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the plate.
H. Replacement of reference sensor
To replace the reference sensor in the well unit, follow steps
A through D and then follow the procedure given below:
For CTC-140 A, MTC-140 A:
1. Turn the well upside down so that Connection PCB is
facing upwards.
2. Loosen the two wires in the 4-poled connector.
3. Loosen the two wires in the 2-poled connector placed
next to the 4-poled connector.
4. Remove the two screws securing the PCB to the
insulation and tip the PCB aside gently.
5. Remove the old reference sensor and replace it with the
new spare part 105287.
6. Reassemble the unit carefully in reverse order.
For CTC-320 A, MTC-320 A:
1. Turn the well upside down to expose the bottom of the
unit.
2. Use a wire cutter to cut the straps holding the wires
together.
3. Remove the screw and clamp holding the reference
sensor in position.
4. Pull out the old reference sensor and replace it with the
new spare part 105288.
5. Before mounting the new sensor, make a 90° bend
between the two ceramic tubes.
6. Mount the new reference sensor in the same position as
the old sensor.
7. Ensure that the two wires in the bend between the
ceramic tubes do not short-circuit.
8. Replace the clamp and the screw as before.
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