11
Secure connection clamps:
From the casting, a secure connection clamp series (see connection
diagram on page 16) comes out to connect the receiver integrated in the
telephone casing, clamps 1 to 4, as well as the secure accessories,
clamps 5 to 10.
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
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 connecting intrinsically safe accessories, and if a system
certificate for the intended connection does not exist, the constructor
should perform an evaluation of the intrinsic safety according to
EN 60079-25.
The technical data for the evaluation of the intrinsic safety can be found
in the chapter “Characteristic data”.
Further information see EN 60079-14.
A metal bracket is supplied for hanging up the intrinsically safe second
earpiece or headset. The metal bracket should be attached to the
telephone by means of the two threaded bushes in the floor of the
telephone housing. The corresponding bores in the metal bracket can
be used to screw the bracket securely onto to the housing floor (see
overview of the device on page 6). Thus, if the constructor wants to use
