WABCO IVTM, System Description

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4
IVTM Components
16
4 Components
This component description details the properties of basic components.
Other details, such as dimensions, can be accessed via the WABCO online product
database NFORM at http://www.wabco-auto.com . To retrieve them, enter the de-
sired product number in the "Product number" input field.
4.1 Wheel module
CAUTION Risk due to incorrect handling
– Do not unscrew or remove the module from the bracket.
 Any changes of manipulation to the wheel module of any type, especially at-
tempts made to change the battery will destroy the device and may lead to
injuries.
fig. 4-1: Wheel module with connecting hose
The wheel module consists of a compound-filled plastic unit comprising a pressure
sensor, an evaluation circuit, a radio transmitter and a lithium battery.
Battery life under normal operating conditions is minimum 6.5 years. If the battery
is dead the module would not transmit any longer and needs to be replaced with a
new one.
The wheel module is mounted to the rim by the standard lug nuts and is connected
to valve via a PA tube. The result is an easy installation. You will not need to re-
move the tire from the rim when retrofitting.
Data transfer
Wireless transmission is made by 433 MHz signal. If pressure is constant, meas-
ured values are transmitted every 18 minutes (9 minutes with versions that do not
have acceleration sensor), if pressure is changing, frequency of data transfers is
faster.
IVTM can be interrupted in its function if other devices or systems in the vicinity are
also transmitting in the area of 433 MHz. These can be radio sets, radio remote
controls (e.g. for door actuation, cranes, fork lift), insufficiently shielded electrical
drives with high power or other radio transmitters. When IVTM system is removed
from the influencing area, the function is guaranteed again.