Delta-T HH2, User Manual

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Technical Reference Moisture Meter User Manual 4.0
Incorrect Readings being obtained
Check the device is connected to the meter correctly.
If using a converter, then check that it is not damaged. If you have spare converters
then try one of those.
If you have fitted a connector to the device yourself using the Delta-T adapter kit (type
DSK1) then check that the wiring has been correctly applied and that the wiring
connections are good with no interference from other connectors, for example solder
applied to one wire may be touching another.
Check the sensor user manual. Check that you are using it correctly e.g. is it being
inserted into the ground correctly?
Check the user manual to see if the device is being used in soil conditions which the
device is incapable of measuring.
Has the meter been set up with incorrect soil moisture values e.g. a0 and a1 values
may be incorrect for this soil type?
If you are getting zero for mm Deficit check you have entered a value for Root Depth.
If you are getting a negative value for mm Deficit you may be using too low a value
for Field Capacity.
Has the meter been set up with the correct device?
If you have other equipment to measure the device then do so. You can check if the
results are the same and hence prove whether there is a fault with the device.
Zero Readings obtained
If you are getting zero for mm Deficit check you have entered a value for Root Depth.
If the soil moisture value is always reading zero, then an additional test to those in the
previous section is to check the battery.
Sensors will only return a signal voltage if the meter applies a voltage. This voltage is
taken from the meter’s battery.
Check the battery voltage is above 5V. Any less and the device may not be able to
take a reading.
Note: WET sensors need more than 6 V.