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Old 07-14-2019, 06:49 PM   #1
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TPMS temperature readings

Just curious.. How can tire temperatures be accurately measured by a stem-mounted TPMS sensor spinning in free ambient air?

Inquiring minds want to know....Well, mine does anyway..How does it accurately sense temps?

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Old 07-14-2019, 06:56 PM   #2
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I'm actually wondering that too... I know the TPMS reports a much lower temperature than I get when I check the tire surface and/or hub with an IR remote thermometer.

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Old 07-14-2019, 06:58 PM   #3
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They can't. The benefit of a temp monitor in the TPMS is the ability to compare tire temps. If 3 of 4 tires are running at 90F and one is 120F you have a potential issue. The temp will vary from one side of the RV to the other if the sun is at a low angle.

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Old 07-14-2019, 07:04 PM   #4
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The sensor is not just on a stick. It's on a hollow tube/stem whose chamber goes into the tire. That's how air gets in when you pump air into a tire. So, the air in the tire as it rolls around is fairly consistent, and some of that same temp air eases up into that hollow tube called a stem. On the end is the sensor.
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Old 07-15-2019, 03:48 PM   #5
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You are basically getting the rim temp, not the air temp. And even then, if it's a rubber valve stem or a metal valve stem that rubber insulated, it will be off a bit. I have not heard yet of a person who has detected a malfunction due to something like a dragging brake but I am sure it might be possible.

Bottom line, look for temps on one sensor that are a lot different than the one that is on the same side of the trailer or all of them if you are traveling at night.
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