Delta-T HH2, User Manual

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WET Sensor

43
Soil Type
WET sensors require a soil type to be selected, because the soil moisture calculation
uses a soil-specific calibration table.
Tables for the standard soils listed below are pre- installed in the HH2.
You can install 5 custom tables using your own soil calibration data if you have any.
Support for special horticultural soils may be purchased. To install these you need to
return your HH2 to Delta-T. Please contact us first for shipping instructions.
Options:
Standard soil calibrations - M ineral, Organic, Clay, Sand.
Custom soil calibration - Custom 1, Custom 2, Custom 3, Custom 4,
Custom 5.
WET-ST1 table - Coir, Peat-based, Mineral wool v, Mineral wool h, Glass
wool h, Min g/h soil, Pot soils. (See WET User Manual).
WET-GS1 table - Stonewool h & Stonewool v. (See WET User Manual).
Select Options, Soil Type
Select a soil and press Set .
Soil Set-Up
b0 and b1
These can only be changed for Custom Soils installed by the user.
Refer to your WET User manual for the significance of these settings
Options: b0 1.0...2.0 Default : 1.0
b1 1.0...8.5 Default : 7.0
Select
Options, Soil Set-Up, b0
Select a soil and press Set .
Parameter
The soil parameter represents the soil permittivity for which the bulk conductivity is
zero. It is non zero because dry soils are polarisable.
Refer to your WET User manual for more information.
Options: 1.0...4.0 Default : 4.1
Select
Options, Soil Set-Up, Parameter
Select a value and press
Set
.
Field Capacity
A value for the Field Capacity must be set if you want to display soil moisture deficit.
See also: "Water Deficit Explained" on page 103.
"Field Water Capacity Values" on page 106.
Options: 0...1 Default: 0.38 m
3
.m
-3
Select Options, Soil Set-Up, Capacity
Select a value and press Set .