Back Panel - EUTECH INSTRUMENTS ALPHA CON 1000 CONDUCTIVITY CONTROLLERTRANSMITTER (REVISION 3) Instruction Manual

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.
ENSURE that the power cable is physically separated from the power
supply.
Connection for the 17-way screw terminals (from left to right):
1. AC mains live wire
2. AC mains neutral wire
3. AC mains protective earth wire
4. Low set relay resting position (NC)
5. Low set relay common
6. Low set relay working position (NO)
7. High set relay resting position (NC)
8. High set relay common
9. High set relay working position (NO)
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
FUSE 250VAC
63mA (F)
L
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.
Pt100/
Pt1000
RELAY1 RELAY2
N PE
10. Alarm relay resting position (NO)
11. Alarm relay common
12. Alarm relay working position (NC)
13. Hold function switch terminal 1
14. Hold function switch terminal 2
15. No connection
16. 0/4 - 20 mA for -ve connection
17. 0/4 - 20 mA for +ve connection
cell
J2
ALARM
HOLD NC
4
αlpha-CON1000
+
-