Location -> Products -> Temperature -> Thermocouple and Thermal Resistance -> Special Thermocouple(thermal resistance)
Type：special thermocouple(thermal resistance)
Illustrate：We design special structure for different occasion to directly measure the temperature of liquid, vapor, gas or solid surface ranging from -200C~1600C
Special Thermocouple(Thermal Resistance)
Application
Operation theory
Thermocouple electrode are made of two different materials. Temperature difference between measuring end and reference end results in pyroelectric potential, then display meter indicates the corresponding temperature to the pyroelectric potential.
It is based on that material temperature change of its resistance. When resistance value changes, the working instrument will display relevant temperature.
Main technical parameters
Executive standard
IEC584
IEC751
JB/T5582-1991
Nominal pressure
It generally refers to sustainable static pressure on protection tube from outside without breakage. It concerns not only material, diameter, wall thickness of protection tube, but structure and mounting way of the tube, flow speed and category of tested media as well.
Insulation resistance at normal temperature
The insulation resistance between electrode and protection tube of the thermocouple shall be no less than 1000MW. m under condition that environment temperature is 20±15C, relative humidity is no more than 80%, and test voltage is D.C.500±50V.
The insulation resistance between electrode and protection tube of thermal resistance shall be less than 100MΩ under condition that environment temperature is 15±35C, relative humidity is no more than 80%, and testing voltage is D.C.10~100V.
Thermocouple
|
Type |
Graduation |
Tolerance class | |||
| Ⅰ | Ⅱ | ||||
| Tolerance value | Measuring range ℃ | Tolerance value | Measuring range ℃ | ||
| WRN | K | ± 1.5C | -40~+375 | ± 2.5C | -40~+333 |
| ± 0.004|T| | 375~-1000 | ± 0.0075|T| | 333~1200 | ||
| WRE | E | ± 1.5C | -40~+375 | ± 2.5C | -40~+333 |
| ± 0.004|T| | 375~800 | ± 0.0075|T| | 333~900 | ||
| WRP | S | ± 1C | 0~+1100 | ± 2.5C | 0~600 |
| ± [1+0.003(t-1100)] | 1100~1600 | ± 0.004|T| | 600~1600 | ||
| WRQ | R | ± 1C | 0~+1100 | ± 2.5C | 0~+1100 |
| ± [1+0.003(t-1100)] | 1100-1600 | ± 0.0025|T| | 1100~1600 | ||
| WRR | B | --- | --- | --- | --- |
| --- | --- | ± 0.00425T| | 600~1700 | ||
| Type | Graduation | Temperature range | Accuracy class | Tolerance |
| WZP | Pt100 | -200~+500 | A | ±(0.15+0.002)|t| |
| B | ±(0.30+0.005)|t| | |||
| WZC | Cu50 Cu100 | -50~+100 | -- | ±(0.30+0.005)|t| |
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