RTD failure: What to do if the sensor breaks?

Q&A System Integration Temperature

If the RTD sensor broke, what will happen? I found the signal in the PLC display didn't change after I disconnect the sensor, I am afraid if the sensor fail in someday and the interlock will not active.

Expert’s answer: What to do if you experience an RTD failure?

Your temperature transmitter should detect the presence and condition of the sensor, also an RTD failure. If the sensor hasn’t been installed or doesn’t work properly, the transmitter will go to failure mode!

So you have concerns about your interlock. If you think your sensor will fail or has failed, you may need to upgrade your sensor, for safety if nothing else.

NAMUR NE 107 RTD failure
NAMUR NE 107 – Courtesy of NAMUR

You could also install another sensor on the application as a backup. If you have problem in the first sensor, then the transmitter will switch automatically to the second. It’ll also send a diagnostic about the failure on the first sensor.

Whatever you decide to do, I suggest you do it as soon as possible. You have many good options now, and while they all may cost more, you have your safety issue to consider.

Here are some of the best solutions for your application:

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