Campbell Scientific CS431 Submersible Pressure Transducer - Manual (Page 19)

CS431 Submersible Pressure Transducer
The best method for minimizing ground loops is to tie all equipment (sensors,
dataloggers, external power sources and any other associated equipment) to a
single common grounding point.
To prevent grounding issues, do the following:
(1) Attach the sensor cable shield (the wrapped shield inside the cable) to the
power ground (G terminal) on the datalogger.
(2) Use a 12 AWG or larger wire to connect the datalogger’s grounding lug
with a grounding rod that has been driven into the earth.
(3) If using an external power supply, tie the power supply and datalogger to
the same earth ground.
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