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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
- The RTDs Temperature Coefficient of Resistance (TCR)
- Its relative sensitivity
- Its accuracy and repeatability
- 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
- Meter loading
- And in some cases, even thermoelectric effects