Hach-Lange SURFACE SCATTER 7 sc Turbidimeter - Manual (Page 28)

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Installation
Table 4 Wiring the SS7 sc at terminal block J5
Terminal number Terminal designation Wire color
1 Data (+) Blue
2 Data (–) White
3 Service request No connection
4 +12 V dc Brown
5 Circuit common Black
6 Shield Shield (gray wire in existing quick disconnect fitting)
Figure 15 Hard-wiring the SS7 sc
1 From SS7 sc 2 Disconnect power