DANGER
Risk of explosion through incorrect settings for the pressurized enclosure
The pressurized enclosure is a central safety part of the device. All work is described in
this Manual and the relevant specified documents. If work is performed which is not
described in this Manual, the risk of explosion of the measuring system increases and
the ATEX certification for the device becomes void.
b
Carry out all work skillfully and in accordance with the delivered documentation.
Checking the protective gas feed
NOTE
Keep the device in operation during the check.
1
Interrupt protective gas feed to the device.
The Ex control unit should signal an error state after a few minutes.
2
Start protective gas feed again.
The Ex control unit should now reset the error state and start the pre-purge phase.
9.4.1
Maintenance work on the FS840
Maintenance FS840
b
Inspect the inlet and outlet of the FS840 regularly for contamination / corrosion.
b
Correct cleaning in good time by Gönnheimer Elektronic GmbH as a precautionary
measure against failure of a control unit.
9.4.2
Repair work on the FS840
NOTE
Repairs on the FS840 as well as accessories may only be carried out by Gönnheimer
Elektronic GmbH.
9.5
Removing the sender/receiver unit
DANGER
Hazard for health through contact with inert protective gas
Inert protective gas can emerge uncontrolled when the device is opened directly after
switching off. Direct contact with inert protective gas is a high health risk, including risk
of suffocation.
b
Interrupt the inert gas feed before opening the device so that only the volume of
inert gas in the device can escape.
b
Ensure good ventilation and air exchange.
b
Never open the device when the room is too small.
MAINTENANCE
9
8019532/100Q/V1-1/2018-08 | SICK
O P E R A T I N G I N S T R U C T I O N S | GM700 Ex
71
Subject to change without notice