SM150 Soil MoistureSensor
SM150 Kit - Instant readings The SM150 can be used with the NEW Delta-T Devices HH150 meter for instant readings. This combination forms the SM150 Soil Moisture Kit, which comes in a handy carry case as standard. For more information about the SM150 Kit, click hereFor users who need a meter that can store readings for downloading to a PC, the HH2 Moisture Meter is suitable.
[HH2s supplied before 2012 will need a firmware upgrade to make them compatible with the SM150.]
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 this permits superior contact for more accurate measurements.Substrate calibrationsThe SM150 Sensor includes substrate calibrations for perlite, coir, peat, and mineral wool, as well as soils - providing a simple, rugged solution to checking the uniformity of growing conditions across many types of growing media.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
Data loggingThe SM150 is compatible with all Delta-T Devices Data Loggers and its 0 to 1V DC output can be handled by most other types of data logger.
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3.0% (± 0.03m3.m-3)
Full accuracy over 0 to 70%
Measures full range up to 100% with reducedaccuracy
100 to 1000mS.m-1
Salinity errors < 5% from 0 to 60%
Full accuracy over 0 to 60°C
Moisture content readings in frozen soil are notmeaningful
0 to 1.5V differential
Corresponding to ~ 0 to 100% nominal
~55 x 70mm diameter
Sample volume extends to ~1 litre, but is weighted towards soil immediately surrounding the rods
5 to 14V, ~18mA for 1s
-20 to +60°C operating range
143 x 40mm diameter
Sensors are fully interchangeable
Individual sensor calibrations not required
Logger / Meter compatibility
GP1, DL6, DL2e, HH150 and HH2
 Accuracy figures are quoted at an expanded uncertainty coverage level of k=2 (95% confidence levels).
 Accuracy at sample conductivity 220mS.m-1, additional salinity errors as stated above.
 Maximum cable lengths: 100m for GP1, DL6 and DL2e data loggers.
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