JJG 239-1994 Second and third class standard piston pressure vacuum gauge JJG239-1994 Standard download decompression password: www.bzxz.net
This procedure is applicable to the calibration of digital time interval measuring instruments with measurement values ​​greater than 10ns, which are newly manufactured, repaired and in use.

Second and third grade standard piston pressure vacuum gauge verification procedures JJG239-1994 Second and third grade standard piston pressure vacuum gauge verification procedures YerinlcatinnRegalatinn af StandardPistnnPressurevacupn Gauge(Grade&)JJG 239—1994
代善235——15%1
This verification procedure was approved by the State Technical Supervision Bureau on April 5, 1004, and took effect on December 1, 1994. Responsible unit: China Institute of Metrology Drafting unit: Shandong Institute of Metrology The drafting unit of this technical article is responsible for the interpretation of the entire procedure. The main drafters:
年求页 (Shandong Institute of Metrology) *Additional drafters:
(China Institute of Metrology)
Technical requirements
Qualification conditions
Verification items and determination methods
Verification results processing and verification, the same period
Second and third class standard case format Beijing Audit Verification Record Appendix 2 Verification certificate content format
Appendix 3. Verification procedures for gravity acceleration records in major Chinese cities
Third-class standard pressure vacuum gaugesThis regulation is applicable to the pressure of 1-U,25M, 00.1-
0)M5a, second-class (U1S) standard pressure vacuum gauge (hereinafter referred to as micro pressure gauge):
1. Overview
The gravity acceleration records in major Chinese cities
Verification procedures for gravity acceleration records in major Chinese cities
Third-class standard pressure vacuum gaugesThis regulation is applicable to the pressure of 1-U,25M, 00.1-
0)M5a, second-class (grade) standard pressure vacuum gauge (hereinafter referred to as micro pressure gauge) verification:
1. Overview
The gravity vacuum gauge is a quality standard instrument that uses the principle of force balance to measure pressure. It is a small vacuum gauge that requires a system and special compensation code, and is mainly used for pressure transfer, inspection and testing.
2. Technical requirements
The current error of the pressure vacuum gauge is shown in Table 1. Table
.ks source
(0.2hungry:
Certificate
0.nI (.C25MPzu.)
12.5VP
C.025M
(I2 -.2Mu-T
actual wind
maritime
(.I -n.eI*Ms
3.1vPa St
The instrument should be able to ensure that there is no pressure drop after 5min in the test of 10rrin under 0.3MPa pressure: the verticality of the pressure knife point gauge is not greater than 5. The provisions of the continuous rotation time of the live seat are shown in the teaching, and the minimum wear and tear of the live seat is shown in Table 3. 2www.bzxz.net
Pulling 9 level
Special code outer diameter
Not less than
Filling diameter
| full rotation except when small
people expensive slow
Laniei
to "built in/()
in use or after cleavage
pressure is the effective area of ​​the living room measured by the air meter, the starting value of the balance point, the pressure value of each visual point and the end? 1t21
balance point value should be in accordance with the provisions of the world
starting half point hill position
allowed to measure the point value
U.15 4.2041.25
0.15 T.2n u.2
The sensitivity of the positive force vacuum gauge is not more than 100% of the first-class standard instrument. The piston sensitive area of ​​the single-point vacuum gauge is allowed to be fixed. The data and the allowable error are shown in Table 5. The direct effective area of ​​the product is m
0.9571.1.7070
The effective area is the same as the number of effective areas. ooxot
Active-effect dough machine
Detailed reading (%1
Use special vacuum gauge, sand, condenser and its connecting parts to measure the allowable error, first-class is ±0.02%, second-class is ±0.05%-
Pressure accuracy gauge, pressure and negative pressure, each with 10
see Table 6 Note: This product should have the following markings: 7 pieces of force and negative value, the product force and negative value, the product pressure and value P-L, DUS, the nameplate of the force calibrator is marked with the instrument name, model, terminal number, accuracy level, test specification, manufacturing 11.1 ||Factory name, year and month of manufacture.
11.3 Special low code, the load-bearing plate shall be marked with the calibration pin on the screen, 11.3 Special code and the load-bearing plate shall be marked with the selected force value in MPa and the number of the silicone rubber, the special code for negative pressure value shall be preceded by a " " sign,
12 Special code for pressure relief system 12.1 When used for rotating relief, the seal shall be flexible and able to move in the cylinder without any stuck parts or jamming. The working surface of the newly manufactured vacuum gauge and piston cylinder should be smooth and free of spots. The working surface of the piston cylinder should not have any rust that affects the measuring performance. 12.2 The special parts should be compatible and interchangeable, and should not be over-tightened or over-tightened. 12.3 The reverse side of the special parts and bearing plates should be adjusted and adjusted, and the screws should not be higher than the surface of the parts. The surface of the newly manufactured special parts and bearing plates should have a good anti-drip layer (such as hair, black or white, etc.), and be smooth, without sand and rust. 12.5 The special parts and bearing plates of the pressure vacuum gauge should be matched with each other. 3. Verification conditions 13 Verification equipment 13.1 Calibrators 13.1.1 Measuring instruments of first-class and second-class standard pressure gauges with an upper limit of 0.6 m or other calibrators with corresponding accuracy level.
The machine should be accurate to the same level, with two standard code: the ideal instrument and its
special level: the graduation value is "2
% and its point stand: the range of the dial indicator is 5.-10:ul1, stopwatch, temperature and humidity meter
measurement base upper limit.4a case force meter
light pressing device
measurement of active system vertical change and special room effective area for the base: the standard code is 180mam, the quality is g, no, middle, upper, lower line D.DIKmn, surface quality R, small and large Jn.pum14 lower rotten medium | |tt||The working medium of the positive pressure vacuum gauge is a mixture of variable speed oil, variable speed oil and kerosene. The operating viscosity at 2 hours should be 9~12rm/, and the value should not be greater than 0.05K>[m/name: 15 Environmental conditions
The timing error also requires:
15,1 The calibration temperature of the first-class pressure vacuum gauge is (2=2); the calibration temperature of the third-class pressure gauge is (5)15.2 Relative vacuum ≤80%,
15.3 Before calibration, the insulation system components of the pressure gauge should be placed in a calibration room for at least 4 hours, and placed at the specified calibration temperature for more than 2 hours before calibration. IV. Verification Items and Verification Methods
Check the appearance of the pressure gauge according to the requirements of 11-12. 17. Clean the calibrator. Install a precision pressure gauge with a negative upper limit of 0.4M1Pa on the interface of the calibrator. Close the valves leading to the piston system and the air supply. Make the pressure rate U.3MHa, then close the air supply valve, keep the pressure for 5 seconds, then increase the pressure value to 0.3MPs, close the air supply valve and observe. The inspection result is in compliance with the provisions of Article 2. 19. Check the piston shaft. Clean, install, fill with working medium and adjust the pressure gauge activation system. 18. Wipe the piston and the active screen with a clean cloth, and flush the piston and the mud with aviation oil (or solvent vapor elimination) and dry them separately.
Flow: When necessary, the bearing of the inertia wheel also needs to be filled with a slippery mud. 18.2 With the special combustion joint, install the pressure vacuum gauge's live system on the standard live cold dynamometer. Make the live case part open to the appropriate manufacturer's hole (note that the airtight cavity and the connecting sound are excluded): then place a special code on the power plate of the bed vacuum gauge.
18.3. Raise the level to the working position, place the level on the special position (close to the middle position), adjust the needle on the checker to make the air bubble at the zero position, then rotate the level 90° (the bearing and the position do not move), and adjust it in the same way to make the air bubble at zero position. Repeat this adjustment until the level is at these two positions and the air bubble is at zero position.
18.4 Place the level at 0° and 90° positions respectively (0° is the first arbitrary position), and at each position, place the load-bearing plate together with the foundation The code rotates 9U\, 180, at this time, the deviation of the bubble from the zero position meets the requirements of Article 3: 18.5 The piston system has been installed with a pressure vacuum gauge in the level instrument, and the above requirements have been met. Check whether the bubble of the level instrument on the active system is in the correct position. If it is not in the correct position, adjust the level instrument: 19, and measure the duration of the active rotation according to the load stop specified in Table 2. Place the special base code on the pressure gauge bearing plate 1:, and then raise the pressure piston to the working position, and rotate it in the direction of the maximum frequency. The interval from the start of rotation to complete stop is the duration of the active rotation. During the measurement process, keep the pressure gauge at the optimal working position. The duration of the rotation of the pressure vacuum gauge piston is measured 2 to 3 times under different conditions with and without inertia wheels, and the average value of each is taken. Each type of piston must have 2 values ​​that meet the requirements of Table 2: 20 Measurement of the degree of degradation of the piston load-bearing rod
A small cup with a diameter of 50rmn and a depth of about 10mm (preferably made of lead or pick-up glass material, this cup is also used to measure the effective balance of the piston) is installed at the upper end of the piston load-bearing rod by means of a camera connection. The bottom of the piston is connected to the similar hole of the piston. According to the negative pressure specified in Table 3, the special delay weight is placed on the upper plate of the pressure gauge, and the pressure is created by a calibrator to raise the piston to the working position. Place a dial gauge vertically at the center of the bottom of the cup, raise the head of the gauge by 3-5 mm, adjust the required working position to 1-2 mm higher than the idle position, then close the airtight system, and rotate the measuring wheel for about 2 minutes at a high speed to observe the distance the dial gauge pointer moves. At the same time, measure the time with a comparator. Each measurement should not exceed 3 times. Measure 3 times and take the maximum value. Then, open the side hole of the vacuum gauge to the atmosphere and measure it with the same method! The values ​​should all conform to the requirements of Table 3.
21 Effective dosage
21.1 As shown in Figure 1, the vacuum gauge system, together with the special female joint and the standard dynamometer piston system of Shang·, etc., are installed in the same calibrator 1
country! On the effective surface measurement diagram of the live case, according to the method of Article 19 of this regulation, adjust the two 1-month control process: 2-high and 3-6-low vertical positions. Use the physical balance method, 2 half of the small: 5-small:: H made through convex: 9 special account joint
method, the force meter will be compared with the higher level pressure 112
ten thousand meters:
21.2 Measure the effective internal area of ​​the active competition, use the initial balance method, and measure the effective area of ​​the active accumulation of the measured pressure and negative pressure,
first make the bottom of the active competition and the side holes pass, measure the effective area of ​​the active part of the mountain production, and then make the side holes open to the atmosphere, measure the effective area of ​​the negative pressure part, 21.3 The starting balance point and each measuring point specified in Table 4 shall be used, and the special basic code (color material code) shall be placed on the higher level force meter and the pressure meter being tested! Use a pressure tester to make the two pistons in the upper working position, and observe the initial equilibrium position of the two pistons by means of an excitation light. If the pistons are not attached, add a small carbon monoxide in the small puff on the upper end of the special silicon piston or the anti-weight rod until the two pistons are attached. Each measuring point needs to be opened and the pressure reduction measurement should be carried out. During the pressure reduction measurement, the value should be changed: During the whole process of measuring the effective area of ​​the piston, the two pistons should keep the position at the initial equilibrium point, and rotate the piston clockwise at an initial speed of about 30)r/min (the gear does not rotate). 21.4. After the effective area measurement of the piston is completed, the initial equilibrium point must be measured. The difference between the two added small foundations must meet the requirements in the table. Otherwise, a new measurement is required to determine whether the two cases are balanced. It should be observed whether they remain unchanged in the working position. The effective area of ​​the piston is calculated by the difference in pressure point. The effective value of the piston at the measuring point is calculated by formula (1): A,-Am, +am
or:
the effective area of ​​the piston of the tested pressure gauge is a separate value, m, and the standard pressure gauge has an area value, rm; the starting balance point is the mass of the special weight placed on the first measuring point of the tested pressure gauge, kg: m
after the starting balance point, the mass of the small weight placed on the first measuring point of the tested pressure gauge is kRm,… Starting balance point: the mass of the special weight placed on the first measuring point of the standard positive pressure gauge, kg: starting balance After the balance point, place the small mass on the standard positive force gauge at the first measuring point, gA
22.2 The positive force vacuum gauge is effective at zero and the half-mean value is discarded on (2) to calculate SA
Where: A plate
is effective and the average value is used, m:
The individual value of the effective area of ​​the plug obtained by formula (1), cm: A
Measurement point, = 1, 2, ";
Plate number, = 6,
22.3 The relative error of the effective area is calculated by formula (3): ×100%
In: 4'—Corresponding error of effective front sight: AA
The range of effective single value and actual front value, m(2:
The allowable range of effective area of ​​air meter piston, the number after the agreement (the value after the agreement shall be filled in the calibration certificate) and the corresponding error shall comply with the provisions of Table 5
24 The air meter sensitivity is measured at the upper limit pressure of the air meter at the pressure point being tested. When measuring, the two close clockwise At a speed of 3-1000rpm. When the standard pressure and the test pressure are balanced under the above-mentioned pressure gauge, add the compensation code that can damage the balance of the two pressure gauges to the pressure gauge, and the mass of the other is the pressure gauge. Its value shall comply with the provisions of Article 25. The calculation and verification of the mass of the pressure gauge and its components when measuring the pressure gauge and the pressure gauge, the mass of the components, the effective area of ​​the pressure gauge, the gravity acceleration of the place of use and the air pressure counterweight, and the mass of the components shall be calculated according to formula (4):
Wherein: m
special code, live invitation and the mass of their connecting parts, kks: measured force times: PB:
pressure point air gauge pressure or color stop part effective area of ​​the piston, north; A
air density (take 1.2k/m):
special code, the density of its connecting parts material (take 7.8×10k/m, 2.7%10kg/r);
pressure gauge other places of gravity addition, when the force or negative pressure is M as the unit, the live invitation is the effective area in cm, the special code, live invitation and the mass of the connecting parts are calculated according to formula (5):
n - pa 101 + 0)
Wherein: force - measured pressure or negative pressure value, M: pressure vacuum gauge measuring positive force and negative pressure live invitation effective area, Cm The meanings of other symbols are the same as those in formula (4).
26. The specifications of special pressure gauges, active bases and their connecting parts shall be carried out in accordance with relevant national calibration regulations. The difference between the measured value and the calculated value shall meet the requirements of Article 9. V. Processing of calibration results and calibration cycle
27 For pressure gauges that meet the requirements of this regulation, a calibration certificate shall be issued. For those that fail to meet the requirements, a calibration return plan shall be issued. The calibration period of a new pressure gauge is generally 1 year; the maximum period after use and maintenance is 2 years. 28
Appendix 1 Verification record of second and third class standard piston pressure vacuum gauges Submitted for inspection
Tested instrument
Standard instrument
Standardized instrument Effective blood volume 4
1. External inspection
Testing period
Measuring range
No. Measuring range
Palm family dispatch
MPaManufacturer
MIT agent
(mPlace of use 2. Case inspection of the tester 7. Internal inspection of the load-bearing net plate plane for the density line measurement accuracy n tt|| Clean plug change duration measurement early tt|| With amplitude wheel (1) tt|| Without hunger wheel (1) tt|| And side hole) tt|| 5. Measurement of active descent speed without opening side hole (1) tt|| 6. Sensitive net of the instrument under test tt|| 7.The effective surface area of ​​the piston under test is A
Pull fixed point analysis
Flat new point
Flat fine point direct test
rn: -Akk
Average
sHalf mean
nm/r:vin (2j
mm/tninQuantity
tan(2)
m/inMaximum value
In the water-only device, the quality of the two effects is the quality of the two effects, ... -Sm.
Average positive pressure of the effective area of ​​the active case A
The error of the effective area is 4=
Relative error of the effective response
8. The quality of the active effect and its connected parts
9. The quality of the special code
1U. The quality of the fixed line
Ya Fader
Special method of production
amn-min
mm/mi!
sr/ain
The reduction in the active state system
A,=Am+Sm
Negative positive 44 =
fish pressure A
measure rkg
11. The number of the inspection certificate or the inspection conclusion is recorded 2
basic error length
live letter and its connecting parts must be measured correctly! K
belt special wheel
yi rate decrease sensitivity increase due to courtesy
no milk
check the time secret
price
set up the small place to respond
special code to generate low power
- 1,4:1
Verification certificate internal format
.01.-0.25
Study and use the most code pressure and production resources
Download the cold capital this certificate
Appendix 3
China's major cities gravity acceleration institute
1m (1+)
10,2341
Government quota
Nuclear personnel
Number/dye
un min
Enrii-nin
100 (1+
Qiaolu. Daqi
and Lanjiang
source pull strip
.71882
(-- e)
n 2388
10 2195
102021h
10 2092
10 2671
U,2224
102122
n 2017
92171F
1:7206
.21112
1:1 2137
10.24:112
10 220W4
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