TPMS

Dutch & Di wrote:
It seems like it is your way or no way.
Your excerpt:
If you think your valve monitor would have provided the same warning then show me the physics and if you are mathematician show me the surface integral of heat dispappation:
to me means I have to prove something to you. I don't. I know my system alerted me in time to save much more damage. What you feel about me, my education and knowledge of physics is just your way of puffing out your chest. So puff away. As I said, I don't have to prove/show anything to you. You are entitled to your opinion as I am in mine.To me, that is all that matters.
Our alarm went off as we were leaving the road to turn into a Verizon store. We did not have to be stopped for the high temperature to show up & the alarm to sound.
When I replied to you, I never said you were wrong. A courtesy extended to you but not returned. I said: This was not the case for us. You, one the other hand apparently believe everyone but you is wrong. Di

justme wrote:
I trust my in-tire sensor because it is mounted to the rim inside the tire and therefore will sense the change in temperature much faster than a valve stem sensor. It is the change in temperature vs time that IMHO is important. I suppose the valve sensor will eventually see the temperature change, but will it be show it in time for you to take action before permanent damage occurs to the axle? I saved my axle because I seen a small abnormal temperature rise of 5 degrees and I simply don't see how a valve stem temperature monitor would have detected that small increase in short period of time. After stopping to see what caused the temperature increase, I measured the hub with my IR gun and showed 180 deg while the temp monitor showed 135 vs a normal 130 the temperature monitor eventually went to 170 deg after stopping.
If you think your valve monitor would have provided the same warning then show me the physics and if you are mathematician show me the surface integral of heat dispappation ;-)

This might help understand temperature and rate of distribution..https://www.khanacademy.org/math/multivariable-calculus/surface-integrals/surface_integrals/v/introduction-to-the-surface-integral
It is not my way or no way, but physics.

RustyJC wrote:
The behavior you're observing from your TST system seems strange to me. I have the TST 507 system with flow-through sensors and trailer repeater, and mine seems to respond very well. I'll generally see a cycle-to-cycle variation of perhaps 1 psig and/or 1 degF on a given tire once we're on the road and everything has stabilized under steady-state conditions.

You're right, though - if the TST system doesn't pick up a signal, it will display the last reading for quite awhile (probably to prevent "lost signal" nuisance alarms, which I've had when I forgot to plug in the repeater). I notice this when we unhitch from the 5th wheel and drive away without switching the trailer tire display off - the trailer tires will still be displaying the last readings obtained when I'm 5 miles away from the 5th wheel.

Rusty

I called TST and I have to send everything in to them and they are going to take a look at it. I did ask him about how long it takes for the receiver to report a loss of signal, he told me it is 15-20 minutes. To me this seems way too long, if you lost a valve stem you wouldn't know to the tire was in shreds.... I was expecting may be 5 minutes at the most.

But I will send it off and see what they come up with.

I don't know about the accuracy and speed of change but I can say it does respond. Fact in case. When I pull of the highway, pit stop or whatever, the temperature of the tires goes up usually 5-10 degrees fairly rapidly. I attribute it to lack of airflow cooling the tires. While not as accurate as in the tire it is seeing a change and reporting it. I watch the temperature and compare to the other tires. Not looking absolute temperature. I know my setup and they all run about the same, except for sunny side hotter than shady side. A variation is what I look for.

I wish I could find the pictures of our experience. Long story short, four years ago this coming April, traveling north out of Los Vegas on 15. TST TPMS system alarm goes off. Pull over, find a burnt bearing. Call Coach-Net, all taking care of, had four days left on my warranty, no cost to me. Thank the good Lord!!!

About two months later read on the internet about individual with same RV and truck as I have who also burns a bearing on his RV. He does not have a TPMS system. RV goes up in flames but he was able to pull over and disconnect the truck.

Moral of the story, get a TPMS system if you don't have one. Stop arguing about "Mine Is Better Than Yours", It's kind of childless and will never solve anything. Again, if you don't have a system get one.

It seems like it is your way or no way.
Your excerpt:
If you think your valve monitor would have provided the same warning then show me the physics and if you are mathematician show me the surface integral of heat dispappation:
to me means I have to prove something to you. I don't. I know my system alerted me in time to save much more damage. What you feel about me, my education and knowledge of physics is just your way of puffing out your chest. So puff away. As I said, I don't have to prove/show anything to you. You are entitled to your opinion as I am in mine.To me, that is all that matters.
Our alarm went off as we were leaving the road to turn into a Verizon store. We did not have to be stopped for the high temperature to show up & the alarm to sound.
When I replied to you, I never said you were wrong. A courtesy extended to you but not returned. I said: This was not the case for us. You, one the other hand apparently believe everyone but you is wrong. Di

justme wrote:
I trust my in-tire sensor because it is mounted to the rim inside the tire and therefore will sense the change in temperature much faster than a valve stem sensor. It is the change in temperature vs time that IMHO is important. I suppose the valve sensor will eventually see the temperature change, but will it be show it in time for you to take action before permanent damage occurs to the axle? I saved my axle because I seen a small abnormal temperature rise of 5 degrees and I simply don't see how a valve stem temperature monitor would have detected that small increase in short period of time. After stopping to see what caused the temperature increase, I measured the hub with my IR gun and showed 180 deg while the temp monitor showed 135 vs a normal 130 the temperature monitor eventually went to 170 deg after stopping.
If you think your valve monitor would have provided the same warning then show me the physics and if you are mathematician show me the surface integral of heat dispappation ;-)

I trust my in-tire sensor because it is mounted to the rim inside the tire and therefore will sense the change in temperature much faster than a valve stem sensor. It is the change in temperature vs time that IMHO is important. I suppose the valve sensor will eventually see the temperature change, but will it be show it in time for you to take action before permanent damage occurs to the axle? I saved my axle because I seen a small abnormal temperature rise of 5 degrees and I simply don't see how a valve stem temperature monitor would have detected that small increase in short period of time. After stopping to see what caused the temperature increase, I measured the hub with my IR gun and showed 180 deg while the temp monitor showed 135 vs a normal 130 the temperature monitor eventually went to 170 deg after stopping.
If you think your valve monitor would have provided the same warning then show me the physics and if you are mathematician show me the surface integral of heat dispappation ;-)

I have the same system as RustyJC and the behavior of my system is pretty much as he explains.

The only thing I do not like with the flow through sensors is that they stick out beyond the tire rim. I can't get shorter valve stems so I bought 90 degree valve extenders and the sensors now are parallel with the face of the tire rim. They no longer stick out beyond the tire rim.

The behavior you're observing from your TST system seems strange to me. I have the TST 507 system with flow-through sensors and trailer repeater, and mine seems to respond very well. I'll generally see a cycle-to-cycle variation of perhaps 1 psig and/or 1 degF on a given tire once we're on the road and everything has stabilized under steady-state conditions.

You're right, though - if the TST system doesn't pick up a signal, it will display the last reading for quite awhile (probably to prevent "lost signal" nuisance alarms, which I've had when I forgot to plug in the repeater). I notice this when we unhitch from the 5th wheel and drive away without switching the trailer tire display off - the trailer tires will still be displaying the last readings obtained when I'm 5 miles away from the 5th wheel.

Rusty

justme wrote:
Temperature measurement is only accurate on inside mounted monitors. Temperature is important to monitor when brakes are too hot or bearing are running to hot and are near failure. I monitor the temp closely and a few degree above my normal range means something is going wrong and it is time to pull over an find out what. I burned a bearing, and saved my axle because of temperature monitoring. I doubt that an outside stem mounted sender would have allowed me save and axle when the bearing gave out.

The outside monitor measures temp just fine, that is how I know mine are not sending a signal because normally you can watch the temp rise as you are going down the road.

Think about it the tire is spinning around and the air constantly mixed. An inside sensor mounted to the center of the rim might be a little faster to temp changes but that would be it.

avvidclif1 wrote:
They are all limited to the same amount of transmitted power which limits range. Where do you have the display mounted? That can make a lot of difference. Mine is top center of the dash and I've never had a problem.

Have you contacted TST? They are very good to work with.

BTW the display will tell you when a battery is low, mine usually last 2 years. When the first one is low I change all 4 and carry spares in the RV.

Monitor is mounted below rear view mirror, repeater is mounted on 5th wheel pin box. Before I put on the repeater I had to mount the receiver to the back window to get any signal at all.