• Thermal Resistance/Thermocouple
  • Thermal Resistance/Thermocouple
  • Thermal Resistance/Thermocouple
  • Thermal Resistance/Thermocouple
Thermal Resistance/Thermocouple
  • Applicable Medium
    Liquid/Gas
  • Not applicable medium
    Solid
  • Product Introduction
    RTD is a temperature sensor that measures temperature using the property that the resistance value changes with temperature.RTDs are mainly used in temperature measurement fields that require high accuracy and stability, such as industrial process control, laboratory research, temperature calibration, etc.

工作原理

Armored thermal resistance uses the characteristics of a substance that changes in temperature and its resistance changes with it to measure temperature. When the resistance value changes, the working instrument will display the temperature value corresponding to the resistance value. As a temperature sensor, industrial assembled thermocouples are usually used in conjunction with display instruments, recording instruments and electronic regulators.


Armored thermal resistance uses the characteristics of a substance that changes in temperature and its resistance changes with it to measure temperature. When the resistance value changes, the working instrument will display the temperature value corresponding to the resistance value.

As a temperature sensor, industrial assembled thermocouples are usually used in conjunction with display instruments, recording instruments and electronic regulators. The assembled thermocouple can directly measure the surface temperature of liquid vapor and gaseous media and solids in the range of 0℃ to 1800℃ in various production. According to national regulations, our company produces assembly thermocouples such as platinum rhodium 30-platinum rhodium 6, platinum rhodium 10-platinum, nickel-chromium-nickel silicon, nickel-chromium-constantan, etc., which meet the IEC standard index number. Assembling a thermocouple is usually composed of main components such as temperature sensing elements, installation fixtures and junction boxes.


Product Features

Features of WZP-231 armored thermal resistance

●The thermal response time is less, and the dynamic error is reduced;

●Small diameter, unlimited length;

●High measurement accuracy;

●Imported thin-film resistor elements, reliable and stable performance;


Features of WZP-231 armored thermal resistance

●High measurement accuracy. The working mode of the thermocouple is that it can directly contact the substance to be measured, so the temperature of the thermocouple can be more directly sensed, so the temperature measurement is more accurate.

●The measurable temperature range is relatively large. There are different types of thermocouples. Some thermocouples are resistant to high temperatures and can measure temperatures even exceeding 2800℃. Some thermocouples are also very resistant to low temperatures due to their special materials. They can measure temperatures of -269℃. This can be used in many fields to help We measured the temperature under different conditions.

●The thermocouple is easy to operate, easy to use, and highly efficient. The structure of the thermocouple is relatively simple, composed of two different metal wires, and is not limited by the size and the beginning, and there is a protective sleeve outside, which is safe and reliable.

●The thermocouple is relatively stable, because its material is made of more expensive metal materials, so its stability is also better, which can help us better measure the stable temperature.


Technical Parameters

1、Basic parameters

Thermal resistance parameters

◆Measuring range and tolerance



Model NumberIndex NumberTemperature Range °CAccuracyClass Tolerance
WZPPt100-200~500Class A±(0.15+0.002 ltl)
WZPPt100-200~500Class B±(0.30+0.005ltl)
◆Casing diameter thermal response time



Casing diameterthermal response time


Ф3≤3


Ф4≤5


Ф5≤8


Ф6≤12


Ф8≤15



Armoured thermocouple measurement range and allowable error range:
Thermocouple categoryMeasuring rangeBasic error limit 
Ni-Cr-Constantan0-800℃±0.75%t
Ni-Cr-Ni-Si0-1300℃±0.75%t
Platinum rhodium 13 -platinum0-1600℃±0.25%t
Platinum rhodium 10 -Platinum0-1600℃±0.25%t
Platinum rhodium 30 -Platinum rhodium 60-1800℃±0.25%t
Note: t is the measured temperature value of the temperature sensing element (℃)

Thermocouple time constant
Thermal inertia levelTime constant (seconds)    
44499
<10


Nominal pressure of thermocouple: generally refers to the static external pressure that the protection tube can withstand at working temperature and breaks.


Minimum insertion depth of thermocouple: should not be less than 8-10 times the outer diameter of its protective tube (except for special products)


Insulation resistance: When the surrounding air temperature is 15-35℃, and the relative humidity is less than 80%, the insulation resistance is ≥5 megohm (voltage 100V). Thermocouple with splash-proof junction box, when the relative temperature is 93±3℃, the insulation resistance is ≥0.5 megohm (voltage 100V)


Insulation resistance at high temperature: At high temperature, the insulation resistance between the thermocouple (including double-branch type) and the protection tube and the double-branch hot electrode (calculated per meter) should be greater than the value specified in the following table.

Specified long-term use temperature (℃)   Test temperature (℃)  Insulation resistance value (Ω)  
≥60060072000
≥ 80080025000
≥100010005000


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