Some standard content:
1C917.200,20
Machinery Industry Standard of the People's Republic of China
JB/T9451—1999
Atmospheric pressure sensor
Test guide
Instructin for testing of atmospheric pressure seusor1999-08-06Published
National Machinery Industry Bureau
Implementation on 2000-01-01
JB/T9451—1999
This standard is a revision of "5002—89 Test Guide for Atmospheric Pressure Sensor". At the same time, in accordance with the requirements of the National Standards 1/T1.1-1993 Standardization Work Guidelines Section 1: Origin and Expression of Standards Part 1: Basic Provisions for Standard Writing, the original standard has been edited, the preface has been added, and the main technical content has been changed. This standard replaces ZBN950-Stationary Standard for Atmospheric Pressure Sensors from this date. The technical standard was produced and managed by the Changchun Meteorological Instrument Research Institute. The responsible person for drafting this standard is Changchun Meteorological Instrument Research Institute. The main drafter of this standard is Liu Yaotang.
This standard was issued in March 1989 with the professional standard number N95002-89. 1 Standard
Standard of the Machinery Industry of the People's Republic of China
Test Guidelines for Meteorological Pressure Sensors
Lrstroctica tor tegting atmaspberke pressure sensorB/T9451—1999
Generation ZB [N5002—89
This standard specifies the basic rules, technical requirements, test methods and result judgment of meteorological measuring instruments and pressure sensor devices.
This standard is applicable to the static test of instruments and sensor devices for measuring atmospheric pressure in meteorological equipment. In order to correctly evaluate and determine the system error of atmospheric pressure sensor devices used in meteorology and its responsiveness to the required performance of the device, a unified test code and test force can be formulated.
When quoting the various parameters specified in the standard, they should be selected according to the characteristics of the tested device and the specific requirements of the use conditions:? Test environmental conditions
2.1 Normal test environmental conditions
If there is no other provision in the technical requirements, the test shall be carried out under the following conditions: Temperature: 15%℃~35℃;
Relative humidity: 45%~75%;
Air pressure: 860hPa~1060hPe
2.2 Special screening test environmental conditions
If the parameters of the tested device are related to temperature, relative humidity and oxygen content, and the relationship between them is unknown or undetermined, the test shall be carried out under the following conditions:
Temperature: 25℃±1°C;
Relative humidity: 48%~52%;
Air pressure: 860hPa~1060hPg.
2.3 When conducting the elongation-plasticity test on the test equipment, the test shall be conducted by negotiating between the two parties and selecting one of the items listed in Table 1. Test conditions
Relative humidity
65 ± 2
: There is no influence on the test results, and the relative humidity can be ignored. 2.4 Other environmental conditions
Approved by National Machinery Industry Corporation on August 6, 199923 = 2
B60 ~1060
65 ±2
Implemented on January 1, 2000
JB/T 9451 --1999
2.4.1 The environment around the test site should be free from radiation. The standard instrument and the test instrument should be parked securely and properly installed in the same place, and should not be installed near heat sources (gas, flame, etc.) or doors. 2.4.2 During the test, the environment should be bright and clear. The device under test should not be exposed to direct sunlight. 2.4.3 During the test, there should be no obvious change in the temperature, and the human body should not feel the air flow. 2.4.4 The test site should be equipped with anti-pollution equipment, convenient for dust removal, cleaning, etc., and no waste should be piled up nearby. 3 Standard instruments and test equipment
3.1 Standard instruments and their requirements
According to the requirements of the test device, one or more of the following standard instruments can be selected as the test device) Standard mercury pressure gauge:
b) Double mercury pressure transformer:
e: Single-tube water channel pressure gauge:
! Planted or fixed mercury barometer,
3.2 Test casing and its requirements
] Gas test chamber:
for the test system (including the fixed device, must be closed, not every exciting air, its unevenness shall not exceed 0.3hPa/10mil; b) increase and decrease pressure device:
a number of 1SL~30L vacuum system:
e temperature test chamber:
a temperature point, the test number is kept at a fixed depth, "generally the temperature change does not exceed 2 points within 3h, the wet field and the hook, make the viscosity of the graph is %℃-5℃ and 25%~30; the minimum graduation value of the temperature table is not Should be greater than 0.2;
e! Total:
Time [stopwatch), (teach gas meter, calculation intelligence and power are small, the clip is too small and easy to read the equipment information: 4 Test requirements
4.1 Test procedure
The test device is checked and qualified. When the performance test is to be carried out, it should start from the point close to the natural atmospheric pressure at that time, and then rise or fall in sequence in a retrograde manner. 4.2 Total pressure quality
During the entire test process, the atmospheric pressure change should be stable, and the atmospheric pressure change should not exceed 3hP within 4h. When comparing the readings with the standard instrument, the pressure change should not be shorter than 15mlm. [5hPa4.3 Readings after reading
Before the test readings, tap lightly near the indicator mark, and then 1~2 people take turns to complete it. 4.4 Treatment
Before the test device is tested, it must be stabilized in natural normal conditions for a time of not less than 30min. 4.5 Air pressure change rate
During the test, when moving from one test point to another, the air pressure change rate should be determined according to the final characteristics of the test device, but should not be greater than 10hPa/min-26hPa/mn
4.6 Steering time
At each test point, after the air pressure is stable, it must be stabilized. According to the specific requirements of the device, the timing should be 2
JB/T 9451—1999 bZxz.net
30min, Srin, 1omin. 35uin, 20min 4.7 Test verification points
The test verification points and their values shall be determined according to the hysteresis of the device under test, the applicable conditions, the measurement range, etc. Its value shall be an effective sequence, and the method of continuous 5-10 or continuous double shall be adopted. 4.8 The efficiency of the test piece
During the test process, the number of rows of each standard instrument and the basic test instrument shall be determined according to the performance, volume, equipment and personnel of the test piece.
4.9 Pressure
During the whole test, the pressure drop of each test point must be kept constant, that is, there should be no pressure drop during the pressure drop process.
4.10 Recovery and parking
After the maximum pressure test of the tester is completed, if it is necessary to run other tests, it should be placed under normal conditions for more than 5 hours before other tests can be performed.
5 Test method
6.1 Positive pressure test method
a) According to the test requirements, the device to be tested is put into the system of the pressure test, and the pressure point, flexibility, magnification ratio and other items of the device to be tested are adjusted;
b) The device that has been adjusted and passed the inspection is put into the system of the pressure test; the tested pressure is compared with the standard device, and the test data is read: c! In the main pressure system, the tested device shall be compared with the standard device, and the results shall be shown; e) The accuracy of each reading shall not be less than 5% to 10% of the measured value, and the reading shall be directly processed:!
5.2 Temperature coefficient test method
When the device under test is affected by temperature and its performance and system error are affected, a wet spot test should be carried out according to the test method specified in this item.
This test is generally carried out under natural atmospheric conditions. a) The device under test is placed in a constant temperature chamber at the required test point. Generally, natural air circulation is used in the chamber, and the specified time should be more than 3 hours:
b) First, the air is circulated from 0℃ to 59℃, and then the test is carried out at 25%℃-30℃. The temperature difference between the two intervals should be greater than 20℃. Before reading the standard pressure and temperature values of the device under test, the specific requirements of the device under test should be adjusted according to the time and space if necessary, and then read the corresponding value:) Read another value 6.1 Pressure test results and evaluation
a) Clear the air pressure of the standard instrument, after correcting the instrument difference, temperature, gravity and other factors, subtract the reading of the tested device (the value corrected by the accuracy coefficient) to obtain the air pressure difference (after averaging multiple observations, the coefficient error value of the device). h) Calculate the pressure difference of each calibration point according to the above method 3
JB/T 9451—1999
c Calculate the average value of the two pressure differences when reducing and increasing the pressure at each fixed point 2) The average value calculated is the indication value of the point of the test equipment: e) The correction value of each point can be calculated according to the depicted curve or by the capture value method; Based on the calculated results, evaluate the results or put forward conclusion data according to the performance index requirements of the tested equipment. 6.2 Temperature coefficient test results
Based on the test results at 0℃5℃ and 25℃30℃, calculate the temperature coefficient of the environment above 0℃: b Calculate or find:
Ap,-(x, -xG,-I-).-.
In the formula: p
The thermal coefficient of the tested device,
The systematic error of the tested device at the higher temperature point;
The systematic error of the tested device at the lower temperature point:
The average temperature at the lower temperature point:
The average temperature at the lower temperature point:
c) Based on the calculated test results and the performance index requirements of the test elements, make a conclusion or put forward a conclusion. 7 Data processing
The various quantities in this standard and the calculated numbers need to be corrected, but when they need to be corrected, they should be corrected according to the specified accuracy range and unified rules.
Daily dynamic comparison test
Measure the dynamic performance data of the tested device, and refer to the requirements of this test guide. However, the environmental conditions of the standard instrument and the tested device should be verified as much as possible.
9 Long-term stability test
9.1 Verification cycle
a! If the verification period of the tested device is specified in the relevant technical requirements of the tested device, the specified verification period shall be used as the verification period:
5) If the verification period of the tested device is not clearly specified in the relevant technical requirements of the tested device, 1 year, 2 years, 3 years, or 5 years shall be used as the verification period according to the specific requirements, and the maximum period shall not exceed 5 years. 9.2 Test method
2) The test results of the first two static tests of the whole test device are used as the qualitative test leakage value, and the repeated static test results of the specified test period of the test device are compared with the standard value. If the result exceeds the relevant requirements of the test device, it is considered as the specified device;
b) This test must be carried out after the initial test is qualified. If any test in this test is not met, the test should be stopped immediately.
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