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Old 10-03-2016, 06:37 AM   #29
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For the 507 and 507RV-Flow Thru units, TST claims 1.5psig accuracy in their current manuals. Mine are in the 2-3 pound low range. This doesn't bother me if they are not consistent with a spec and I know where I started (80 psig in my LT tires on our 5er set by a good gauge). I also look at temperature rise from starting ambient vs the gauge on my TV's dash and the external temp on the digital thermometer in the RV. Again, if we haven't moved yet, that temp and pressure reading can be different from side to side depending on how long the sun has been 'beating' on the tire. After all that, I'm more concerned with sudden high or low delta T and/or P after driving a distance rather then an absolute. These inexpensive measuring gadgets - and they really are - just are not capable of those kinds of tight parameters.

Know what your tire pressure is when you start as well as temps then look for sudden changes either up or down is really about all the real information these TPMS can tell you regardless of advertising.

Disclaimer: My opinion and how I use my TST unit, others may and will have theirs
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Old 10-03-2016, 06:53 AM   #30
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I use a gauge to set the pressures and the TST to warn me of any issues while driving, the exact pressures and temperature don't really matter but the extreme changes are what I'm concerned with.
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Old 10-03-2016, 08:42 AM   #31
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IMO calibrated gauges and sensors must be checked routinely for accuracy. While they may be accurate when they are first purchased there are any number of situations that could occur to cause them to be slightly inaccurate.

Is it possible a small piece of dust or tire debris entered the gauge from the tire or when checking tire pressure?

I am satisfied when all of the tires have similar pressure. If the tires are within a couple lbs with the gauge, the TPMS is within a couple lbs I feel I have a baseline to monitor the pressure.

To check my gauge I will go to our local tire store and get them to check a couple tires with their gauge (supposedly calibrated) and use my tire gauge as a comparison. I note the difference between the gauges and subsequently compensate with my tire gauge.

TPMS is a great tool for "in motion" tire pressure monitoring.
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Old 10-03-2016, 09:40 AM   #32
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Tire SafeGuard TPMS

The Tire SafeGuard TPMS monitor has a calibration mode where it can be adjusted up to + or - 9 lb's in order to compensate for differences between your gauge and the monitor.

It will NOT do each sensor individually only a global correction.

Here is an exert from the operators manual.

"While the TPMS provides sufficiently accurate tire pressure measurements, some user might prefer to use manual gauge readings as points of reference. In the event that there is a discrepancy between gauge and TPMS readings, user may adjust the Pressure Reading Calibration value for reconciling the measurements differences. A negative Calibration value subtracts from the TPMS readings while a positive value adds to it. Thus if on average the TPMS readings are 2 PSI higher than the gauge, a Calibration value of -2 would bring the TPMS readings down to the gauge level, so that when the user sees a pressure reading on the display he or she would know it is close to the gauge measurement. After adjusting the Calibration value its effect is applicable to new measurements, so the display will show the reconciled readings when receiving fresh sensor signals, such as while the vehicle is moving."

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Old 10-03-2016, 06:40 PM   #33
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Thanks campdaven. I feel better now. My TPMS says to use 20% increase as a high pressure alarm. Maybe I'll moved that up a bit and see what happens. Again thanks.
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Old 10-03-2016, 06:44 PM   #34
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Originally Posted by Mike_Harriet View Post
Thanks campdaven. I feel better now. My TPMS says to use 20% increase as a high pressure alarm. Maybe I'll moved that up a bit and see what happens. Again thanks.

Thanks for the kudos, but I had to get used to mine and readjusted the parameters twice!
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