2
different from the soil temperature, and which has at least 20 cm of cable buried in
the soil too.
Support for the ML3 is the same the support for the ML2, ML2x and SM300 -
described in the HH2 User Manual.
Trouble Shooting
My ML2x and ML3 don’t agree
Cause
The ML2x conversion table is optimised for water at 0 mS.m
-1
The ML3 table is optimised to be most accurate at a salinity of 150 mS.m
-1
.
This is the typical value in real soils, and helps extend the range of salinity over which
soil moisture readings may be taken.
Solution
When using an ML2x as well as an ML3 select the ML2 Special look-up table for the
ML2.
This is optimised for use at 150 mS.m
-1
and so should give the best agreement with
the ML3.
This solution requires HH2 Firmware version 2.7 and HH2Read
version 2.7 or later.
How to upgrade your HH2
Support for ML3 is provided in version 2.7 of the HH2 firmware and version 2.7 of
the PC software HH2Read.
Older versions of the HH2 Moisture Meter can be upgraded to work with the ML3 –
see HH2 upgrades section in our price list for details. This requires the HH2 to be
sent back to Delta-T or our distributor.
Which version do I have?
To check which version of HH2Read that you currently have, run HH2Read on your
PC and select Help. About.
To check which version of firmware in the HH2 connect it to your PC via e.g. COM1
and select the Version button in HH2Read
Upgrade Options
1) Complete upgrade. This upgrades both HH2 firmware and PC software
and is the best option.
Either return your HH2 to Delta-T for an HH2 factory upgrade or ask you
local distributor to do it. Contact us for prices and shipping instructions.
2) Partial upgrade for HH2Read only: Download HH2Read version 2.7 or
later from the Delta-T website or the Delta-T Software and Manuals DVD
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