SWM 5000
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2.2. Product overview
The SWM 5000 is a handheld instrument for measuring soil moisture in
vol .-% (= volumetric water content) and temperature in ° C by means of
a 1m long stainless steel probe.
It has a 5-pin interface with a recessed lock in accordance with DIN
41524 for connecting the probe SWP 5000-1 or SWP 5000-3.
The probes are automatically recognized and the measurements are
displayed as a one- or three-fold result in the graphic display.
The operation is menu-driven via
the graphic display and the keyboard of the instrument
a smartphone (Bluetooth connection) with the "SWM
Companion" app.
The SWM 5000 can be operated either on the unit via keyboard and
display, or by the smartphone or in parallel of both.
The soil moisture is determined by means of the Frequency Domain
Reflectometry (FDR). This method uses the property of the water to
change the value of an electrical capacitor relatively linearly and thus the
frequency of a high-frequency oscillator. FDR has the advantage that
both solids (sand, loam, compost etc.) located in the soil and the
electrical conductivity of the water (salinity) have only a small influence
on the measurement result and can be compensated.
Both the humidity sensor with its high-frequency oscillator and the
temperature sensor are located at the appropriate place in the probe,
they are embedded in synthetic resin and thus protected against the
intrusion of solids and moisture. Already at the sensor, the measurement
results are converted into digital values and routed via a data bus line to
the SWM 5000, where they are evaluated, converted and displayed in
the data logger with sensor position, humidity, temperature, date and
time saved.
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