EUTECH INSTRUMENTS alpha-pH 2000D Manuel d'instructions télécharger pdf (Page 16)

Instruction Manual αlpha-pH2000D

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3.2 Connection Diagram

Caution: Ensure electrical mains are disconnected before proceeding.

Connections for wall mounting version

Current

OP2

OP1

HOLD

18 19 2120 23 24 25

8 9

2926 2827 30 31 32 33

-5

SENS TEMP

Fuse: 250V 315 mA,

Time Delay

Cur re nt

OP2

Cur re nt

OP1

HOLD

18 19 20

22 23

6 7

26 27

-5V

TEMP

SENS

REF

32 33

250V, 315 mA,

Time Delay

1. AC mains live wire 18. 12V output 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. Shield (drain wire)

10. Alarm relay (NC) 27. -5V to differential pH sensor (White wire)

11. Alarm relay common 28. Temperature ground (black wire)

12. Alarm relay (NO) 29. Temperature Sense (Yellow wire)

13. 4-20 mA temperature output, +ve terminal 30. Temperature Input (Yellow wire)

14. 4-20 mA temperature output, -ve terminal (Internally connected by jumper to terminal 29)

15. 4-20 mA pH/ORP output, +ve terminal 31. No connection

16. 4-20 mA pH/ORP output, -ve terminal 32. pH input, Reference (Green wire)

17. 12V output ground 33. pH input, Measure (Red wire)

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).

-5V

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 51 52

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EUTECH INSTRUMENTS alpha-pH 2000D Manuel d'instructions Page 16

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