Lecturer in Physical Geography
University of Newcastle
Choosing equipment that you have complete trust in to record the data you need, and, importantly, technical backup when challenges arise, were fundamental requirements for us. When you are running out of time (and daylight) in a remote banana field it was reassuring that someone at Delta-T was responding so quickly to our technical questions.
The Delta-T devices kit has been first class – it has not missed a beat since we installed the equipment. We now plan to leave the SM150T sensors in-situ after the project to continue developing our understanding of the soil-water fluxes under banana crops." Prof Jerry Knox
Cranfield Water Science Institute,
Cranfield University, UK
York University, Toronto
- Complete low-cost kit
- ± 3% accuracy
- Portable and easy to use
The SM150 Soil Moisture Kit provides an affordable and easy-to-use tool for obtaining reliable moisture measurements with minimal soil or substrate disturbance.
The kit comprises an SM150T* Soil Moisture Sensor, a dedicated readout meter and a carry case. The cable and connector are watertight – an essential requirement for potentially wet environments.
The meter displays volumetric water content (% volume). Please note that although the SM150T Sensor has a built-in temperature sensor, the meter does not measure or display temperature.
The meter is lightweight and is very easy to use, being a readout-only device (no data recording or PC complications). Operation is simple – just insert the SM150T into the soil or substrate and press the Read button to make a reading.
The SM150 Kit comes with substrate calibrations for mineral, peat mix, coir, mineral wool and perlite (plus also provides raw voltage output) – providing a rapid, rugged solution for checking the uniformity of growing conditions for many types of growing media.
The SM150T is easy to insert and install – its sharp pins minimise soil disturbance and preserve the original soil structure around the measurement rods.
Other Delta-T soil moisture kits
Two alternative Delta-T Devices moisture measurement kits are available if greater accuracy or electrical conductivity (EC) measurements are required.
*The SM150 Kit was previously supplied with the SM150 Sensor, but now comes with the SM150T Sensor.
|Measurement||Volumetric water content and soil temperature|
|Accuracy||± 0.03 m3.m-3 (3%) |
With soil-specific calibration
|± 0.5°C (0 to 40°C for temp sensor) |
± 0.75°C (-20 to +60°C for temp sensor)
|Soil moisture measurement range||Full accuracy over: |
0 to 0.7 m3.m-3
|Full range : 0 to 1.0 m3.m-3|
|Salinity range||50 to 500 mS.m-1|
|Salinity errors < 0.035 m3.m-3 from 0.05 to 0.4 m3.m-3. Can be calibrated up to 2000 mS.m-1|
|Temperature range||Full accuracy over: 0 to 40°C|
|Output||0 to 1.0 V differential |
Corresponding to 0 to ~0.6 m3.m-3
|Resistance 5.8Ω to 28Ω for temp sensor|
|Power requirement||5-14 V, ~18 mA for 1s|
|Minimum 5 V with 100 m cable|
|Environmental||IP68 (-40 to +70°C)|
|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||Mineral, peat mix, coir, mineral wool, perlite - and also raw voltage output|
|Accuracy||0.5% of full scale over 5-40 °C (±7.5mV – negligible effect on SM150 accuracy)|
|Resolution||0.1% of voltage reading|
|Battery life/standby life||2 x GP alkaline AAA/ 10000 readings/1 year|
|Compliance||CE, FCC & ROHS|