FDR - Theta - Probe



Delta-T Devices

115000

Theta-Probe ML2

 

 

The Theta Probe ML2 is a soil moisture measuring probe for determining, at 1000 MHz, the relative permittivity and the ionic conductivity of the soil between the electrodes and deriving therefrom a measuring signal in the range of  0 ... 1 V.

The soil volumetric water content is derived via calibration functions.

The probe can be operated with either data logger or hand device.

Additional, the calibration of data measure can be fed for mineral or organic soils.

 

 

 

Technical parameters: 

Measuring range of vol. water content

0 ... 100%

Accuracy of measurement 

 

  • in moisture range 5 ... 60 %
  •  in temperature range 0 ... 40 °C
  • < ± 2% of final value after calibration for defined soil type
  • ± 5%  of final value with internal calibration for standard soils

Recorded soil layer

ca. 7 cm

Environmental effects

Long-term resistance when buried in ground and to water, no failure or corrosion

Stabilisation time

30 s after switch-on

Time of operation

Continuous operation

Operating voltage

5 ... 15 V DC uncontrolled

Current consumption

typ. 20 mA

Output signal

0 ... 1 V DC at > 10 kOhm in the range of 0 ... 50 % vol. water content (non-linear)

Flex

Standard 5 m, max. 100 m

Size

Probe body diam. 40 mm x 125 mm, 4 antenna rods each 60 mm long

Optional accessories

  • Screw-on extension tubes, 50 cm and 100 cm
  • Moisture meter  HH2