This standard specifies the technical requirements, test methods and inspection rules for digital thermometers for smelting. This standard applies to digital thermometers (hereinafter referred to as thermometers) that directly measure the temperature of molten metal or solid surface. JB/T 8800-1998 Technical requirements for digital thermometers for smelting JB/T8800-1998 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T880)-1998
Technical Conditions for Digital Thermometers for Melting
Published on July 17, 1998
National Bureau of Machinery Industry
1998-12-01 Implementation
B/T8800-1998
This standard is issued by the National Foundry Machinery Standardization Technical Committee and is under the jurisdiction of the Ministry of Machinery Industry. The drafting units of this standard are: Jixi Chuan Acid Press Research Institute of the Ministry of Machinery Industry, and Xin'anjiang Bada Industrial Furnace Instrument Factory. The main drafters of this standard are: Lu Jun, Jin Zeming, and Ling Lijing! Scope
Machinery Industry Standard of the People's Republic of China
Digital Thermometer for Melting
Technical Conditions
This standard specifies the requirements for the change of the temperature measurement for melting, the test method and the inspection rules. 18/T 88001998
Digital Thermometer for Melting (hereinafter referred to as the digital thermometer) is suitable for measuring the temperature of the solid surface of the solid surface in the real environment. 2. Referenced Standards
The texts contained in the following standards are quoted in this standard and constitute the standard series. When the standard is published, the versions shown are valid. All standards will be revised. The parties who reuse this standard should explore the possibility of reusing the following standards according to the latest version. CB/T 1JJ06--11
GB/T 13639-52
Industrial process simulation performance indicator GB/154611S55 General technical conditions for instrument packaging ZB5021
ZBY8284
3 Terminology
Instrument and meter basic operating environment and test conditions and liquid display instrument quality standards
This standard applies to the following meanings.
3.1 Basic error
Thermometer standard error under reference working conditions, 1.1 Working conditions
The working conditions that determine the performance of the thermometer Condition range, in this range the influence of working conditions can be ignored, 3.3 Warning working conditions
The new working conditions that need to be determined should be affected by the working conditions within this range. 3. Set back
Under the same working conditions, the same adjustment should be made to the display difference when re-measured, 3.5 Lower limit
However, the delay can only be accepted according to the minimum value of the auxiliary input of the specified precision source. 3.6 Upper limit
The highest value of the number that can be measured according to the specified conditions, 3. The part of the display range that can meet the specified screening degree: 3. 8. The upper and lower limits of the measurement range are not indicated. The value displayed by the reading device is not affected by the error. 3.10. Modular error JB/T 8800--1998 When the reading value changes, the instantaneous error caused by the lack of precise synchronization of the effective digits, such as 199 to 200, it may indicate 299 or 209. 3.11. Response time The time from the input signal change to the new state value displayed by the instrument entering the specified error limit. 3.13.1.2.1.2.2.3 ... 3.13 Overload recovery time
The response time from the removal of the overload input signal to the new state value displayed by the instrument within the range. 4 Technical requirements
4.1 The thermometer shall comply with the provisions of this standard and be manufactured according to the approved sample and original documents through the prescribed procedures. 4.2 The purchased parts of the thermometer shall comply with the provisions of the relevant standards and have a product certificate: 4.3 The label of the thermometer shall comply with the provisions of GB/T13306. 4.4 The reading of the temperature display shall be clear, without any missing characters, and there shall be no missing phenomenon. The display glass shall be bright and shiny, and there shall be no obstructive marks.
4.5 The housing of the measuring panel shall have a good surface treatment, without scratches, scratches, etc., and there shall be no damage, damage or missing parts. 4.6 The switch and control button shall not be loose, damaged or change position by themselves, and shall have the corresponding function in the specified state. 4. All wiring terminals shall be complete, the internal parts shall be arranged neatly and cleanly, and there shall be positioning devices between the connectors and the sockets to ensure that the plug-in has a unique corresponding relationship. The input unit and the plug-in shall have a fastening or locking device. 4.8 The normal direction of the display plane of the leak detector shall be able to clearly observe the data within 30 degrees of any direction, and there shall be no data model or change in the display.
4.9 The basic error (4) of the temperature measurement should not exceed the allowable basic error limit (4...). The basic error limit 4... is calculated according to formula 1):
4-= (0.2 X F.5 +4>
In the formula, F, S——the start-up time of the temperature measuring instrument, : the effective resolution of the temperature measuring instrument, bzxz.net
4.10 The reading error of the temperature measuring instrument should not exceed 1℃. 4.11 The temperature measuring instrument should recover the value of the display (increase, decrease) and should not jump. The different digital positions should be synchronized accurately and should not produce any connection error.
4.12 The display of the temperature measuring instrument should not fluctuate by more than 1℃. 4.13 Response time technical indicators
4.131 The response time of the temperature measuring instrument should not be greater than: F. 4.13.2 The overload recovery time of the temperature measuring instrument should not be greater than 2$. 4.14 The thermometer should have a value holding function. 4.15 The indication change of the thermometer under the external field condition of magnetic field strength of 40A/m should not exceed 1℃. The maximum energy of the thermometer when working should not be greater than the rated power consumption of the thermometer. 4.16 The indication change caused by the drop test of the thermometer should not exceed 1℃. 4.17 4.18 The indication change caused by input overload should not exceed 1℃. 4.19 The thermometer should be able to work under the following conditions: 1) The voltage changes within the range of 75%-110% of the rated voltage. 2) Under the condition of temperature 10±2℃ and relative humidity 90℃=3℃. 4.20 The thermometer should have the necessary indication functions such as disconnection, quantity, power failure, etc. 4.231 The indicated value of the thermometer after comparison test shall not exceed the value given in the table. 4.232 Unless otherwise specified, the measurement range of the thermometer shall comply with ZBY282. 4.233 The accessories of the thermometer shall be complete.
5 Test method
5.1 Determination of basic error
5.1.1 The reference working conditions for temperature measurement shall comply with the provisions of Table 1 of GB/T13G39-92, where the allowable error of DC supply voltage is ±10% of the rated value, the basic value of reference temperature can also be selected as 23°C, 27°C, 5.1.2 The temperature meter shall be placed in the reference temperature range for more than 2 hours before measurement can be carried out. 5.1.3 The temperature meter shall be measured within ten measurement cycles, with the up and down strokes as one cycle. Perform no less than three cycles of testing, and there shall be no less than five test points, of which 0.5.0.8 of the upper value and the upper limit value are mandatory points. 5.1.4 Input the thermoelectric potential given by the thermoelectric bias voltage divider into the temperature measuring instrument using a U.5 grade certified potentiometer, record the displayed value of the measured group, and calculate the potential error at each test point in each test cycle using formula (2) (4): 4=14
.1.
5. 1. 5 Determine the indicated value of
at the tested point:
is the highest specific indicated value corresponding to the input quantity of electricity at the tested point. Take the maximum value as the basic error of the thermometer. S.2 Thermometer indication error (2] The limit error is determined by the average value of the thermometer indication at each test point in a cycle and the maximum integral value between it and its indication.
5.3 Determination of peak value holding function
Set the peak value holding function to the state, input about 75% of the signal, and after the original indication of the thermometer is stable, reduce the input signal, and the six values ​​should remain unchanged.
5.4 Wavelength test
The test can be carried out at the same time as the basic error test. Therefore, stay at each test point for a period of time (of), read the wave or range of the cloud value, and take the six hypothetical passive generation of 12 as the fluctuation value of the humidity measurement. 55 analog transmission difference test
The core test can be carried out simultaneously with the basic difference test. Observe the thermometer indication is the reading auxiliary counting source (increase the resolution, the digital end after the end jumps) according to the same method of the Bureau A end research
5.6 The time of the connection is determined according to 6.6.1 of GB/1829-92. The time of the over or over is determined according to 6.2 of C/139-9. 5.7
5. The monthly power consumption is measured according to 6.7.1 of GB/T136392, 5.9 External temperature shall be measured according to 6.3.6 of CB/T18689-02. S.10 Determined according to G.3.11 of GB/T1339-92+. 5.1 Determination of the influence of power supply voltage
respectively input .75, .5.9V output voltage. The change of the temperature meter indication shall be within the basic deviation. 5.13 The influence of thermal conditions shall be as specified in 6.3.B of GB/1363-92. S. 14 Temperature test
Take a measuring source of the same model and select the corresponding heat source, and measure the molten iron of the same ladle at the same time. The average of the three temperature measuring values ​​and the integral value of each temperature display shall be the difference between the test temperature. 5.15 Basic environmental conditions for transportation and storage shall be measured according to ZBY002. 6 Inspection rules
6.1 Return to factory inspection
6.1.1 Each filter shall be inspected and qualified by the manufacturer before it can be shipped out! 6.1.2 The temperature measuring instrument shall be inspected in accordance with 4.3~4.9, 4.11 and 4.23. 6.2 Type inspection
6.2.1 Type inspection shall be carried out in the following circumstances: a) During trial production of new products; h) When the product design process and materials have major changes; ) The mass production shall be inspected regularly, not less than once a year. 2) When the normal production is resumed after more than 1 year of production; when the test results are significantly different from the last type inspection, the national quality supervision agency shall conduct type inspection according to the requirements of the question, (2.3 Type inspection: Randomly select 2 sets of products that have passed the type inspection, and each inspection shall not be less than 3 sets. 6.2 Type inspection shall be carried out on all items specified in this standard, and all the inspected items shall be qualified. Packaging, transportation and storage
The packaging of the instrument shall comply with the provisions of GB/T1546. 7.1
7.2 The basic environmental conditions for transportation, transportation and storage of the tester shall comply with the provisions of Table 1 in ZBYCC2-31.
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