block is movable; 4 - the block is fixed; 5 - protective glass

US6 type level

1 - frame; 2 - ampoule; 3 - block; 4 - protective glass

table 2

Table 3

Table 4

The shape of the hull and windows of the levels is not established by the standard.

1.3. Levels of all types, with the exception of the US1 level, can be made with magnetic inserts (hereinafter referred to as magnetic levels) installed on one of the working planes.

1.4. Limit deviations of the main dimensions of the levels and their details must correspond to:

For landing dimensions of the rotary block - the 8th grade according to GOST 25347 and GOST 25349;

For free sizes of metal parts - the 14th grade according to GOST 25347;

For free sizes of plastic parts - the 14th grade according to GOST 25349.

1.5. Symbols of levels should consist of type designations (US1 - US3) or standard size (US4-1, US4-2, US5-1 - US5-3, US6-1 - US6-4), group and this standard.

In the case of manufacturing levels with magnetic inserts, the letter “M” must be additionally indicated after the type designation.

An example of a symbol for a level of standard size US5-1 of group II:

The same, the magnetic level size US5-2 group I:

2. TECHNICAL REQUIREMENTS

2.2. For magnetic levels, a magnetic insert must be used, manufactured according to technical documentation approved in the prescribed manner.

2.3. The details of the levels must be made of the materials indicated in Table. 5.

Table 5

Note. Other materials may be used provided that the technical requirements established by this standard are met.

2.4. Levels must be manufactured in climatic version U, location category 1 in accordance with GOST 15150 for operation at temperatures from minus 40 to plus 40 °C.

The price of dividing the ampoule, depending on the group of levels, should correspond to that indicated in Table. 1.

2.6. Ampoule filler should be tinted pink, yellow-green or other light colors.

2.7. Ampoule scales should be located symmetrically about the axis of the corresponding cutouts in the covers or protrusions in the level blocks. The symmetry tolerance of the scales is 1.5 mm.

2.8. The levels in the package must withstand transport shaking with an acceleration of 30 m / s 2 and a frequency of 80 - 120 strokes per minute.

2.9. The deviation of the air bubble in the ampoule from the average position, determined by the distance between the largest strokes, at a temperature of plus (20 ± 3) ° C after setting the level on a horizontal (or vertical) plane should not exceed 1/4 of the scale division. In this case, the horizontal and vertical planes must be set with an accuracy not exceeding 0.2 of the maximum permissible error of the level ampoules.

2.10. When the level is rotated around the ampoule axis by 5° ± 30" in both directions from its middle position, the bubble deviation should not exceed 1/2 of the scale division.

2.11. Levels, with the exception of levels of types US1, US2 and US5, must have two working planes.

Moving the level under its own weight on a metal surface is not allowed.

For levels certified according to the highest quality category, the flatness tolerance of the working surfaces of the housings of levels of group I must correspond to the 9th degree of accuracy, and levels II and III of groups - to the 10th degree of accuracy in accordance with GOST 24643.

2.14. The tolerance of parallelism of the working surfaces of the housings of levels I of group must correspond to the 9th degree of accuracy, and levels II and III of groups - the 10th degree of accuracy in accordance with GOST 24643.

For levels certified according to the highest quality category, the parallelism tolerance of the working surfaces of the housings of levels of group I must correspond to the 8th degree of accuracy, and levels II and III of groups - to the 9th degree of accuracy according to GOST 24643.

2.15. The roughness parameter of the working surfaces of the levels should not be more than Ra 6.3 microns according to GOST 2789.

2.16. The movable block of levels should have a smooth ride without jamming.

2.17. Level bodies, except for working planes, must be coated with ML type enamels according to GOST 9754 or according to GOST 12034, or have an An.Oks nkhr or An.Oks nv coating according to GOST 9.306.

For levels certified for the first category of quality, it is allowed to apply coatings of other types on the hulls that meet the requirements of clause 2.18.

2.18. Paint coatings must be of light colors and comply with class IV according to GOST 9.032 and operating conditions according to group U1 GOST 9.104.

Oxide coatings must comply with GOST 9.301, operating conditions - group G according to GOST 9.303.

2.19. After the adjustment of the ampoules, the heads of the set screws must be painted with a bright color of enamel, which differs from the color of the coating of the body.

The heads of the screws for fastening the rotary block of levels of the US5 type are not painted.

3. ACCEPTANCE RULES

3.1. The levels must be accepted by the technical control of the manufacturer.

3.2. To verify that the levels comply with the requirements of this standard, the manufacturer shall carry out acceptance tests and periodic tests.

3.3. Acceptance and delivery of levels is carried out in batches.

The batch must consist of levels of the same group, of the same type or size, made from the same materials, processed according to the same technological process and simultaneously presented for acceptance according to one document.

3.4. When checking levels for compliance with the requirements of paragraphs. 1.2, 2.1 (in terms of compliance with the working drawings), 2.7, 2.9, 2.10, 2.12 - 2.15 apply a two-stage control, for which a sample of levels is carried out in accordance with Table. 6.

Table 6

The volume of the batch of levels, pcs.	Stage of control	The volume of one sample, pcs.	The volume of two samples, pcs.	acceptance number	Rejection number

If the number of defective levels in the first sample is greater than the acceptance number, but less than the rejection number, a second sample is taken.

3.6. When checking levels for compliance with the requirements of paragraphs. 2.1 (in terms of compliance with standard samples), 2.5, 2.6, 2.11, 2.16 - 2.19, complete control is used.

3.7. When checking levels for compliance with the requirements of paragraphs. 2.4 and 2.8, periodic tests should be carried out at least once a year, for which 3% of the levels from the batch are selected, but not less than five levels that have passed acceptance tests.

If, when checking the selected levels, at least one level does not meet the requirements of paragraphs. 2.4 or 2.8, double the number of levels taken from the same lot should be retested.

The results of the level recheck are final.

4. CONTROL METHODS

4.1. The dimensions of the levels should be checked using a metal ruler with a division value of 1 mm according to GOST 427 or a vernier caliper with a division value of 0.05 or 0.1 mm according to GOST 166.

4.2. Continuous control for compliance with the requirements of paragraphs. 2.1, 2.5, 2.6, 2.11, 2.16 - 2.19 must be carried out visually - by comparison with a standard sample.

4.3. To carry out climatic tests (clause 2.4), the levels are placed in a refrigerating chamber, the temperature in the chamber is lowered to minus (40 ± 3) ° C and kept at this temperature for 2 hours. Then the temperature in the chamber is increased to (20 ± 3) °C, remove the levels from the chamber and check them for compliance with paragraphs. 2.9 and 2.10.

After that, the levels are placed in the heating chamber, the temperature is raised to (40 ± 3) °C and kept at this temperature for 2 hours. Then the temperature in the chamber is lowered to (20 ± 3) °C, the levels are removed from the chamber and checked for compliance with paragraphs. 2.9 and 2.10.

4.5. Checking levels for the effects of transport shaking (p. 2.8) should be carried out on a special stand.

4.7. The adhesion strength of the magnetic level to the metal surface (clause 2.12) is checked for 2 minutes.

4.8. The deviation from the flatness of the working surfaces of the levels (clause 2.13) should be checked on a calibration plate of the 1st accuracy class according to GOST 10905 using a ruler of the 1st accuracy class according to GOST 8026 and probes from set No. 1 or 2 according to TU 2-034-225 .

4.9. The deviation from parallelism of the working surfaces of the levels of the US3, US4 and US6 types (clause 2.14) must be checked on a calibration plate of the 1st accuracy class according to

GOST 9416-83

Group Zh36

INTERSTATE STANDARD

BUILDING LEVELS

Specifications

building levels. Specifications

Introduction date 01.01.85

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Construction, Road and Municipal Engineering

DEVELOPERS

A.I. Polunin (topic leader), E.V. Zaitseva, N.I. Fedorov

2. APPROVED AND INTRODUCED BY Decree No. 297 of the USSR State Committee for Construction Affairs dated October 31, 1983

3. REPLACE GOST 9416-76

4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

	Item number		Item number
GOST 2.601-95		GOST 8026-92
GOST 9.014-78		GOST 8705-78
GOST 9.032-74		GOST 9569-79
GOST 9.104-79		GOST 9754-76
GOST 9.301-86		GOST 10667-90
GOST 9.302-88		GOST 10905-86
GOST 9.303-84		GOST 12034-77
GOST 9.306-85		GOST 13762-86

GOST 9.306-85		GOST 15150-69
		GOST 17622-72
GOST 1583-89		GOST 19300-86
GOST 1761-92		GOST 21228-85
GOST 2386-73		GOST 21631-76
GOST 2697-83		GOST 24643-81
GOST 2789-73		GOST 25347-82
GOST 4748-92		GOST 25349-88
GOST 4784-74		TU 2-034-225-87

5. RE-ISSUED 1999

The technical level indicators established by this standard meet the requirements of the highest and first quality categories.

1. Types, main dimensions and parameters

1.1. Levels must be made of the following types indicated in Table. 1.

1.2. The main dimensions and mass of the levels must correspond to those indicated in the drawing. 1-6 and in table. 2-4.

The shape of the hull and windows of the levels are not established by the standard.

1.3. Levels of all types, with the exception of the US1 level, can be made with magnetic inserts (hereinafter referred to as magnetic levels) installed on one of the working planes.

Table 1

Level type	Size	Level group by accuracy

		Ampoule division price







	US5-2, US5-3

	US6-3, US6-4

US1 type level

Weight - no more than 0.12 kg.

1 - frame; 2 - ampoule; 3 - lid

Level type US2

Weight - no more than 0.24 kg.

1 - frame; 2 - ampoule; 3 - lid; 4 - clip; 5 - protective glass

US3 type level

Weight - no more than 0.48 kg.

1 - frame; 2 - ampoule; 3 - lid; 4 - protective glass

US4 type level

1 - frame; 2 - ampoule; 3 - lid; 4 - protective glass

US5 type level

1 - frame; 2 - ampoule; 3 - the block is movable; 4 - the block is fixed; 5 - protective glass

US-6 type level

1 - frame; 2 - ampoule; 3 - block; 4 - protective glass

table 2

Table 3

Table 4

1.4. Limit deviations of the main dimensions of the levels and their details must correspond to:

For landing dimensions of the rotary block - the 8th grade according to GOST 25347 and according to GOST 25349;

For free sizes of metal parts - the 14th grade according to GOST 25347;

For free sizes of plastic parts - the 14th grade according to GOST 25349;

1.5. Symbols for levels should consist of a type designation (US1-US3) or a standard size (US4-1, US4-2, US5-1 US5-3, US6-1 - US6-4), a group of levels and the designation of this standard.

In the case of manufacturing levels with magnetic inserts, the letter "M" must be additionally indicated after the type designation.

An example of a symbol for a level of standard size US5-1 of group II:

US5-1-II GOST 9416-83

The same, the magnetic level size US5-2 group I:

US5M-2-I GOST 9416-83

2. Technical requirements

2.2. For magnetic levels, a magnetic insert must be used, manufactured according to technical documentation approved in the prescribed manner.

2.3. The details of the levels must be made of the materials indicated in Table. 5.

Table 5

the name of detail	Material for type levels

	Aluminum alloys according to GOST 1583 or aluminum alloys grades AD 31, 1915 according to GOST 4784
	Aluminum sheet in accordance with GOST 21631 or impact-resistant polystyrene, produced according to technical documentation approved in the prescribed manner
			Impact-resistant polystyrene or polyamide (secondary), produced according to technical documentation approved in the prescribed manner
Protective glass		Structural organic glass according to GOST 10667 or technical organic glass grades TOSP or TOSN according to GOST 17622, or brand A celluloid, transparent, white, polished on both sides according to GOST 21228, or polystyrene produced according to technical documentation approved in the prescribed manner
		Tape made of silicon-manganese bronze 0.6 mm thick, normal accuracy according to GOST 4748 or tape made of tin-phosphor bronze grade BrOF6.5-0.15 0.6 mm thick according to GOST 1761

Note. Other materials may be used provided that the technical requirements established by this standard are met.

2.4. Levels must be manufactured in climatic version U, location category 1 in accordance with GOST 15150 for operation at temperatures from minus 40 to plus 40 °C.

The price of dividing the ampoule, depending on the group of levels, should correspond to that indicated in Table. 1.

2.6. Ampoule filler should be tinted pink, yellow-green or other light colors.

2.7. Ampoule scales should be located symmetrically about the axis of the corresponding cutouts in the covers or protrusions in the level blocks. The symmetry tolerance of the scales is 1.5 mm.

2.8. The levels in the package must withstand transport shaking with an acceleration of 30 m / s 2 and a frequency of 80-120 beats per minute.

2.9. The deviation of the air bubble in the ampoule from the average position, determined by the distance between the largest strokes, at a temperature of plus (20 ± 3) ° C after setting the level to a horizontal (or vertical) plane should not exceed 1/4 of the scale division. In this case, the horizontal and vertical planes must be set with an accuracy not exceeding 0.2 of the maximum permissible error of the level ampoules.

2.10. When the level is rotated around the axis of the ampoule by 5° ± 30" in both directions from its middle position, the deviation of the bubble should not exceed 1/2 of the scale division.

2.11. Levels, with the exception of levels of types US1, US2 and US5, must have two working planes.

Moving the level under its own weight on a metal surface is not allowed.

2.13. The flatness tolerance of the working surfaces of the housings of levels of group I must correspond to the 10th degree of accuracy, and levels II and III - to the 11th degree of accuracy in accordance with GOST 24643.

For levels certified according to the highest quality category, the flatness tolerance of the working surfaces of the housings of levels of group I must correspond to the 9th degree of accuracy, and levels of groups II and III to the 10th degree of accuracy in accordance with GOST 24643.

For levels certified according to the highest quality category, the parallelism tolerance of the working surfaces of the housings of levels I of group must correspond to the 8th degree of accuracy, and levels II and III of groups of the 9th degree of accuracy according to GOST 24643.

2.15. The roughness parameter of the working surfaces of the levels should not be more than Ra 6.3 µm according to GOST 2789.

2.16. The movable block of levels should have a smooth ride without jamming.

2.17. Level bodies, except for working planes, must be coated with ML type enamels in accordance with GOST 9754 or GOST 12034 or have An.Ox nhr or An.Ox nv coating in accordance with GOST 9.306.

For levels certified for the first category of quality, it is allowed to apply coatings of other types on the hulls that meet the requirements of clause 2.18.

2.18. Paint coatings must be of light colors and comply with class IV according to GOST 9.032 and operating conditions according to group U1 GOST 9.104.

Oxide coatings must comply with GOST 9.301, operating conditions - group G in accordance with GOST 9.303.

2.19. After the adjustment of the ampoules, the heads of the set screws must be painted with a bright color of enamel, which differs from the color of the coating of the body.

The heads of the screws for fastening the rotary block of levels of the US5 type are not painted.

3. Acceptance rules

3.1. The levels must be accepted by the technical control of the manufacturer.

3.2. To verify that the levels comply with the requirements of this standard, the manufacturer shall carry out acceptance and periodic tests.

3.3. Acceptance and delivery of levels is carried out in batches.

3.4. When checking levels for compliance with the requirements of paragraphs. 1.2, 2.1 (in terms of compliance with the working drawings), 2.7, 2.9, 2.10, 2.12-2.15, two-stage control is used, for which levels are sampled in accordance with Table. 6.

If the number of defective levels in the first sample is greater than the acceptance number, but less than the rejection number, a second sample is taken.

Table 6

The volume of the batch of levels, pcs.	Stage of control	The volume of one sample, pcs.	The volume of two samples, pcs.	acceptance number	Rejection number

3.6. When checking levels for compliance with the requirements of paragraphs. 2.1 (in terms of compliance with standard samples), 2.5, 2.6, 2.11, 2.16-2.19, complete control is used.

3.7. When checking levels for compliance with the requirements of paragraphs. 2.4 and 2.2, periodic tests should be carried out at least once a year, for which 3% of the levels from the batch are selected, but not less than 5 levels that have passed acceptance tests.

If, when checking the selected levels, at least one level does not meet the requirements of paragraphs. 2.4 or 2.8, double the number of levels taken from the same lot should be retested.

The results of the level recheck are final.

4. Control methods

4.2. Continuous control for compliance with the requirements of paragraphs. 2.1, 2.5, 2.6, 2.11, 2.16-2.19 must be carried out visually - by comparison with a standard sample.

4.5. Checking levels for the effects of transport shaking (p. 2.8) should be carried out on a special stand.

4.7. The adhesion strength of the magnetic level to the metal surface (clause 2.12) is checked for 2 minutes.

4.9. The deviation from parallelism of the working surfaces of the levels of the US3, US4 and US6 types (clause 2.14) must be checked on a calibration plate of the 1st accuracy class according to GOST 10905 using an indicator head with a stand.

4.10. The control of the roughness of the working surfaces of the levels (clause 2.15) should be carried out with a profilometer or profilograph according to GOST 19300.

4.11. Protective coating control (clause 2.18) - according to GOST 9.302.

5. Marking, packaging, transportation and storage

5.1. At each level must be applied:

Trademark of the manufacturer;

Symbol;

Ampoule division price in millimeters per 1 m and in minutes;

Year of issue;

Price (when making a level for retail sale).

The method of applying markings must ensure their safety during the warranty period.

5.2. Preservation of levels - according to GOST 9.014 protection option - VZ-1, VZ-2, VZ-4, VZ-7, VZ-13 or VZ-15.

The cardboard case must be pasted over with a cloth or binding material with a nitrocellulose coating in accordance with GOST 8705.

5.4. The box should show:

Name or trademark of the manufacturer;

Level symbol.

5.5. Cases with levels should be packed in boxes.

The boxes inside must be lined with paper in accordance with GOST 9569, glassine in accordance with GOST 2697 or other waterproof material.

Other packaging is allowed, which ensures the safety of the levels from mechanical damage and moisture during transportation and storage.

Gross weight of boxes - no more than 30 kg.

5.6. Transport marking - according to GOST 14192.

5.7. Transportation and storage of levels - according to GOST 13762.

6. Manufacturer's Warranties

6.1. The manufacturer must ensure that the levels comply with the requirements of this standard, provided that the consumer observes the conditions for their transportation and storage.

GOST 9416-83 UDC 771.373:69:006.354 Group Zh36 STATE STANDARD OF THE UNION OF THE SSR Building levels Specifications Building levels. Specifications OKP 48 3300 Date of introduction 1985-01-01 INFORMATION DATA 1. DEVELOPED AND INTRODUCED by the Ministry of Construction, Road and Municipal Engineering DEVELOPERS AI. Polunin (topic leader), E.V. Zaitseva, N.I. Fedorov 2. APPROVED AND INTRODUCED BY Decree of the State Committee of the USSR for Construction of October 31, 1983 N 297 3. REPLACE GOST 9416-76 014-785.2 GOST 9.032-742.18GOST 9.104-792.18GOST 9.301-862.18GOST 9.302-884.11GOST 9.303-882.18GOST 166-892.17GOST 9.306-854.1GOST 427-754.1, 4.4GOST 1 583-892.3GOST 1761-922.3GOST 2386-732.5GOST 2697-835.5 GOST 2789-732.15GOST 4748-922.3GOST 4784-742.3GOST 8026-924.8GOST 8705-785.3GOST 9569-79 5.5GOST 9754-762.17GOST 10667-902.3GOST 10905-864.8, 4.9GOST 12034-772.17GOST 13762-865.7GOST 14192- 775.6GOST 15150-692.4GOST 17622-722.3GOST 19300-864.10GOST 21228-852.3GOST 21631-762.3GOST 24643-812.13; 2.14GOST 25347-821.4GOST 25349-881.4TU 2-034-225-874.8 5. REPUBLICATION. November 1993 This standard applies to building levels (hereinafter referred to as levels) intended to check the horizontal and vertical arrangement of the surfaces of elements of building structures, as well as to levels intended to transfer the angle of inclination of a structural part to similar parts in the production of construction and installation works without standardization of metrological characteristics. The technical level indicators established by this standard meet the requirements of the highest and first quality categories. 1. Types, main dimensions and parameters 1.1. Levels must be made of the following types, indicated in Table 1. 1.2. The main dimensions and weight of the levels must correspond to those indicated in Fig. 1-6 and in Table 2-4. The shape of the hull and windows of the levels are not established by the standard. 1.3. Levels of all types, with the exception of the US1 level, can be made with magnetic inserts (hereinafter referred to as magnetic levels) installed on one of the working planes. Table 1 Level group by accuracyLevel type Size IIIIII Ampoule division value mm/mminmm/mminmm/m 8US5-3US6-1; 41.2US6US6-2US6-3; 20.6US6-4 Type level US1 Weight - no more than 0.12 kg. 1 - body; 2 - ampoule; 3 - cover 1 Level type US2 Weight - no more than 0.24 kg. 1 - body; 2 - ampoule; 3 - cover; 4 - clip; 5 - protective glass Fig. 2 Level type US3 Weight - no more than 0.48 kg. 1 - body; 2 - ampoule; 3 - cover; 4 - protective glass Fig.3 Level type US4 1 - body; 2 - ampoule; 3 - cover; 4 - protective glass Fig.4 Level type US5 1 - body; 2 - ampoule; 3 - movable block; 4 - block fixed; 5 - protective glass Fig. 5 Level type US-6 1 - body; 2 - ampoule; 3 - block; 4 - protective glass Fig. 6 Table 2 Size L, mm Weight, kg, max US4-13000.50 US4-25000.65 Table 3 Weight, kg, max, level with housing ,52US5-36000.540.70 Table 4 Weight, kg, not more, level with casing Size L, mm made of cast profile Maximum deviations of the main dimensions of the levels and their parts must comply with: - for the landing dimensions of the rotary block - the 8th grade according to GOST 25347 and according to GOST 25349; - for free sizes of metal parts - the 14th grade according to GOST 25347; - for free sizes of plastic parts - the 14th grade according to GOST 25349; 1.5. Symbols for levels should consist of a type designation (US1-US3) or a standard size (US4-1, US4-2, US5-1 US5-3, US6-1 - US6-4), a group of levels and the designation of this standard. In the case of manufacturing levels with magnetic inserts, the letter "M" must be additionally indicated after the type designation. An example of symbolic designation of the level US5-1 size group II: US5-1-II GOST 9416-83 The same, magnetic level size US5-2 group I: US5M-2-I GOST 9416-83 2. Technical requirements 2.1. Levels must be manufactured in accordance with the requirements of this standard according to working drawings and standard samples. Reference samples must be agreed with the basic standardization organization and approved in the prescribed manner. 2.2. For magnetic levels, a magnetic insert must be used, manufactured according to technical documentation approved in the prescribed manner. 2.3. Details of the levels must be made of the materials indicated in Table 5. Table 5 Part name Material for levels of types US1US2US3US4US5US6 Housing Aluminum alloys according to GOST 1583 or aluminum alloys grades AD 31, 1915 according to GOST 4784 personal), manufactured according to technical documentation approved in the prescribed manner Protective glass - Organic structural glass according to GOST 10667 or technical organic glass grades TOSP or TOSN according to GOST 17622, or grade A celluloid, transparent, white, polished on both sides according to GOST 21228, or polystyrene produced according to the technical documentation approved in the prescribed manner Clip-tape made of silicon-manganese bronze with a thickness of 0.6 mm, normal accuracy according to GOST 4748 or a tape made of tin-phosphor bronze grade BrOF6.5-0.15 with a thickness of 0.6 mm according to GOST 1761 - Note. Other materials may be used provided that the technical requirements established by this standard are met. 2.4. Levels must be manufactured in climatic modification U, placement category 1 in accordance with GOST 15150 for operation at temperatures from minus 40 to plus 40 C. 2.5. For the manufacture of levels, low-precision ampoules of the ADC type, version N according to GOST 2386 or ampoules made according to technical documentation approved in the prescribed manner should be used. The price of dividing the ampoule, depending on the group of levels, should correspond to that indicated in Table 1. When using bent ampoules, the length of the largest stroke should be at least 0.4 of the circumference of the ampoule tube, but not more than half of it. When using cylindrical straight ampoules, the strokes can be annular. 2.6. Ampoule filler should be tinted pink, yellow-green or other light colors. 2.7. Ampoule scales should be located symmetrically about the axis of the corresponding cutouts in the covers or protrusions in the level blocks. The symmetry tolerance of the scales is 1.5 mm. 2.8. The levels in the package must withstand transport shaking with an acceleration of 30 m/s_2 and a frequency of 80-120 beats per minute. 2.9. The deviation of the air bubble in the ampoule from the average position, determined by the distance between the largest strokes, at a temperature of plus (203) C after setting the level to a horizontal (or vertical) plane should not exceed 1/4 of the scale division. In this case, the horizontal and vertical planes must be set with an accuracy not exceeding 0.2 of the maximum permissible error of the level ampoules. 2.10. When the level is rotated around the axis of the ampoule by 5 30 in both directions from its middle position, the deviation of the bubble should not exceed 1/2 of the scale division. 2.11. Levels, with the exception of levels of types US1, US2 and US5, must have two working planes. 2.12. Magnetic levels installed in their working position on a vertical unpainted metal surface must withstand a static load equal to 0.2 of the mass of the level applied in the direction of the longitudinal axis of the level. Moving the level under its own weight on a metal surface is not allowed. 2.13. The flatness tolerance of the working surfaces of the hulls of levels of group I must correspond to the 10th degree of accuracy, and levels II and III - to the 11th degree of accuracy according to GOST 24643. For levels certified according to the highest quality category, the flatness tolerance of the working surfaces of hulls of levels of group I must correspond 9th degree of accuracy, and levels of groups II and III 10th degree of accuracy according to GOST 24643. 2.14. The tolerance of parallelism of the working surfaces of the hulls of levels I of the group must correspond to the 9th degree of accuracy, and the levels of II and III groups - the 10th degree of accuracy in accordance with GOST 24643. correspond to the 8th degree of accuracy, and levels II and III of the group to the 9th degree of accuracy according to GOST 24643. 2.15. The roughness parameter of the working surfaces of the levels should not exceed Ra 6.3 µm according to GOST 2789. 2.16. The movable block of levels should have a smooth ride without jamming. 2.17. Level bodies, except for working planes, must be coated with ML type enamels in accordance with GOST 9754 or GOST 12034 or have An.Ox nhr or An.Ox nv coating in accordance with GOST 9.306. For levels certified for the first category of quality, it is allowed to apply coatings of other types on the hulls that meet the requirements of clause 2.18. 2.18. Paint coatings must be of light colors and comply with class IV according to GOST 9.032 and operating conditions according to group U1 GOST 9.104. Oxide coatings must comply with GOST 9.301, operating conditions - group G in accordance with GOST 9.303. 2.19. After the adjustment of the ampoules, the heads of the set screws must be painted with a bright color of enamel, which differs from the color of the coating of the body. The heads of the screws for fastening the rotary block of levels of the US5 type are not painted. 3. Acceptance rules 3.1. The levels must be accepted by the technical control of the manufacturer. 3.2. To verify that the levels comply with the requirements of this standard, the manufacturer shall carry out acceptance and periodic tests. 3.3. Acceptance and delivery of levels is carried out in batches. The batch must consist of levels of the same group, of the same type or size, made from the same materials, processed according to the same technological process and simultaneously presented for acceptance according to one document. 3.4. When checking levels for compliance with the requirements of paragraphs 1.2, 2.1 (in terms of compliance with working drawings), 2.7, 2.9, 2.10, 2.12-2.15, a two-stage control is used, for which a sample of levels is made in accordance with Table 6. 3.5. A batch of levels is accepted if the number of defective levels in the first sample is less than or equal to the acceptance number, and rejected without assigning a second sample if the number of defective levels is greater than or equal to the rejection number. If the number of defective levels in the first sample is greater than the acceptance number, but less than the rejection number, a second sample is taken. Table 6 Volume of the batch of levels, pcs. Control stage Volume of one sample, pcs. Volume of two samples, pcs. Acceptance number -1200First5010037Second5089 A batch of levels is accepted if the number of defective levels in two samples is less than or equal to the acceptance number , and reject if the number of defective levels in two samples is greater than or equal to the rejection number. 3.6. When checking levels for compliance with the requirements of paragraphs 2.1 (in terms of compliance with standard samples), 2.5, 2.6, 2.11, 2.16-2.19, complete control is used. 3.7. When checking the levels for compliance with the requirements of clauses 2.4 and 2.2, periodic tests should be carried out at least once a year, for which 3% of the levels from the batch are selected, but not less than 5 levels that have passed acceptance tests. If, when checking the selected levels, at least one level does not meet the requirements of paragraphs 2.4 or 2.8, repeated tests should be carried out with twice the number of levels selected from the same lot. The results of the level recheck are final. 4. Control methods 4.1. The dimensions of the levels must be checked using a metal ruler with a division value of 1 mm in accordance with GOST 427 or a vernier caliper with a division value of 0.05 or 0.1 mm in accordance with GOST 166. 4.2. Complete control for compliance with the requirements of paragraphs 2.1, 2.5, 2.6, 2.11, 2.16-2.19 must be carried out visually - by comparison with a standard sample. 4.3. To carry out climatic tests (clause 2.4), the levels are placed in a refrigerating chamber, the temperature in the chamber is lowered to minus (403) C and kept at this temperature for 2 hours. Then the temperature in the chamber is increased to (203) C, the levels are removed from cameras and check them for compliance with paragraphs 2.9 and 2.10. After that, the levels are placed in the heating chamber, the temperature is raised to (403) C and maintained at this temperature for 2 hours. Then the temperature in the chamber is lowered to (203) C, the levels are removed from the chamber and checked for compliance with paragraphs 2.9 and 2.10. 4.4. Checking the levels for compliance with clause 2.7 should be carried out with a metal ruler in accordance with GOST 427 by measuring the distance from the largest stroke of the ampoule to the protrusion of the block or window in the cover of the level housing. 4.5. Checking the levels for the effects of transport shaking (p. 2.8) should be carried out on a special stand. The packed levels are attached to the platform of the test bench without additional external shock absorption, subjected to shaking for 2 hours, and then checked for compliance with the requirements of paragraphs. 2.9 and 2.10. 4.6. Checking the levels for compliance with the requirements of clause 2.9 should be carried out on a calibration plate, and according to clause 2.10 - on a calibration plate and using a special device. 4.7. The adhesion strength of the magnetic level to the metal surface (clause 2.12) is checked for 2 minutes. 4.8. The deviation from the flatness of the working surfaces of the levels (clause 2.13) should be checked on a calibration plate of the 1st accuracy class according to GOST 10905 using a ruler of the 1st accuracy class according to GOST 8026 and probes from the N1 or 2 set according to TU 2-034-225. 4.9. The deviation from the parallelism of the working surfaces of the levels of the US3, US4 and US6 types (clause 2.14) must be checked on a calibration plate of the 1st accuracy class according to GOST 10905 using an indicator head with a stand. 4.10. The control of the roughness of the working surfaces of the levels (clause 2.15) must be carried out with a profilometer or profilograph according to GOST 19300. 4.11. Protective coating control (clause 2.18) - according to GOST 9.302. 5. Marking, packaging, transportation and storage 5.1. At each level, the following must be applied: - trademark of the manufacturer; - symbol; - the price of dividing the ampoule in millimeters per 1 m and in minutes; - year of issue; - price (when manufacturing a level for retail sale). The method of applying markings must ensure their safety during the warranty period. 5.2. Preservation of levels - according to GOST 9.014 protection option - VZ-1, VZ-2, VZ-4, VZ-7, VZ-13 or VZ-15. 5.3. Each level, together with a passport in accordance with GOST 2.601 and an instruction manual, must be packed in a wooden, cardboard, plastic or artificial leather case. The level must not fall out of the case when it is turned over when closed. The cardboard case must be pasted over with a cloth or binding material with a nitrocellulose coating in accordance with GOST 8705. 5.4. On the case must be indicated: - the name or trademark of the manufacturer; - symbol of the level. 5.5. Cases with levels should be packed in boxes. The boxes inside must be lined with paper in accordance with GOST 9569, glassine in accordance with GOST 2697 or other waterproof material. Other packaging is allowed, which ensures the safety of the levels from mechanical damage and moisture during transportation and storage. Gross weight of boxes - no more than 30 kg. 5.6. Transport marking - in accordance with GOST 14192. 5.7. Transportation and storage of levels - according to GOST 13762. 6. Manufacturer's warranties 6.1. The manufacturer must ensure that the levels comply with the requirements of this standard, provided that the consumer observes the conditions for their transportation and storage. 6.2. The warranty period for the operation of the levels is 12 months from the date of sale through the distribution network, and for deliveries for off-market consumption - from the date of receipt by the consumer, but not more than 1.5 years from the date of their manufacture.