Portable Delta-T kit combining the WET-2 sensor with the HH2 Moisture Meter. In less than 5 seconds it reads water content, pore water conductivity (ECp) and temperature in soils and substrates, with calibrations for soils, coir, peat mixes and mineral wool, in a carrying case.
The WET Sensor type WET-2 measures three vital soil properties: Water content, Electrical conductivity (EC) and Temperature. For portable work it is used with the HH2 Moisture Meter and is normally supplied as the complete WET-2-KIT. The sensor is easily inserted into substrates, composts and most soils, so growers and researchers can make rapid checks and optimise the uniformity of growing conditions. Each reading takes less than 5 seconds.
The WET Sensor calculates pore water conductivity (ECp) – the EC of the water available to plant roots. The calculation is valid in most soils and is particularly accurate in mineral wool and other artificial substrates. The sensor is particularly useful in horticulture for monitoring and responding to variations when applying fertigation, controlled release fertiliser (CRF) or organic treatments.
The HH2 Moisture Meter displays the three outputs of the WET Sensor and stores them until they are downloaded to a PC. Pore water and/or bulk conductivity and the permittivity can be displayed, with user-selectable temperature compensation, and user-defined custom calibrations can be entered for soils and other substrates. Delta-T Devices is an ISO 9001 certified manufacturer.
| Manufacturer | Delta-T Devices Ltd |
|---|---|
| Model | WET-2-KIT (WET-2/d WET Sensor + HH2 Moisture Meter) |
| Measured parameters | Permittivity (ε′), bulk conductivity (ECb), temperature |
| Calculated parameters | Volumetric soil moisture (θ), pore water conductivity (ECp) |
| Volumetric water content range | 0 to 100 % (full accuracy over 0 to 1.0 m3.m-3) |
| Water content accuracy | ± 0.03 m3.m-3 (± 3 %), after applying a soil-specific calibration, within 10 °C of calibration temperature |
| Permittivity | 1 to 80, ± 2.5 |
| Bulk conductivity (ECb) | 0 to 300 mS.m-1, ± 10 |
| Pore water conductivity (ECp) accuracy | Depends on water content and ECp (manufacturer's graph): typical ± 5 % of reading, max errors ± 10 % of reading or ± 10 mS.m-1 (whichever is greater); in the wider zone typical ± 10 % of reading, max errors ± 20 % of reading or ± 20 mS.m-1 (whichever is greater) |
| Salinity range | 0 to 300 mS.m-1; supplied with extended range calibrations for readings between 300 and 500 mS.m-1 |
| Temperature range | -5 to +50 °C |
| Temperature accuracy | ± 1.5 °C |
| Reading time | Less than 5 seconds |
| Sensor output | Serial TTL data |
| Sensor power requirement | 6 to 10 V, ~38 mA for 2.5 s |
| Sensor protection | IP68 |
| Sample volume | ~500 ml (weighted towards soil immediately surrounding the rods) |
| Sensor dimensions | ~120 x 45 x 13 mm |
| Rods | Outer rods 68 mm x 3.0 mm dia; central rod 65 mm x 5.0 mm dia |
| Sensor weight | 0.1 kg |
| Sensor cable | 1 m, 25-way D-socket for use with HH2 |
| Sensor calibration | Individual sensor calibrations stored within sensor EEPROM; recalibration advised every 3 years (depending on use) |
| Media calibrations (kit) | Generic mineral, organic, sand and clay soils, coir (coco fibre), peat based potting mixes, greenhouse 'mineral' soils, Stonewool artificial mineral wool substrate (vertical and horizontal measurement) |
| Readout unit | HH2 Moisture Meter, LCD 2 line x 16 character |
| Reading storage | Up to 1500 time-stamped readings (typically 500 to 1500, depends on sensor and settings) |
| PC interface | RS232; USB with the USB-RS232 adapter cable; HH2Read software, .csv format |
| Meter battery | 9 V alkaline 6LR61 (PP3), ~5,000 readings |
| Meter protection / operating temperature | IP54, 0 to 40 °C |
| Meter weight | 450 g |
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