SM150T User Manual 1.0
Operation
21
Logger Grounding
Sub-optimal grounding of a DC power supply and its cabling to a logger can
cause currents in the screen of the cable connected to a soil moisture sensor,
and so cause corrosion at the M12 connector of the SM150T. In addition, if
used in an electrically noisy environment - such as a farm or greenhouse -
then the presence of a ground loop can permit AC signals to inject noise and
so disrupt readings.
To minimise sensor cable-screen currents that can result from the DC power
supply unit and its cabling to the logger, earth the logger using a 1m long
copper-clad earth stake.
Figure 1 Showing the use of a 1m long copper-clad earth rod connected to a GP1
logger earth
