SM150T - Soil Moisture and Temperature Sensor


Delta T


Note: The cable and accessories must be ordered separately.

239,00 €

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The Sensor measures: Temp. & Soil Humidity
Output Signal: 0 - 1 Vdc
Power Supply: 5-14 V, ~18 mA

Soil Moisture and Temperature Sensor

  • Dependable ± 3% soil moisture accuracy  
  • Built in temperature measurement
  • Robust and buriable, with 5 year warranty

The new SM150T measures soil moisture and temperature with research-grade accuracy. It offers stable, robust and reliable performance at a great price.

Research grade sensor

The new SM150T’s advanced patented electronics and tough build produce a highly dependable sensor with exceptional salinity and temperature stability. The SM150T is engineered to withstand long term burial – the sensor, connectors and cable are all environmentally protected to IP68. It offers moisture accuracy of ± 3% (after soil specific calibration) and the built in temperature sensor achieves ± 0.5°C.

Data logging and readout

The SM150T is a dual purpose probe – it can be used portably for instant moisture readings, or left installed in the soil connected to a data logger, to provide long-term moisture and temperature data.

For installed sensors:
The SM150T can be logged by any Delta-T Devices data logger and by many loggers from other manufacturers (simple 0-1 V output for moisture, 10K thermistor for temperature). To record temperature the sensor must be fully buried and connected to a data logger.

For portable use:
The SM150T is available as part of the convenient SM150 Kit, complete with carry case and HH150 readout meter.  Find out more about the SM150 Kit.

Please note that the HH150 Meter supplied with the SM150 Kit is a readout-only device. If PC connectivity for data storage and download is a requirement, the SM150T should be used with the HH2 Moisture Meter instead.

NB: When used in portable mode the SM150T Sensor does not provide temperature indication.


The SM150T is easy to insert and install – its sharp pins minimise soil disturbance and preserve the original soil structure around the measurement rods. For burial at depth the cylindrical shape facilitates installation in augered holes. The threaded base of the sensor can be connected to optional 50cm and 100cm extension tubes, which assist with placement and removal.

The SM150T uses the same high quality range of cables and extensions as the ML3 and EQ3 sensors.


The SM150T comes complete with general calibrations for mineral and organic soils. A two-point soil specific calibration can be performed for greater accuracy if required.


Soil science – The SM150T is easy to install and provides accurate measurement of soil moisture and temperature – simplifying the vertical profiling of both parameters. (Temperature measurement requires burial of the probe).

Horticulture – With a length of only 143 mm (rods 51 mm), the SM150T can be installed in grow-bags and plant pots. For portable use, the SM150 Kit provides a simple, rugged solution to checking the uniformity of growing conditions across many types of growing media. Substrate calibrations include perlite, coir, peat, and mineral wool, as well as soils. SM150T for Horticulture use.

Irrigation –
The accuracy and ruggedness of the SM150T makes it a natural choice for system integrators – more information is available in the SM150T System Integrator Data Sheet.

Product history

The new SM150T replaces both the SM300 and SM150 Sensors, combining their strengths and offering great value.



Accuracy: ±0.03 m3.m-3 (3%) volumetric water content (VWC) ±0.5°C (0 to 40°C for temp sensor)

Soil moisture measurement range: 0 to 1.0 m3.m-3 (100%) but less accurate above 70% VWC

Salinity range: 50 to 1000 mS.m-1 ±5% vol over 100 to 1000 mS.m-1 and 0-60% VWC

Temperature range: Full accuracy over: 0 to 60°C

Output: 0 to 1.0 V differential. Corresponding to 0 to ~0.6 m3.m-3

Power requirement: 5-14 V, ~18 mA for 1s. Minimum 5 V with 100 m cable

Environmental: IP68 with Delta-T supplied cables

Sample volume: ~55 x 70 mm diameter. Sample volume is weighted towards soil immediately surrounding the rods

Dimensions and weight: Overall: 143 x 40 mm diameter. Rods: 51 mm x 2.5 mm diameter. Weight: 0.1 kg (exc. cable)

Sensor calibrations: Individual sensors are interchangeable. Recalibration advised every 3 years (depending on use)

Soil calibrations: Generalised Mineral and Organic soil calibrations are supplied


ML-INK1  ThetaProbe Insertion Kit
ML-RODS-3  Stainless steel rods for ML3 and ML2x
SMSC/sw-05   SMS sensor cable 5m, bare wire
SMSC/Iw-05   SMS cable 5m, long bare wire:
SMS cable 5m, long bare wire. IP68 M12 connector (f) to bare wire. Connects ML3 or SM150T Soil Moisture Sensor to data loggers. 200mm flying leads suited to DL2e Logger connection.
SMSC/d-HH2   Cable SMS to HH2:
SMSC/d-HH2 Cable SMS to HH2. IP68 M12 connector (f) to 25-way D socket. Connects ML3 or SM150T. Soil Moisture Sensor to HH2 Moisture Meter.
EXT/5W-01  1m extension cable, 5-way M12
EXT/5W-05  5m extension cable, 5-way M12
EXT/5W-10  10m extension cable, 5-way M12
EXT/5W-25  25m extension cable, 5-way M12
SM-AUG-100  Spiral Auger, 45mm diameter, length 1.2m.
ML/EX50  50cm Extension Tube for ML3, ML2x, SM300, SM150 and EQ2
ML/EX100  100cm Extension Tube for ML3, ML2x, SM300, SM150 and EQ2

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