SM150 Soil MoistureSensor
The SM150 Soil Moisture Sensor measures volumetric soil moisture content with 3% accuracy. It offers precision and reliability at an extremely affordable price.
Instant readingsThe SM150 Soil Moisture Kit is a simple, convenient, low cost option for making soil moisture measurements on the move. The kit comprises an SM150 Soil Moisture Sensor, a dedicated HH150 Moisture Meter and a handy carry case. The HH150 Meter is very easy to use, being a readout-only device (no PC connectivity).
The Delta-T Devices HH2 Moisture Meter is also compatible with the SM150 Soil Moisture Sensor, and offers data storage and download capability. [HH2 Meters purchased before 2012 will need an upgrade to work with the SM150.]Data loggingThe SM150 Soil Moisture Sensor is compatible with all Delta-T Devices Loggers and its 0 to 1V DC output can be handled by most other types of data logger. It is built to the same high standards as other Delta-T Devices soil moisture sensors, but is more affordable.
Easy installationThe SM150 Soil Moisture Sensor is buriable and its cylindrical shape makes it easy to install in augered holes (45mm diameter). The threaded base of the sensor can be connected to optional 50cm and 100cm extension tubes. Two sharp pins minimise soil and substrate disturbance during insertion and permit superior contact for more accurate measurements. The SM150 use the same high quality range of cables and extensions as the SM300 Sensor.ResearchThe SM150 Soil Moisture Sensor measures volumetric soil moisture content with 3% accuracy. It is a research grade sensor, being stable across a wide range of temperatures and salinity.
IrrigationAccuracy and ease of use make SM150 Soil Moisture Sensors well suited to irrigation applications. Readings can be used to optimise irrigation scheduling, or the SM150 can be installed as part of an automatic irrigation system. The sensor's compact size allows it to be installed in plant pots or grow bags.
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3.0% (± 0.03m3.m-3)
Note [2]
Measurement range
Full accuracy over 0 to 70%
Measures full range up to 100% with reducedaccuracy
Salinity range
100 to 1000mS.m-1
Salinity errors < 5% from 0 to 60%
Temperature range
Full accuracy over 0 to 60°C
Moisture content readings in frozen soil are notmeaningful
Output
0 to 1.5V differential
Corresponding to ~ 0 to 100% nominal
Sample volume
~55 x 70mm diameter
Sample volume extends to ~1 litre, but is weighted towards soil immediately surrounding the rods
Power requirement
5 to 14V, ~18mA for 1s
Environmental
IP68
-20 to +60°C operating range
Dimensions
143 x 40mm diameter
Weight
0.1kg
Excluding cables
Sensor calibration
Sensors are fully interchangeable
Individual sensor calibrations not required
Logger / Meter compatibility
GP1, DL6, DL2e, HH150 and HH2
Note [3]
[1] Accuracy figures are quoted at an expanded uncertainty coverage level of k=2 (95% confidence levels).
[2] Accuracy at sample conductivity 220mS.m-1, additional salinity errors as stated above.
[3] Maximum cable lengths: 100m for GP1, DL6 and DL2e data loggers.
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