SICK DUSTHUNTER SP100 Ex-3K, Operating Instructions Manual

Page: 107 / 140

107 8020216/19YN/V3-0/2020-12| SICK O P E R A T I N G I N S T R U C T I O N S | DUSTHUNTER SP100 Ex-3K
Subject to change without notice
MAINTENANCE
12
12.6.10 Replacing the non-return valve
Replacement criterion: In case of damage.
Ex-condition: Replacement can be carried out in the Ex-area when the absence
of an explosive atmosphere has been verified with a gas warning
device.
Note Depending on the design conditions on site, the seals can be
replaced without removing the sender/receiver unit from the duct.
In this case, work steps 2, 3, 4, 10 and 11 are not necessary.
Work steps:
1
Disconnect the entire device (control unit and sender/receiver unit) from the power
supply.
2
Disconnect the potential equalization line, if necessary.
3
Loosen the flange screws and remove the sender/receiver unit from the duct and allow it
to cool down, if necessary.
4
Place the enclosure rear side of the sender/receiver unit on a flat surface.
5
Switch off the purge gas supply.
6
Detach the purge air hose from the non-return valve.
7
Unscrew the non-return valve (SW 22) while holding the reduction piece with a wrench
(SW 24).
8
Screw in the non-return valve ( see Fig. 58

) with new seal ( see Fig. 58

) and tighten
with 20 Nm.
9
Fit the purge gas hose and switch on the purge gas supply.
10
Fit the sender/receiver unit on the duct flange (torque 20 Nm).
11
Connect the potential equalization line.
12
Put the complete device back into operation (switch on voltage and check measured and
status values).