Wheel Transmitter Modules

Wheel Transmitter Modules

The transmitter modules are located inside the tire attached to the valve stem. The modules contain a pressure and temperature sensor, a long life 3.6V lithium battery and a radio transmitter.

- Operating frequency for the U.S.:315Mhz
- Battery life:5 to 7 years

The transmitter modules are active in an energy saving mode even when they are sitting as spare parts on the shelf.

Each transmitter module has it's own unique I.D. code. The I.D. code is assigned to a position on the vehicle (Right rear, left front etc..) after a successful initialization has been completed.

The radio signal transmitted by the wheel modules is received when the tire passes close to the antenna. The valve stem of the spare tire should be pointed towards the right rear wheel house because the spare is also included in the monitoring (although it is not displayed on the CD).

The wheel transmitter module measures its ambient air pressure every minute. If the air pressure increases by 0.5 bar between measurements , the transmission rate increases to every 0.8 seconds.

If the increase in air pressure is detected for approximately 216 seconds, the full functionality of the wheel module is activated. If the higher pressure then continues, the module remains permanently active and measures the air pressure and temperature every 0.3 seconds and transmits the information by radio signal every 55 seconds.

At temperatures over 120°C the transmitter modules are switched off. Once he transmitter cools to below 110°C operation resumes.