Showing all 10 results
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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
Click here to watch a short video highlighting the features of the DT235.
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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
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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
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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
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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
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801T: Universal Input Intelligent Temperature Transmitter
- Thermocouple, RTD, milliVolt, and Resistance Input
- 0 to 20mA DC, 0 to 10V DC output
- Limit Alarm
- 10-36V DC power
- Software configured
- Performs linearization, square root extraction, and optional limit alarm functions
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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
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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
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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
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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
RTD Input Temperature Transmitters - Continued

Resistance temperature detectors (RTDs) are sensors that measure temperature by measuring the electrical resistance of a material. RTDs are made from materials such as platinum, copper, or nickel, and the resistance of the material changes with temperature in a predictable way. RTDs are known for their high accuracy and stability, making them a popular choice for temperature measurement in a variety of applications.
Platinum RTDs are particularly popular because platinum has a very high resistance temperature coefficient, meaning that the resistance of the platinum element changes significantly with temperature. This results in a very high sensitivity to temperature changes, which allows platinum RTDs to achieve high accuracy and precision in temperature measurement.
RTDs are generally more accurate and stable than thermocouples, which are another type of temperature sensor that work by measuring the voltage generated by the junction of two different metals. However, thermocouples have a higher operating temperature range than RTDs and can be used in applications where RTDs would be damaged by the high temperatures.
In summary, RTDs are a good choice for temperature measurement when high accuracy and stability are required, particularly in applications where the temperature is below about 800°C. Thermocouples are a good choice for applications where the temperature is higher, but they are generally not as accurate as RTDs.
Top Considerations When Selecting RTD Types
- The RTDs Temperature Coefficient of Resistance (TCR)
- Its relative sensitivity
- Its accuracy and repeatability
- Interchangeability
- Stability and drift characteristics
- Insulation resistance
- Its response time
- Its packaging and the thermal transfer mechanism between the sensed material and the sensor element.
- The negative effects of corrosion and contamination
- Shock and vibration
- Self-heating
- Meter loading
- And in some cases, even thermoelectric effects
Learn more about temperature measurement in this Technical Paper