Haltech Wideband 02 Controller Manual - Manual (Page 7)

Do NOT install the Bung below the 3 o'clock or 9 o'clock position.
Condensation can form in the exhaust pipe and permanently damage the sensor.
6 o’clock is the absolute worst position to mount the sensor.
Wide band oxygen sensors – like the one shipped optionally with the HWC
– are designed to work with unleaded gasoline. Using them with leaded gasoline
will significantly reduce the lifespan of the sensor. The reduction is directly
proportional to the metal content of the fuel. In most cases, a wide band sensor
will provide accurate measurements somewhere between 50 hours and 500 hours
with leaded fuel.
WHEN INSTALLED IN THE EXHAUST, THE OXYGEN SENSOR
MUST BE CONNECTED AND OPERATING WITH THE HWC
WHENEVER THE CAR IS RUNNING. AN UN-POWERED OXYGEN
SENSOR WILL BE DAMAGED WHEN EXPOSED TO EXHAUST GAS.
The maximum temperature of the sensor at the bung (the sensor hexagon)
should not exceed 500 o C or 900 o F. If these temperatures are exceeded in your
application you should either install a copper heat sink (see instructions below).
It is NOT a good idea to connect the HWC permanently to 12V and switch it
on with a separate switch before the vehicle is started. Depending on the climate
and the sensor position in the exhaust, condensation water can form in the
exhaust pipes. This condensation water could then be blown by the exhaust
stream against the hot sensor when the car is started. The resulting heat shock
can permanently damage the sensor.
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