Some standard content:
Verification Procedure for Standard Equipment for Liquid Flow Rate
JJG164—2000
Verification Procedure for Standard Equipment for Liquid Flow Rate
Verification Procedure for Standard Equipment for Liquid Flow Rate
.J3G164—2000
代『[G1621966
JJG: 2171989
JJ:: 1621:25>
++++....
The whole regulation was approved by the State Quality and Technical Commission on February 14, 2000, and was implemented on June 1, 2000. The responsible unit: China Metrology Research Institute. The main drafting unit: China Metrology Research Institute. The additional drafting unit: National Water Flow Metering Station Beijing Metrology Institute.
1. Haigong Automation Instrumentation Research Institute.
Dandong Tongbo Measurement and Control Co., Ltd.
This regulation is entrusted to the National Quality Committee of the State Quantity Metering Technology Committee. The main drafters of this regulation are:
Duan Huiming (China Metrology Research Institute).
Qi Xiuzhen (China Institute of Metrology) Participants in the drafting:
T Zihe (National Water Flow Metering Station)
Xie Jiji (Beijing Jiying Testing Institute)
Qiu Liang (Shangjiang Industrial Automation Instrumentation Research Institute) Wei Xiaoguang (Piandong Daobo Measurement and Control Co., Ltd.) 122
2 Maintenance of small works
2.2 Composition
2.3 Path
3 Metering performance requirements
3.1 Flow flow
3.2 Flow rate limit standards
1 General technical requirements
Performance requirements
4.2 Sealing 4
4,3 4.5 Data collection and control equipment 5.5 Metering and control equipment: 5.1 Calibration conditions 5.2 Functional test and determination method 5.3 Calibration result treatment 5. Calibration period ... Appendix A (r: () (uncertainty confidence level P = 95%) Appendix B Notes on bag acceptance at the same time Appendix C Format of the inner page of the certification certificate 1 Scope Liquid flow standard device - calibration Regulations
This regulation is applicable to the calibration of new, in-use and modified static flowmeters (hereinafter referred to as static flowmeters). 2 Overview
2.! The flowmeter to be tested is installed on the device as required, and the concentration expansion system is started to make the concentration meter and flow working standard. The flowmeter to be tested and the flowmeter to be tested are operated step by step. The test value of the two is compared to determine the accuracy and reliability of the flowmeter to be tested. According to the special value-taking method of flow working standard, it can be divided into four types. Static flow method (including start-stop method): In static state: measure the volume of the container within a certain period of time, and calculate the flow rate.
Static volume method (including start-stop volume method): Under static state, measure the volume of liquid in the working device within a period of time, so as to calculate the flow rate.
Dynamic volume method: During the flow of liquid, measure the volume of liquid in the working device within a period of time, so as to calculate the flow rate.
2.2 Structure or
installation must be a filter circulation system, which consists of five parts: the circuit, flow working array, experimental equipment and control equipment.
2.3 Purpose
device passes the value transfer standard of the reverse liquid flow through the closed pipe: it can be used for various liquid flowmeters, calibration and filter flow measurement, and test methods. 3.1 The system components should be single-phase, and the cutoff compensation should be no more than 35×10m2/s. 3.2 Flow rate T. Push standard
3.2, the maximum flow rate of the instrument should be clear, and the reading resolution of the same volume should be less than 15% of the total flow rate.
3.2.2 For the calibration of the water meter, the seven scale lines of the working volume should be given as 1, and the corresponding differential line should be given below
3.2.3 Timer (only for the flow meter and the installation needs) with auxiliary product number 1, the timer product should be 8 hours of heat service not lower than 10% of the installation temperature. The minimum reading value in the timer is 0.0015%. 3.2.4 Whether the water meter is equipped with a product indicator, the indication error should not exceed 2.5% of the measured value. 1204
General technical requirements
4.1 Pipeline conditions
4.1.1 The number of valves, valves and other positive components in the pipeline should be minimized. 4.1.2 The test pipeline should meet the requirements of the test flow meter. 4.1.3 The flow or regulating valve should be installed at the bottom of the test pipeline. Its performance is 4.1.4 The temperature measurement position is generally located at the lower part of the test pipeline. 4.1.5 The non-pressure measurement is generally placed upstream of the test pipeline. 4.1.6 The condensate should be filled in the pipe. If necessary, a gas eliminator should be installed upstream. 4.2 Tightness
Under working pressure, there should be no leakage at the reverse connection of each component of the device. 4.3 1. Working standards
4.3.1 Weighing instruments
generally use mechanical vibration or electronic weighing instruments, and the micro-weighing instruments must be able to: 4.3.1.1
4.3, 1.2 The cables, pipes and outlet cables of the weighing instruments should not produce additional forces on the weighing instruments. 4.3.1.3
The container should not leak
4.3.1.4 In the dynamic measurement method, the liquid should enter the container from the top. 4.3.2 [. Working equipment
4.3.2.! The working equipment should not be delayed, and measures should be taken to reduce the dynamic effect of the liquid level and prevent liquid from overflowing. 4.3.2.7 The inner surface of the measuring instrument should be smooth and have a good protective layer. 4.3.2.31. The choice of working volume should be flexible: 4.3.3.4 In the dynamic volume method, the liquid is injected from the working volume chamber. 4.3.2.5 For the water meter after inspection, the scale line of the working volume meter shall be given as the volume value, and on the main scale line and the differential line at the bottom of the control cabinet,
4.4 Test user stop sign
4.4.1 The working position of the commutator (including the commutator) shall not be affected by the water flow and the diversion. At the same time, the influence of the force fluctuation on the display shall be minimized
4.4.2 The commutator is effective. The signal position of the commutator when starting and stopping the commutator, the nozzle position and the position of the commutator shall remain unchanged and marked
4.5 Data collection frame and control equipment
4.5.1 The data collection shall not affect the uncertainty of the device, 4.5.2 The control equipment shall have good operability. 4.5.3 The timing of the timer, the commutation of the commutator, the non-closing valve, the liquid level of the working volume meter and the white motion signal of the commutator shall be accurate and reliable.
5 Measuring equipment control
5.1 Calibration conditions
5.1.1 Standard equipment and instruments
5.1.1.1 The calibration standard weighing instrument shall have an uncertainty value better than the uncertainty of the full instrument. 5.1.1.2 The calibration working instrument shall use standard measuring instruments, whose uncertainty shall be better than the uncertainty of the full instrument. 1. The calibration working instrument shall have an uncertainty value better than the uncertainty of the full instrument. 5.1.1.3 The calibration timer shall have an uncertainty value better than the uncertainty of the full instrument. 5.1.2 Auxiliary equipment and receivers
5.1.2.1 Thermometer: The range is 0r~50%, and the scale value is 0.1.5.1.2.2 Stopwatch: The scale value is 0.5
5.1.2.3 The calibration time of the measuring instrument shall be within the range of 0r~50%, and the scale value is 0.1.5.1.2.3 The calibration time of the measuring instrument shall be within the range of 0r~50%, and the scale value is 0.1.5.1.2.4 Stopwatch: The scale value is 0.5
5.1.2.5 The flow meter used for demand stability test and start-stop effect test should have good stability, fast response speed, and pulse signal output: 5.1.3 Test medium
The test medium is single cabinet floating flushing water or the actual liquid used. 5.2 Test items and test methods
5.2.1 Appearance inspection
Check the appearance of the equipment with 11 square meters, and the results should meet the requirements of 3.1, 3.2., 3.2.2, 3.2.4, 3.3.3.44.1.4.3.4.4.
5.2.2 Sealing test
Start the equipment: Make the cabinet run: Use the dynamometer to check the various parts of the equipment, and the results should meet the requirements of 2,2.
5.2.3 Vibration 8-hour stability test
5.2.3.! 1. Connect the timer's external vibration signal to the timer. 5.1.3.2 After preheating for 1 hour, read the frequency value once every 1 hour, (H) (1-1, 2, 8), 5.2.3.3 Thermal stability
in: fia
maximum value, Hz:
minimum value, H
standard frequency value. H:
should be released according to 3.2.3 requirements
5.2.4 Timer verification
5.2.4.1 According to the use of the situation according to the timing and standard timing solution, and make a ten-hour start, the signal interval: with the shortest satellite measurement time (.) as the time, start and stop the timer, read the timing group value, (s) and the spherical timer value (), complete the first verification, and perform () second verification: 5.2.4.2 Timer uncertainty
second difference
ArEt,-c
flat angle
Class A relative standard uncertainty ||t t||B Relative standard uncertainty type
5.2.5 New instrument calibration
×100%
5.2.5.1 Take at least 10 evenly distributed points within the use limit (,-1, 2,, m, 310), use standard fast code to load from =1 to 1㎡, complete the first calibration: then load from =m to, ", complete the first calibration, record the loading quality, adjustment or quantity and instrument readings of the service points respectively, repeat, (w verification 1) change the calibration. 5,2.5.2 Instrument uncertainty
When negative (: R), the value of the product forbidden value Aw,= R.-(m, -Ru)
Wu Zhong: \, — standard standard code, kg; standard standard code, the reading of the scale at the first measurement, ksRnbZxz.net
R, — empty container, the average value of the number of measurements of the scale, kg1
, the average of the points
, the single measurement of Class A relative standard uncertainty [2(≤m, -A12
s2, -m, + ReL
) Class month relative standard uncertainty
2im,+Ro)×100%
4 Class cabinet relative standard uncertainty
Class B relative standard uncertainty
5.2.6 Workload determination
2 (52,)r
:= (n2j)m
5.2.6.1 1. When measuring, the number of calibration points of the reading part of the working instrument is generally not less than 3, and the ratio of the non-reading part volume of the working instrument to the volume of the standard instrument is generally not large! 5:1. 2.6.2 When cooling the standard measuring instrument, () according to the method of using the standard measuring instrument, the liquid in the standard solution is injected into the working instrument until the liquid level rises to the first calibration point selected by the single measuring instrument, and the liquid level value is read. Measure the air temperature (VII) and the working temperature (V) of the working display, and then select the appropriate measuring instrument with a certain limit to continue the inspection. (2, 3) The first inspection point, until the liquid level rises to the second working limit, record the liquid level value of the fixed point, and complete one inspection: repeat the inspection for the second time: (6)
5.2.6.3 The second measuring instrument is set at the same time. If the liquid temperature drops below (20±5), the volume V at the second point 20t is calculated according to the following formula.
V =V, [1- (01 -20) -2a2 (e2 -20) +3α: (0g-20h +2 (e-3)1 (12) where: —— calibration point, volume value of the standard instrument in the measuring instrument, : temperature becomes 8, service coefficient of the liquid, 100 million: linear connection coefficient of the working material, 1 yuan: a
linear expansion coefficient of the instrument material, 1 eight: expansion coefficient of the standard material, 1/. 5.2.0.4 Uncertainty of the working instrument
first; calibration point liquid level average position
where: L—-first, calibration point: second calibration filter position but: mn. Calibration point single measurement Class A relative standard uncertainty store 2r - t.2
Where: K
or K1.-..-
Single measurement of eight relative standards uncertainty vertical "3 (nm5.2.7 Reversing test
5.2.7.1 The internal device should be tested at the maximum flow rate, the use flow rate and the minimum flow rate, and the maximum of the flow rate at each point is taken as the commutator of the position. 5.2.7.2 Quick-change hood requirements detailed method for the same device should be determined, Flow meter control method:
According to the method of calibrating the flow meter, record the flow meter pulses once, and record the flow meter pulses according to the flow meter pulses. The flow meter pulses are effective. The commutator is operated within a relatively short time to make the commutator reverse. The commutator is changed to the value of 31 times, and the double display or time display is used to display the accumulated pulse number N. The flow meter is calibrated by electricity for w (w10) times, and the time difference is recorded: B, H2t2, and N, -1,2. NuN2B6s,)
The following are the values 4t, Class A standard uncertainty, and Class B relative standard uncertainty) calculated by (3), (41 and (, respectively.
Stroke difference method:
Adjust the flow rate to the full commutator calibration flow rate, set the width to 10min, operate the commutator, make the commutator change interval n (heart) times, and record the amount of steam in and out as (, 2
Average value
Class A relative standard uncertainty
Class B relative standard energy uncertainty
5.2.8 Stop verification
E rrim
- 32*5-2
×100%
5.2.8.1 The fixed storage effect is verified according to the station, the maximum flow rate, the commonly used standard quantity, and the minimum flow rate: take the small uncertainty quantity of the effect at each flow point as the basic uncertainty of the station effect, 5.2.8.2 The use of the wear effect verification is carried out according to the flow 1 verification method given in 5.2.7.2, f.
5.2.8.3 Automatic stop is prohibited A, average value At, Class A relative standard uncertainty 7 and Class B relative standard uncertainty store total: respectively install type (16), (3), (2) and (5 ) length calculation. 5.2.9 Dynamic effect verification
5.2.9.1 The dynamic effect verification is carried out at a rate of 1% at the maximum flow rate, the actual flow rate and the minimum flow rate. The maximum value of the uncertainty of the dynamic thermal effect at the flow point is taken as the uncertainty of the dynamic effect point at that position. 5.2.9.2 Mechanical scale or dynamic effect verification
Measure the displacement rate of the scale from the static position to the time when the timing is triggered (), and calculate the toughness of the scale (kg), the mass of the second receiving weight (kg), and the time between the measuring plates! () Dynamic effect uncertainty
(61.913/4m 123(m -Am)12-m 1
5.1.9.3 Dynamic effect verification of liquid level meter [electronic weighing instrument am
Gradually two liquid level sensors are fixed on the same level, so that the liquid level sensor moves downward when the liquid level rises, and the liquid level sensor moves downward when the liquid level reaches the static level, and the triggering time () is recorded respectively. 2 (): Dynamic effect uncertainty
5.2.20 Small uncertainty of device
5.2.10.1 Combined uncertainty of device
Inductive mass method
1+7×100%
n- (s+$+++ui+u?+?+ u?)
Standard magnetic code water deduction uncertainty.
Static dialysis device
n= (+++ + +
where: a
=(++++
relative uncertainty of standard recorder.
Dynamic mass spectrometry device
u=fs++++u+a
Dynamic volumetric method setting
Start-stop volumetric method device
= (++ + +)0
u- (s-s3+2--+u?)12
（++++
μ- (s+ $+ $+u+ +)12
For the hood with accumulated volume, the following equations (24) and (32): , and , are zero, 5.2.10.2 The expanded uncertainty of the installation is:
Formula: -
Get Gein width, - (), see Appendix A
5.2.11 Flow rate qualitative calibration
5.2.11.1 Carry out the calibration at the maximum flow rate and the minimum flow rate respectively, and take the value of flow stability as the flow rate stability of this station
5.2.11.2 According to the installation requirements, select the next ball core to perform flow stability calibration. (1) Flow rate stability calibration within cumulative time: record the output signal of the reaction flow rate at the end (=1, 2, 5R>60), half mean
relative error
correlation function
where.1,2,,n-1.
stability factor
,-91 21×100%
(2) Time-lapse flow rate stability calibration: EE
continuously measure (10) times the flow rate4 (=1, 3.
Stability
3.3 Handling of verification results
A verification certificate shall be issued to the qualified equipment; a verification result notice shall be issued to the unqualified equipment, and the unqualified items shall be indicated.
5.4 Verification cycle
The verification period of water meter verification equipment is generally not more than 2 years, and the verification period of other equipment is generally not more than 3 years.
1) (Uncertainty confidence level 95%) 12.7
Combined with the following formula
Where:
Compound uncertainty of the equipment:
Class A or Class B is marked as uncertainty;
is the uncertainty.
Appendix B
Precautions for use
.1 The working capacity of the scale should be used according to the limits and air temperature given in the calibration certificate. B.2 The full scale reading R should be corrected according to the following formula:
Where: n—mass after correction, sg:
Air temperature, k/m:
Fluid volume correction during use, kg/m:
Standard code used when calibrating the scale, mB.3 When the working capacity of the scale is outside the range (20=5), the working capacity reading V should be corrected according to the following formula: Va = Var. + 3(6 -20)]
The volume after repair, n;
Where: Vx
Working instrument material body system effect, 1/
The temperature of the liquid in the working instrument, seven,
Verification certificate section page format
Method flow ()
Product determination (first:
+Time instrument
A class must library small also grams (tea)
Class standard uncertainty ()
Type (name instrument)
K(/nn )
release competition between mountains (.)
A class international standard uncertainty (%)
F class sample standard uncertainty skin%
or dynamic release 2
or self-harvest
quantity buttocks qualitative (%) (pulling agent;
and landscape flower use L)
most most (s
device uncertainty (%)
control medium:
cause: point one
customer:
A wide standard production ten - South melon ()
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