MDM300 I.S. Sensor & Battery Replacement Manual
Michell Instruments
3
MAINTENANCE
1.2.3 Internal Sensor Removal and Replacement
Sensor removal
To remove the sensor proceed as follows:
1. Open the instrument case as described in Section 1.2.1.
2. Remove the connectors, (3), (4) and (5) from the back of the sensor
(see
Figure 3).
NOTE: Each connector is locked in position
by a clamp situated at the back of the connector. Before
attempting to pull the connector out, push this clamp away
from the connector in order to release it.
3. Use a spanner to unscrew the locknuts (1) securing the sensor to the
gas inlet and outlet ports.
4. Lift the sensor (2) clear.
2
3
5
4
1
Figure 3
Internal Sensor Removal
Sensor replacement
To replace the sensor, proceed as follows:
1. Place the replacement sensor back into the gas connections,
ensuring
that it is re-installed in the same orientation as previously
,
and locate the olives in the gas ports.
2. Tighten each of the locknuts (1) finger tight.
3. Tighten each union an additional ¾ of a turn.
4. Re-fit the connectors (3), (4) and (5). The connectors are polarized
and cannot be inserted incorrectly. Ensure that the connectors lock
into position.
5. Close the casing as described in Section 1.2.2.
6. Switch on the instrument and check that it is operating satisfactorily.
