Surtek MUL04 Manual De Usuario Y Garantía página 42

b. Set the rotary switch to 200 Ω. As prompted at the LCD connect terminal,
insert the red test lead into the Ω terminal and the black one into the COM
terminal.
c. Connect the black test lead probe of the meter to the ground terminal (i.e.
cold end) of the sensor.
WARNING
• If the sensor has a 1- or 3-lead outlet, the ground terminal is its shell.
• If the sensor has a 2- or 4-lead outlet, the ground terminal is its special wiring.
d. Connect the red test lead probe of the meter to the signal terminal (i.e. hot
end) of the sensor.
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 specifications in the operation
manual provided by the manufacturer.
The zirconia sensor is tested with the 2VDC. As prompted at the LCD connect
terminal, 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 200 kΩ. As prompted at the LCD connect
terminal, 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 ºF 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 temperatures.
2. Temperature sensor (see Fig. 15)
The temperature sensor changes the output resistance through the changes
in peripheral temperatures. The hotter the sensor is, the lower the resistance
becomes. The temperature sensor is generally used in engine braking, air
ventilation, flow, fuel temperature and other equipment.
Testing Procedure:
a. The same as in the resistance testing method.
b. When the general temperature of a heating sensor rises, its resistance will
drop. The thermal resistance of the temperature sensor of the automotive
engine is generally less than 300 Ω.
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Fig. 15