Dräger 83 17 990 Instrucciones De Montaje página 16

Installing electrical connections
3.1.6 Installing the transmitter in explosion-hazard areas of
zone 2
Use only supply units or a safety barrier of the device category 3.
Take care that the maximum permissible capacitance and inductance
of connections to the safety barrier are not exceeded, also taking the
cable into account The safety-related input parameters of the
transmitter are:
Polytron 3000: Ci = 0 nF, Li = 50 μH

Polytron 7000: Ci = 5 nF, Li = 50 μH

CAUTION
!
The category 1 marking has to be cut out from the rating-plate
label. Once the unit has been used after installation in the
above manner, it may never be installed in underground
mines susceptible to firedamp or explosion-hazard areas of
zone 0 or zone 1 (device category 1 or 2). Explosion hazard!
16
Explosion-Hazard area, zone 2
Ex i
Safety barrier
PA
Earth point
Non-explosion-hazard area
Dräger Docking Station for Polytron 3000/7000
+24 V
4 to 20 mA
+
4 ... 20 mA
+
–
0 V
Control Unit
00523760_4_en.eps