© 2010 Delta-T Devices Ltd
Page
9
4
Check the system
4.1. Check the SM300 readings and relay operation
In the main
DeltaLINK
window, select the
Sensor
view. Click on
Read now
and
check that the SM300 is giving sensible readings.
By withdrawing and re-inserting the SM300 partially from the soil/compost you can
simulate drying/wetting and check the relay operation as in this (rather artificial)
example.
Note
: you should be able to hear the GP1 relay switching, but it may be
convenient to attach a multi-meter to the end of the control cable, so that you can
check the switching remotely.
When finished, click on
Cancel
to stop the readings, and if you have been
checking the readings by withdrawing the SM300,
re-insert it in a new hole
.
Moisture level (
) falls below set
level (25%),
ON
condition (
) is
triggered, and control relay (
)
switches on.
Moisture level rises above 25%,
so
ON
condition is no longer
met, but irrigation will continue
until
OFF
condition is met.
Moisture level rises above 40%,
OFF
condition (
) is met and
control relay (
) switches off.
