HD3910 Soil Volumetric Moisture And Temperature Probe thumbnail 1

Senseca

HD3910 Soil Volumetric Moisture And Temperature Probe

Capacitive soil moisture and temperature probes with 2- or 3-electrode designs.

Soil volumetric water content (VWC) 0…60% with 0.1% resolution
Soil temperature -40…+60 °C with ±0.5 °C accuracy
RS485 Modbus-RTU, SDI-12 or dual analog voltage outputs
Factory calibrated, IP67 protection and 5 m or 10 m cable

Quantity

Overview

The Senseca HD3910 series measures soil volumetric water content (VWC) using a capacitive measuring principle, providing fast and reliable measurements with minimal soil disturbance. The HD3910.1 features two electrodes with a measuring volume of Ø 100 mm × H 150 mm, while the HD3910.2 uses three electrodes for smaller soil volumes, such as potted plants, with a measuring volume of Ø 80 mm × H 110 mm. Both versions measure 0…60% VWC with 0.1% resolution and soil temperature from -40…+60 °C using a built-in NTC sensor.

The probes are available with RS485 Modbus-RTU, SDI-12 or dual analog voltage outputs for VWC and temperature, depending on the model. Each probe is factory calibrated and features an epoxy-sealed plastic housing with IP67 protection for reliable operation in challenging environmental conditions. Fixed 5 m or 10 m connecting cables provide flexible installation options, making the HD3910 series suitable for irrigation management, hydrological research and geological investigations.

Typical Applications

Soil moisture monitoring for agricultural irrigation management
Combined soil moisture and temperature monitoring
Soil moisture measurement in potted plants and restricted soil volumes
Hydrological studies of soil water content and hydraulic properties
Soil moisture analysis for geological investigations
Soil moisture monitoring through environmental data logging systems

Key Features

Capacitive soil volumetric water content (VWC) measurement
Two-electrode HD3910.1 and three-electrode HD3910.2 configurations
Measuring volumes of Ø 100 mm × H 150 mm and Ø 80 mm × H 110 mm, respectively
VWC measuring range of 0…60% with 0.1% resolution
Built-in NTC temperature sensor with -40…+60 °C measuring range and ±0.5 °C accuracy
RS485 Modbus-RTU, SDI-12 or dual analog voltage outputs for VWC and temperature, depending on model
Fixed 5 m or 10 m connecting cable with open wires
Epoxy-sealed plastic housing with IP67 protection
Factory calibrated with no user calibration required

Benefits

Soil moisture and temperature measurements from a single probe
Minimal soil disturbance for reliable field measurements
Two- or three-electrode designs to suit different soil measuring volumes
Flexible output options for integration with data loggers and monitoring systems
Ready to use: factory calibrated, no user calibration required
Epoxy-sealed housing with IP67 protection for reliable outdoor operation

Specifications

Volumetric Water Content (VWC) Measurement
Measuring principle	Capacitive
Measuring range	0…60% VWC
Resolution	0.1%
Accuracy (@ 23 °C)	±3% between 0…50% VWC (standard mineral soil, EC < 5 mS/cm)
Measuring volume – HD3910.1	Ø 100 mm × H 150 mm
Measuring volume – HD3910.2	Ø 80 mm × H 110 mm

Temperature Measurement
Sensor type	NTC 10 kΩ @ 25 °C
Measuring range	-40…+60 °C
Resolution	0.1 °C
Accuracy	±0.5 °C
Long-term stability	0.1 °C/year

Probe Configurations
HD3910.1	Two-electrode probe
HD3910.2	Three-electrode probe, suitable for restricted soil volumes such as pots
Measured parameters	Soil volumetric water content (VWC) and temperature
Calibration	Factory calibrated; no user calibration required

Output and Communication Specifications
RS485 digital output	Modbus-RTU protocol
SDI-12 digital output	SDI-12 protocol, version 1.3
Analog outputs	Two separate voltage outputs: one for VWC and one for temperature (analog models only)
Analog voltage ranges	0.5…3 V, 0…2.5 V, 0…5 V or 0…10 V, depending on model

Electrical Specifications
Power supply – RS485	5…30 Vdc
Power supply – SDI-12	6…30 Vdc
Power supply – Analog 0.5…3 V	5…30 Vdc
Power supply – Analog 0…2.5 V	3.6…30 Vdc
Power supply – Analog 0…5 V	7…30 Vdc
Power supply – Analog 0…10 V	12…30 Vdc
Current consumption – RS485	2 mA average / 15 mA peak @ 12 Vdc
Current consumption – Analog	2.5 mA average / 15 mA peak @ 12 Vdc
Current consumption – SDI-12	300 µA standby / <15 mA during measurement @ 12 Vdc

Environmental
Sensor operating temperature	-40…+60 °C
Protection degree	IP67
Housing protection	Plastic housing sealed with epoxy resin

Mechanical and Connection
Handle material	Polypropylene (PP)
Electrode material	Copper on glass epoxy substrate
Electrode thickness	2 mm
Connecting cable	Fixed 4-pole cable ending with open wires
Cable length	5 m or 10 m, depending on model
Weight	Approximately 150 g (including 5 m cable)
Installation orientation	Any orientation; vertical installation recommended

Drawing

Downloads

HD3910 Family Datasheet	DownloadHD3910 Family Datasheet
HD3910 Family User Manual	DownloadHD3910 Family User Manual
HD3910 Family CE Declaration of Conformity	DownloadHD3910 Family CE Declaration of Conformity