Do external sensors corrode?

TyrePal sensors are usually very resistant to corrosion, but we do advise taking some precautions to reduce the risk. Where corrosion occurs Corrosion occurs mostly where different metals are in contact in the presence of an electrolyte like salty water. TyrePal sensors have a brass thread, and this presents very little risk of corrosion when fitted to normal brass tyre valves. Some specialised tyre valve stems are made of aluminium. We do not recommend using TyrePal external sensors with this type of valve as corrosion will occur where the different metals are in contact. Sensor locking rings are made of … Continue reading

Connecting and disconnecting a trailer

With TC215 system The TC215 monitor has a ‘LINK’ button that allows you to start or stop monitoring the trailer tyres. When unlinked, the trailer tyres are not shown on the monitor. With TA22 system If you have sensors on both a towing vehicle and a towed trailer such as a caravan or a towed car, when you no longer have the trailer attached the system will recognise this and will show “noS” (no signal) on the display. This can take some time before this appears and during this period the pressures shown for the trailer are those which were … Continue reading

Signal transmission question

TyrePal systems communicate at 433MHz, and comply with strict international requirements about causing and accepting radio interference. All devices using radio frequency signals are subject to loss of signal from time to time and this may be more marked in certain areas, especially around military or communications installations. TyrePal systems are optimised to overcome interference as far as possible or to minimise its impact, while providing acceptable battery life. A TyrePal sensor measures the pressure and temperature of the tyre every few seconds, while it is in motion, but unless the pressure is actually falling, a signal is transmitted to … Continue reading

Tyre pressure effects driving performance

It’s widely known that tyre pressure effects driving performance. When tyres are underinflated, a car is more difficult to steer and slower to respond. There’s less feeling of connection with the road, and the reactions of rear tyres seem to lag behind the front tyres. At TyrePal, we are interested in the impact of tyre pressure on performance, so we decided to look for some specific data from tests on real cars Track testing Tests were carried out on two 2003 BMW 330Ci coupes: one with recommended pressures of 29psi front and 33 psi rear, the other with 20psi front … Continue reading

Impact of tyre pressure on dual wheels

Mismatched tyre pressures are a real problem for dual wheels. The mismatch results in a change in diameter that makes the larger wheel drag the smaller one and the smaller wheel hold the larger one back. A difference of just 5 psi can change the diameter by as much as 8mm, resulting in the smaller tyre being dragged 1Km for every 130Km travelled. This leads to rapid and irregular wear for both tyres of the pair, as well as increased fuel consumption in overcoming the resistance. Bigger pressure differences put additional load on the larger wheel, increasing the wear rate … Continue reading

International standard for TPMS

The international standard for tyre pressuer monitoring systems is ISO21750. The standard was written to cover direct and indirect systems, and TyrePal systems can operate as a tyre pressure warning system well within the requirements as defined in this International Standard. ISO standard requirements To comply with the standard, a system should give an alert for a low pressure condition 10kPa (1.4psi) below a threshold within 3 minutes driving at more than 25km/h. The threshold may be set by the user. In the event of a leak, a pressure loss between 10kPa/min and 20kPa/min (1.5 to 3psi/min) should produce an … Continue reading

What alarm levels should I set?

Installed the sensors on my Renault Espace this afternoon and went for a 3 mile trip. I set the low tyre pressure a couple of psi below the Renault quoted cold normal figure and the upper a couple of psi above the quoted cold normal figure. As expected the max pressure was exceeded and the alarm went off when the tyres became warm after just 3 miles on a cold day with ambient temp about freezing. Can you advise what I should set the upper warning limit to bearing in mind the ambient temperature throughout the year will vary widely … Continue reading