Delta-T Devices
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| Brand | Delta-T Devices |
|---|---|
| Origin | United Kingdom |
| Model | AP4 |
| Measurement Principle | Steady-state diffusion-based porometry |
| Weight | 3.0 kg (main unit), 130 g (sensor head) |
| Operating Time | Up to 20 h on internal rechargeable battery |
| Data Storage | 1500 readings |
| Interface | RS232 (9600 baud) |
| Compliance | Designed for GLP-aligned field and lab use |
| Software | Windows-compatible CSV export utility |
| Brand | Delta-T Devices |
|---|---|
| Origin | United Kingdom |
| Model | PR2-4 |
| Measurement Principle | Frequency Domain Reflectometry (FDR) |
| Probe Depths | 10, 20, 30, and 40 cm |
| Output | Four analog voltage signals (0–1 V corresponding to 0–60 % vol) |
| Volumetric Water Content Range | 0–100 % vol (optimal accuracy: 0–40 % vol) |
| Accuracy | ±4 % vol (0–+40 °C, soil-specific calibration) or ±6 % vol (0–+40 °C, generic calibration) |
| Salinity Tolerance | 50–400 mS/m (pore water electrical conductivity) |
| Sensor Sensitivity Volume | Cylindrical zone of 10 cm diameter × 5 cm height (95 % contribution to reading) |
| Operating Temperature | –20 to +70 °C (optimal accuracy: 0–+40 °C) |
| IP Rating | IP67 (probe), IP52 (HH2 meter) |
| Power Supply | 5.5–15 V DC |
| Current Draw | <80 mA |
| Response Time | 1 s |
| Cable | Shielded 9-conductor, standard 1.5 m with M12 IP68 connector |
| Probe Material | Polycarbonate housing with stainless steel tip |
| Probe Dimensions | 750 mm length × 25.4 mm diameter |
| Probe Weight | 0.6 kg |
| HH2 Meter Display | 16×2 character LCD |
| HH2 Memory Capacity | 166–782 readings |
| HH2 Battery Life | ~4500 measurements on one 9 V alkaline cell |
| EMC Compliance | Meets EU EMC Directive 2014/30/EU |