| | Soil Moisture The following sensors are shown below. More sensors may be available for measuring this parameter that may better suit alternative requirements. Please contact us for more information on alternative options.  High accuracy ±1%Sturdy designQuick Response time 
| Medium accuracy ±3%Small form factor for use in pots and to minimize soil disturbance 
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ML2 ThetaProbe Overview This tried and tested probe measures volumetric soil water content to within 1% in contrast with TDR based techniques, the ML2 is simpler to connect and log, easier to calibrate for specific soils and can be used in saline soils. ThetaProbes can be pushed into the soil surface or buried at any depth. The output can either be logged (the ML2 is compatible with most types of loggers) or displayed on the ThetaMeter readout unit. Features ► Low Maintenance ► Durable ► Frost resistant ► Low cost ► Quick Response time ► Accurate ► Easy data logging 
Installation ThetaProbes are robust, buriable and maintenance free. They can be placed in the soil by inserting them into augered holes or alternatively by positioning them in the wall of a trench (which is then carefully backfilled). Optional Extension Tubes assist convenient placement and removal when burying at depth. Access holes should be angled to minimise water "tracking". 
Specifications Measurement | Specification Range | Accuracy | ±1% soil moisture (±0. 01m3.m-3), after soil-specific calibration | Input supply volts | 5-15VDC | Input Current | 19mA | Output | 0-1VDC for 0-0.5m3.m-3 (non linear) | Measuring rods | 3 (Rod pattern identical to the ML1.) | Rod length | 60mm | Overall length | 207mm including pins. | Environmental | Can be buried to any depth, not damaged by frost. | Extension tube (optional) | For convenient placement and removal when burying ThetaProbes. Choice of 50cm or 100cm ( can be joined) | Patents | UK patent 2300485B,
US patent 5804976.
Patent applied for: EUR 96303190.1 |
 SM200
Overview The SM200 soil moisture sensor has research grade performance and gives reliable readings in all soil types, being designed for easy insertion and installation at both the soil surface and at depth. This market leading sensor offers outstanding performance in saline soil conditions and in extreme temperatures. For a sensor of this build quality and specification the SM200 is extremely competitively priced. Features ► Scientific accuracy ±3% ► Excellent temperature stability ► Can be used in saline soils ► Minimal soil disturbance ► Low cost logging solution available ► Flexible cabling solutions ► Easy installation at depth ► Can be used in plant pots Performance Only the highest grade materials have been used in the manufacture the SM200 resulting in a soil moisture sensor of the highest quality. By means of novel design and manufacturing practice this quality has been achieve at no cost penalty to customers. You can buy an SM200 with the confidence that it is supported by Delta-T’s 15 years experience of producing world renowned, research grade soil moisture sensors. Delta-T sensors are reliable and field-proven, and are in regular use in some of the world’s harshest environments.   
Specifications Measurement | Specification Range | Accuracy | ± 3 %vol over 0 to 50 %vol | Error | ± 3.5 %vol over 0 to 40 %vol, over 50 to 500 mS.m-1 (0.5 to 5 dS.m-1) | Input Volts | 5 to 14V | Input Current | 15mA typical (1 second warm-up recommended, 200ms minimum ) | Output | 0-1VDC for 0-60%vol | Measuring rods | 2 | Dimensions | 5mm x 70mm dia. | Sensing volume | approximately 55mm x 70mm diameter | Sealing | IP68 Sensor buriable, sealed to IP68 | Operating range | -20 to +60°C - Readings in frozen soil are not meaningful |
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