Notes: 1. Where a sensor is earthed locally, either to an Earth Stud or
through the sensor casing or mounting, to avoid earth loops
the screen sheath of the cable should only be connected at
one end.
2. The above diagram shows the sensor connections for Channel
1. Channels 2, 3 and 4 connections are similar and their pin
connection numbers are shown below:
Channel Sensor Connection
01 NS
Quad Relay 1 17 19
Interface Connections 2 18 20
3 23 25
4 24 26
Three Wire Control Card Current Sink, Transmitter Current
Source Connection for Series 2000 Flammable
(Signal Returned to 0V)
Screened Cable
Arrows Indicate
Direction of Loop
Current Flow
01
NS
Quad Relay Interface Card
05704-A-0121
Earth Stud
+24V
4 - 20mA (-)
0V
GND
Series 2000
Flammable
17
19
11
4
9
2
3
Link tted for
Transmitter Source
Cabinet
Protective
Earth
+24V*
0V*
* 24V supply may be obtained
from either the cabinet or a
separate eld supply
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