8
Operation
8.1
Safety
WARNING
Hazard for persons and plant through unsafe operation of the measuring system
If the device is or could be in an unsafe state:
b
Put the device out of operation.
b
Disconnect the device from the main supply voltage and signal voltage.
b
Secure the device against unallowed or unintentional start-up.
NOTE
More information concerning the detection of unsafe operating states, see Chapter
“Visual check”.
8.1.1
Check before commissioning
Before every start-up
b
Check all enclosures are closed:
–
Enclosure cover
–
Cable inlets
–
Enclosure openings
NOTICE
Permanent feed of protective gas must be ensured,
.
8.2
Operating and display elements (evaluation unit)
DANGER
Risk of explosion through releasing the Ex protection
The operating elements of the evaluation unit GMA700 can only be used when the eval‐
uation unit is opened. The zone separation is no longer ensured when the evaluation
unit is opened in the Ex zone during operation. This creates an explosion risk.
The Ex-p system generates a warning signal that the Ex protection is not effective.
To operate the measuring system via the operating elements:
b
Ensure an Ex-free atmosphere exists when opening the GMA700.
8
OPERATION
58
O P E R A T I N G I N S T R U C T I O N S | GM700 Ex
8019532/100Q/V1-1/2018-08 | SICK
Subject to change without notice