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).
It is easy to make reliable, accurate soil moisture measurements with the ML3 ThetaProbe soil moisture sensor. Simply insert the soil moisture probe into the soil, connect to a data logger or read-out unit, provide 5-15V DC at 20mA, and log soil moisture within seconds.
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.
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 1, 5, 10 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).
The ML3 can be logged by any Delta-T data logger, including the 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. They can be ordered together as the convenient ThetaKit.