System 57 Quick Start Guide
05701-M-5026 MAN0839 Issue 1
8.5 5704 Gas Card and Catalytic Type Detector
Catalytic detectors require a three wire connection and the detector documentation will
indicate three connections S, 01 and NS, which are usually brown, white and blue
respectively. At the System 57 end of the field cable, the three detector wires should each be
connected to the respective matching S, 01 or NS terminal of the appropriate channel on the
Quad Relay Interface Card that is attached to the required Four Channel Control Card.
NS
S
01
19
17
15
Detector
NS
S
01
5704 Quad Card
The diagram shows the detector connections for Channel 1. Channel 2, 3 and 4 connections
are similar and their terminal connection numbers are shown in section 7.
8.6 5704 Gas Card and 2 Wire Loop Powered Detectors
Loop powered detectors require a two wire connection and the documentation will indicate
the positive and negative loop connections, usually brown and blue respectively.
At the System 57 end of the field cable the two detector wires should be connected to the S
(positive) and 01 (negative) terminals of the appropriate channel on the Quad Relay
Interface Card that is attached to the required Four Channel Control Card.
8.6.1 4-20mA loop powered detector (measuring resistor in supply
return)
01
-
+
28
27
Detector
S
5704 Quad Card
The diagram shows the detector connections for Channel 1. Channel 2, 3 and 4 connections
are similar and their terminal connection numbers are shown in section 7.
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