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8024638/AE00/V1-0/2019-09| SICK
S E R V I C E M A N U A L | MCS200HW
Subject to change without notice
MAINTENANCE
3
3.4.4
Replacing the non-return valve on the cell inlet filter
The non-return valve can be replaced with the cell fitted.
1
Disconnect the MCS200HW power supply.
2
Let the MCS200HW cool down.
3
Loosen the fastening screws of the cell cover on the right and left with a Phillips screw-
driver (4 pieces).
1
Open the cell cover (
see Chapter “Working on the cell”, page 14
2
Loosen the test gas connection with a jaw wrench (
see Fig. 15 “Cell inlet filter, hose con-
3
Remove the non-return valve and 90-degree bracket together.
.
Fig. 21: Non-return valve and 90-degree bracket, new
Fig. 22: Non-return valve, arrow marking, flow direction
4
Insulate the new non-return valve:
▸
Wrap both ends with Teflon tape.
▸
Leave the first two threads free.
Tools required
Jaw wrench, size 14
Spare parts set No.
Contents
2099679
Cell inlet filter and non-return valve
DANGER: Risk of burns due to hot surface.
Allow the MCS200HW to cool down before carrying out any work.
Do not remove the screws, only loosen them.
1 Non-return valve
2 Flow direction arrow marking
3 90-degree bracket
Observe winding direction:
Attach the Teflon tape so that it runs in the direction of rotation/threading when
screwing in.