EUTECH INSTRUMENTS ALPHA PH1000 PHORP CONTROLLERTRANSMITTER Manual de Instruções descarregar pdf (Página 9)

Instruction Manual alpha-pH 1000

3.2 Back Panel

Caution: Ensure electrical mains is disconnected before proceeding.

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. AC mains live wire 10. Alarm/Wash relay working position (NO)

2. AC mains neutral wire 11. Alarm/Wash relay common

3. AC mains protective earth wire 12. Alarm/Wash relay resting position (NC)

4. Low set relay resting position (NC) 13. Hold function switch terminal 1

5. Low set relay common 14. Hold function switch terminal 2

6. Low set relay working position (NO) 15. No connection

7. High set relay resting position (NC) 16. 0/4 - 20 mA for -ve connection

8. High set relay common 17. 0/4 - 20 mA for +ve connection

9. High set relay working position (NO)

Connections for the 5-way screw terminals:

18. Pt100/Pt1000 lead 1 terminal

19. Pt100/Pt1000 sense lead terminal

20. Pt100/Pt1000 lead 2 terminal

Note: If using a two-wire RTD, short terminal 19 to terminal 18.

Pt 100/Pt 1000 is selectable via an internal jumper. Factory default is Pt100. See Appendix 1 for

directions on switching the RTD type.

21. pH/ORP (potential matching pin)

21. pH/ORP (shield)

Pt100

RELAY A

100mA

(F)

FUSE 250VAC

HOLD

LARM / WASHRELAY B

Pt1000

PAL

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 (11

and 12). In the Wash mode, the relay works on a positive mode. Therefore, the Wash device should be

connected to the contacts 10 and 11.

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EUTECH INSTRUMENTS ALPHA PH1000 PHORP CONTROLLERTRANSMITTER Manual de Instruções Página 9