ML3 - ThetaProbe Soil Moisture Sensor
With its 1% accuracy the ThetaProbe sets the global standard for soil moisture measurement sensors - and also adds the benefit of in built soil temperature measurement (when buried).
Highy accurate yet easy to use
With the ML3 ThetaProbe Soil Moisture Sensor it's easy to make reliable, accurate soil moisture measurements. Simply insert the soil moisture probe into the soil, connect to your data logger or readout unit, provide 5-15V DC at 20mA, and within seconds you can be logging soil moisture.
The ML3 ThetaProbe is robust, buriable and maintenance free (environmentally protected to IP68) . It can be easily installed at depth into augered holes using the optional extension tubes.
ML3 improvements over its predecessor (the ML2x)
The addition of a thermistor sensor to this latest iteration of the ThetaProbe enables the simultaneous logging of soil temperature with soil moisture. In addition, a new cabling system makes it simple to extend or replace cables. With a choice of 1m, 5m, 10m and 25m extensions, flexible configurations are now possible.
The ML3’s salinity response has also been improved - its output has been characterised at EC values up to 2000 mS.m-1. The temperature range has also been improved - allowing operation at temperatures as low as -40 degrees C (non-flexing cables).
Data logging and readout
The ML3 can be logged by any Delta-T data logger, including the new GP2. It is compatible with any logger that can provide 5 - 15V DC excitation power and will accept the 0 - 1V output signal. For portable applications the ML3 connects to the HH2 Moisture Meter and they can be ordered together as the convenient ThetaKit.