User Manual for the Type 8370
WSM 6+ Transponder
UM-8370
Issue A Rev 1
Section 3 – Technical Description
12
3.9.5 Pressure Relief Vent Valve
A Pressure Relief Vent Valve is provided to make sure there is no build-up of gas inside the
transponder caused by the charging process. The battery manufacturer recommends the batteries
are charged in an open environment. However, they also specify that no gas is vented by the
batteries, providing the recommended charging procedures are followed. The WSM 6+ includes
special circuitry to monitor the battery pack during charging. This safety feature makes sure the
battery cannot be overcharged in normal use. For this reason it is not deemed necessary to remove
the Pressure Relief Vent Valve during charging of a fully operational transponder.
Should there be any reason to suspect that there is pressure inside the unit, or that the charging
circuitry may be faulty, it is recommended the Pressure Relief Vent Valve is extracted prior to
charging (refer to
Section 4.2.1 “Checking the Pressure Relief Vent Valve”
) .
