JJG 364-1994 Surface Thermometer JJG364-1994 Standard download decompression password: www.bzxz.net
This regulation is applicable to the calibration of surface thermometers with a temperature measuring range of 0~600℃ and thermocouples as temperature sensing elements, which are newly manufactured, in use and after repair. Other types of surface thermometers can be calibrated in accordance with this regulation.

Verification Regulation of Surface Thermometer
JI.IG 364—1994
Verification Regulation of Surface Thermometer
JR: 364—1994
Recommendation 116: 354—1984
This verification procedure was approved by the State Administration of Equipment Supervision on July 12, 1994, and was implemented on December 11, 1994. The responsible unit is: Liaoding Technical Supervision Bureau
Drafting unit: Shenyang Metrology and Testing Institute
Technical text of this procedure is explained in detail. The main drafter of this procedure is: Zhang Jiatian
Additional drafters:
Zou Kuaihui
(Northeastern University)
(Shenyang Metrology and Medical Testing Institute)||tt ||(Shenyang Metrology and Testing Institute)
(Shanghai Yonghuogong Watch Factory)
Technical requirements
Quality conditions
Verification items
Verification processing and verification cycle
Appendix 1 1 Verification record with thermocouple as standard instrument 2 Verification sheet (sheet) format
Verification procedure for surface thermometers
This procedure is applicable to the verification of surface thermometers with thermocouple as standard instrument that are newly manufactured and put into use after use. The surface temperature of other types of components can be calibrated according to this regulation: 1. The thermometer (hereinafter referred to as the thermometer) is mainly used to measure the surface temperature of the static or moving object: the thermometer is a thermometer with a thermocouple plate and a compensation line indicator. The indicator can be divided into two types: pointer type and digital type. When using a pointer type indicator, in order to compensate for the change of the thermocouple zero reference end, a temperature compensation component is installed at the virtual position of the meter. Digital thermometers do not have thermocouples. Considerations and research:
2. Technical requirements
1. Appearance
1. The measuring end of the thermocouple is welded and in the center position. Its offset shall not be greater than 3. The welding point should be stable, especially the welding point should be stable, and there should be no obvious defects such as serious wear and corrosion. 1.2. The plate parts of the thermometer should be stable and the contact should be good: the connecting part should be of good quality, and the movable part should rotate freely.
1.3 The name of the manufacturer (or trademark): the production license number of the measuring instrument, the temperature decay meter number and the accuracy of the thermometer shall be marked in a conspicuous place on the thermometer. The scale of the temperature compensation instrument shall be clear and marked with the decay unit (t:). The starting point of temperature compensation is t:. At this time, the temperature sensing element and the compensation thermoelectric power supply are both in the lower cabinet. The regulator should be able to ensure that the pointer does not move. Caution:
[,3,2 The indication meter has no defects that affect the number. 1,3.3 When the switch is in the fixed state, it should have the same or the same kinetic energy. 1.3.4 The indication number should be displayed regularly, without any phenomenon such as non-display, overlap, missing quotient, etc. The decimal point is accurate and there is no allowable error. The allowable error of the meter is as shown in the table!
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When the pointer of the instrument, from the specified position to the direction of the river 45, Ai Qiuyi chemical should not be left in the free calculation product
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When the environment is hot (205), the relative humidity is not more than 8, the insulation resistance between the thermoelectrode and the protection tube is not less than 21M?
Sun: The battery supply is also not tested. Three verification conditions
5 Verification of the standard required for the speed meter and the equipment must be 10- ... 5.2 Thermometer calibration range: a hot plate with a high relative humidity of 100°C, a constant temperature of 205°C in the center of the hot plate, and a uniformity of less than 10°C; the hot plate surface is smooth, free of grease, dust and other substances, and no surface oxidation is allowed to affect the accuracy of the calibration.
The voltmeter is not less than 0.05, and the accuracy is 1V or equivalent to that of the standard measuring device. 5.3
5.4 Automatic control station, the control is [t/15i, 5.5
The standard thermoelectric temperature controller is a
temperature controller with a accuracy of .1, and the measurement range is -50%. One 500V megohmmeter. The calibration environment of the thermometer shall meet the following conditions: 1. The temperature of the calibration room shall be (20=5), and the relative humidity shall not exceed 10%. 2. There shall be no obvious gas flow in the calibration room, and no other heat field that may affect the calibration. 3. Except for the combustion field, there shall be no external acid field that may affect the normal calibration of the thermometer in the surrounding environment. 4. Calibration items and calibration methods: Calibration items, see Table 2 for the calibration items of 11. The following items are not included in the list: 1. Appearance inspection: The measurement shall meet the requirements of Article 1 of the regulations. The thermometer used and repaired by the company shall not have any missing items that may affect the use and accuracy of the method. 9
Verification of the image
Fan Xuedian
refers to the instrument before and after the starting point, the start, the slight slope, the width of its indication change meets the provisions of Article 3. Small value error calibration of thermometer
1.1 Before the calibration of the temperature measuring element of the thermometer, the temperature indicating element shall be cleaned to remove the chemical film, grease and other substances that affect the measurement accuracy:
When there is an oxide film on the measuring end of the temperature element, the measuring end can be wiped with coal-free salt, and then wiped with empty kerosene for 2-3 times, and the measuring end is cleaned with fine filter until there is no dirt on the measuring end
The small value error calibration of the thermometer is carried out by comparing the hot plate of the surface thermometer calibration furnace with the standard. 10.3 [01% point setting, its value difference should meet the requirements of Table 1, and take it as the standard for judging whether the meter is qualified. After consultation, the setting of other points can be given the correction value according to the user's reason. 10.4 Verification method
10.4.! When the meter is in the normal working position, for pointer instruments, adjust the pointer to 30t: point: for digital instruments, put the switch in the on position, and verify the indicated number. 10.4.2 The measuring end of the special thermometer is placed on an equal surface not more than 5mm away from the measuring band of the standard instrument. The measuring distance between the measuring plate and the temperature shall not be less than 10. The measuring end of the temperature to be tested is also placed closely on the potential plate. 10.4.3 Put the attached hygrometer in the middle for 5min to record the temperature, 1.4,4 the temperature of the hot plate of the calibration furnace rises steadily When the temperature reaches the required calibration point temperature, the temperature deviation shall not exceed =5t. After calibration, record the set value, then place the thermometer on the hot plate according to 10.1.2. After the indication stabilizes, record the reading. Repeat the steps. The reading of each calibration point shall not be less than 2 times. When counting, the case of the pointer instrument shall be gently covered. 10.4.5 During the calibration process, the environmental aging shall comply with the provisions of Article 6.1. 11 Insulation calibration
The insulation between the thermocouple protection tube and the megohm test tube shall comply with the provisions of Article 4 of this regulation. 5. Calibration auxiliary treatment and calibration period
12 Indication adjustment calculation method
When the standard instrument is a second-class standard thermocouple, the experimental accuracy of the hot plate surface can be calculated by the following steps:
et =e+4e
Where: Thermoelectric potential corresponding to the surface temperature of the hot plate: mV: The arithmetic average value of the two readings of the standard thermoelectric potential value at the same fixed point: mV; en
The potential value of the standard thermoelectric potential value at the fixed point of the calibration, mV. Calculate the temperature of the standard thermoelectric potential value of the thermocouple! : After the humidity is gradually measured, the humidity is measured according to the formula (3): (#——( 30C)
wherein,
the temperature of the thermometer,
the average value of the indication of the test thermometer t::
the reference end temperature of the test thermometer.t
the correction value of the test thermometer is calculated according to formula (4): Wushan:
the correction value of the test temperature and humidity,;
*same as above.
calculation: formula (that is, the average value of the test thermometer) 13||tt ||Real-or
The final calibration will be issued to qualified thermometers, and a calibration certificate will be issued; small results will be issued. The calibration cycle of temperature! is 1 year
Appendix 1 Verification record of the decay surface thermometer with the thermoelectric regulator as the standard instrument
Liquidity section
Environmental exposure section
Standard thermoelectric sea number
Standard thermoelectric regulator fast two m
Display Jun meter water level
- 3nt:
Production:
Thermal material
Verification: 1st period
M you analyze the influence of the degree of determination
Determination of the maximum
Environmental temperature
Surface condition payment
Appendix 2 Verification certificate (back) format
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