RTD Input - Temperature Transmitters convert Platinum, Copper, Nickel RTD or resistance sensor input signals to 4-20mA or 0-10V DC outputs for interfacing to controllers or other instrumentation.  

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    DT235: RTD / Resistance Input Two-Wire Dual Transmitter

    • Dual channels
    • RTD (Pt, Ni, Cu), 0-4500 ohm inputs
    • 4-20mA output (sink/source)
    • 7-32V DC loop power
    The DT235 model is a two-wire dual transmitter that isolates and converts RTD or linear resistance sensor inputs to a proportional 4-20mA control signal.

    Click here to watch a short video highlighting the features of the DT235.

           
    $290
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    DT335: RTD/Resistance Input Four-wire Dual Transmitter

    • Dual channels
    • RTD (Pt, Ni, Cu) or 0-4500 ohm input
    • 0-20mA, ±10V outputs
    • 6-32V DC local/bus power
    The DT335 model is a four-wire dual transmitter that isolates and converts RTD or linear resistance sensor inputs to proportional control signals. Click here to watch a short video highlighting the features of the DT335.
    $340
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    TT231: RTD / Resistance Input Two-Wire Transmitter

    • 100 ohm Pt RTD or 0-900 ohm input
    • 4-20mA output (sink/source)
    • 12-32V DC loop/local power
    • USB configuration
    The TT231 model is a space-saving two-wire transmitter that converts a 100 ohm Platinum RTD sensor input to a proportional 4-20mA 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.
    $195
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    VPM3000 Series: Universal Transmitter / Alarm with Display

    • Big, bright display
    • 4-20mA, ±10V, thermocouple, or RTD input
    • 4-20mA, Modbus serial, or alarm relay output options
    Acromag VPM3000 Vertu™ digital panel meters are among the most versatile on the market and able to operate as a transmitter and/or alarm to satisfy a wide variety of process and temperature applications. Learn more about the VPM3000 by watching this short video.    
    $345 – $545
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    657T, 658T: Single or Dual Channel, RTD Input, Loop-powered Transmitter

    • 100 ohm Pt, 120 ohm Ni, 10 ohm Cu (selectable type) input
    • 4 to 20mA DC output
    • 12-50V DC from output loop power
    • DIP-switch configuration, push-button calibration
    These units accept universal RTD or resistance input signals and output proportional DC current signals. The output can also be linearized to the input sensor signal.
    $295 – $490
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    801T: Universal Input Intelligent Temperature Transmitter

    • 0 to 20mA DC, 0 to 10V DC output
    • Mechanical relay (25V @ 5A) alarm
    • 10-36V DC power
    • Software configured
    • Performs linearization, square root extraction, and optional limit alarm functions
    These transmitters isolate and convert sensor inputs to noise-free, proportional DC current or voltage output signals. An optional relay output adds a local limit alarm function.      
    $390 – $540
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    ST131: Transmitter, RTD Input, Loop-Powered

    • 100 ohm Pt RTD or 0-900 ohm input
    • 4 to 20mA DC output
    • 9-32V DC from output loop power
    • USB-configured
    The ST131 is a low-cost two-wire transmitter that converts a 100 ohm Platinum RTD sensor input to a proportional 4-20mA signal. Power is received from the output loop current.
    $120 – $140
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    TT235: Isolated RTD Input, Loop Power, 2-Wire Transmitter

    • Selectable RTD or linear resistance input type or 0-500 ohm input
    • 4-20mA output (sink/source)
    • 12-32V DC loop/local power
    • USB configuration
    The TT235 model is a space-saving two-wire transmitter that isolates and converts an RTD sensor input to a proportional 4-20mA 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.
    $195
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    TT335: Isolated RTD Input, DC Local/Bus Power Transmitter

    • Selectable RTD or linear resistance input type or 0-500 ohm input
    • Universal output (source)
    • 12-32V DC local/bus power
    • USB configuration
    The TT335 model is a space-saving four-wire transmitter that isolates and converts an RTD sensor input to a proportional control signal. DC current and voltage output are both supported on a single model. Click here to watch a short video highlighting the TT330 Series.
    $265
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    uB34, uB35: Platinum RTD Field Input Module

    • Bluetooth® wireless configuration option
    • Platinum RTD (2,3, or 4-wire) field input
    • Voltage host output
    The uB34 and uB35 models condition and convert a Platinum RTD sensor or resistance signal to a scaled 0-5V or ±5V output. Both models provide sensor excitation, linearization, lead-wire compensation, lead-break or sensor burnout protection, and input isolation. Click here to watch a short AcroMaggie video highlighting the features of the microBlox® Series.  
    $135 – $240
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    250T-RB, 350T-RB, 450T-RB Loop, DC, or AC-Power Transmitter

    • Platinum RTD or Copper RTD (resistance temperature sensor) Input
    • DC Voltage/Current Output
    $475 – $550
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RTD Input Temperature Transmitters - Continued

RTD technology provides an excellent means of measuring the average temperature over a surface by spreading the resistance wire over that surface, and this ability to average temperature over a surface area (or an immersion depth) will be more desirable for some applications. The use of a platinum RTD sensor may be preferred when a temperature measurement accuracy of better than 1°F or 1°C is required. By comparison, thermocouple accuracy will be on the order of 2°C to 4°C, typical. However, for point-of-contact measurement at temperatures above about 800°C (the maximum temperature at which platinum RTDs can be used), a thermocouple is the better choice due to its higher rated operating temperature.

Top Considerations When Selecting RTD Types

  1. The RTDs Temperature Coefficient of Resistance (TCR)
  2. Its relative sensitivity
  3. Its accuracy and repeatability
  4. Interchangeability
  5. Stability and drift characteristics
  6. Insulation resistance
  7. Its response time
  8. Its packaging and the thermal transfer mechanism between the sensed material and the sensor element.
  9. The negative effects of corrosion and contamination
  10. Shock and vibration
  11. Self-heating
  12. Meter loading
  13. And in some cases, even thermoelectric effects

Learn more about temperature measurement in this Technical Paper