6
6.1.3. Reassembly – Sensor Assembly
i.
Place the o-ring (25) into the sensor (14) and position to the lower face below
the thread.
ii.
Then, place the vent seat (13) into the sensor (14) with the o-ring groove facing
downwards.
iii.
Place the respective o-ring (23, 24) and back up (1, 3) over the sensor holder (15)
and sensor (14).
NOTE: Back up (1) may need to be cut.
iv.
Ensuring that the o-ring (24) around the sensor (14) is well lubricated, push the
sensor (14) into the sensor holder (15).
NOTE: The outer diameter of the sensor should locate into the lower bore of the
sensor holder.
v.
Screw the spring rest (11) into the sensor (14).
vi.
The assembly can be secured by gripping the flats of the spring rest (11) in a vice
and using a slotted screwdriver to tighten the sensor (14). Alternatively, a steel
rule (or equivalent may be secured in a vice and used to accommodate the slot in
the sensor whilst the spring rest is tightened using a 17mm open ended spanner
or adjustable.
IMPORTANT: Do not over compress the vent seat when tightening. A visible gap of ~1mm
should be left between the sensor and spring rest. Half a turn past the point at which the
spring rest comes into contact with the vent seat should be sufficient. It is also
recommended to use Loctite to prevent the spring rest from working loose in operation.
