Some standard content:
Verification Regulation of Second and Third Grade Standard Piston Gauges JJG 59-1990
Verification Regulation of Second and Third Grade Standard Piston Gauges [Grade & ㎡]
JTG 39:-1990
Recommended by IL: 59—14%
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This regulation was approved by the State Technical Supervision Bureau on January 26, 1900, and will be implemented from January 1, 2012. Responsible unit: Chinese Academy of Metrology
Drafting unit: Chinese Academy of Sciences
The drafting unit is responsible for the technical provisions of this regulation. The main drafter of this regulation:
Ministry of Industry and Information Technology (China Metrology Research Institute) Participating drafter:
Yu Ji (National Institute of Metrology)
Complete with [China Metrology Research Institute] 2084
Technical requirements
According to the specified conditions
Four Verification items and methods
Verification results and period of verification
Appendix [
Appendix 2
Quality and allowable error of special calibration code
Quality calculation formula of 5~250MPs positive force gauge manufactured according to national standard (GB6863-1986) Appendix 3 Gravity acceleration of major cities (! Time record 4
, third-class standard piston pressure gauge verification record Appendix 5 Verification certificate format
Instructions for use
Verification procedure for third-class standard piston pressure gauge This procedure is applicable to new manufacturing, so that the pressure measurement blood limit after neutralization is 1,6- 25[M second grade (0.05 grade!, first grade (0.2 grade! standard case I pressure (hereinafter referred to as micro pressure) test. Description
positive force gauge is a pressure measuring instrument that uses the principle of balancing the vertical force of the force on the weight of the weight. It mainly produces calibration instruments, work pot systems, special weights and other components, used for value transfer, verification, and marking force gauge single instrument (meaning table):
second technical requirements
the accuracy of the wide range of factors and the provisions of the table of non-essential errors! Table
accuracy
when the value of the two quantities is less than 10% of the quality value
measure straight 1 digit: 0%+1.n5%
Measurement scene and 20%10.2%
Tester sealing requirements are shown in Table 2.
The upper limit value of the force selection head (10-100) is +0.05%
The original lower range
The vertical deviation of the pressure gauge bearing chassis plane should not exceed 5. See Table 3 for the requirements of the rotation duration. See Table 4 for the requirements of the piston up and down speed, and the requirements of the pressure gauge indication 5. See the table for the provisions of the allowable range of the effective area, the data static and the allowable error. 2
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(I) Calibration equipment Each calibration equipment should have the following equipment: First-class and first-class suitable equipment; The accuracy should be reduced, mostly: The effective pressure of the pressure gland is determined by the conditions of the pressure gland. The corresponding health and accuracy of the sg Group, g moment, mg group basic level: the scale is not big 2:
dial indicator: the range is srm or 10mr;
stopwatch: the scale is one
basic system error
pressure gauge, the upper limit of the measurement is 1.6, 16, J%0, 40MP2ORR
positive force gauge, the following operation introduction is shown in Table 7,
the upper limit of the measurement is
. -- 3n
Working division
Compressor attached to the liquid combination of compressor oil and disc oil Shangzhou electric screen
(II) Determination of environmental system
Environmental requirements:
The flow rate of the second-class pressure gauge is 202t::10.1
The humidity of the third-class pressure gauge is 20=5T:Relative depth of fire% below:
Original motion light (2:)
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acid should not be used for
before calibration, the pressure gauge should be placed in the pressure chamber for less than 4 hours during calibration to make the calibrated pressure gauge consistent with the calibrated pressure gauge of the next higher level:
4. Calibration items and calibration methods
1.1) Appearance inspection
11: Activation system and special carbon code of the pressure gauge: H.!
When activating by hand, the activator should be smooth and can move freely in the piston without any jamming or sticking. Each special carbon code should be able to stop properly. Accurate fit, not too loose or too tight, keep concentricity: 11.2bzxZ.net
Special base codes of the same quality should be drawn into the same shape and center: 11.3
There should be a quality gap on the special code and the load-bearing corrosion plate, the surface of the gold screen adjuster should be lower than the surface of the special code and 11.4
load-bearing energy plate:
11.5 The surface of the newly made special magnetic code and the load-bearing chassis should have a good wear-resistant anti-corrosion layer (such as hair color, black or black), and should be smooth, without pinholes, rust or other deformation. 12 The pressure gauge should have the following markings:
12.1 The end plate of the calibrator should be marked with the instrument name, model, instrument number, accuracy grade, specification, manufacturer name and month of manufacture:
12.2 The use code, the load-bearing chassis and the active microcomputer should be marked with the instrument number: 12.3 The special code, the load-bearing chassis 1 component shall be marked with the pressure value and the station code in sequence: 13: The active system and special code of the pressure gauge are used in conjunction with the special code, the special code, the piston effect and its connecting parts. The total quality of the pressure produced by the wind should be consistent with the maximum upper limit of the pressure gauge. (II) Inspection of the sealing performance of the test device: Fill the working medium (see length) in the calibrated acid chamber, first install a precision pressure gauge on the nozzle, close the valves to the atmosphere and the oil cup, then make pressure according to the test pressure specified in Table 2, carry out a tightness test for 1 minute, start from the 6th minute, measure the pressure drop at the 5th minute, and then measure the pressure at the other nozzles in the same way. The values shall not exceed the specifications in Table 2.
(I) Check the verticality of the cold extraction line when the chassis is not level 15
Cold generation less
15.1 Before installing the whole system on the tester, use air gasoline to clean it. After settling, place the cold case and the cold screen separately 10:rin:
15.2 Install the cold cylinder to the tester 1, use the wheel to add the working medium to the cylinder, when the workpiece medium starts to come out from the cylinder (not gas), collect the cold with the working medium into the cold difference, and raise the case to the working position: 5.3 Place the water level at the center of the load-bearing chassis, adjust the shear pins on the tester to make the bubble in the middle position, then turn the spirit level (the chassis does not move), and use the same method to adjust the oil level until the bubble is in the middle position: 15, 4: put the spirit level at 0 respectively, and leave 0 times the value of the first change). At each time, turn the chassis 90° and 180°: the bubble should not be too high in the middle position. 5 (IV) Measurement of the appropriate rotation duration
The load pressure specified in Table 3 is placed on the load-bearing chassis, and then the active plate is placed at the 16
position. The rotation speed within 20s is the time range for the needle to start moving. The time interval from the start of rotation to the complete stop is the appropriate rotation duration. During the measurement, The plug should be kept in the initial working position. Delay for 2.3 times, of which the useful time must be not less than the provisions of Table 3 (). The speed of the workpiece is measured by the pressure gauge. According to the initial negative pressure of the workpiece, the special workpiece is placed on the pressure plate, and then the pressure is made to make the workpiece in the first working position, close the lower door of the workpiece, and vertically place the dial gauge at the center of the special workpiece to raise the dial head by 5r-, and then the workpiece is moved at a speed of about 0.-60r/min. The case leads the day and month to rotate, and the resistance is about 2:, and the percentage indicator is worn. The height of the drop movement is measured, and the time is measured in seconds. The time for each measurement should not exceed mim, and the maximum value should not exceed the provisions of Table 1.
Six) The effective area of the piston is measured
18 Measurement method
1 As shown in Figure [, the first-grade pressure of the standard makes the live case system and the key test pressure live system number on the same · calibrator or use a pipe to reverse the two calibrators, reduce the vertical position of the two pressure proof live cold (adjustment method This program is actually 15.3 and 15.4!, the historical concentrated pressure static balance method, the drum function dynamometer and the "grade pressure bucket are selected for comparison and measurement 18.2 Measurement of the live speed effective surface root using the initial balance method: the pressure of the tested pressure gauge is about 15% higher than the upper limit value of the negative business (special code, live case and its reverse connection parts) The special magnetic code in the negative business (special code, live case and its reverse connection parts) is respectively changed to the sprayed and the first-grade dynamometer. The chassis is used for wheel pressurizers. When the two pistons are in working position, if the two pistons are unbalanced, add small bricks on the chassis or special foundation at the rising rate. When the two pistons are half balanced, the pistons should maintain the working position at the starting balance point during the whole process of measuring the effective area.
18.3 After the effective area measurement, the starting balance point must be measured. The difference between the second and the first pressure is not The load at the initial equilibrium point is 0.5% and 0.5% respectively. The upper limit of the measurement should be 25%, 50% and 100% respectively. The upper limit of the measurement should be 25%, 50% and 100% respectively. %, 75% and 1% are selected for comparative measurement. For the second grade pressure, measure 4 points for pressure increase and pressure decrease respectively. For the third grade, only measure when the pressure increases to 4 points.
18,6 to determine whether the work is half balanced. Observe whether it maintains the original position or decreases at the speed that is not required.
18.7 The effective area of the work is calculated according to the formula: A,=AnAn.
Where: A. is the pressure being tested! The first point is (-1.2, ..., n: station effective area single value (em): - high level pressure square effective area (m): state - after the initial equilibrium point. Effective at the first measuring point of the grid force special code quality (g: An
- after the initial equilibrium point, effective at the first measuring point of the grid force F small family code recording (k): - after the initial equilibrium point, the quality of the special code placed on the first measuring point of the high level pressure:
after the half-drop point, placed on the high level internal force calculation English: ~ measuring point of the small code volume (kg):
18.8 need to be effective return average value, according to formula (1) to get the individual value according to the small formula to take the teacher mean: A
formula: A - the average value of the effective area Im): A: - by formula (AAA) get the single draw R-:·Number of measurements, 8 for third-class hydraulic pressure gauge, 4 for third-class pressure gauge: 18.9 The relative error of the effective internal product of the loop is calculated according to the formula: 2-+×10%
Where: 64——Relative error of effective area: ——The difference between the effective area of the piston and the average value is 8-11The average value of effective area (cmr) 19 The allowable range, data revision and allowable error of the effective area are shown in Table 6, () The measurement of the sensitive network
is the measurement of the sensitive network of the gauge. During the test process, the two discs are rotated clockwise at an angle of about 3[--/min: When the test pressure gauge and the higher-level pressure gauge are balanced under the working pressure, the minimum modification that can destroy the balance of the pressure gauge under test is used, and its value is the sensitive network of the pressure gauge. The relevant sensitivity of the dynamometer shall not exceed the current value in Table 5. (VIII) Determination and verification of the quality of special code, piston and female connection 21 Special code, case modification and its connecting parts should be based on the piston as the effective area, the calculation location of the use of the special code, the piston and its parts can be corrected by the gas buoyancy (three-pressure sub-meter special compensation code, the piston and its parts can be corrected by the gas buoyancy): the actual quantity is calculated according to the formula:
In the formula:
m - PA(1- P
Special code, case and its parts must be measured (ki): the value of the mother (P:
Yan Ge normal dynamometer live stone effective area double (): air density (consider 1.2kgm):
Special code, live cost and connection material density [steel = 7.8101, =?.7x 10ikg/imy:
Check the strength of the place of use (m)
22 Unfortunately, the change of the sequence after the plug is compressed has an impact on the uncertainty of the dynamometer, and it is necessary to correct the case. The special code, piston and weight of the force connection
13.1 Measure the upper limit value of 25~60MFa of the second-class pressure j1, the special code, the work skin H connection sign, and the quantity, and calculate according to the following formula:
- pa(t+a)t+βpn?
Wu Zhong:
When the pressure is unchanged at 20°, take the pressure (P) which is 50% of the upper limit value of the measurement (5:
-shape coefficient (the corresponding change value of the effective product caused by each change of the pressure) (Py-
-) depends on the expansion seat and the new plug machine light, size and pressure gauge structure, and its production is calculated according to the following formula, - ()
The strength modulus of density and width (Pa). Button on =U.2U6×20Pa; Middle: F, F,
Piercing ratio of piston, pin 1.28:,
Outer half of the piston [m];
Radius of the piston (m)
22.2 Pressure gauges with upper limit of 200 and 250: Counterweight of the gauge: When the special gauge of the pressure gauge must be changed according to the general requirements, the mass of the special gauge is calculated as follows: 22.2.1
m, - apA (1-E)[1 +29]
Wu Zhong: Towards,
The special base code quality plate of the small increase in pressure (g:: The initial pressure of the measured pressure (any pressure) (Pa) +
The difference between the measured pressure and the initial pressure (increase in pressure) (Pa).7)
22.2. When the special base code of the pressure meter does not need to be signed and used, its special effective code quality is calculated according to formula (4). At this time, the square meter must be equipped with and attached with a special base code to compensate for the pressure. The influence of deformation of the working case on the quality and allowable error of the additional special code is shown in Table 1. The formula (-2) for the special code and the selected parts of the pressure is applicable to the nominal area of 0.U5cn, 5.-250MP. Pressure gauge: value 2.710
Pressure gauge with bearing rod, the bearing rod is not in the upper wave body, the buoyancy is reduced, and the solution is calculated as follows:
△m = pv
Where:
T working medium density (ka/m):
V-the volume of the working medium required in the height of the working medium shown in Figure 2, including the head of the working body (m3).
23.1 The measurement of volume V can be carried out by the following two methods: 23.1.1 Calculation of the center of mass;
23, 1.1 Place or weigh the corresponding part in the active head, in the dew-proof member cup, calculate and displace the volume of the liquid,
24 follow-up special code, the piston does not have the consideration of the allowable error and the measurable expected error
the actual and the allowable difference between the calculated mass (calculated according to Sections 21, 22.1, 22.2.1 and Appendix 224.1
)
the second-class pressure should not be greater than +0.02%;
the third-class pressure gauge should not be greater than Ding1(.05%;
the measured temperate zone
the second-class pressure should not be greater than ±0. 04%;
The third grade pressure gauge should not be greater than 10.01%.
The calibration of non-
25 special land code with right-handed horizontal rod of national 2: According to the non-automatic horizontal hidden environment calibration procedure and the "calibration procedure for pressure gauges" approved and implemented by the National Technical Supervision Bureau, it shall be selected.
5. Treatment of calibration results and calibration cycle
The pressure gauge that meets the requirements of this regulation after calibration shall be issued a certification certificate: the calibration result of unqualified pressure gauge shall be issued a certification cycle of pressure gauge, which is one year for new construction and one year for use and after repair. Appendix
5. Small quantity
55 --6
35--80
_85:- 50
105-1m
115 - 121
[25·-133
Additional special magnetic code quality and allowable error Additional use of random
The amount of
4.0 ±(1.4
Force measurement
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265-21m
245220
225-221
235-24m
245-251
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pregnant
25.0 =0.9
29.41= 1.41||tt ||37.1±!.1
42.)±:.0
70.0 ±1.0
76,=1,11
in the table; Appendix 2 Special brick weight meter for 5-250.MPh pressure gauge manufactured according to standard 1GB6863-[986] Formula P
Special standard weight (k:
Measured pressure is 10P, positive force:
Tested pressure gauge effective area 1n:
Gravity of the place where the pressure gauge is used (m): Air density (kg/ml:
Special base weight, piston total weight in the connection material (kgtr): Deformation coefficient ():
2 brick weight, anti-pin (
1 2. -, 242.
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