User Manual
71
UT108/109 OPERATING MANUAL
UT108/109 OPERATING MANUAL
72
If the sensor has more than 3 leads, what is used in the automobile is a heat oxygen
sensor, which has 2 hot ends. Refer the positions of the hot ends in various kinds of
automotive manuals. At this time, connect the red and black test lead probes respectively
to these two hot ends. Compare the readings with the specications in the operation
manual provided by the manufacturer.
The ZIRCONIA sensor is tested with the DCV. Insert the red test lead into the V terminal
and insert the black test lead into the COM terminal.
The TITANIA sensor is tested with the Ω. Insert the red test lead into the Ω terminal and
insert the black test lead into the COM terminal.
Secure the sensor with a table vice, light up the propane burner and add a heat sensor
terminal. Make its temperature about 660 ℉ and exhaust the oxygen from the sensor,
when the readings can be obtained:
The ZIRCONIA sensor has a voltage of 0.6 V or more.
The TITANIA sensor has a resistance of about 1 Ω.
Move the burner away for heating, when the reading can be obtained:
The ZIRCONIA sensor has a voltage of 0.4 V or more.
The TITANIA sensor has a resistance of about 4 kΩ.
Warning:
In testing, the readings will vary with the heating temperature.