The probes HD3910.1 (two electrodes) and HD3910.2 (three electrodes) measure the soil volumetric water content (VWC) by using a capacitive measurement principle which allows fast measurements in the field and with minimal invasiveness.

The three-electrode probe HD3910.2 is particularly suitable for the measurement in small volumes, for example for cultivations in pots.

The probes are factory-calibrated and do not require any further calibration by the end user.

The circuit board is protected inside a housing made of plastic material and sealed with epoxy resin which allows achieving reliable measurements even in harsh environmental conditions.

The version with RS485 digital output with MODBUS-RTU protocol allows the use of even very long connection cables. It can be connected to the data loggers HD32MT.1 and HD32MT.3 or to any other data logger with RS485 MODBUS-RTU input.

The version with SDI‑12 digital output is compatible with version 1.3 of the protocol and can be connected to the data logger HD32MT.3 or to any other data logger with SDI‑12 input.

The version with analog output has two 0.5…3 V standard voltage outputs: one for the volumetric water content and one for the temperature. On request, 0…2.5 V, 0…5 V or 0…10 V outputs.

The probes are equipped with a fixed cable, 5 or 10m standard length, with open wires at the end.

Measurement of the soil volumetric water content with 2 electrodes (HD3910.1) or 3 electrodes (HD3910.2) for restricted volumes
Measurement of the soil temperature
Various output options available (depending on model): digital RS485 with MODBUS-RTU protocol, digital SDI‑12 or analog voltage
Accurate and stable measurements over time
Ingress protection IP 67
Minimal invasiveness in the soil
Easy to install

Applications:

Agriculture
Hydrology
Geology

Downloads

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data sheet German (1.51 MB)

1.51 MB

data sheet English (1.83 MB)

1.83 MB