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to replace the Controller
a To remove the controller from the panel, turn screw in the bottom right hand corner of the controller
fascia counter clockwise. The instrument will start to withdraw from the sleeve and once the screw
has been turned to its furthest extent the instrument can be withdrawn by hand.
b To replace the controller: ease the instrument by hand into the sleeve to its furthest extent. About
10mm will be left protruding. With a screwdriver, turn the screw in the bottom right hand corner
clockwise until it is tight. The instrument will be pulled completely into the sleeve, engaging the rear
terminals and be fully secured.
c Should it be necessary to remove the sleeve, first remove the controller as above, and then gain
access to the rear of the front panel as 2a and b. Remove wiring from the rear of the sleeve, loosen
the two retaining screws until it is possible to lift the screws outwards and push the mounting
clamps into the sleeve. Replacement of the sleeve is in the reverse order.
to replace the air filters
a Access to the compressed air filters can be gained through the front panel as above or through the
bottom of the unit. To replace the particle filter element (60) or the oil filter element (62) turn off
the air supply. Unscrew the transparent filter bowl, then unscrew the filter element. Note when
replacing the oil filter element the small O ring between the element and the housing should also
be changed. Filter bowls should only by cleaned with soapy water DO NOT USE SOLVENTS.
b When refitting filter bowls, ensure that the rubber seal is in place.
NOTE: REGULATORS ARE FACTORY SET AND SHOULD NOT BE ADJUSTED.
to replace the porous plate
It should be noted that replacement of the porous plate is rarely necessary; however, should the plate
become blocked or damaged the following instructions should be followed.
a) Empty the unit of alumina as in 1 above.
b) Remove the jar (13) and turn the unit on its back.
c) Disconnect the air line to the air supply point on the inside of the chassis (6) by unscrewing the
knurled nut and pulling the plastic pipe clear.
d) Remove eight nut and lock washers holding the chassis (6) to the LH wrapper (2), RH wrapper
(3) and central wrapper (55), one bolt and lock washer situated in the recess for the dust
extraction jar (13), and two lock nuts on the stud of the plenum chamber (42). Pull chassis
clear.
e) Remove 25 nuts, bolts and washers securing plenum chamber (42) to the inner container (41).
Pull the plenum chamber clear and remove the porous plate (43).
f) Clean any sealant from the flanges of the plenum chamber and inner container. A seal of Red
Hermetite should be placed on both of the above flanges when fitting a new porous plate. Fit
the porous plate while the seal is still wet, ensure that the porous plate and plenum chamber
are correctly aligned with the offset hole in the inner container assembly.
g) Refit the 25 nuts, bolts and washers and tighten them to a torque of 2.25-2.7 Nm (20-24 lb ins).
h) Reverse the operation for replacing the chassis.
