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application
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Specially designed for the petrochemical sector, it can directly measure the surface temperature of liquid, vapor, gas media, and solids within the range of -200 ℃ to 1600 ℃.
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Working principle
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The electrodes of a thermocouple are composed of two different conductors. When there is a temperature difference between the measuring end and the reference end, a thermoelectric potential is generated, and the working instrument displays the temperature value corresponding to the thermoelectric potential.
Thermistor is based on the principle that resistance is a function of temperature. When there is a temperature difference in the measured medium, a thermal resistance will be generated, and the working instrument will display the temperature value corresponding to the thermal resistance.
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Main technical parameters
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Product execution standards
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| IEC1515 IEC584 IEC751 JB/T5518-91 JB/T5582-91 |
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| nominal pressure |
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Generally refers to the static external pressure that the protective tube can withstand at room temperature without breaking. The allowable working pressure is not only related to the material, diameter, and wall thickness of the protective tube, but also to its structural form, installation method, and the flow rate and type of the measured medium.
○ Temperature measurement range and allowable deviation
● Thermocouple
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model
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Graduation
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Tolerance level
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I
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II
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Allowable deviation
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Temperature measurement range ℃
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Allowable deviation
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Temperature measurement range ℃
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WRN
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K
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±1.5℃
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-40～+375
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±2.5℃
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-40～+333
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±0.004│t│
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375~1000
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±0.0075│t│
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333~1200
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| WRE |
E |
±1.5℃
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-40～+375
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±2.5℃
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-40～+333
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±0.004│t│
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375~800
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±0.0075│t│
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333~900
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| WRP |
S |
±1℃
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0～+1100
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±2.5℃
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0~600
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±(1+0.003(t-1100))
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1100～+1600
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±0.0025│t│
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600~1600
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| WRQ |
R |
±1℃
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0～+1100
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±2.5℃
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0～+1100
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±(1+0.003(t-1100))
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1100～+1600
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±0.0025│t│
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1100～+1600
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WRR
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B
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-
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-
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-
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-
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-
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-
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±0.0025│t│
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600~1700
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| ● Thermistor |
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model
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Graduation
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Measuring range
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accuracy class
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Allowable deviation
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WZP
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Pt100
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-200～+500
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A-level
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±(0.30+0.006|t|)
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Grade B
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±(0.15+0.002|t|)
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WZC
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Cu50
Cu100
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-50～+100
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-
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±(0.30+0.005|t|)
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