Download EUTECH INSTRUMENTS ALPHA DO 1000 DISSOLVED OXYGEN CONTROLLERTRANSMITTER Instruction manual

αlpha-CON1000
Operating Instructions
3.2
Back Panel
The back panel consists of two connectors. The first connector is the 17-way PCB edge connector and
the other is the 5-way connector.
Connection for the 17-way screw terminals (from left to right):
1.
2.
3.
4.
5.
6.
7.
8.
9.
AC mains live wire
AC mains neutral wire
AC mains protective earth wire
Low set relay resting position (NC)
Low set relay common
Low set relay working position (NO)
High set relay resting position (NC)
High set relay common
High set relay working position (NO)
10.
11.
12.
13.
14.
15.
16.
17.
Alarm relay resting position (NO)
Alarm relay common
Alarm relay working position (NC)
Hold function switch terminal 1
Hold function switch terminal 2
No connection
0/4 - 20 mA for -ve connection
0/4 - 20 mA for +ve connection
Connections for the 5-way screw terminals:
18. Pt1000/Pt100 lead 1 terminal
19. Pt1000/Pt100 sense lead terminal
20. Pt1000/Pt100 lead 2 terminal
21. Conductivity lead 1
22. Conductivity lead 2
Pt100/
Pt1000
cell
FUSE 250VAC
63mA (F)
J2
RELAY2
ALARM
HOLD
NC
-
N
+
RELAY1
L
PE
IMPORTANT: The Alarm relay functions as an “Active Low” device i.e. it switches OFF under
Alarm condition. Therefore the Alarm display device should be connected to the ‘NC’ contacts of
the relay.
68X216802
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