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WRR-231 WRR-230 WRR-223 WRR-232 WRR-233 B thermocouples

Home Products Shanghai Automation Instrumentation No. 3 Factory Thermocouples WRR-231 WRR-230 WRR-223 WRR-232 WRR-233

WRR-231 WRR-230 WRR-223 WRR-232 WRR-233 B thermocouples

  • Category:Thermocouples
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    Description

    WRR-231 WRR-230 WRR-223 WRR-232 WRR-233 B thermocouples

    Product introduction:

    WRR-231 WRR-230 WRR-223 WRR-232 WRR-233 B thermocouples, a varistor is a resistor whose resistance value changes with voltage within a certain range of current and voltage, or a resistor whose "resistance value is sensitive to voltage". The abbreviation is VDR. The material of the resistor body of a varistor is a semiconductor, so it is a variety of semiconductor resistors. "Zinc oxide" (ZnO) varistor is now used in large quantities. What is the use of a varistor? The biggest feature of a varistor is that when the voltage applied to it is lower than its threshold "UN", the current flowing through it is extremely small, which is equivalent to a closed valve. When the voltage exceeds UN, it flows through Its current surge is equivalent to the valve opening. With this function, abnormal overvoltages that often occur in the circuit can be suppressed, and the circuit can be protected from damage by overvoltage. Now the zinc oxide voltage is used in the power circuit of our home color TV The threshold voltage of the varistor used here is about 270V. When the power supply voltage is less than 270V (normal value is 220V), it is equivalent to non-conducting. When the power supply is abnormal and exceeds 270V for a short time, it will conduct ON, limiting the voltage to 270V, Anderson has upgraded the varistor.


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    Product Categories

    • 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 valve
      • Pneumatic valve
      • Manual Valve
      • Electric Actuator
      • Electric Valve Actuator
      • Pneumatic Actuator
      • Electric Actuator Accessories
    • 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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