Samson 4763, Mounting And Operating Instruction

Page: 9 / 78

EB 8359-2 EN 1-5
Safety instructions and measures
1.4 Special instructions concerning explosion protection
Equipment for use in zone 2/zone 22
Î
In equipment operated according to type of protection Ex nA II (non-sparking equip -
ment) according to EN 60079-15: 2003, circuits may be connected, interrupted or
switched while energized only during installation, maintenance or repair.
Î
Guide wires for the set point through the cable gland to the terminals 11 (+) and 12
(–) located on the housing.
Î
Connect the ground connection inside or outside of the housing.
Servicing explosion-protected devices
Î
Observe the following for servicing equipment in a section relevant for explosion pro-
tection:
– The equipment must not be put back into operation until a qualified inspector has
assessed the equipment according to explosion protection requirements, has is-
sued an inspection certificate or given the device a mark of conformity. Inspection
by a qualified inspector is not required if the manufacturer performed a routine
test on the device before putting it back into operation. Document the passing of
the routine test by attaching a mark of conformity to the device.
– Replace explosion-protected components only with original, routine-tested compo-
nents by the manufacturer.
– Devices that have already been operated outside hazardous areas and are in -
tended for future use inside hazardous areas must comply with the safety require -
ments placed on serviced devices. Before being operated inside hazardous areas,
test the devices according to the specifications for servicing explosion-protected
devices.
Maintenance, calibration and work on equipment
Î
Only use intrinsically safe current/voltage calibrators and measuring instruments for
interconnection with intrinsically safe circuits to check or calibrate the equipment in-
side or outside hazardous areas.
Î
Observe the maximum permissible values specified in the certificates for intrinsically
safe circuits.