Expiry Of Explosion Protection Operating Permit (Ex Certificate); Use Of Headset In Potentially Explosive Atmospheres; Service Adapter Socket - Funkwerk FC4 Manuel D'utilisation

Ex – Safety information
the hazardous area. Unintended switching on and setting into operation again
must absolutely be avoided.

Expiry of explosion protection operating permit (Ex certificate)

Any modification of the unit or of unit parts that has not been approved by the
manufacturer will invalidate the operating permit for this unit. In that case, the
unit must not be introduced into hazardous areas with potentially explosive at-
mospheres or used there.

Use of headset in potentially explosive atmospheres

FC4 Ex, FC4 L Ex
The use of headphones/headset with an explosion-proof unit version
FC4 (L) Ex is not allowed! To maintain the explosion protection, the
sealing plug is permanently glued into the socket. When this plug is remo-
ved, the operating permit for the explosion-proof unit expires.
FC4 Ex HS, FC4 L Ex HS
The explosion-proof handsets with the designation FC4 (L) Ex HS may be
operated either with the headphones/headset, part no. 50 1010 5101 or
with headphones / headsets having their own explosion protection approval
and additionally matching the requirements specified on page 153. The ex-
plosion protection of these FC4 (L) Ex HS handsets is limited to gas explo-
sion protection. When these handsets are operated without headphones /
headset, the socket must be plugged with the original plug. Otherwise the
operating permit for the explosion-proof unit will expire.

Service adapter socket

On the rear of the explosion-proof unit, a service adapter socket is provided
which in the ex-works condition is plugged with a rubber plug. The explosion-
proof unit may only be brought into hazardous areas with potentially explosive
atmospheres and operated there when the service adapter socket is plugged
with the undamaged original plug.
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FC4‚ FC4 L, FC4 Ex (HS), FC4 L Ex (HS)