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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    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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    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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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