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Thermocouple transmitters convert Type J, K, T, E, R, S, B, or N thermocouple sensor input signals to 4-20mA or 0-10V DC outputs for interfacing to controllers or other instrumentation.

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    DT233: Thermocouple / milliVolt Input Two-Wire Dual Transmitter

    • Dual channels
    • Universal thermocouple, mV input
    • 4-20mA outputs (sink/source)
    • 7-32V DC loop/local
    The DT233 model is a dual two-wire transmitter that isolates and converts millivolt or thermocouple sensor inputs to proportional 4-20mA control signals. Power is received from the output loop current.

    Click here to watch a short video highlighting the features of the DT233.

     
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    TT233: Thermocouple / milliVolt Input Two-Wire Transmitter

    • Universal TC type J, K, T, R, S, E, B, N or ±100mV input
    • 4-20mA ouput (sink/source)
    • 12-32 V DC loop/local power
    The TT233 model is a space-saving two-wire transmitter that isolates and converts a millivolt or thermocouple sensor input to a proportional 4-20mA control signal. Power is received from the output loop current or a DC supply when using a three-wire connection. Click here to watch a short AcroMaggie video highlighting the TT230 Series.        
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    655T, 656T: Single or Dual Channel, Thermocouple/milliVolt Input, Loop-powered Transmitter

    • TC (types J, K T, R, S, E, B, N), ±1V DC, selectable range/type input
    • 4 to 20mA DC output
    • 12-50V DC from output loop power
    • DIP-switch configuration, signal linearizer, push-button calibration
    These units accept universal thermocouple and millivolt input signals, provide isolation, and output proportional DC current signals. The output can also be linearized to the input sensor signal.  
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    ST132: Thermocouple/milliVolt Input Head-mount Transmitter

    • Universal thermocouple (8 types) or ±100mV input
    • 4-20mA output
    • Loop-powered, 7-32V DC
    The ST132 is a low-cost two-wire transmitter that converts a millivolt or thermocouple sensor input to a proportional 4-20mA control signal. Power is received from the output loop current. The transmitter performs signal linearization, cold-junction compensation, and lead-break detection functions.  
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    ST133: Isolated Transmitter; Thermocouple/mV Input

    • TC type J, K, T, R, S, E, B, and N or ±100mV input
    • 1500V isolation
    • 4 to 20mA DC output
    • USB-configured
    The ST133 is a low-cost two-wire transmitter that isolates and converts a millivolt or thermocouple sensor input to a proportional 4-20mA control signal. Power is received from the output loop current. The transmitter performs signal linearization, cold-junction compensation, and lead-break detection functions.    
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    250T-TC, 350T-TC, 450T-TC Loop, DC, or AC-Power Transmitter

    • J, K, T, E, R, S, B Thermocouple Input
    • DC Voltage or DC Current Output
    These models convert sensor inputs to proportional process current or voltage output signals. Excellent accuracy and stability ensure reliable measurements in harsh industrial environments.    
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Thermocouple Temperature Transmitters - Continued

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Points of Consideration When Using Thermocouples to Measure Temperature 

Thermocouples work by the temperature difference between one end of a conductor and the other end that produces the small electromotive force (emf), or charge imbalance, that leads us to the temperature difference across the conductor.

OK, simple enough, but how do you actually measure this emf in order to discern its relationship to temperature? 
Read Temperature Measurement Using Thermocouples Industry Technology Paper for more detailed information.

Since accuracy will ultimately play a significant role in selecting a sensor type, we should be familiar with potential sources of error when making temperature measurements with thermocouples. Some of these considerations may steer us from one T/C type to another, or perhaps to another sensor type, like RTD transmitters for example.

12 Points to Consider When Using Temperature Thermocouple Transmitters

  1. Thermocouple Sensor Inaccuracy
  2. Thermocouple Sensor Non-Linearity
  3. Thermocouple Sensor Sensitivity
  4. Sensor Drift, Aging, and De-Calibration
  5. Choice of Extension Wire
  6. Response Time
  7. Cold Junction Compensation
  8. Connection Problems
  9. Thermal Shunting and Immersion Error
  10. Lead Resistance
  11. Noise
  12. Common-Mode Voltage