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Instruction Manual αlpha CON 2000
11
3.2 Connection Diagram
Caution: Ensure electrical mains are disconnected before proceeding.
Connections for wall mounting version
LN
PT100/
PT1000
Current
HOLD
OP2
Current
OP1
1
23
13 14
4
5
67
89
10
11
12
15
16
17
18 19 20 21 22 23 24 25
3029282726 31 32 33
Anti-surge
PT1000
PT100/
1
L
2
N
Current
15
Current
13
OP2
14
16
OP1
17
3 4
5
6
22
HOLD
GND
18 19 2120 23 24 25
7 8 9
10
11
2926 2827 30 31 32 33
12
250V, 315 mA,
Anti-surge
1. AC mains live wire 18. 12V Power supply
2. AC mains neutral wire 19. Hold function
3. AC mains protective earth wire 20. Hold function
4. Relay A (SP 1) 21. Earth ground
5. Relay A (SP 1) 22. no connection
6. Relay B (SP 2) 23. no connection
7. Relay B (SP 2) 24. no connection
8. Wash relay 25. no connection
9. Wash relay 26. Temperature ground
10. Alarm relay (NC) 27. Temperature Sense
11. Alarm relay common 28. Temperature Input (short to terminal
12. Alarm relay (NO) 27 if using 2- wire RTD)
13. 4-20 mA temperature output, +ve terminal 29. no connection
14. 4-20 mA temperature output, -ve terminal 30. 4 Cell type Conductivity Input
15. 4-20 mA Conductivity output, +ve terminal **31. 4 Cell / 2 Cell type Conductivity Input
16. 4-20 mA Conductivity output, -ve terminal **32. 4 Cell / 2 Cell type Conductivity Input
17. 12V ground
33. 4 Cell type Conductivity Input
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 (10 & 11).