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Figure 5 LEMO-10 plug
The numbers on these sockets correspond to the pin numbers on a LEMO-10 sensor plug as
illustrated in
Figure
5.
The cleaning and regeneration center does not need to be plugged into the power for these tests.
The LEMO plug of the sensor being tested must be plugged into the socket in the center of the unit
(No. 6 in
Figure 1
on page 6).
5.2.1 Check temperature measurement thermistors
Checking the values against those given in
the resistance between:
A discrepancy greater than ±10% indicates a probable fault in the circuit.
5.2.2 Check temperature compensation thermistors
Checking the values against those given in
the resistance between:
A discrepancy greater than ±10% indicates a probable fault in the circuit.
5.2.3 Check connections within the sensor
Measure the resistance between all pins and the shield. Check that no short circuits exist in the
sensor by measuring between the following pins:
Pin 3 and Pin 4
Pin 3 and Pin 9
Pin 3 and Pin 1
Pin 1 and Pin 4
Pin 1 and Pin 9
To check for continuity between each of the electrodes and the corresponding pin on the LEMO plug
it is necessary to empty the electrolyte reservoir then rinse it out and thoroughly dry it. In particular, it
is essential that the gap between the cathode (anode for hydrogen sensors) and the guard ring
electrode be absolutely dry.
Resistance tables
Pin 3 and Pin 10
Resistance tables
Pin 3 and Pin 10
Pin 7 and Pin 8 (Ozone sensor model 31331 only)
Pin 2 and Pin 5 (Ozone sensor model 31331 only)
Resistance should be infinite
A finite resistance can exist in these cases, but it must not be zero
on page 12, if applicable, measure
All sensors
Pin 3 and Pin 6
on page 12, if applicable, measure
Sensor
Pin 3 and Pin 6
Pin 1 and Pin 8
English 11
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