Page 21
User Guide
Model 4200 Dust & Opacity Monitor
7.2.1 Flexible Conduit Size
The sockets also have a PG9 thread suitable for connecting directly to flexible
conduit. PG (Panzerroht Gewind) is a European conduit thread size used
extensively throughout the continent for electrical applications.
Signal Cable Socket/Plug Terminations
Plug pin number
Description
Normal Terminal State
1
System OK Relay
Open
2
System OK Relay
Closed
3
System OK Relay
Common
4
High Alarm Relay
Open
5
High Alarm Relay
Closed
6
High Alarm Relay
Common
7
Current Loop Output
+ve
8
Current Loop Output
-ve
9
Current Loop Output
Screen
Fig. 7-1
Power Supply Socket/Plug Terminations
Plug pin number
Normal Terminal State
1
Line/Live
2
Return/Neutral
3
Not Used
Ground/Earth
Note
The normal state of the relay contacts is when the condition is System OK
and the Alarm is not active.
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