Some standard content:
Third-class standard liquid pressure gauge
Verification procedures
(Trial)
JJG 2A1
Verification procedures for second and third-class standard liquid pressure gauges (Trial)YerlficationKcgulatimof1.quidManometer(CradeI&Ⅲ)
JG 241-1981
This verification procedure was approved by the General Administration of Metrology of China on April 2, 1981: May 1, 1982. The responsible unit is: China National Institute of Metrology. The drafting unit is: China National Institute of Metrology. The main drafter is: Rongshan
This regulation is interpreted according to the technical provisions. 11.3
1. The classification of instrument measurement limits, accuracy level and verification equipment, verification
1. Treatment of verification results
Appendix 1
Appendix 2 3. Verification certificate of third-class standard liquid pressure gauge: book format
Verification procedures for third-class standard liquid pressure gauge
This document is applicable to newly manufactured and repaired second- and third-class standard liquid pressure gauges! (The following is a brief description of the instrument.
1. Classification, grades and verification equipment of the upper limit of measurement of memory instruments. According to the upper limit of measurement of the instrument, the instrument accuracy grade and the type of instrument are shown in Table 1. Temperature most often
Free start-up
+0.30= 5t.153
Year position: rma,
1030 -20:
14. 2 +,*1. Format s
-3.6f: ± ×.15%
2: The international currency representing the yuan point is the unit: the water is the proposal of the intermediary, and the price is set according to the two-step Sichuan unit, gzhou skin, our town (H center) private
: 224: IP5
2 Calibration equipment
2.1 Environmental instruments:
·First-class standard active pressure gauge or first-class standard pressure gauge: first-class standard piston pressure gauge or second-class standard liquid pressure gauge. 2.2 Other equipment: gas recorder, meteorologist, thermometer, gas stop gauge, etc. 2. Calibration
3: Qualification conditions for skin business items
31 The calibration of the slow device must be carried out with a chain detector of a grade, the upper limit of the measurement item is classified according to the corresponding standard and the voucher is used. Comparative calibration
3.2 Instrument working medium: pure water or hot water, 3.3 Ambient temperature: second-class instruments are calibrated at 215t, degree of fatigue/trend = 1T: first-class instruments can be calibrated at 20 ± 10 seconds, degree of fatigue/trend cannot exceed +, 3.4 After the instrument is filled with working medium, the accumulated gas in the working medium must be fully eliminated, 3.5 After one hour at a temperature lower than the test temperature, the calibration is carried out as follows: 4 External inspection
+, 1 Only the name of each instrument, instrument number, accuracy grade, upper limit of measurement, manufacturing" and factory date should be marked on the surface. 4.2 The appearance of the instrument shall not have any evidence of quality damage. In addition to meeting the requirements of the regulations, newly manufactured instruments must also meet the requirements of relevant technical standards.
4.3 Only instruments equipped with inspection (calibration) and level adjustment indicators shall have a first-class instrument with a width and length calibration error of no more than 20 mm after the instrument is leveled; third-class instruments shall have a scale element calibration error of no more than 0.02 mm; the straightness of the glass tube shall not affect the effectiveness of the instrument;
4.4 New measuring instruments and scales shall have a length calibration certificate; second-class instrument scales shall have a calibration error of no more than 0.02 mm for the full length and any two scale lines; first-class instrument scales shall have a calibration error of no more than +0.1 mm for the full length and any two scale lines; 4.5 For cup-type instruments, the calibration error shall not exceed +0.1 mm for the full length and any two scale lines; Container: Position correction, with the number of installed tube and instrument ratio attached.
4.6 The instrument is accompanied by instruction manual and calibration certificate (factory certificate 1) Leakage check
Generate a pressure signal equal to the upper limit of the volume in the system of the instrument, close all the pressure source doors, keep for 10 minutes, if it remains unchanged after 5 minutes, it is considered that the instrument needs to be inspected. 6 Zero alignment error
6.1 Zero alignment error: Adjust the instrument and parts with water, add or change; move the working medium in the tube, and then push the bed or slack it, and make the alignment reading. If the money is sent back three times, the maximum reading of the part is beyond the provisions of Table 2,
Season position error: small value regret is exhausted, Li Bei reading person obtains the length of Table 2 provisions Table 2
Xianju Pingshe University
Hu Limited Company
Do not double the inspection
. The instrument's stable point should not be less, and it should be evenly distributed over the entire range of units: [e()
Luug-2(nc
7,2When the pressure is small, it is carried out point by point in turn. The second-class instrument is connected to a few music, and the pressure is reduced for two small careful readings: the first-class instrument is connected to a few music, and the pressure is reduced for...-you indicate the reading. If the indicated reading has a gap, it can be used for home effect. 7.3 When the instrument is used as a charging point, it must also be clearly verified. The allowable basic error is based on the three limits of the instrument's force measurement. It should meet the requirements of Table 1:
7 .4 Correction of the value:
7.4, the indication of each calibration point of the instrument shall be subject to temperature, acceleration and pressure change. The correction formula for positive pressure of the type positioner is:
The correction formula for negative pressure (sulfur) is:
For the cup type positioner
The stop pressure formula is:
The negative (sulfur) correction formula is:
he-e-Pea.||t t|| City: Positive condition: source
ring type actuator
: source: source
The height of the instrument pressure point (mH/mHO) from the zero position is the height of the instrument pressure point (u) When the standard instrument pressure point is above the zero position, H takes the old value, that is, H> When the standard instrument pressure point is below the zero position, take the old value, that is, H<. F
980.565 (e
Working medium fire record E, take 13.5951 [g/am), when the working medium is water, take 1 (g/cu): calibration (use) overflow, the solution of the second working medium (or water) and (g/m): calibration (use) place gravity acceleration (cm/2): H. 1. Maximum pressure value during calibration (when the working medium is water, the value is taken in mm2/mm3; when the working medium is water, the value is taken in mnH):
Air density value during calibration (grm, see Appendix 1: Only the calibration point (water discharge) indication (mr1) 7,4.2 cup type instrument number, the scale scale is not corrected before the container is cut off, and the indication readings of each calibration point must be corrected. The correction formula is as follows:
etc. 11 yuan indication 1m?:
Wu Zhongyi
Technical static correct indication 1 mntn):
The ratio of the cross-sectional area of the glass tube to the cross-sectional area of the container, Srm:
.5The sum of the indicated values of each calibration point of the instrument after correction and the indicated values of the standard instrument shall not exceed the allowable technical error specified in Table 1.
III. Handling of calibration results
8 Any instrument that meets the requirements of this regulation can be considered qualified and issued a calibration report. 9
For those that do not meet the requirements, a notice of results will be issued, and handling suggestions will be made as much as possible. The calibration period of the instrument is generally two years.
Appendix 1
At room temperature, the density of water is obtained by the following formula: o = pul1 - 20
Formula: e2——Take 13.5454 (r/em:); Take 1.8×10-（-)
2 The driving gas density value at the time of calibration is calculated according to the following text: =1.58
Where:——The maximum positive value during calibration, in units of certificate 3 The instantaneous Tober table of pure mercury in standard atmosphere to.r
13 592h
(g/em))
11 4823
13 479
13 4771
(p table)
Density value table of water in standard atmosphere
008070
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0 69720
A(gid)
The upper limit of the measurement range of the second-class instrument is 300-SMhrrHg (H()) The allowable pressure is divided by the error table
10 112
The upper limit of the measurement range of the second-class instrument is 1000~2000mmHg (HO) The allowable pressure of this error table is
(mimm)
.: 0.221
± (1.254
.0.231
.0.114
=n 292
=n,331
-G 314
tiust?
+ il..36x
1 3 3,=
+# 383
+ 0 398
- 0 431
=n v57
· 0 48
- 1,46 )
10 473
± 1.4F.5
·0491
- fn, 5hk.
. c.5T2
- 11,35
.0.023
-41. 5.3.5
.0.650
- 1: 5*4
I 737||tt| |±1 745
- n 235
=0:123
1: The allowable basic error of the instrument type is 300~8U0)mmFx（H,0）pressure gauge force
±(0.34 .5
±:1.4h:5
15,481
1U0,65:
+0 E93
= ti. Tes
= 0,93:
The upper limit of the third-class instrument is 10001--200murHg (H,O) The allowable basic error table of the pressure
= R,631
141 . 74:5
- ,735
1 ah. 7511
= I: HXI
. t.1F21
± 265
±,.569
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