Connect The Alarms And Relays; Connect To A Toc Offline Signal (Optional) - Hach Event Monitor Trigger System Manual Básico Del Usuario

Figure 4 Connect a WDMPsc or sc1000
1 White wire, IN (+)
2 Green wire, IN (–)

Connect the alarms and relays

The monitor has four digital outputs that supply 12 VDC at 20 mA to external, isolated solid-state
power relays or other similar resistive loads. The external relays must not exceed 28 VDC/VAC at
15 A maximum.
Refer to General wiring procedure
Function
Sampler activation
Alarm
Treatment/Chemical feed 1
Treatment/Chemical feed 2

Connect to a TOC offline signal (optional)

The monitor has one digital input for connection to the TOC offline sensor. Refer to
procedure on page 9,
Wire
Red
Black
10 English
on page 9 for wiring instructions.
Table 2 Relay connections
Figure 4 on page 10 and
Table 3 Wiring information – TOC offline signal
3 Strain-relief fitting
Table 2
From
+ Relay 0
+ Relay 1
+ Relay 2
+ Relay 3
Table 3.
Connection
+ TOC relay out
– TOC relay out
gives the relay functions.
To
– Relay 0
– Relay 1
– Relay 2
– Relay 3
General wiring