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E xplosion protection - device description
T he E xSafeT el MB serves for making calls within operating facilities in
danger of explosion in the zones : Zone 1 , Zone 2, Zone 21 and Zone
22.
T he telephone is to be realized in the following ignition protection types:
II 2G E x e mb [ib] IIC T 5 Gb
E x e mb [ib] IIC T 5 Gb
II 2D E x tb [ib] IlIC T 100 °C Db
E x tb [ib] IlIC T 100 °C Db
-25°C T
a
60°C
-25°C T
a
60°C
II 2G E x e mb [ib] IIC T 6 Gb
E x e mb [ib] IIC T 6 Gb
II 2D E x tb [ib] IlIC T 80°C Db
E x tb [ib] IlIC T 80°C Db
-25°C T
a
40°C
-25°C T
a
40°C
DMT 03 ATEX E 034
T he E xSafeTel MB telephone is designated to analogue telephone
networks.
T he non-secure voltage of the telephone network is led into increased
security on the clamps 13 and 14 (A, B). In the call state, this voltage is
switched through to the clamps 15 and 16 (Bell shunt1 , Bell shunt) with
increased security. T he clamps 15 and 16 (Bell shunt1 , Bell shunt) are
designated for the connection of passive loads, e.g. a passive external,
explosion protected second alarm.
Furthermore, from the non-secure voltage of the analogue telephone
network:
a secure listener current with clamps within the telephone casing,
for the receiver connected with the telephone casing, as well as
secure circuits with clamps within the telephone casing to connect a
secure headset or optionally a secure second receiver, as well as
a secure circuit with clamps within the telephone casing for the
connection to a secure speaker.
T he headset, second receiver, external speaker and external secondary
alarm accessories are not a component of the ExSafeTel MB
telephone, but rather can be connected as an option.
