Appendix d. datalogger connection to a relay – Campbell Scientific OBS-3+ and OBS300 Suspended Solids and Turbidity Monitors User Manual
Page 51
Appendix D. Datalogger Connection to
a Relay
The CR10, CR7, CR510, and 21X dataloggers do not have a switched 12 V
channel. Either the sensor can remain on or a relay may be used to switch the
power on and off. FIGURE D-1 shows the relay connections.
12V
C1
G
G
SE1
SE2
AG
Black
White
Blue
Green
FIGURE D-1. Wiring diagram for connecting an OBS sensor to
an external relay and a datalogger
1. The assignment of channel number (for example, SE Channel
1 or C1) may vary depending on the application.
2. You may use a relay such as Campbell Scientific pn 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
D-1
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