MEDC Ex ResistTel MB - Manual (Page 10)

10
Explosion protection - device description
The ExResistTel MB serves for making calls within operating facilities in
danger of explosion in the zones: Zone 1, Zone 2, Zone 21 and Zone
22.
The telephone is to be realized in the following ignition protection types:
II 2G Ex e mb [ib] IIC T5 Gb
Ex e mb [ib] IIC T5 Gb
II 2D Ex tb [ib] IlIC T100°C Db Ex tb [ib] IlIC T100°C Db
-25°C
≤ T
a
≤ 60°C
-25°C
≤ T
a
≤ 60°C
II 2G Ex e mb [ib] IIC T6 Gb Ex e mb [ib] IIC T6 Gb
II 2D Ex tb [ib] IlIC T80°C Db Ex tb [ib] IlIC T80°C Db
-25°C
≤ T
a
≤ 40°C
-25°C
≤ T
a
≤ 40°C
DMT 02 ATEX E 183 IECEx BVS 11.0033
The ExResistTel MB telephone is designated to analogue telephone
networks.
The 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. The 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.
The headset, second receiver, external speaker and external secondary
alarm accessories are not a component of the ExResistTel MB
telephone, but rather can be connected as an option.