Tire Minder TPMS

[robandbarb]

I just installed a Tire Minder tm-77.

I checked tire pressure and adjusted to proper pressure with a Tire Minder  tmg-aaa RV digital guage. The pressure on my tm-77 unit does not match the pressure with my tire minder gauge a difference of 1 to 7 lbs on my RV.  The car I am towing is pretty actuate on pressure with tire minder unit vs the tire minder digital pressure gauge .

Any help on this would be appreciated. We are leaving for Thor rally Sun. morning in Goshen.

[elkhartjim]

The sensors are ± 3 - 5%.  If you have one registering 3% lower and one registering 5% higher, you could have a sizable variance in pressures.

 

[desertdeals69]

One of the important things is that it will give you information of a variation in pressure of each tire as you run.

[wildebill308]

Assuming you have weighed the coach and set tire pressure to the tire manufacturers chart + 10% or I just use + 10 lbs as it is easier. I would use a known accurate gauge to set the base pressure and the record what the Tireminder read. See how much it changes on the trip. 

Bill

[tireman9]

I have addressed the topic of TPMS "Accuracy" HERE

I have also done some calibration checks after my seminars at a few FMCA Conventions using my digital gauges that are accurate to =/- 0.5 psi when checked against ISO laboratory gauge

 

What we see is that about 10% of the gauges are off by more than 5 psi at the 80 psi level I use as a standard  Some are off by 10 psi or more !

NOTE simply paying more for a gauge is no confirmation that the gauge is accurate. My three "Master gauges only cost $10 each

 

HERE is a post on my test results.

[wayne77590]

I don't worry about what the TPMS says I inflate accordingly and use a calibrated gauge. Then I look at the TPMS and it will always read differently. From that point on it is nothing more than a reference and if something does go wrong with a tire it will notify me according to the values I set.  Any gauge is really nothing more than a reference point, even the calibrated ones but they are real close to being correct. Reference point is all I need.  If I set a tire to 110 psi and the gauge reads 108 psi then when the gauge reads 108 psi i know there is 110 psi in the tire.  + or  - 10% from either value is only about 1 psi difference. Just a reference point.

It's still frustrating that the TPM can't be more accurate.