Some standard content:
JJG586-2006
Verification Regulation of SoapFilm Flow meter
JJG586—2006
Replaces JJG586-1989
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on September 6, 2006, and came into force on March 6, 2007.
(Yougaogan City, Beijing)
Tairuhui Tianhao
Responsible unit: National Technical Committee for Flow and Capacity Measurement Main drafting unit: Beijing Institute of Metrology and Testing Science, China Institute of Metrology
Participating drafting unit: Zhejiang Institute of Quality and Technical Supervision and Testing Liaoning Institute of Metrology
Qingdao Hengyuan Instrument Co., Ltd.
Shenyang Beixing Flow Meter Factory
Wuhan Tianhong Intelligent Meter Factory
This regulation entrusts the National Technical Committee for Flow and Capacity Measurement to interpret this regulation Main drafter:
Xu Yinghua
Yang Youtao
Participating drafter:
Shen Wenxin
Wang Buzheng
Li Hongjie|| tt||JJG586-2006
Caijiajingliufang
(China Institute of Metrology)
(Beijing Institute of Metrology and Testing Science) (Zhejiang Quality and Technical Supervision Testing Institute) (Liaoning Institute of Metrology)
(Qingdao Hengyuan Instrument Co., Ltd.)
(Shenyang Beixing Flow Meter Factory)
0.0月8年1000
(Beijing Institute of Metrology and Testing Science) (Wuhan Tianhong Intelligent Meter Factory)
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same company Foreign capital of the instrument
Beijing City
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#True Wind Member Committee Maximum Ten Card Capacity National Commission Placement of Finance 1 Scope·
2 References…·
3 Overview
3.1 Purpose·
3.2 Structural type
3.3 Working principle
4 Metrological performance requirements
4.1 Accuracy grade and maximum allowable error
4.2 Repeatability
5 General technical requirements,
5.1 Appearance·
5.2 Technical requirements·
6 Control of measuring instruments
6.1 Type evaluation
JG5862006
Catalog
6.2 First Verification, subsequent verification and in-use inspection 6.3 Handling of verification results
6.4 Verification cycle
Appendix A Outline for type evaluation
Appendix B Soap film gas flow standard device
Appendix C Additional conditions for 0.5-level flowmeter
Appendix D Additional error of soap film flowmeter
Appendix E Distilled water density table
Appendix F Specifications and reference dimensions of soap film tubes
Appendix Gd value table
Appendix H Format of the inner pages of the verification certificate and verification result notice (1)
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(2)
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JJG586-2006
Chinese
Guide
Verification procedures for soap film flowmeters
Electrical and physical road note generation equipment technology
1 Scope
International
This regulation applies to the type evaluation (prototype test), initial verification, subsequent verification and in-use inspection of soap film flowmeters.
2 References
The provisions contained in the following standards and regulations constitute the provisions of this regulation through reference. JJF1015-2002 General specification for type evaluation and type approval of measuring instruments JJF1016-2002 Guidelines for compiling outlines for type evaluation of measuring instruments GB/T12810-1991 Capacity calibration and use methods of laboratory glass instruments JB/T9329-1999 Basic environmental conditions and test methods for transportation and storage of instruments GB/T17626.2-1998 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test When using this procedure, attention should be paid to using the current valid versions of the above-mentioned references. Request for technical information
3 Overview
3.1 Purpose
Lanmei Daida Chang Geng Mei
Soap film flowmeter (hereinafter referred to as flowmeter) is a flowmeter for measuring small gas flow. It can be divided into direct reading glass tube soap film flowmeter (hereinafter referred to as soap film flowmeter) and soap film flowmeter with a pair of electronic sensors installed on the soap film tube (hereinafter referred to as electronic soap film flowmeter). The maximum flow rate of direct-reading glass tube soap film flowmeter is generally 12L/min. The maximum flow rate of electronic soap film flowmeter is generally 60L/min. When the soap film flowmeter needs to be used as a device, it should comply with the relevant provisions of Appendix B.
3.2 Structural type
Infinite-substance-electric-conversion
The soap film flowmeter is a soap film tube with a scale, with an air inlet below the soap film tube, and a rubber ball at the bottom of the soap film tube, which contains soap film liquid. The electronic soap film flowmeter is equipped with a lower limit sensor and an upper limit sensor on the outer wall of the soap film tube and a display instrument. The structure of the soap film flowmeter is shown in Figure 1, and the structure of the electronic soap film flowmeter is shown in Figure 2. 3.3 Working Principle As shown in Figure 1 and Figure 2, the working principle of the soap film flowmeter is that the gas flowing out of the air source passes through the flow regulating valve 1
JJG586-2006
, and after being adjusted to the required flow, it enters the soap film tube from the air inlet at the lower end of the soap film tube, squeezes the rubber ball (or uses other methods) to produce soap film, and due to the pressure of the intake air, the soap film is pushed to rise rapidly along the soap film tube. When the soap film rises to the lower scale line of the soap film tube, the timer starts timing, and when the soap film rises to the upper scale line of the soap film tube, the timer stops timing. The instantaneous flow through the flowmeter can be calculated by the measured time and the volume between the two scale lines of the soap film tube. For the electronic soap film flowmeter, when the soap film rises, it passes through the lower limit and upper limit of a pair of sensors installed on the outer wall, and the display instrument directly displays the instantaneous flow. The display instrument can also display the set parameters (such as volume, temperature, atmospheric pressure, etc.). Upper limit sensor
Wencha Lianxian Baoxie City Niu Mao Anxing
Kecai Yongtong Fangbiyong
Xianzao Style
Timer
Guowei Wen Volume Increasing Device Volume Efficiency Device
Soap Film Tube
Figure! Schematic diagram of the structure of soap film flowmeter
Quantity has been formed
1234567.89
Lower limit sensor
Display instrument
0Q-O18T
Figure 2 Schematic diagram of the structure of electronic soap film flowmeter
This article
4 Measurement performance requirements
4.1 Accuracy grade and maximum allowable error
The accuracy grade and maximum allowable error of the flowmeter shall not exceed the provisions of Table 1. Table 1 Accuracy grade and basic error limit of flowmeter Accuracy grade Maximum allowable error (%) 4.2 Repeatability The repeatability of the flowmeter shall not exceed half of the maximum allowable error specified in Table 1. 5 General technical requirements 5.1 Appearance 5.1.1 The top of the soap film tube of the soap film flowmeter shall be permanently engraved with the manufacturer (or trademark), standard temperature 20℃, specification and unit (the unit shall be "mL") and product number. 5.1.2 The nameplate of the electronic soap film flowmeter should be designed on the back or in a conspicuous position. The nameplate should be marked with the manufacturer (or trade mark), model specification, flow range, product number, accuracy level, and manufacturing license mark. 5.1.3 The display instrument of the electronic soap film flowmeter should have clear handwriting and no phenomenon that hinders reading. 5.1.4 The buttons on the panel of the electronic soap film flowmeter should have a moderate feel and be flexible and reliable. 5.1.5 The measurement unit of the electronic soap film flowmeter display instrument is mL/min or L/min. 5.1.6 Requirements for the engraving of the soap film tube
5.1.6.1 Various specifications of soap film tubes should have at least two or three volume scales (including volume values), namely zero, upper limit and 12 upper limit.
5.1.6.2 The scale width and length should comply with the provisions of Table 2. Table 2 Scale width and length
Soap film tube specifications/mL
10--1000
1500--6000
Scale width/mm
Scale length
1/4 of the diameter of the soap film tube
5.1.6.3 The ratio of the height difference between the upper and lower scales of the soap film tube to the inner diameter of the soap film tube should be greater than 20:1. 5.1.6.4 The volume number on the soap film tube should be clear and neat, and the scale should be uniform in thickness and perpendicular to the axis. 5.2 Technical requirements
5.2.1 The shortest measurement time of the flow meter is 30s. 5.2.2 Specifications and reference dimensions of flowmeters are shown in Appendix F5.2.3 Materials of flowmeters
The materials of flowmeters shall be made of colorless and transparent borosilicate glass, and the interfaces of all parts shall be smooth5.2.4 The air inlet of the soap film flowmeter shall be on the left or right side of the scale line. 5.2.5 The photoelectric sensor installed on the electronic soap film flowmeter shall be firm and reliable, and shall not move up and down. 5.2.6 The parts of the electronic soap film flowmeter shall be complete, undamaged, reliably connected, and well sealed5.2.7 Requirements for soap film liquid
5.2.7.1 The main component of soap film liquid is non-ionic surfactant. After the soap film liquid is dissolved in water, it shall not be stratified, coagulated, or turbid within (20 ± 5) ℃.
5.2.7.2 The soap film liquid is mixed with detergent or other solvents and water, and the ratio shall be appropriate. 5.2.8 Gas source requirements
The gas used for calibration should be clean, and the gas source pressure should be stable. The gas source pressure fluctuation should be less than 100Pa5.2.9 Sealing requirements
JJG5862006
During calibration, it is necessary to check all connections of the flow meter, and there should be no leakage. 6 Measuring instrument control
Measuring instrument control includes type evaluation, initial calibration, subsequent calibration and in-use inspection. 6.1 Type evaluation
Type evaluation (prototype test) should be carried out in accordance with JIF1015-2002 "General Specifications for Type Evaluation and Type Approval of Measuring Instruments" and JJF1016-2002 "Guidelines for Writing Type Evaluation Outlines of Measuring Instruments". The outline of type evaluation is shown in Appendix A.
6.2 Initial calibration, subsequent calibration and in-use inspection 6.2.1 Calibration conditions
6.2.1.1 Calibration environmental conditions
Ambient temperature: 10℃~25℃;
Relative humidity: (30～80)%;
Atmospheric pressure: 86kPa~106kPa.
6.2.1.2 Calibration medium
(1) The calibration medium used for volumetric calibration of soap film flowmeter is distilled water. During a calibration process, the water temperature and room temperature are required to change less than 0.5℃.
(2) The calibration medium of electronic soap film flowmeter is air. During a calibration process, the air temperature and room temperature are required to change less than 0.5℃.
6.2.2 Calibration instruments and equipment
6.2.2.1 The calibration instruments and equipment for soap film flowmeter are shown in Table 3. Table 3 Instruments and equipment for calibration of soap film flowmeter
Instrument name
Thermometer
Pressure gauge
Timer
Reading range
(0--50)
(0~1000) Pa
(1~999)s
Technical requirements
Graduation value 0.2℃
Graduation value 0.1mg
Graduation value Img
Graduation value 0.01g
Graduation value 0.1g
JJG5862006
6.2.2.2 Instruments and equipment for calibration of electronic soap film flowmeter are shown in Table 4. Table 4 Instruments and equipment for verification of electronic soap film flowmeter Instrument name
Bell-type gas flow standard device
Soap film gas flow standard device
Pressure gauge
Thermometer
6.2.3 Verification items
Measuring range
(01000)Pa
(0--50)C
Technical requirements
The verification items of soap film flowmeter are shown in Table 5, including initial verification, subsequent verification and in-use inspection. Table 5 Verification items
Verification items
Appearance inspection
Sealing test
Verification of soap film tube volume
Basic error
Repeatability
Initial verification
Note: "+" indicates items to be inspected; "_" indicates items that may not be inspected. 6.2.4 Verification procedure and verification method
6.2.4.1 Appearance inspection
Subsequent verification
The appearance inspection of the flowmeter shall be carried out by visual inspection, and the result shall meet the requirements of 5.1. 6.2.4.2 Leakage test
Inspect the connection pipes of the soap film flowmeter, which shall not leak under the verification conditions. In-use inspection
Connect the inlet of the electronic soap film flowmeter to the air source and the outlet to the standard instrument, and check the connection pipes, which shall not leak.
6.2.4.3 Verification method of soap film flowmeter
(1) Before verification, the soap film tube shall be cleaned with cleaning liquid, and then rinsed with tap water and steamed stuffing water in turn. 5
JJG586—2006
(2) The drainage time of the soap film tube during calibration is shown in Table 6 Table 6 Drainage time of soap film tube
Specifications of soap film tube/mL
Drainage time/s
10-100
60--80
150-~1000
100-120
1500~6000
150~200
(3) The inner surface of the soap film tube should be kept moist and uniform, and the curved liquid surface at the edge should not be wrinkled or deformed. (4) When observing the liquid surface, the lowest point of the curved liquid surface is required to be horizontally tangent to the upper edge of the scale line, and the observer's line of sight must be on the same level as the scale line.
(5) The volumetric calibration of the soap film tube of the soap film flowmeter is carried out by mass method, and the pipeline connection is shown in Figure 3. (6) Take a clean beaker with a volume slightly larger than that of the soap film tube and place it on an electronic balance to weigh the mass of the beaker. (7) The distilled water in the soap film tube is discharged into the beaker according to the time specified in Table 6. The total mass of the beaker is weighed and the mass of the beaker is subtracted to obtain the mass of the water M.
(8) The volume value of the soap film tube at 20℃ is calculated from the mass of water M. The calculation formula is V, - Mc, [1 + β (20 - 0)
Where: V - actual volume at 20℃, mL; C - buoyancy correction coefficient;
- borosilicate glass volume expansion coefficient (1.6 × 105/C); pr - magnetic code material density (unified agreed density value 7.999g/cm2); e - actual density of distilled water at the calibration temperature, g/cm2; Pa - air density (generally p. = 0.0012g/cm2); 9 - temperature of distilled water, ℃
(9) Repeat the calibration according to the procedure of Article (7) of 6.2.4.3, and the number of calibrations shall not be less than 3 times. (10) Volume error Ev of soap film tube Where: V20 is the nominal volume value of soap film tube. V.-Va×100% (11) Take the average value of multiple measurements as the volume error Ev of soap film tube. (12) For newly manufactured soap film flowmeters, JIG 586-2006 is the volume error of soap film tubes. If the volume error of soap film tube exceeds the distilled water, the flat end of ... The used soap film should be based on the actual value of the calibration. However, if the actual value of the calibration HO
is offset by more than 2% or 5m compared with the standard value, it is judged as unqualified. an
Soap film tube quality
Alarm (mL))
Three nozzle volume
Allowable error
6.2.4.4 The maximum allowable error E, CE
of the soap film flowmeter: E——Error in electronic seconds
E—Additional error (see Appendix D)
6.2.4.5 Method for repeating
H of soap film flowmeter
METROL
150~6000
Paitong City Fruit Group
In the formula: EvmsxEvmin——
respectively the maximum and minimum volume errors in each calibration; d.——Range coefficient.
E is the repeatability of the soap film flowmeter, and the result should meet the requirements of 4.2. 6.2.4.6 Verification method of electronic soap film flowmeter (5)
（1）The standard instrument used for verification should have a valid verification certificate, and its accuracy should be better than 1/2 of the maximum allowable error of the flowmeter under test.
JJG 586-2006
（2）The supporting equipment used for measuring data and participating in error calculation must have a valid verification certificate or calibration certificate. Its technical requirements should meet the requirements of Table 4. (3) Pressure measurement
Measure the gas pressure flowing through the electronic film flowmeter under test, and the pressure measurement position should be on the upstream side of the flowmeter. (4) Temperature measurement
Measure the gas temperature flowing through the electronic soap film flowmeter under test, and the temperature measurement position should be on the upstream side of the flowmeter. (5) Volume value correction
a) First, place the electronic soap film flowmeter vertically on the calibration table. In the flow range of the newly manufactured electronic soap film flowmeter, 0.59mx should be selected for calibration. Use the regulating valve to slowly adjust the flow rate, and then squeeze the rubber ball on the soap film tube to make it a complete film that rises with the air flow. b. Use a standard to calculate the flow rate and compare it with the indicated flow rate of the flowmeter. The calculation formula is va×273.15+oxp+p×V
q×273.15+8g×patpm
Where: V
The corrected volume value in the newly placed flowmeter, mL or LV. —The original volume value placed in the electronic soap film flowmeter, mL or L; q
The indicated value of the electronic soap film flowmeter, mL/min or L/min: The flow value measured by the standard instrument, ml/min or L/min; G
0 is the temperature of the standard instrument and the electronic soap film flowmeter, ℃; pa, pa, Pm are the atmospheric pressure, the pressure of the standard instrument and the electronic soap film flowmeter, Pa ②) The volume value shall be calibrated for no less than 3 times, and the average value shall be taken as the corrected volume value. (6) Verification of indication error
a) The corrected volume value shall be placed in the electronic soap film flowmeter, and at least 3 evenly distributed flow points (including the upper and lower flow limits) shall be selected within its flow range for verification, and the verification times for each flow point shall be no less than 3 times. Record the indicated flow rate of the flowmeter, and calculate the flow rate of the standard instrument using the following formula: V.273.15 + om×p.+p
qs=×273.15+0×p.+pm
Wherein: 9.——Flow rate value flowing through the standard instrument during calibration, mL/min or L/min; V.——Volume value of the standard instrument, mL or L; t——Time flowing through the standard instrument during calibration, s;
pa, pe, pm——Respectively represent atmospheric pressure, pressure of the standard instrument and electronic soap film flowmeter, Pa;
JJG586—-2006
0m0——Respectively represent the gas temperature of the electronic soap film flowmeter and the standard instrument during calibration, ℃. A
b) During subsequent calibration, if the volume coefficient cannot be corrected, the indication error calibration shall be carried out according to the original volume coefficient. 6.2.4.7 Maximum allowable error of electronic soap film flowmeter a) The indication error of electronic soap film flowmeter for single measurement ELEL = m—±×100%
Where: qm——indication value of electronic soap film flowmeter, mL/min or L/min; q. Flow value converted from standard instrument to electronic soap film flowmeter state, mL/min or L/min. b) The maximum allowable error of electronic soap film flowmeter is calculated according to formula (9) The maximum allowable error of electronic soap film flowmeter EEd = (E +E2)1/2
Where: E is the accuracy of a standard instrument. If it does not exceed 1/3 of the maximum allowable error of the flowmeter under test, it can be ignored.
) The maximum indication error of a single measurement of each flow point is the maximum allowable error of the electronic soap film flowmeter, and the result should meet the requirements of Section 41.
6.2.4.8 Repeatability E. Calculation
a) Repeatability of each flow point of the electronic soap film flowmeter (E2) (E,)uax -(E)nin
Where: (E)mx (E)m- are the maximum error and minimum error of the flow point respectively. (10)
b) The maximum value of the repeatability of all flow points is the repeatability of the electronic soap film flowmeter, which should meet the requirements of 4.2. 6.3 Processing of calibration results
6.3.1 The soap film flowmeter can be calibrated in sections, such as calibrating two half-scales or the full scale and the lower half-scale, and the maximum allowable error and repeatability are calculated according to the calibrated flowmeter range. 6.3.2 The maximum allowable error of the electronic soap film flowmeter shall be given. 6.3.3 A verification certificate shall be issued to the flowmeters that meet the requirements of this regulation after verification. 6.3.4 A verification result notice shall be issued to the flowmeters that fail the verification, and the unqualified items shall be indicated. 6.4 The verification cycle shall generally not exceed 3 years for soap film flowmeters and 2 years for electronic soap film flowmeters.The flow value of the standard instrument converted to the state of the electronic soap film flowmeter, mL/min or L/min. b) The maximum allowable error of the electronic soap film flowmeter is calculated according to formula (9) The maximum allowable error of the electronic soap film flowmeter EEd = (E + E2)1/2
Where: E, is the accuracy of the standard instrument. If it does not exceed 1/3 of the maximum allowable error of the flowmeter under test, it can be ignored.
) The maximum indication error of a single measurement at each flow point is the maximum allowable error of the electronic soap film flowmeter, and the result should meet the requirements of Section 41.
6.2.4.8 Calculation of repeatability E.
a) Repeatability of each flow point of the electronic soap film flowmeter (E2) (E,)uax -(E)nin
Where: (E)mx (E)m-are the maximum error and minimum error of the flow point respectively. (10)
b) The maximum value of the repeatability of all flow points is the repeatability of the electronic soap film flowmeter, which should meet the requirements of 4.2. 6.3 Processing of calibration results
6.3.1 The soap film flowmeter can be calibrated in sections, such as calibrating two half-scales or the full scale and the lower half-scale, and the maximum allowable error and repeatability are calculated according to the calibrated flowmeter range. 6.3.2 The maximum allowable error shall be given for the electronic soap film flowmeter. 6.3.3 A calibration certificate shall be issued to the flowmeter that meets the requirements of this regulation after calibration.
6.3.4 A calibration result notice shall be issued to the flowmeter that fails the calibration, and the unqualified items shall be indicated. 6.4 The calibration cycle
The soap film flowmeter is generally not more than 3 years; the electronic soap film flowmeter is generally not more than 2 years. Zhongyuan
要意娱零The flow value of the standard instrument converted to the state of the electronic soap film flowmeter, mL/min or L/min. b) The maximum allowable error of the electronic soap film flowmeter is calculated according to formula (9) The maximum allowable error of the electronic soap film flowmeter EEd = (E + E2)1/2
Where: E, is the accuracy of the standard instrument. If it does not exceed 1/3 of the maximum allowable error of the flowmeter under test, it can be ignored.
) The maximum indication error of a single measurement at each flow point is the maximum allowable error of the electronic soap film flowmeter, and the result should meet the requirements of Section 41.
6.2.4.8 Calculation of repeatability E.
a) Repeatability of each flow point of the electronic soap film flowmeter (E2) (E,)uax -(E)nin
Where: (E)mx (E)m-are the maximum error and minimum error of the flow point respectively. (10)
b) The maximum value of the repeatability of all flow points is the repeatability of the electronic soap film flowmeter, which should meet the requirements of 4.2. 6.3 Processing of calibration results
6.3.1 The soap film flowmeter can be calibrated in sections, such as calibrating two half-scales or the full scale and the lower half-scale, and the maximum allowable error and repeatability are calculated according to the calibrated flowmeter range. 6.3.2 The maximum allowable error shall be given for the electronic soap film flowmeter. 6.3.3 A calibration certificate shall be issued to the flowmeter that meets the requirements of this regulation after calibration.
6.3.4 A calibration result notice shall be issued to the flowmeter that fails the calibration, and the unqualified items shall be indicated. 6.4 The calibration cycle
The soap film flowmeter is generally not more than 3 years; the electronic soap film flowmeter is generally not more than 2 years. Zhongyuan
要意娱零
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