Instruction manual

Instruction Manual αlpha CON 2000

Connections for panel mounting version

1. AC mains live wire **17. 4 Cell / 2 Cell type Conductivity Input

2. AC mains neutral wire 18. 4 Cell type Conductivity Input

3. AC mains protective earth wire 19. 12V Power supply

4. Relay A (SP 1) 20. 12V ground

5. Relay A (SP 1) 21. no connection

6. Relay B (SP 2) 22. Earth ground

7. Relay B (SP 2) 23. no connection

8. Wash relay 24. Temperature ground

9. Wash relay 25. Temperature input

10. Alarm relay (NC) 26. Temperature sense (short to

11. Alarm relay common terminal 25 if using 2- wire RTD)

12. Alarm relay (NO) 27. no connection

13. Hold function 28. 4-20 mA temperature output, -ve terminal

14. Hold function 29. 4-20 mA temperature output, +ve terminal

15. 4 Cell type Conductivity Input 30. 4-20 mA Conductivity output, -ve terminal

**16. 4 Cell / 2 Cell type Conductivity Input 31. 4-20 mA Conductivity output, +ve terminal

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).

** When using 2 Cell type Conductivity electrode, terminal 15 should be shorted to

terminal 16 and terminal 18 should be shorted to terminal 17.