As the use of TPMS in the RV world continues to spread, I am noticing a number of comments on usage, pressure and temperature accuracy and general reliability of different systems.
I am in the process of making a test fixture to allow calibration check of pressure and possibly of temperature reporting also. I hope to have the first round of testing in a few weeks. I have a target of offering a "TPMS Pressure Test" in August in West Springfield at the FMCA Reunion for folks to learn the actual accuracy of their individual system. I will collect and report the findings in Sept.
As I do some initial runs, I am noting some interesting results and readings that need additional investigation as I am not always seeing numbers that I am expecting. This is especially true when it comes to temperature readings.
One thing I have learned is that it might be a good idea for everyone to do one test on their own unit.
With all tires properly inflated you can confirm that your system can provide a quick response and that your monitor is receiving the radio signal properly. With someone watching the monitor, go and quickly unscrew the sensor and have the person watching the monitor beep the horn as soon as the sensor issues its warning. Hopefully you will see that your system consistently reports the loss of pressure the sensor is seeing in one or two seconds.
Be sure to securely re-attach the sensor and maybe even give it a little squirt of soapy water or even Windex to check for leaks. I certainly do not want anyone reporting back that they had a tire failure because they lost air due to a loose sensor.
A side note. My sensors, and I believe many others do, have an "O" ring seal around the battery chamber. As with any device containing a battery that is exposed to water, I give the battery chamber a little squirt of WD-40 to help prevent corrosion of electrical components. You might take this opportunity to also inspect the "O" ring for tears or cracks. Don't forget this little rubber piece ages just as rubber tires do. I keep a couple spare "O" rings on hand just in case. Your TPMS supplier should have a package of replacements for a nominal fee or you can pick up some at your next RV convention or show.
If you have a monitor that is small and portable, I suggest you not carry it around with you as one of the features we want to test is the ability of the monitor to receive the signal over the distance from the tire to the location you have mounted the monitor. This would especially be important for those monitoring sensors on a toad. You don't have to actually hook up the toad but at least park it in an appropriate location and distance behind the RV.
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