Some standard content:
Pressure Thermometer Calibration Regulations
JJG310—19X3wwW.bzxz.Net
Pressure Thermometer Calibration Regulations
af Pressure Thermometer Calibration Regulations Tikmomrter
MG310—19N3
This light treasure standard was approved by the State Administration of Quality Supervision, Inspection and Quarantine on November 26, 1983, and came into effect on October 1, 198. The responsible unit is: Dajing Xinji Supervision and Administration Co., Ltd.
The starting unit is: Renyang City Technical Research Institute
The local technical record drafting unit is the sample standard of the sample standard. The main drafters are:
Wu Wenquan (Renmin Metrology and Water Research Institute)
Technical requirements-
Standard calibration equipment
Calibration environment and calibration method
Pressure thermometer calibration standard
||This regulation is applicable to the calibration of newly manufactured, used and repaired scales measuring gas, gas pressure type or indicating thermometers (hereinafter referred to as simple thermometers) with a measuring range of -6000 tons and mechanical installation temperature (hereinafter referred to as average temperature at the middle point).
1 Technical requirements
1 The protective glass used for the thermometer head must be kept transparent and must not have any defects or damage that hinders correct reading.
All parts of the thermometer should be intact, not loose, and without obvious rust and peeling. 2
3 The scales, numbers and other signs on the dial should be complete, clear and accurate, and the pointer should extend within 1/4 to 3/4 of the maximum line of the scale. The tip of the pointer should not exceed the scale mark. Width of short graduation line: The distance between the pointer of the thermometer and the half of the graduation dial should be within 131 degrees Celsius. The dial of the thermometer should be marked with: the symbol of the practical temperature scale of China, "5 degrees Celsius", manufacturing name (or "mark"): model and factory confirmation number, accuracy level, year and month of manufacture, contact weight should also be marked on the dial or outer cover: contact rated power, high working voltage, AC or DC amplification range current, "three" mark on the terminal, 6
The thermometer should have a small printing device. The internal parts should not be touched under the condition of non-destructive disassembly: 7
The accuracy grade and allowable basic limit difference of the thermometer shall comply with the provisions of 1, and the number 1
is higher than that of this model (% of the measurement charge). tt||: chemical, thrust loss meter for thrust machine, not over purchase quantity and upper limit 4% 12) meter accuracy index 2 parts: the first part of the adjustment, one year,! Good number within 5.0 frequency only suitable for the accuracy of 3.5 steam H: knife to prove the skin of the first band, the thermometer in the calibration process, the pointer to move smoothly, shall not have obvious jump phenomenon, (steam pressure flow meter in the temperature part of the pointer is allowed to have slight jump) 9 the phase error of the meter should not be large enough to allow the basic error of the pair, 1U electric point temperature contact action error should not be greater than the allowable error 1.5 times 11 electric contact leakage meter contact switching difference should not be greater than the allowable basic error absolute value 1.5 consultation. 12 When the ambient temperature is 5.-35°C, the insulation resistance between the contacts and between the contacts and the outside should be no less than M
. The second standard and calibration equipment are replaced by
135°C for the first-class standard mercury meter. In the specification of -8040, -M, the flow of 982°C and 982°C respectively, the standard is selected according to the standard - Kangrun thermoelectric and the second-class energy pin resistance monitoring parts. 14 The calibration equipment should have a constant temperature (see Table 2), a mirror (Section 5-1), and a 500V megger. When using standard - copper thermocouples and other standard pin resistance thermometers as standards, they should be equipped with a 1.02-level low-resistance differential meter and a cabinet-mounted electrical measuring device. 2
Finished product name
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-1~+05
+35- +30
1. Work address large products in total
Each guarantee standard is also produced.
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Verification items and verification methods
The verification cycle of the thermometer is shown in Table 3.
Specifications
History
Format
(1) The table shows the calibration of the small tube
(2) 1. For the positive force type calibrator specially used for the towing control machine, only 1:2 is required to be calibrated. The following conditions should be met during the calibration:
The calibration cycle is (20±5):
The meter head of the thermometer should be installed vertically;
The height difference between the meter head and the vial should not exceed 1m;
The salt bag overflowing during the calibration must be completely removed, and the lead pipe error should not be less than 13-2. The external inspection and verification
The thermometer shall comply with the requirements of 1 to 6 of this standard. The temperature after neutralization and adjustment shall be fully evaluated for defects that do not affect the use and accurate readings.
18 Verification
81 Verification point: The verification point of the thermometer shall be evenly distributed within the measurement range (generally referring to the upper and lower limits of the measured product) and shall not be exclusive. For the temperature setting in the use, the verification point can also be appropriately determined according to the energy consumption (for example, the verification points of some pressure-type thermometers should be selected at the middle point and upper limit of the measuring type) 18.2 Verification: The basic error of the thermometer should be determined on the positive and negative lines respectively: The zero point must be determined first if there is a zero point. Thermometer measurement limit! 18.2: Determination method: When reading the confirmed temperature meter, the number should be calculated to 10 of the product's small scale. When using the large-scale reading, the product should be careful: B.4: Point verification: Insert the thermometer's identification bag with ice and water mixed in the freezing point, and the effect can be determined after 1m. 18.5 Other points are determined by comparing with the standard thermometer. The temperature is within .5C (based on the standard thermometer). The temperature of the thermometer is at least 10in lower than the set temperature. After the small-scale determination, the number is selected to verify the standard thermometer. And the temperature meter (or the reverse temperature meter) in the process of talking about the number of use, when the resistance is below 00, the temperature change should not be greater than 1: when the overflow exceeds 300, the change should not be more than 10.5. When the indication of the electric contact material is calibrated, the upper and lower limit pointers are set at positions outside the upper and lower limits respectively
over-temperature actual humidity - standard thermometer indication - the correction box of the thermometer. The basic error of the meter under test = the value of the meter under test The indication of the meter is subject to the actual temperature tolerance. The basic error of each point of the meter should comply with the provisions of Article 7. 19 The pointer movement level inspection is carried out during the indication verification process. When the dial rises or falls, the pointer movement level inspection is carried out in accordance with the provisions of the system. 20 The return error is carried out during the indication verification process. When the meter inspection points are calibrated to the highest measurement upper limit point (or the lowest measurement lower limit point) in turn, the pointer movement level inspection is carried out in accordance with the provisions of the system. ), then evenly drop (or rise) or move the temperature bag into another temperature bag, check the calibration points in reverse order, the difference between the basic errors of the thermometer's positive and negative travels is the square error, the new point is in accordance with Article 9 of the provisions of
21.21.1 Calibration points: can be distributed on the soil graduation line within the measurement range, and shall not exceed 3 points. The upper and lower limits of the measuring plate of the electrical contact channel are always used as calibration points.
21.2. Test method: Insert the standard thermometer and the tested contact transformer into the test cell, and connect the 9-wire of the contact to the signal circuit. Control the constant temperature standard transformer to rise, and read the inverse value of the standard thermometer quickly at the moment the signal is connected, and then slowly reduce the temperature, and read the standard thermometer quickly during the signal disconnection period. The rising and falling speed of the constant temperature transformer should not exceed 1 meter. The contact is closed and disconnected at each time, and the value of the standard thermometer when the signal is connected and disconnected is recorded. The difference between the increase in the setting value of the pointer of the electric contact thermometer (calibration point: and the opening value of the action hole opened by the closing of the test point (standard thermometer value) is the contact action error, and its maximum difference does not exceed the provisions of Article 10. The difference between the closing, breaking or operating temperature of the electric contact thermometer at the set point (standard thermometer minimum value) is the contact initial connection error, which is in accordance with Article 11. The calibration of absolute peak voltage is 500V megawatt. The two wires of the model are connected between the contact point and the outer shell of the meter point. The insulation value of the thermometer is in accordance with Article 12. The fourth treatment of the verification result is as follows: The thermometer that has passed the verification should be sealed: The thermometer that fails the verification can be downgraded. It is not necessary to change the grade mark on the back of the thermometer. The verification period of the thermometer should be determined according to its actual use.
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