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Temperature Q&A with JR Madden: What Thermowell and Thermocouple Type Should I Use with my High Temperature Application?

Temperature Q&A with JR Madden: What Thermowell and Thermocouple Type Should I Use with my High Temperature Application?

Q. I have a temperature application that requires a 12-inch thermowell which can withstand a high temperature of 2,000°F. Most of what we have been using becomes brittle and breaks off at the tip. What would you suggest we use, and what type of sensors do you have that will work for us?

A. We have several different types of metals we can suggest with maximum temperatures up to 2,160°F. Materials that will work well for the thermowell in your application are SS446, SS310, and Inconel 600.

For the sensor type, we recommend a thermocouple Type “K” with Inconel 600 material for the sheath. Also, using 2-inches of thermal-lagging for the thermowell will reduce heat going into the head.

If possible, remote mount the temperature transmitter away from the process connection. Even though Moore Industries temperature transmitters are rated up to 185°F, it could get too hot inside the head if it were mounted directly on top of the process. If you must mount the transmitter near the process connection, we suggest using a stainless steel housing and a ceramic terminal block to terminate the sensor at the process.

Published: March 30, 2016
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