Critical Environment Technologies GEM-II, Руководство по эксплуатации

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22 © 2014 All rights reserved. Data subject to change without notice.
GEM-II - Operation Manual Rev. E | 2014.10
6 InsTallaTIon
6.1 aC and DC Wiring
The GEM is a low voltage powered gas detector. All wiring should be run within properly
grounded (earth or safety) conduit. Signal output and supply should be in shielded cable.
The remote sensor wiring should be done with four conductor shielded 18 awg stranded wire in
a separate conduit from all other wiring.
THREE WIRE CONNECTION
If providing VDC or VAC Ground Referenced use terminals 12 & 13. This is now a Half Wave device
in this configuration Please observe polarity. The Ground referenced AC must be connected to
terminal 12. J2 open. Factory default.
FOUR WIRE CONNECTION
If providing VAC power, using terminals 13 & 14. This is now a Full Wave device in this
configuration, and requires a isolated supply (separate 24 VAC transformer with NO Ground
connections) and J2 be shorted.
See drawings below – if uncertain contact CETCI service for assistance.
IMPORTANT: WIRING EXAMPLES: NON GROUNDED REFERENCE SUPPLIES ONLY
6.1.1 Wiring Example 1
Wiring Example 1
24 VAC
GND
SIGNAL
GND
120 VAC
Controller
GEM-II
24 VAC
120 VAC
24 VAC
Isolated
No Ground Reference