Service Procedures; Exhaust Silencer Replacement; Oxygen Cell Replacement; Dust Filter Element Change - Parker MIDIGAS 2 Guia Del Usuario

5.4 Service Procedures

5.4.1 Exhaust Silencer Replacement

A The exhaust silencer is located under the inlet manifold assembly.
Unscrew the element from the exhaust port and discard.
Fit the replacement element ensuring that it is fully engaged onto the pipe fitting and secure it hand tight.

5.4.2 Oxygen Cell Replacement

B Disconnect the oxygen cell lead from terminals 1, 2 and 3 (% vol. O
Unscrew the tube nut (3) holding the O
Fit the replacement sensor onto the t-piece and secure the tube nut. Perform a leak test and repair as required.
Refit the electrical connections to the O
Terminal Colour
1 Black
2 Red
3 Green
4 Black
5 Red
Calibrate the sensor as detailed.
Note: PPM cells require the offset value to be entered prior to calibrating).

5.4.3 Dust Filter Element Change

C Close the ball valves located on the inlet and outlet ports of the filter and de-pressurise it by opening the drain valve (5) on the filter bowl (6).
D Once de-pressurised unscrew the bowl from the filter head (7) and remove the old filter element (8).
E Holding the replacement element by the end caps (9) fit it into the bowl ensuring that the element is correctly seated in the grooves provided
(10).
F Assemble the filter bowl back onto the filter head and tighten. The markers on the filter head and filter bowl must line up with each other
when fully assembled (11).
Close the drain valve on the filter and slowly open the filter outlet valve and inlet valve.
20
cell (4) in place and remove the cell.
2
analyser as detailed below.
2
Function
-ve % vol. sensor
+ve % vol. sensor
Ground
-ve ppm vol. sensor
+ve ppm vol. sensor
cells) or 3, 4 and 5 (ppm vol. O
2
cells) of the O analyser (2).
2 2