Troubleshooting; Troubleshooting The Soil Moisture Sensor - Stihl SMI 50 Manual De Instrucciones

7 Troubleshooting

7 Troubleshooting
7.1

Troubleshooting the Soil Moisture Sensor

Condition
No output signal from
sensor.
Soil moisture sensor does
not show correct reading
or does not trigger correct
reaction from irrigation
controller.
Soil moisture sensor
shows incorrect moisture
reading in frosty
conditions.
0458-817-9921-A
Cause
Cable is not properly connected.
Cable is damaged.
Cable extension is not correct.
There is an air gap between the sensor
and soil.
Cable extension is not correct.
Cable has been extended correctly but is
too long.
Cable has been extended but contacts
have not been properly insulated.
Soil moisture sensor is buried in a plant
pot that is too small.
Sensor reacts to liquid water in soil.
Liquid water turns to ice in frosty
conditions. Soil moisture sensor cannot
produce correct measurements.
Remedy
► Connect cable correctly.
► Replace the soil moisture sensor.
► Extend the cable correctly, @ 4.2.
► Bury the soil moisture sensor completely and
correctly.
► Extend the cable correctly, @ 4.2.
► Do not extend cable beyond maximum length of
100 meters, @ 4.2.
► Extend the cable correctly and insulate contacts
properly against soil moisture, @ 4.2.
► Bury the sensor in a plant pot with a volume of at
least 1 liter and at a distance of at least 5 cm from
the side.
► Repeat measurement at a temperature above
freezing. It makes no sense to perform
measurements or irrigation at temperatures below
freezing.
► If the soil moisture sensor continues to show an
incorrect moisture reading: Replace the soil
moisture sensor.
The sensor is defective.
English
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