Showing all 3 results
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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
$195Select options -
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
$195Select options -
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 – $550Select options
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
- 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