© 2010 Delta-T Devices Ltd
Page
5
Installation
1
Install the SM300
1.1 Plan cable runs
Locate the solenoid valve that controls the bed irrigation.
Plan where to splice into the cable to the valve, and then
consider where it makes sense to mount the GP1.
Depending on available extension cables, this will then
determine the general location for the SM300.
1.2 Choose a location for the SM300
If there’s more than one type of plant within the bed,
choose a variety that uses more water.
Choose a representative plant i.e.
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Not in the outside row
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Moderate growth
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Foliage won’t shed water unduly
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No voids in the growing media
Check the water content of potential control plants using an SM300 and HH2 if
available, otherwise by lifting the pots or feeling the compost. Avoid plants that
appear to be unusually dry or wet.
1.3 Insert SM300 into pot / soil
Screw the cable onto the sensor (attach the extension cable first if you are using
one, otherwise directly attach the logger cable which terminates in bare wires).
Make sure the connectors halves are clean and aligned before pushing together,
then push them fully home and tighten to maintain the seal.
Insert the SM300 into the pot as close to the centre as
reasonably possible
– see illustration above. Once inserted,
don’t joggle the sensor as this will create air gaps around the
measurement rods. You may find it useful to tape the cable to
the side of the pot.
Refer to the
SM300 Quick Start
Guide for more detail:
