Verification Regulation of the Record Pressure Gauge Pressure Vacuum Gauge and Vacuum Gauge
Some standard content:
Verification Regulation for Recording Pressure Gauge, Pressure Vacuum Gauge and Vacuum Gauge JJG926—1997 Verification Regulation for Recording Pressure Gauge, Pressure Vacuum Gauge and Vacuum Gauge JG 926—1997 This set of regulations was approved by the State Technical Supervision Bureau in January 1997 and was started on May 1, 1998. Responsible unit: Shanghai Technical Supervision Bureau Drafting unit: Shanghai Municipal Testing Institute The main drafter of this regulation is: Shanghai Testing Institute (Shanghai Testing Institute) Shanghai Institute of Measuring and Testing! Gong Jiarong (Shanghai Institute of Measuring and Testing Technology)
Participating Drafter:
Kuan Di (Shanghai Institute of Measuring and Testing Technology
Technical Requirements
Testing Conditions
Testing Items and Test Methods
Type and Period of Test Results
Appendix 1 Recording Pressure Gauge: Pressure and Vacuum Gauge Test Record 2 Verification Record Card Back Format [—]
Verification Book Back Format [II]
Verification Procedure for Recording Pressure Gauge, Pressure Vacuum Gauge and Vacuum Gauge This procedure applies to newly manufactured, used and repaired recording pressure gauges, pressure vacuum gauges and vacuum gauges (hereinafter referred to as pressure gauges) with a measuring range of -0.1 to 250MI and only glass components. Calibration. The pressure gauge is used to measure and record the value of the pressure gauge. 1. Prototype: The elastic component produces elastic deformation under the action of pressure, and the recording pen is moved through the mechanical transmission mechanism. The value of the force is recorded on the moving recording paper. The recording plate is divided into units. The moving mechanism is a clock mechanism and a motor. There are three types of
pressure gauges: single-channel pressure gauge, double-channel pressure gauge, and strip-type pressure gauge. The pressure gauge can record one or more pressures. 2. Technical requirements
1. Single pressure gauge: (Pinska, one multiple of the unit 2. The upper limit of the pressure gauge series: [×10\, t.6×10\, 2.5×10\, 4, 10\, 6*10%. Only, negative integer or zero.
3 The sweeping time of a moving ring is: 1, 2, 4, 0, 8, [2, 24, [6H% 4 The parts of the gauge are firmly matched, and no movement is required. 5 The nameplate of the pressure gauge is clearly marked with the following marks: "Manufacturer" name or trademark:
Pressure gauge model and specifications;
Accuracy level:
Factory number, production year and month:
Special-shaped synchronous motor The multi-channel recorder of pressure and frequency is marked with the recorder, 7 Recording paper
7.1 The recording paper is marked with:
Pressure, time and blood line: Manufacturer name ：
The pressure gauge or vacuum gauge used shall have a negative mark. 7.2 Pressure graduations
7.2.1 The graduation values shall be selected from the following series: 110, 2×10\, 510″, where n is the total value, negative integer. 7.2.2 The distance between the dividing lines shall not be less than 1mm: 7,1.3 The markings shall be at least 4 times the dividing line. 7.2.4 The width of the dividing line shall not be greater than [/5.1194] between the dividing lines. 7.3 Time dividing lines
7.3.1 The time division shall be selected from the following series: 1, 2, 5, 10. 15. 30, 60, 120. rim
. 3.2 The thickness of the pressure gauge on the table shall not be greater than 1/3 of the dividing line. .4 The recording paper should not be rolled out, deflected, creased or broken during operation. The recording pen should be adjusted to the required device. The device should not produce any errors during the recording process, and the recording should not be stuck or stuck.
8.2 The recording line should be continuous and the total width should not exceed 0.5. The width change within the full length range should not exceed 0.1mm.
8.1 When the recording sheet is in the stopped state, the length of the recording line should not exceed the time line! 0.5mm,"pressure! The old accuracy grade and allowable error are known as 1*1
allowable error (in percentage of the field;
produced in Nansu
city: use the grade pressure of the private platform allowable error certificate to make careful calculation period, allow more to help record, 10 the pressure gauge process error is not worth the overcharge allowable reading error absolute value, 11
is the small table time no error: 24h-5mim
12 calibration equipment
12.1 standard instrument
second, standard piston pressure gauge:
second, third standard leak-tight pressure gauge: first, third soft liquid type gauge
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elastic precision pressure gauge, precision vacuum gauge: other same wash confirmed pressure standard gauge (1.4) The absolute value of the allowable error of the standard instrument should not exceed the allowable error of the pressure gauge: 1/4, 12.2 Other equipment: Positive pressure calibrator; Gas pressure source and point air pump: Timer (24±Irin). Environmental conditions during calibration: 13. [Temperature: See Table 2. Physical level: 0.40.0:1.6:1.5). 2., - Standard value: 13.2 Relative humidity: 13.3 Convection of cabinet should not exceed 10%. 13.3 Humidity: 86-10 61Pac
14T as medium
4! For pressure gauges with a basic upper limit of no more than 0.25M, 1. The medium is other gases or non-toxic, light-polluting, chemically sensitive gases:
14.2 For pressure gauges with a measuring upper limit greater than 0.25M[, T as medium is non-ionizing liquid: 14.3 For pressure gauges with a measuring upper limit greater than 0.25M[, T as medium is non-ionizing liquid: 14.3 For pressure gauges with a measuring upper limit greater than 0.25M[, 0.4, 0.6 level pressure gauges, gas is used as medium. 15 For industrial pressure gauges, it can be calibrated only when it is placed under the environmental conditions of the 13th level. 4. Verification items and verification methods
16 External inspection
Daily inspection shall comply with the provisions of Article 17 of this regulation, 17 indication determination
1.1 When the pressure gauge is in the working position and no positive force is applied (when it is empty), the recording pen should be adjusted to the same value. 17.2 (.25), 0.4 and 0.6 pressure gauges, the indication verification should be not less than 10 points (including zero value), and the verification points should be evenly distributed on the scale plate: 1, 1.6 (1.5), 2.5 and 4 pressure gauges should be calibrated according to the scale line marked with valid numbers (including zero value). 17.3 The pressure part of the pressure vacuum gauge should be calibrated according to the scale line marked with numbers. The vacuum part of the pressure gauge: when the upper limit of measurement is not more than 0.15MPa, calibrate 2-3 points; when the upper limit of measurement is less than 0.15MPa, the recording pen should be moved to the vacuum part. 17.4 The pressure gauge should be calibrated according to the atmospheric pressure of the area. 17.5 When performing the pressure and pressure reduction indication verification, the recording pen shall not have a return phenomenon. 17.6 For 0.25, 0.4 and 0.6 digital pressure gauges, perform two times of rising and falling positive indication verification, and for 1, 1.6 (1.5), 2.5 and 4 level pressure gauges, perform one time of rising and falling positive indication verification. 17. When performing the indication verification, check whether the recording pen and the recording line meet the provisions of Article 8 of this regulation. 17.8. Indication error verification
During the verification, start from the equal value and steadily increase the pressure (sparse room), compare the indication of the standard instrument point by point according to the specified verification points, wait for the pressure, and read the indication by hitting the stabilization plate. Follow this method until the measurement limit is reached. After measuring at the limit for 3 minutes, perform positive verification at the original verification point until the zero value. The indication error of each verification point during the increase and decrease of pressure shall meet the requirements of Article 10.
The indication error is calculated according to formula (1):
Wherein:
The indication error of each calibration point:
Force—the indication of each calibration point:
Human—the indication of the pressure gauge at each calibration point. 17.9 The same-path error verification
The return error verification and the small weight error verification are carried out in parallel. In each verification, the indication of the rising and falling points at the same calibration point is 1196
and all meet the requirements of Article 11.
1.10 The upper limit value of the verification using only a piston dynamometer as a standard instrument is not large.MP. The table should be at the same level as the free end of the element pressure gauge. Otherwise, the pressure value caused by the difference in liquid rod should be corrected. The correction value is calculated by the formula (2):
Where: A—·Le is the correction value, Pa;
Density of the medium: m:
The average force at the place of use, m/s,
The distance between the lower end of the pressure gauge and the elastic body of the element pressure gauge: E
When the elastic body of the element pressure gauge is directly connected to the end of the element pressure gauge, the positive value should be corrected by adding the corresponding amount of pressure on the plate:
18 Output value verification qualified piece, select the walking eating agreement within the gold set, verification method: open the pressure to the measured value of about 5% (bar or The table-shaped recording paper can be placed under pressure), the timing mechanism is started, and the recording pen and the time recorder are recorded. After the time is 1 cycle, the running time error becomes the requirement of Article 12. Processing of verification results and verification cycle
The pressure gauge that meets the requirements of this period of technical room after verification shall be issued with a verification certificate (see Appendix 2, Appendix 3); the pressure gauge that fails the verification shall be issued with a verification result notice. The H small meter in use shall be qualified after verification and shall be marked as qualified. A pressure gauge of the same accuracy grade is allowed to be downgraded for use, and the accuracy grade mark must be collected. The verification cycle of the pressure gauge can be determined according to the usage, and is usually "years. The 1, 1.6 (1.5, 2.5) pressure gauges that are subject to mandatory verification shall be issued with a verification result notice. For the pressure gauge of level 4, its aging period shall not exceed half a year. Appendix 1: Inspection record sheet for recording pressure gauge, pressure altimeter and vacuum gauge. Inspection unit: Tidal volume interval: Appearance inspection: Recording absolute stability: Time error: Unique indication position: European calibration: Pressure gauge name: 1. Accuracy: Manufacturer name: - Recording age and time error: Timing: Working medium: Inspection key: Local certification: Water level identification: Minimum: Qualification result: Calibrator: H period
Calibration degree
Allowable value
Positive small record and time load deviation
Measured value
Calculated value
Timing tolerance
Measured value
Allowable error
Standardized value
Certificate number 2.
, Verifier
Calibration temperature
Calibration certificate front format (I)
(0.6, 0.4, 1.25 level)
, Calibration personnel
MPa, Recording pen flatness
Small front test result MP
Appendix 3
Calibration certificate back format [II]
1. 1.6, (1.5), 2.5. 4 Level 1
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