Immersion Methods of RTD Probes

An immersion sensor is one of the most reliable and accurate ways to measure temperature. There are two primary ways to install immersion sensors into the system; direct and indirect.

The direct method involves installing the RTD assembly directly into the system (Figure 1), through the wall of a pipe or vessel for example. This can be accomplished through a number of process fittings which are specific to the application.

• Faster response time
• Lower cost

The Indirect method incorporates a separate thermowell (Figure 2). With the thermowell properly installed, there is no contact between the fluid or gas and the RTD sensor assembly itself.

• Isolation from high pressures, high flow rates and corrosive effects
• Option to remove the sensor if needed without breaching the system

The disadvantage is generally a slower response time.

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