Class leading ± 1% soil moisture accuracy
Complete kit with readout unit & case
The ML3 ThetaKit provides researchers with a portable tool for highly accurate, near instantaneous measurement of moisture levels in soils and substrates.
The ThetaKit is easy to use. Simply switch the connected HH2 Moisture Meter on, insert the probe pins fully into the soil, and press the HH2’s “read” button to display the moisture measurement. Readings can then be stored with a single button press (if required) – and downloaded to PC later.
The kit comprises an ML3 ThetaProbe Soil Moisture Sensor, an HH2 Moisture Meter (readout unit), replacement sensor rods, and a carry case.
NB: Other moisture measurement kits are available if lower cost or EC measurements are required.
Measurement Volumetric water content and soil temperature
Accuracy
± 0.01 m3.m-3 (1%)
With soil-specific calibration
± 0.5°C (0 to 40°C for temp sensor)
± 0.75°C (-20 to +60°C for temp sensor)
Soil moisture measurement range
Full accuracy over:
0 to 0.5 m3.m-3
Full range : 0 to 1.0 m3.m-3
Salinity range
50 to 500 mS.m-1
Salinity errors < 0.035 m3.m-3 from 0.05 to 0.4 m3.m-3. Can be calibrated up to 2000 mS.m-1
Temperature range Full accuracy over: 0 to 40°C
Output
0 to 1.0 V differential
Corresponding to 0 to ~0.6 m3.m-3
Resistance 5.8Ω to 28Ω for temp sensor
Power requirement
5-14 V, ~18 mA for 1s
Minimum 5.5 V with 100 m cable
Environmental
IP68 (-40 to +70°C)
Sample volume
~60 x 30 mm diameter
Sample volume is weighted towards soil immediately surrounding the rods
Dimensions and weight
Overall: 158 x 40 mm diameter
Rods: 60 mm x 3.2 mm diameter
(Rods are replaceable)
Weight: 0.1 kg (exc. cable)
Sensor calibrations
Individual sensors are interchangeable
Recalibration advised every 3 years (depending on use)
Soil calibrations Generalised Mineral and Organic soil calibrations are supplied
HH2 Meter
Input connections 1 water content sensor or 1 WET Sensor
Control outputs –
Readings stored 1,500
Recording rate –
Configuration By keypad
Communication options RS232 / USB [1]
Sensor excitation 1 switched battery
Power 1 9V 6LR61 (PP3)alkaline
Battery life (dependent on usage) ~ 5,000 readings
Enclosure rating IP54
Temperature range 0 to +40°C
Display 2 line x 16 character
Size 125 x 80 x 45mm
Typical applications Instantaneous reading of soil moisture / profiles/ WET Sensor
