Medc Ex ResistTel User Manual download pdf (Page 10)

Explosion protection – device description

Regarding the explosion protection the ExResistTel telephone and the

ExResistTel telephone in ZB version are identical.

The explosion protection enables the user to make and receive calls

within hazardous areas of zone 1, in presence of an explosive gas or

dust atmosphere.

The ExResistTel telephone is manufactured in the following protection

classes:

II 2 G Ex emb [ib] IIC T5 Ex emb [ib] IIC T5

II 2 D Ex tD A21 IP66 T100°C Ex tD A21 IP66 T100°C

-25°C ≤ T

≤ +60°C -25°C ≤ T

≤ +60°C

Ex emb [ib] IIC T6

II 2 G Ex emb [ib] IIC T6 Ex tD A21 IP66 T80°C

II 2 D Ex tD A21 IP66 T80°C -25°C ≤ T

≤ +40°C

-25°C ≤ T

≤ +40°C IECEx BVS 11.0033

The ExResistTel telephone is designed for connection with analogue

telephone networks.

The non-intrinsically safe voltage of the telephone network is connected

to the terminals 13 and 14 (A, B) in increased safety. In calling/ringing

mode, this voltage is switched to the terminals 15 and 16 (Bell shunt1,

Bell shunt) in increased safety. The terminals 15 and 16 (Bell shunt1,

Bell shunt) are intended for passive consumers, e.g. a passive external,

explosion-proof secondary ringer.

Furthermore, a non-intrinsically safe voltage from the analogue

telephone network is turned into:

• an intrinsically safe receiver circuit with terminals on the inside of

the telephone housing, for use with the receiver, which is

permanently connected to the telephone housing, and

• intrinsically safe circuits with terminals within the telephone housing

for connecting an intrinsically safe headset or, optionally, an

intrinsically safe second earpiece, and

• an intrinsically safe circuit with terminals within the telephone

housing for the connection of an intrinsically safe loudspeaker.

The accessories headset, second earpiece, external loudspeaker and

external secondary ringer are not parts of the ExResistTel telephone,

but optional extras.

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Medc Ex ResistTel User Manual Page 10