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Home News Industry-news Principle, material and error of thermal...

Thermal resistance type temperature sensors are designed by using metal resistance with temperature changes. The use of thermal resistance to make temperature sensors is mainly due to higher stability and accuracy. Common thermal resistances are platinum resistance and copper resistance. The relationship between resistance and temperature of most metals is:

Rt = R0 [1 + α (t-t0)]

The thermal resistance temperature sensor materials are divided into temperature sensing materials, protective materials and insulating materials. In addition to platinum and copper, the temperature-sensing materials include nickel, iron, and tungsten. The protective material is the protective sleeve. Stainless steel, carbon steel, copper alloy, ceramics, quartz, etc. are often selected, which is mainly used in the environment of oxidation, corrosion and high temperature. Insulation materials are mainly ceramic and organic materials. Ceramic materials can be used at 500 degrees Celsius. Organic materials can only be used at 250 degrees Celsius, otherwise the insulation performance will be reduced.

The measurement error of thermal resistance includes the error of introducing R0, the error of the index table of the thermal resistance, the error caused by the self-heating effect, the error of its own stability, the error caused by insufficient insulation, the error of the lead and the dynamic response error, etc. Some of them are system errors and some are measurement errors. Try to reduce the corresponding error value according to the actual situation.


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  • Shanghai Automation Instrumentation No. 3 Factory
    • Thermocouples
    • Thermal resistance
    • Bimetal thermometer
    • Temperature transmitter
    • Non-contact thermometer
  • Shanghai Automation Instrumentation No. 4 Factory
    • Pressure guages
    • Pressure transmitters
    • pressure controllers
  • Shanghai Far East Instrumentation Factory
  • Shanghai Automation Instrumentation No. 5 Factory
    • Ultrasonic Level Meter
    • Magnetic Level Gauge
    • Magnetostrictive Liquid Level Transmitter
    • Radar Level Meter
    • Electric Float Level Transmitter
    • Floating Ball Level Meter
    • Floating Ball Liquid Level Switch
    • Radio frequency admittance switch
    • Input-Type Liquid Level Transmitter
    • Tuning Fork Level Switch
    • Intelligent Radar Level Meter
    • Resistance level switch
  • Shanghai No. 9 Automation Instrumentation Co., Ltd.
    • Electromagnetic Flowmeter
    • V-Cone Flowmeter
    • Glass Rotor Flowmeter
    • Metal Tube Rotor Flowmeter
    • Throttling Device
    • Ellipse Flowmeter
    • Vortex Flowmeter
    • Turbine Flowmeter
    • Wedge Flowmeter
    • Sliding vane flowmeter
    • Roots flowmeter
    • Flow Switch
  • Shanghai Automation Instrumentation No. 11 Factory
    • Electric Actuator
    • electric-pneumatic valve positioner
    • angle electric actuator
    • Intelligent electric actuator
  • Shanghai Automation Instrumentation No. 7 Factory
    • Electric control valve
    • Pneumatic control valve
  • Shanghai Automation Instrumentation Co., Ltd.
  • Shanghai ZiYi Marine Instrument Co.,Ltd
    • Frequency Meter
    • Ammeter
    • Power Factor Meter
    • Voltmeter
    • Current voltmeter
    • Controllable Voltage Regulator
    • Megger
  • Shanghai Automation Instrument Tachometer and Instrument Motor CO.,LTD
    • Fixed magnetic tachometer
    • Handheld centrifugal tachometer
    • Rotating speed digital displayer
    • Electric tachometer
    • Non-contact handheld digital tachometer
    • Standard speed generator
  • Shanghai Dahua Instrument Factory
    • Automatic balanced recorder
    • Circular chart recorder
    • Intelligent digital display regulator
    • Intelligent data logging device
  • Shanghai Hua Dong Electronic Instrument Factory
    • Weighing sensor
    • Weighing controller
    • Weighing amplifier
    • Weighting Resistance Strain Meter

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