How to isolate a temperature probe
This article explains how to isolate a temperature probe using Teflon tape to reduce erratic temperature fluctuations.
Written by Nikolett Takacs
Updated at April 28th, 2025
Table of Contents
If you're experiencing erratic temperature fluctuation or interference while using ungrounded probes, there can be a few reasons why.
One common reason for erratic readings is that the probe itself may be grounded through contact with the roaster's probe mounting location.
The best way to prevent this issue from affecting you is to isolate your probe from the roaster.
Requirements
- Compression Fitting
-
Teflon Tape
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Isolating the probe
Turn off the roast machine and remove the probe from the roast machine, and take off the compression fitting.
- Start by wrapping the Teflon tape beginning at the base of the probe as shown below.
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- Once wrapped, twist the metal bushing onto the base of the probe, going with the Teflon tape, to avoid bunching up the tape.
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- Inset the nylon bushing (white cylinder in photo above) then the fitting and screw the end cap on to the fitting. A finished setup is shown below.
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Depending on your mounting location, it may be easier to secure the fitting into your roast machine first, then mount the probe to the fitting.
Congratulations! You have successfully learned how to isolate a temperature probe.
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