Campbell Scientific OBS3 Turbidity Sensor User Manual
Page 6
Interfacing the OBS-3 Turbidity Monitor with Campbell Scientific Dataloggers
2
Red
12V
1H
1L
G
G
White
Green
Black
Jumper
CR510, CR500
&
21X
FIGURE 2. Wiring Diagram of OBS-3 without Using Switched 12 V
- Load +
#7321
RELAY
- Control +
12v
C1
G
G
1H
1L
G
Red
Black
White
Green
Jumper
Datalogger
FIGURE 3. Wiring Diagram for Connecting an OBS-3 to
an External Relay and a Datalogger
1. The assignment of channel number (e.g., Diff Channel 1 or
C1) may vary depending on the application.
2. You may use a relay such as Campbell Scientific part #7321
instead of the switched 12 V connection on the CR10(X),
CR1000, and CR23X wiring panel. Since the CR510 wiring
panels do not have switched 12 V, you will need an external
relay if you need to conserve battery power.
NOTE
CR510
&
21X
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