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National Metrology Verification Regulation of the People's Republic of China JJG59-2007
Piston Gauge
Promulgated on 2007-06-14
Implementation on 2007-12-14
Promulgated by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China JJG59—2007
Verification Regulation of Piston Gauge
Verification Regulation of Piston GaugeJJG59—2007
Replaces JJG727—1991
JJG129—1990
JJG59—1990
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on June 14, 2007, and came into effect on December 14, 2007.
Responsible unit: National Technical Committee on Pressure Metrology Drafting unit: Shanghai Institute of Metrology and Testing Technology, China Institute of Metrology
Jiangsu Institute of Metrology
This regulation is entrusted to the National Technical Committee on Pressure Metrology for interpretation -TKAoNrKAca=
Drafter of this regulation:
JJG59—2007
Caibao Da Nei Tuan Fang Che Huo
Zhang Pengcheng (China Institute of Metrology)moBe0ieon0
Hu Anlun (Shanghai Institute of Metrology and Testing Technology) Zhang Qiang (Jiangsu Institute of Metrology) Tu Limeng (Shanghai Institute of Metrology and Testing Technology) Yue Jin (China National Institute of Metrology)
References·
Overview·
Metrological performance requirements,
Accuracy level
Piston effective area·
Special magnetic code quality
Verticality
Piston rotation duration·
Descending speed
Discrimination
Sealing
Periodic change rate of piston effective area,
5 General technical requirements
Appearance ·
Piston system ·
Special base and bearing plate
Measuring instrument control ·
Verification items
Verification conditions
Verification methods
Processing of verification results
Verification cycle
Appendix A Temperature correction and pressure deformation coefficient
JJG59—2007
Appendix B Piston pressure Format of force gauge calibration record (reference) Appendix C
Format of inner page of calibration certificate (reference)
Appendix D
Gravity acceleration of major cities in China
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1Scope
JJG59-—2007
Verification procedure for piston pressure gauges
This procedure applies to the initial calibration, subsequent calibration and in-use inspection of piston pressure gauges with an upper limit of the measuring range of 0.6MPa to 500MPa and liquid working medium. 2 References
This regulation refers to the following documents:
JF1001—1998 "General metrological terms and definitions" OIMLR110—1994 Pressure Balance (International Recommendation for Pressure Balance) JG99—2006 "Magnetic Code Verification Procedure"
When using this regulation, attention should be paid to using the current valid versions of the above referenced documents. 3 Overview
The piston pressure gauge is a metrological standard that uses the principle of fluid static balance (i.e. the fluid pressure acting on the effective area of the piston is balanced with the gravity it carries) to measure pressure. The piston pressure gauge generally consists of a piston system, a special code, and a calibrator.
According to the structure, the piston pressure gauge can be roughly divided into a simple piston pressure gauge, a back pressure type piston pressure gauge, and a controllable piston pressure gauge: according to the medium, it can be divided into a liquid medium piston pressure gauge and a gas medium piston pressure gauge. This regulation is for a simple piston pressure gauge for liquid (oil) medium. The piston pressure gauge must indicate the nominal range and measuring range. If the lower limit of the measuring range cannot be determined, it shall be calculated as 10% of the upper limit of the measuring range.
The upper limit of the measuring range of the piston pressure gauge can be selected from 0.6MPa, 6MPa, 25MPa, 60MPa, 100MPa160MPa, 250MPa, 500MPa. If the range of the piston pressure gauge under inspection is inconsistent with the above range, the value closest to the above range can be selected. 4 Measurement performance requirements
4.1 Accuracy grade
The accuracy grade and maximum allowable error of the piston pressure gauge shall comply with the provisions of Table 1. Table 1 Accuracy grade and maximum allowable error
Accuracy grade
Maximum allowable error
When the pressure value is below the lower limit of the measuring range, it is ±0.005% of the lower limit of the measuring range
When the pressure value is below the lower limit of the measuring range, it is ±0.01% of the lower limit of the measuring range
When the pressure value is within the measuring range, it is ±0.005% of the actual measured pressure value
When the pressure value is within the measuring range, it is 0.01% of the actual measured pressure value
Accuracy grade
JJG59—2007
Table 1 (Continued)
Maximum allowable error
When the pressure value is below the lower limit of the measuring range, it is ±0.02% of the lower limit of the measuring range
When the pressure value is below the lower limit of the measuring range, it is ±0.05% of the lower limit of the measuring range
4.2 Piston effective area
When the pressure value is within the measuring range, it is ±0.02% of the actual measured pressure value
When the pressure value is within the measuring range, it is ±0.05% of the actual measured pressure value
The maximum allowable error of the effective area of the piston of the piston pressure gauge shall comply with the provisions of Table 2. Table 2 Maximum allowable error of the effective area of the piston
Accuracy grade
4.3 Special code quality
Maximum allowable error of the effective area of the piston
The maximum allowable error of the special base code quality of the piston pressure gauge shall comply with the provisions of Table 3. Table 3 Maximum allowable error of special code quality
Accuracy level
4.4 Verticality
Maximum allowable error of special code quality
The deviation of the verticality of the piston bearing plate plane to the piston axis of the piston pressure gauge shall comply with the provisions of Table 4. Table 4 Verticality
Accuracy level
4.5 Piston rotation duration
The piston rotation duration of the piston pressure gauge shall comply with the provisions of Table 5. 2
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Vertical degree is not greater than
Upper limit of measuring range/MPa
60,100,160
250，500
5 Drop speed
JJG59-—2007
Table 5 Piston rotation duration
Special base code outer diameter is not greater than/mm
3min30s
Piston pressure gauge piston drop speed shall comply with the provisions of Table 6. Table 6 Drop speed
Piston rotation duration is not less than
2min30s
3min30s
2min30s
2min30s
Piston drop speed is not greater than/mmmin!
Upper limit of measuring range/MPaLoad pressure/MPa0.6
Discrimination
Newly manufactured
In use
Newly manufactured
In use
Newly manufactured
In use
1min30s
Newly manufactured
The discrimination of the pressure gauge should be less than the code quality value that can produce a pressure equivalent to 10% of the maximum allowable error. Sealing
The sealing of the piston pressure gauge calibrator should comply with the provisions of Table 7. Table 7 Sealing
Upper limit of measuring range
Test pressure
After 5 minutes, the pressure drop value is not greater than
In use
Upper limit of measuring range
Test pressure
4.9 Cyclic change rate of piston effective area
JJG59-2007
Table 7 (continued)
After 5 minutes, the pressure drop value is not greater than
After verification, the cyclic change rate of piston effective area of piston pressure gauge shall comply with the provisions of Table 8. Table 8 Cyclic change rate of piston effective area
Accuracy grade
5 General technical requirements
5.1 Appearance
The cyclic change rate of piston effective area is not greater than 0.002%
5.1.1 The nameplate of piston pressure gauge calibrator shall be marked with the name, model, instrument number, measuring range, accuracy grade, manufacturer's name and date of publication. 5.1.2 The bearing plate and special code shall be marked with the number, pressure value or nominal mass value and the order number of the code. 5.1.3 After the piston pressure gauge driven by the motor is powered on, the motor shall rotate normally and smoothly, and there shall be no jumping that affects the measurement performance.
5.2 Piston system
The piston of the piston pressure gauge shall rotate flexibly and move freely in the piston cylinder without any jamming. The working surface of the piston and piston cylinder shall be smooth and free of rust spots, and there shall be no rust or scratches that affect the measurement performance. 5.3 Special code and bearing plate
5.3.1 The surface of the magnetic code and bearing plate of the piston pressure gauge calibrated for the first time shall be intact, and the code with wear-resistant and rust-proof layer (such as bluing, blackening or chrome plating) shall not have rust spots, and shall be smooth without sand holes and other damage. 5.3.2 The concave and convex surfaces of each code of the piston pressure gauge shall be able to fit correctly, not too loose or too tight, and can maintain concentricity. 5.3.3 Codes with the same nominal value shall have the same shape and size. 5.3.4 If there is an adjustment cavity on the code or the bearing plate, the upper surface of the adjustment plug shall not be higher than the surface of the magnetic code or the bearing plate. 5.3.5 Special codes for piston pressure gauges above grade 0.02 (including grade 0.02) shall be made of non-magnetic metal materials. 6 Control of measuring instruments
Control of measuring instruments includes initial verification, subsequent verification and in-use inspection. 6.1 Verification Items
For the verification items of piston pressure gauge, please refer to Table 9.4
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Verification Items
5.1 Appearance
5.2 Piston System
5.3 Special Code and Load Plate
4.2 Piston Effective Area
4.3 Special Code Quality
4.4 Verticality
4.5 Piston Rotation Duration
4.6 Drop Speed
4.7 Discrimination
4.8 Sealing
Private Period Change Rate
4.9 Piston Effective Age
Note: In the table
Verification clause
6.2.1 Verification
indicates the items to be inspected,
verification with main standard
JJG59—2007
Table 9 Verification items
First verification
indicates that it may not be
0.005 The piston pressure gauge of the system is selected by the national pressure standard transfer. The maximum allowable error is less than the pressure gauge to be inspected. Subsequent verification
Inspection in usebzxz.net
Other grades of active pressure gauges can be selected. The maximum allowable error of the effective area is 1/2. The piston pressure gauge with the same measurement upper limit can be selected. The range is greater than 60M. Generally, piston pressure gauges with different measurement upper limits can be selected! See Table 10.
is the standard instrument
the upper limit of the piston gauge to be tested
the main standard instrument range can be selected
the upper limit of the standard piston dynamometer
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6.2.1.2 Ancillary equipment for verification
The ancillary equipment for verification is shown in Table 11.
6 or 25
60 or 100
60, 100 or 160
60, 100 or 160, 250
100 or 160, 250, 500
Instrument name
standard balance or mass comparator
standard foundation
foundation·
level"|| tt||Divider gauge or micrometer
Stopwatch?
Precision pressure gauge
Piston position indicating device
Liquid level difference measuring ruler
Differential pressure indicator
Note: * indicates necessary equipment.
6.2.1.3 Working medium
JJG59——2007
Table 11 Ancillary equipment for calibration||tt| |Technical requirements
Meet the requirements of the corresponding grade regulations
Meet the requirements of the corresponding grade regulations
Gram group, milligram group
Graduation value is 1~2
Range is 5mm or 10mm
Graduation value is 1/5s or 1/10s
Select the appropriate grade and upper limit position indication according to the situation, the resolution is better than 0.1mm
Determine the resolution, the resolution should be better than 1mm
Select the appropriate resolution according to the range
The recommended working medium for piston pressure gauge is shown in Table 12. Table 12 Working medium and performance indicators
Working medium
Transformer oil or a mixture of transformer oil and kerosene Esters of esters ... Special magnetic code, piston and its connection. Weigh the mass of the parts. Special magnetic code, piston and its connection. Weigh the mass of the parts. Verify the effective area and identification of the piston. Verify the verticality. Verify the descent speed. Verify the duration and descent speed. Verify the sealing performance. Observe the piston balance. Measure the liquid level difference of the piston reference plane. Optional. When the piston is balanced, the pressure difference between the indicating standard and the piston pressure gauge being tested. Kinematic viscosity of the working medium (at 20℃)/mm·g Acid value is not greater than/KOHmg.g9-12. The calibration of the piston pressure gauge is carried out at room temperature (meeting the requirements of Table 13) and relative humidity is 80% or less constant temperature room. Before calibration, the piston pressure gauge must be placed under environmental conditions for more than 2 hours before calibration can be carried out. Table 13 Ambient temperature
Accuracy level
Ambient temperature
Piston effective area calibration
(20±0.2)℃
(20±0.5)℃
(20±1)℃
(20±2)℃
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Other items calibration
(20±2)C
(20+2)C
(20±2)℃
(20±2)℃
6.2.3 Other conditions
JIG59—2007
There should be no mechanical vibration that affects the measurement performance during calibration. 6.3 Verification method
6.3.1 Appearance inspection
Inspect by hand, visual inspection or power on according to 5.1. 6.3.2 Piston system inspection
Clean the piston and piston cylinder of the piston pressure gauge with aviation gasoline or solvent gasoline, leave it for 10 minutes, and after the surface solvent evaporates, inspect by hand and daily test according to 5.2. 6.3.3 Special code and load plate inspection
Inspect by hand and visual inspection according to 5.3.
6.3.4 Verification of sealing performance of the tester
Fill the inner cavity and each conduit of the tester with working medium, first install a precision pressure gauge on one of the nozzles, close the valves to the atmosphere, oil cup and pressure pump, close the valve to the detection port, and conduct a 15-minute sealing test according to the test pressure specified in Table 7. Starting from the 11th minute, calculate the pressure drop value in the next 5 minutes. Then conduct sealing performance inspection on the remaining nozzles in the same way. 6.3.5Verification of the verticality of the bearing plate plane to the piston axis. Install the piston cylinder on the pressure gauge tester, use the tester to create pressure to press the working medium into the connecting pipe and the piston cylinder, until the working medium overflows from the piston cylinder and no bubbles are discharged, put the piston with the working medium on the surface into the piston cylinder, and pressurize it after installation to make the piston rise to the working position. Note that during the installation process, try to avoid direct contact with the piston and piston cylinder with your hands to avoid the influence of temperature changes in the piston system on the verification. Place the level at the center of the bearing plate (top) of the piston pressure gauge, adjust the screws on the tester, so that the bubble of the level is in the middle position: then turn the level 90° (the bearing plate does not move), and adjust it in the same way to make the bubble in the middle position. Repeat this adjustment until the bubble is in the middle position when the level is placed at these two positions. Place the level at 0° and 90° respectively (0° is any position for the first placement), turn the bearing plate 90° and 180° at each position, and read the deviation value of the bubble of the level from the middle position. 6.3.6 Piston rotation duration verification
Use the load pressure of the lower limit of the measuring range (if the lower limit of the measuring range cannot be determined, calculate it as 10% of the upper limit of the measuring range) to make the piston in the working position with a tester, and rotate it in the clockwise direction at an angular velocity of (20±1)10s. The time interval from the start of the piston rotation to the complete stop is the piston rotation duration. Verify the piston rotation duration 3 times and take the average value.
6.3.7 Calibration of piston descent speed
According to the load pressure specified in Table 6, first remove the air in the calibrator, use the calibrator to create pressure so that the piston is in the working position, close the valve leading to the piston, and place a dial indicator (or micrometer) at the center of the special base code, so that the contact of the indicator is perpendicular to the horizontal plane of the special magnetic code and raised by (3-5) mm, and then make the piston rotate freely in the clockwise direction at an angular velocity of about (30-60) r/min. After keeping for 3 minutes, observe the moving distance of the dial indicator (or micrometer) pointer and measure the time with a stopwatch. Each measurement time should not be less than 1 minute. Record the distance the piston descends in 1 minute. Calibrate 3 times and take the maximum value.
6.3.8 Piston effective area verification
JJG59-2007
Install the piston pressure gauge to be tested and the standard piston pressure gauge on the same calibrator (or connect the standard piston pressure gauge and the piston pressure gauge to be tested through a pipeline), and adjust the vertical position of the piston (see 6.3.5 of this regulation for the adjustment method). According to the hydrostatic balance method, compare the area of the piston pressure gauge to be tested and the standard pressure gauge.
To verify the piston effective area of the piston pressure gauge, one of the following two methods can be used according to the situation. 6.3.8.1 Direct balancing method First, determine the masses m and m of the pistons and their connecting parts of the piston pressure gauge to be tested and the standard piston pressure gauge, and then measure the NISTIS reference M of the two piston pressure gauges to start the calibration of the first balance point. The pressure value of the first balance point is generally 10% to 20% of the upper limit of the measuring range of the piston double pressure gauge. Pressurize the two pressure gauges with the calibrator to make the standard and tested pistons in the same position. During the calibration process, add corresponding special codes to the gauges. The pistons of the two pressure gauges are kept rotating in the clockwise direction until they are balanced. If the purchased piston is unbalanced, the two pistons are rotated at a rotation speed of about 30 (60) r/min. The corresponding weights are added to each piston until the two pistons are determined to be balanced. It should be observed whether they remain stable in the working position or decrease at the same insignificant speed. In order to achieve balance as quickly as possible, a differential pressure indicator can also be used to shorten the balance time. After determining the pressure difference between the two pistons, record the current pressure value, piston temperature, the mass of the pressure gauge placed on the two pistons, and complete a test. Then use the same method to evenly increase and decrease the pressure for at least 5 other test points. In each test, the upper limit of the measurement is greater than the value of the pressure difference. The upper limit of the measurement of the tested piston is the upper limit of the measurement. The details of the effective area are calculated according to formula (1): When the pressure reduction calibration is carried out at the calibration point, each calibration point takes a number of times, and the calibration pressure of the calibration state pressure gauge is determined by comparing the individual values with the standard piston pressure gauge, G A (1 + Φ where: A0 is the effective area value of the piston pressure gauge at the i-th equilibrium point at zero pressure and reference temperature, m; A is the effective area value of the piston pressure gauge at zero pressure and reference temperature, m; O
The effective area of the piston, m;
The mass of the piston and the code bearing plate of the standard piston pressure gauge and the tested piston pressure gauge, kg;
The density of the piston and the code bearing plate of the standard piston pressure gauge and the tested piston pressure gauge, kg/m;
The mass of the code added to the standard piston pressure gauge and the tested piston pressure gauge after the pressure value is balanced, kg;
The density of the special magnetic code of the standard piston pressure gauge and the tested piston pressure gauge, kg/m: the density of the working medium, kg/m;
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