JJG 368-2000 Verification Procedure for Working Copper-Copper-Nickel Thermocouples JJG368-2000 Standard download decompression password: www.bzxz.net
This procedure applies to the initial verification and subsequent verification of newly manufactured and in-use working copper-copper-nickel (Constantan) thermocouples with a measuring range of (-200~350)℃.

Working Copper/Capper-Nickel Thermocouple Verification Regulation
LJG 368-20
Working Button. Nickel Thermocouple Verification Regulation
Verificatinn Regulation nf the WorkingCopper/Capper-Nickel 'ThemocuupleJJG 36820H
『IG 3Tin—1984
This regulation was approved by the State Bureau of Quality and Technical Supervision in July 2000 and has been implemented since May 2000. Responsible unit: National Temperature Instrument Metrology Technical Committee Drafting unit: Liaoning Provincial Measurement and Testing Technology Research Institute Technical regulations Technical provisions entrusted to National Temperature Instrument County Measurement and Testing Technical Committee Main drafters of this regulation:
Sun Yunfei (Liaoning Metrology and Testing Technology Research Institute) Song Dehua (Liaoning Provincial Metrology and Testing Technology Research Institute) Additional drafters:
Xiao Benqi (Liaoning Provincial Measurement and Testing Technology Research Institute) Product Testing Technology Research Institute) (Liaoning Province Measurement Technology Research Institute) Li Miwei (Jining Province Metrology Testing Technology Research Institute) 1032
1 Technical requirements
2 Calibration equipment
3 Calibration method
4 Treatment of calibration results Calibration average:
Appendix A Thermocouple table
Appendix Monthly adjustment record of copper thermocouples
Appendix Work history-copper nickel thermocouple calibration certificate (back type) 1031
Calibration of copper-copper nickel thermocouples for work Regulations
This regulation applies to the first and subsequent calibration of the new H-system (accounted energy) thermal couple (hereinafter referred to as thermocouple) with a pressure range of 2·3Y: [Technical requirements
1.1 The technical conditions of the thermocouple and the nickel-steel electrode should meet the requirements of the standard (Standard 2903-1998). The thermal couple welding point should be solid, smooth, with no holes. The diameter of the electrode should be twice that of the electrode. The right side of the electrode should not be folded. There should be an insulating layer on the outside to protect the kidney. 1.2 The length of the thermocouple should not be less than 1.2m. Copper and the diameter of the electrode are effective, the same diameter thermoelectric use of the stock height range as shown in Table 1:
new system month use,!
card period month system
number of false reference end send 0 when, at each calibration point of the potential electric dye calorific value and the scale table blue meter error should meet the provisions of 1.3
: the more positive and negative the thermocouple calibration range, the greater the sensitivity of the calibration equipment
period - endurance code Ma electric potential and no
thermal service other network
4.55 - 4393
V245 - 133:
479, - {·932
1232 -4320
SJR ·97n9
1473: :1499.3
27v4 -. -2370
-5287-.3151
2.1 Calibrator: [200-0 range standard - copper ammonium thermometer, -30-300) range 2 standard water limit current signal or [-200~419.527 range jade 2 class standard power resistance thermometer, 2.2 Other calibration equipment
2.21 (.02 class low potential current gain (small step value 1V) and with etiquette or less low accuracy electrical measuring equipment. If you use 2 class standard resistor temperature, use . Eat class 1 standard resistor and current lu3a
reversing F switch,
2.2.1 Liquid spelling and ice spectrum.
2.2.3 When the temperature difference between the working points in the upper working area is not greater than 0,
2.2.4 Freezing point tank or freezing point device should be used to protect the product.2.2.5 Low-cost electric potential conversion switch, small thermoelectric potential
2.2.6 Thermoelectric micro-connection equipment.
2.2.7 Reading telescope, 5~10 times, used for measuring the sun 2 standard energy mercury thermometer
3 Verification method
Thermoelectric calibration cumulative use comparison, wiring 3.1
As shown in the figure
[a multi-point comparison can be related |2 a method point group, 1. System use; a name or you when the heat: - number of Laran Ma Shang 3.1.1 Thermoelectric needs to see Mai 2, the thermocouple measuring end and the reference Rui insertion depth shall not be less than 200 positive 3.1.2
[961 left liquid nitrogen extraction fixed.
·79 in low temperature grid or thousand ice file calibration
10K1, 200, 30 yuan in constant temperature habitat cross fixed. The reference end temperature is,
the calibration piece must be controlled within the range of -0.5 of the set point. The temperature determination shall be in accordance with the following sequence - Tested 1 Tested 2
+ Tested 2… - Tested
The maximum number of measurements for each calibration point shall not be less than +2 times (1 cycle), and the temperature change before and after the reading shall not exceed 0.1. The calibration record shall be in Appendix E format.
3.2 When comparing the standard thermometer with the standard, follow the line diagram 2, and measure each time before and after the current is reversed: · one. 1 Processing of calibration results and calibration cycle
When using a second-class mercury thermometer as a reference, use a formula to correct the thermoelectric potential of the thermocouple to the set point:
F, E, +(ledr),ar
Where: point, the thermal electromotive force when it reaches the calibration point (product V): E: --- the thermal potential value measured at the calibration point (V) --- and the rate of change of thermal potential near the calibration point is obtained by using the graduation table (Appendix A): (dedt.
Where: --- nominal temperature of the calibration point (T): , --- the actual temperature measured by the standard tracer
some values ​​of the actual temperature at a certain point () ()
4-1m: 5-1 standard: 1-freezing point: 7-1: code:
For example: near the 30[yuan: calibration point, the thermal electromotive force obtained by the thermocouple is 48552, and the actual temperature of the temperature measurement field is 300.15 degrees Celsius. Calculate the thermal electromotive force of the thermocouple at 300 degrees Celsius: r - 3kl - 300.15: - 0.15
Thermoelectric potential change rate obtained from Appendix A: (de/d)a/=(14.920-[4.826)mv/C=58jrV/ts = 14853 4 58 ×([.15) = 14846/±4.2 When the standard thermocouple is used as the standard pair, the thermoelectric false thermoelectric potential is compensated to the thermoelectric potential value at the calibration point:
Wherein: eFee
The thermoelectric potential value of the thermoelectric valve at the calibration point (V): The arithmetic mean value of the thermoelectric potential measured near the calibration point (uV): 43)
The standard thermoelectric certificate gives the difference between the thermoelectric potential at the calibration point (certificate?) and the arithmetic mean value of the thermoelectric potential measured near the calibration point (),
eEu-E*
Blood For example: The calibration is discussed, and the following average value is obtained based on the measurement results: e#--553.3V
Given by the standard thermoelectric certificate:
Ecup=-4oy
r =-5491 (-5495) =4μV
et5533+4 5529u
When the temperature of the power supply is used as the standard, the temperature conversion and calculation book are detailed in the standard copper rust thermoelectric adjustment calibration specification 4.3
(G115-1959)
4.4 The qualified power supply will be issued with a calibration certificate, and the calibration book will be engraved in the format of the calibration book. The working period of the copper brocade thermoelectric calibration can be determined according to the use situation, and the longest period shall not exceed 1 year. 4.5
Appendix A Copper-Copper Pin Thermocouple Graduation Table
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- 1-HI
-6-232
. 3.L1R
.5.515
. 4.275
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. :.364
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S,GS:F
.4.780
-2 .215 [
-h 087
-5 287
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11, 907 | 3sn7
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13 356
.7.040
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26-132
14,804
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Has been:
Appendix R Working copper-copper nickel thermocouple calibration record Main equipment
Beat grid?
: -E -hk
Teaching control:
Appendix C Working copper-copper mirror thermal network calibration certificate (face format)
Test belt temperature is
Evaluation environment evaluation
Children's summary!
Micro grid 5
Thermoelectric potential value ()
Drum technology 6
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