MEDC Ex ResistTel MB - Manual (Page 12)

12
Secure connection clamps:
From the casting, a 12-pin, secure connection clamp series (see
connection plan on page 18) comes out to connect the receiver
integrated in the telephone casing, clamps 1 to 4, as well as the secure
accessories, clamps 5 to 12.
The clamps 7 and 8 are intended for the connection of dynamic
earphones, as used in second receiver and headsets. This output is
therefore optionally used to connect a second receive or a headset, this
means second receivers and headsets cannot be connected
simultaneously as accessories.
Clamp Note Usage
1 Dynamic earphone connection 1
Earphone ear piece
2 Dynamic earphone connection 2
3 Electret microphone connection (+)
Earpiece microphone
4 Electret microphone connection (-)
5 Electret microphone connection (+)
Headset microphone
6 Electret microphone connection (-)
7 Dynamic earphone connection 1 Headset or second
receiver earphone 8 Dynamic earphone connection 2
9
Bridges between the clamps 9 and
10 recognize the telephone as a
connected headset
Headset recognition
10
11
Dynamic volume connection 1
External speaker
12
Dynamic speaker connection 2
To connect the accessory, the blank plugs installed in the telephone
casing are to be exchanged through suitable explosion protected cable
and line guides (M20x1.5).
Before the connection of the secure accessories, an evaluation of the
security should be executed by the raiser corresponding with the PTB
report "interconnection of non-linear and linear security circuits", PTB-
ThEx-10, November 1999 (ISBN 3-89701-440-8), provided no system
certificate is provided for the designated interconnection.
The technical data for the evaluation of the security should be taken
from the section "explosion protection parameters".
Further information see EN60079-14 "electrical operating equipment for
gas explosion endangered areas" as well as EN50281-1-1 "electrical
operating equipment for usage in areas with flammable dust". When
operating the device in explosion dangerous areas with flammable dust,
the operator must observe EN50281-1-2 (IEC61241-1-2).