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Mechanical Industry Standard of the People's Republic of China
JB/T6800-93
Compensated Micromanometer
Published on July 9, 1993
Implemented on January 1, 1994
Ministry of Machinery Industry of the People's Republic of China
1 Subject Content and Scope of Application
Mechanical Industry Standard of the People's Republic of China
Compensated Micromanometer
JB/T6800-93
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of compensated micromanometers. This standard applies to compensated (type) micromanometers (hereinafter referred to as micromanometers) with a measuring range of -1.5~0, 0~1.5kPa; -2.5~0, 0~2.5kPa.
2 Reference standards
GB1146 Level bubble
ZBY002
ZBY003
3 Product classification
Basic environmental conditions and test methods for transportation and storage of instruments and meters General technical conditions for packaging of instruments and meters
3.1 Type: direct reading
3.2 Micromanometers are divided into first-class and second-class according to their accuracy. 3.3 Micromanometers are scaled in millimeters, and the pressure value is determined by calculation. 3.4 The measurement range and minimum grid spacing of micromanometers should comply with the provisions of Table 1. Table 1
YJB-1500wwW.bzxz.Net
YJB-2500
4 Technical requirements
4.1 Normal working conditions
a, ambient temperature is 10～30℃;
b, relative humidity should not be greater than 80%;
c. Working medium: pure water.
4.2 Reference working conditions
Measuring range
Minimum grid spacing
Under the following conditions, the basic error, zero alignment error and zero return error of the micromanometer shall comply with the relevant provisions. a. The instrument is in the normal working position;
b. The load changes evenly;
c. Ambient temperature:
Approved by the Ministry of Machinery Industry on July 9, 1993
Implemented on January 1, 1994
JB/T6800-93
First grade is 20±1℃, and the temperature fluctuation does not exceed ±0.5℃; second grade is 20±2℃. The temperature fluctuation does not exceed ±1℃. d. The relative humidity is not more than 80%;
e. The workbench should not vibrate.
4.3 Basic error
The basic error of the micromanometer is expressed by absolute error, and its indication basic error limit should not exceed the provisions of Table 2. Table 2
Measuring range
YJB-1500
YJB-2500
4.4 Zero point alignment error
-2.5~<-1.5
The zero point alignment error of the micromanometer shall not exceed the provisions of Table 3. Table 3
Accuracy
4.5 Zero point return error
The zero point return error of the micromanometer shall not exceed the provisions of Table 4. Table 4
Accuracy
4.6 Sealing
Maximum allowable value
Maximum allowable value
The micromanometer shall not have a drop in indication under the test load for 5 minutes. The test load shall be as specified in Table 5. Table 5
Measurement range
4.7 Mechanical zero point
Basic error limit
Test load
The scale zero point of the vertical scale and the rotating scale of the micromanometer should be consistent. When the load of the micromanometer is zero and the vertical scale is at the zero point line, the deviation of the rotating scale dial from the zero point should not be greater than 0.2mm. 4.8 Reading device
4.3.1 The reading tip of the micromanometer should not have burrs, skewness, or mold moisture when observed in the convex lens and reflector. 2
JB/T6800-93
4.8.2 The rotating scale of the micromanometer should rotate flexibly, and there should be no sticking or looseness when rotating. 4.9 Level device
The micromanometer should have a leveling device and a level adjustment device. The level bubble used in the leveling device should be selected from the circular level bubble specified in GB1146, and its nominal angle value should not exceed 15 minutes. 4.10 Appearance
The protective layer of the micromanometer parts should be uniform and should not have defects such as peeling and rust. 4.11 Anti-transport environment performance
The micromanometer should be able to withstand the test specified in ZBY002 under packaging conditions, including: a. High temperature is 40℃;
b. Low temperature is -25;
c. Free fall height is 100mm;
d. Relative humidity is exempted.
After the test, it should comply with the provisions of Articles 4.3 to 4.6 of this standard. 5 Test method
The inspection order is in accordance with Appendix A (supplement).
5.1 Basic error inspection
5.1.1 Test conditions
According to the reference working conditions in Article 4.2.
5.1.2 Working medium
The working medium shall be in accordance with the provisions of Article 4.1.
5.1.3 Standard instrument
The ratio of the absolute value of the basic error limit of the micromanometer used for inspection to the absolute value of the basic error limit of the micromanometer under inspection shall not be greater than that specified in Table 6. Table 6
Accuracy
5.1.4 Inspection points
The inspection points of the micromanometer shall be no less than 11 points and shall be evenly distributed in the measurement range. 5.1.5 Inspection method
aInspection shall be carried out by comparing the micromanometer under inspection with the standard (reference) instrument. Allowable ratio
b. The micromanometer under inspection and the standard (reference) instrument shall be placed under the reference working conditions of Article 4.2 for 2 hours before inspection. c. During inspection, the tip of the reading observed from the reflector shall be as close as possible to the virtual image on the horizontal plane, but not touching. d. Connect the micromanometer to be tested and the standard (reference) instrument with the three-way pipe nozzle and the pressure source to form a test system. First adjust the level of the micromanometer, slowly increase and decrease the pressure several times, and remove the air in the connecting pipe; then adjust the zero point, and then steadily increase the load from the zero point, and at the same time test the specified test points to the upper limit of measurement, and then steadily reduce the load to test each test point to zero. The basic error of each test point shall comply with the provisions of Article 4.3.
e, the height of the water column in the test is read in millimeters, and the corresponding pressure value is determined by the following formula: P=h·gp(1-1
Wherein: P—measured pressure (kP):
h-—instrument indication reading (mm):
JB/T6800-93
g—gravitational acceleration in the use (test) area (m/s\), see Appendix B (supplement); p
-density of pure water at the use temperature (kg/m\): see Appendix C (supplement); p\-air density at the use (test) ambient temperature (kg/m\), determined by the following formula: p\=C,HX10-2...|| tt||H. Atmospheric pressure during use (test) (kPa) C. ——Conversion coefficient of air density, atmospheric pressure and ambient temperature (m-2: s\), see Appendix D (supplement). 5.2 Zero point alignment error test
·(2)
On the zero point scale line, make the reading tip as close as possible to the virtual image on the horizontal plane but not touching, adjust the zero point liquid level, and then slowly turn the fine-tuning dial to raise the liquid level to a certain value and then drop it to the zero point liquid level to realign the reading tip. Read the deviation value on the rotating scale, and repeat this five times. The maximum value in the reading is the pressure value calculated using formula (1), which is the zero point alignment error. 5.3 Zero point return error test| |tt||After the basic error test, connect the pressure source nozzle of the micromanometer to the atmosphere, rotate the fine-tuning dial so that the tip of the reading is as close as possible to the virtual image of the horizontal plane but not in contact. The pressure value indicated by the rotating scale is calculated using formula (1), which is the zero-point return error. 5.4 Leakage test
This is carried out when the working medium is not filled. Use a three-way nozzle, pressure source, detection micromanometer, and the micromanometer to be tested to form a test system. Add load so that the detection micromanometer reading reaches the pressure specified in Article 4.6. Continue for 5 minutes and then start observing the detection micromanometer reading. There should be no drop until 10 minutes.
The detection micromanometer should have an accuracy level of not less than 1.5. Cup-shaped or U-shaped pressure gauge suitable for the range. 5.5 Mechanical zero point
After aligning the slider in the vertical scale to the zero point, observe the deviation between the rotating scale and the zero point. It should meet the requirements of Article 4.7. 5.6 Reading device inspection
Turn the rotating scale, observe the image of the reading tip, and use the hand to check the flexibility of the scale when rotating. 5.7 Horizontal device inspection
Visual inspection, and check whether the level bubble meets the requirements of GB1146. 5.8 Appearance inspection
Visual inspection.
5.9 Transport environment resistance performance test
Perform the test in accordance with ZBY002. After the test, follow 5.1~5.3. 6 Inspection rules
6.1 Factory inspection
6.1.1 Inspection items and sampling
Micromanometers shall be inspected one by one according to the requirements of 4.3 to 4.10 and 7.1 of this standard and the corresponding test methods. 6.1.2 Judgment rules
A single micromanometer can be judged as a qualified product only after it meets the inspection items specified in Article 6.1.1. A micromanometer can only be shipped after it has passed the inspection and is accompanied by a certificate of conformity.
6.2. Type inspection
6.2.1 Inspection conditions and contents
In any of the following cases, the micromanometer shall be subjected to type inspection in accordance with all technical requirements and test methods of this standard: a. Trial production of new products or old products transferred to the factory for production; b. Periodic inspection of micromanometers produced in batches; c. When there are major changes in design, process, materials, etc. that affect product performance; d. When the micromanometer that has been discontinued is produced again; 4
6.2.2 Sampling and judgment rules
JB/T6800-93
6.2.2.1 In cases a, c, and d of Article 6.2.1 of this standard, the sampling shall be no less than three units. The type inspection can be judged to have passed only when all inspection items meet the requirements of this standard.
6.2.2.2 In case of b in 6.2.1 of this standard, the following provisions shall apply: a. A random sampling is adopted, and a group of samples consists of four micromanometers. The mother body when the samples are taken should be no less than 10. b. For a single sample, when there are defects in the items of visual inspection that do not affect the basic functions of the micromanometer and thus fail to meet the provisions of the standard, the micromanometer can be judged as a qualified product. If there are more than three (including three) micromanometers in a group of samples that have the same type of defects, the type test is judged to have failed.
c. Only when all four micromanometers are qualified can the type test be judged to have passed. 7 Marking, packaging and storage
7.1 Marking
7.1.1 Each micromanometer shall have a nameplate, which shall generally include the following information: a. Product name;
b. Product model;
c. Accuracy;
d. Measuring range;
e. Manufacturer's name or trademark;
f. Year of manufacture and factory number.
7.1.2 The instrument or its manual or packaging shall be marked with the code, number and name of this standard. 7.2 Packaging
The packaging of the micromanometer shall comply with the provisions of ZBY003, and the packaging protection type shall be determined by the manufacturer. 7.3 Storage
The micromanometer shall be stored in a well-ventilated room without corrosive gases. 5
JB/T6800-93
Appendix A
Test sequence
(Supplement)
Reading device, level device, appearance, marking and sealing
Mechanical zero point
Zero point alignment error
Basic error
Zero point return error
Anti-transport ring increase performance
Parking at reference temperature
Not less than 2h
Harbin
Zhangjiakou
Shijiazhuang
JB/T6800-93
Appendix B
Gravity acceleration of major regions in China
(Supplement)
Gravity acceleration
Ulanliha
Hailar
Urumqi
Ulanhot
Jiamusi
Shedanjiang
Turpan
Qiqihar
Shanhaiguan
Gravity acceleration
JB/T6800-93
Note: The gravity acceleration values of areas not listed in this table can be calculated using the following formula: 9.80665×(1-0.00265×cos2Φ)gho
1+2h/R
Where: Latitude of the additional measurement point:
R-the radius of the earth, equal to .6371×10°mh-the altitude of the measurement location.
Appendix C
Density table of pure water under standard atmospheric pressure (supplement)
997:04
p,kg/m
Additional notes:
JB/T6800-93
Appendix D
Conversion coefficient of air density, atmospheric pressure and ambient temperature (supplement)
This standard is proposed and managed by Xi'an Industrial Automation Instrumentation Research Institute. This standard is drafted by Xi'an Industrial Automation Instrumentation Research Institute. The main drafters of this standard are: Wang Xiuzhen, Cheng Zhesheng, Chen Limin. Temperature
People's Republic of China
Mechanical Industry Standard
Compensated Micromanometer
JB/T6800-93
JB/T6800--93
Published by the Institute of Comprehensive Technical and Economic Research of Instruments and Meters, Ministry of Machinery Industry; Printed by the Printing Service Department of Beijing Machinery Enterprises Association
Issued by the Institute of Comprehensive Technical and Economic Research of Instruments and Meters, Ministry of Machinery Industry★
First edition in March 1995
First printing in March 1995
Cost: 5.00 yuan00265×cos2Φ）gho
1+2h/R
Where:
Latitude of the measuring point:
R——radius of the earth, equal to .6371×10°mh——the altitude of the measuring place.
Appendix C
Density table of pure water under standard atmospheric pressure (supplement)
997:04
p,kg/m
Additional instructions:
JB/T6800-93
Appendix D
Conversion coefficient of air density, atmospheric pressure and ambient temperature (supplement)
This standard is proposed and managed by Xi'an Industrial Automation Instrumentation Research Institute. This standard is drafted by Xi'an Industrial Automation Instrumentation Research Institute. The main drafters of this standard are: Wang Xiuzhen, Cheng Zhesheng, and Chen Limin. Temperature
People's Republic of China
Mechanical Industry Standard
Compensated Micromanometer
JB/T6800-93
JB/T6800--93
Published by the Institute of Comprehensive Technical and Economic Research of Instruments and Meters, Ministry of Machinery Industry; Printed by the Printing Service Department of Beijing Machinery Enterprises Association
Issued by the Institute of Comprehensive Technical and Economic Research of Instruments and Meters, Ministry of Machinery Industry★
First edition in March 1995
First printing in March 1995
Cost: 5.00 yuan00265×cos2Φ）gho
1+2h/R
Where:
Latitude of the measuring point:
R——radius of the earth, equal to .6371×10°mh——the altitude of the measuring place.
Appendix C
Density table of pure water under standard atmospheric pressure (supplement)
997:04
p,kg/m
Additional instructions:
JB/T6800-93
Appendix D
Conversion coefficient of air density, atmospheric pressure and ambient temperature (supplement)
This standard is proposed and managed by Xi'an Industrial Automation Instrumentation Research Institute. This standard is drafted by Xi'an Industrial Automation Instrumentation Research Institute. The main drafters of this standard are: Wang Xiuzhen, Cheng Zhesheng, and Chen Limin. Temperature
People's Republic of China
Mechanical Industry Standard
Compensated Micromanometer
JB/T6800-93
JB/T6800--93
Published by the Institute of Comprehensive Technical and Economic Research of Instruments and Meters, Ministry of Machinery Industry; Printed by the Printing Service Department of Beijing Machinery Enterprises Association
Issued by the Institute of Comprehensive Technical and Economic Research of Instruments and Meters, Ministry of Machinery Industry★
First edition in March 1995
First printing in March 1995
Cost: 5.00 yuan
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