JJG 540-1988 Trial Verification Procedure for Working Liquid Pressure Gauges JJG540-1988 Standard download decompression password: www.bzxz.net
This procedure is applicable to the verification of working liquid pressure gauges that are newly manufactured, in use and after repair.

Trial Verification Procedure of Tignid Manameter for Working
.I.IG540—1988
Trial Verification Procedure of Tignid Manameter for Working
JJC 540--[988
--++ 2+
This verification procedure was approved by the National Metrology Bureau on March 21, 1988, and was implemented from January 1, 1988. Responsible unit: Shanghai Standard Measurement and Design Administration Drafting unit: Shanghai Measurement and Design Technology Research Institute The technical provisions of this regulation shall be directly interpreted and compiled by the drafting unit, and the main drafter of this regulation:
Zhu Yexing (Shanghai Measurement and Design Technology Research Institute) 7152
Technical requirements
Verification plan
Verification items and verification methods
Verification station Results processing and verification period
1 Function of this regulation Verification record requirements for pressure gauges
Appendix 2 Instrument pressure gauge instructions
Trial verification procedure for working filter pressure gauges This regulation is used for the manufacturing and repair of working filter pressure gauges (hereinafter referred to as instruments) and the standard type is seven types, two types of non-type. 1. Technical requirements
The upper limit of the instrument, the graduation value and the instrument number shall meet the requirements: Table 1 www.bzxz.net
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Method, according to the modification
2. The instrument parts shall be complete, and the mechanical and gas connections shall be solid and well matched, and there shall be no external defects or damage.
Testing technology requirements for glass tubes
3.1 The light transmittance of the measuring glass tube shall not be uneven, and there shall be no defects that affect the reading or temperature. 1.2 The inner and outer diameters of the measuring glass tubes shall be uniform, without bending: 3.3 The inner and outer shapes of the tubes shall be light-resistant, and the liquid shall be visible: 4. The scale shall be water-resistant
5. 1. The scale should be half-marked and neat, and the degree or point should be correct, without any breakage, and the center of the measuring tube should be correct.
4.2 The scale lines, numbers and positions should be neatly arranged, clear and accurate, economical and durable, 4.3 The original value of each minute should be marked - short system: every 5 scales should be marked at the bottom: the middle line should be marked: every 5 scales should be marked at the bottom: the long line should be marked at the bottom: the width of the line should not be more than 0.3m4.4 The scale should be marked according to the gravity acceleration of 9.80m/, and the density of the work wave 201 should be marked: the same structure should be used to correct the scale as a container. The bottom should be reduced by a convenient pressure material: gold or other hard materials that can be used as a heart-shaped material, and the table should be flat 5
6 type instrument The point is equipped with a level and a water level adjustment device. The instrument name, model, number, core grade, maximum working capacity, factory ex-factory date, and manufacturer or time standard shall be marked on the control point. The accuracy of the instrument shall meet the following requirements: 8.1 "7 When the working liquid is water: the accuracy grade and allowable basic error of the instrument shall be determined by the instrument design; 11 When the working liquid is mercury, the accuracy grade and allowable basic error of the instrument shall be determined by the instrument design; 9 The position change efficiency shall meet the following requirements:
9.1 When the working liquid is water, the total value of multiple position changes shall be calculated as 4. 9.2
When the working liquid is mercury, the zero change efficiency shall be calculated as 5. 1154
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The cup-shaped position is in the case of 2 abandonment rates, and it lasts for 10nm without leakage. The calibration parts are allowed to be absolutely different from the absolute value of the groove. The sound is not loud. The receiver is filled with the absolute value of the immersion benefit 13: Calibration equipment
Overflow meter (measurement range, graduation value 1:
Guarantee the increase or stimulation of the pressure generator (create a pressure flow or other gas source): repeatedly, four-way digging head, glue & each and seconds requirements: technical secret pressure gauge (accuracy level not less than U.4) only when the instrument is timing should comply with the following conditions
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The instrument is a pure system or frequency water, the instrument is filled with a working liquid, reduced in Rewrite h under the calibration temperature, it is feasible to increase the vertical breath of the instrument, the instrument is empty and level, the instrument is fully loaded with water. The calibration process is not affected by the user and the reading of the indication value. Three calibration items and calibration methods
Outside the implementer
This fee is the capital 1-7 provisions of the memory measurement times, 15
Capital sealing products
Simple type instrument specification retention time calibration, when filled with working liquid, use four avoidance joints and stocks and connect its two ends with the pressure source and the meter (as shown in the sequence! : Then press the piece to [2 times the maximum working force, close the valve: keep Immi, now observe 5min later, the pressure indication pin should remain unchanged, 16 center value calibration
16.1 Calibration of the instrument indication value, to use the standard hysteresis to compare with the donation The method is used for verification. 1ts:
16.2 Before verification, the liquid or residual gas in the instrument is allowed to be excluded: repeatedly pressurize the filter point upper limit several times, use the force method of adding and subtracting the working liquid to make the instrument indication extend to the limit,
%3 Connect the two ends of the four pipes with rubber tubes to the standard instrument and the inspection instrument interface respectively, check the displacement of the standard solution and the instrument being tested, and then connect the two ends of the four pipes with a valve and the force generator, and connect them to the regulator as a whole,
164 The given points should be no less than 5, and the numbers should be distributed on the whole. 16.5 During verification, uniformly press to the limit: then check according to the original verification point sequence, the minimum difference between the positive and negative strokes of each point should not be greater than the standard error, and the error is calculated using the following formula: Where: force
indication error ( Fa or kPL):
Indication value of the instrument under test (I or ka);
Indication value of the standard instrument (Pu or kPa).
Zero position change calibration
All parts can be installed in the figure
1-4 table: 2-4 suitable head, 7-7: 4 type:
Double + source
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After the minimum value calibration, the instrument is connected to the atmosphere, and the zero position indication and the calibration piece position indication are in accordance with the prohibition (for U-type, only the left tube or the free tube are used), and the zero position change should comply with the provisions of Article 9. Four calibration result processing and calibration cycle
18 Only those who meet the requirements of this regulation after calibration will be issued a calibration certificate: for unqualified instruments, the calibration result certificate will be issued. The instrument and calibration cycle can be up to two years.
Appendix 1 Calibration record of working liquid pressure gauge Tester number
Test submission form
Manufacturer;
Accuracy level
Instrument tightness
Allowed opening value
Standard instrument number
Accuracy level
Standard indication estimate
Treatment result
Calibrator
Appendix 2 Instructions for use of instrument
1 Only with calibration certificate can it be used? The instrument should be used in an environment below -30℃. If it is not used in an area with high temperature and high acceleration, it is necessary to make a small measurement. 3. Pay attention to the measuring range and the maximum working force of the instrument to prevent the working body from rushing out of the glass and damaging the instrument.
1. Keep the inner and outer walls of the measuring tube and the working body clean. When not in use, the tube should be closed! 1. In order to avoid affecting the accurate indication, the instrument should be used without any concentration. 5. After the instrument is used, the air accumulated in the concentrated body should be fully removed. 6. The instrument should be calibrated to zero position when in use.
The reading of the instrument should be read at the intersection of the scale scale and the inner surface. The reading of the instrument should be read at the intersection of the scale scale scale and the inner surface.
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