Hydraulic Conductivity Meter
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| Brand | Delta-T |
|---|---|
| Origin | United Kingdom |
| Model | SM150T |
| Measurement Principle | Frequency Domain Reflectometry (FDR) |
| Soil Moisture Range | 0–0.7 m³·m⁻³ (standard), extendable to 0–1.0 m³·m⁻³ |
| Soil Moisture Accuracy | ±0.03 m³·m⁻³ (±3% vol.) |
| Soil Temperature Range | −20 to +60 °C |
| Temp. Accuracy | ±0.5 °C (0–40 °C), ±0.75 °C (−20 to +60 °C) |
| Electrical Conductivity Tolerance | 50–500 mS·m⁻¹ |
| EC-Induced Error | < ±0.035 m³·m⁻³ (for θ = 0.05–0.4 m³·m⁻³) |
| Output Signal | 0–1.0 V analog |
| Power Supply | 5–14 VDC, 18 mA @ 1 s sampling interval |
| IP Rating | IP68 |
| Operating Temperature | −40 to +70 °C |
| Sensing Volume | Ø70 mm × 55 mm cylinder |
| Probe Dimensions | 51 mm × Ø2.5 mm |
| Mass | 0.1 kg |
| Compatible Loggers | Delta-T GP1, GP2, DL2e, DL6 |
| Brand | Dynamax |
|---|---|
| Origin | USA |
| Model | HCFM-XP Gen3 |
| Measurement Diameter Range | 1–36 mm |
| Flow Rate Range | 0.01–350 g/h (5 selectable ranges) |
| Hydraulic Conductance Range | 7.7×10⁻⁸ to 3.5×10⁻⁴ kg·s⁻¹·MPa⁻¹ |
| Pressure Output Resolution | 0.1 kPa |
| Max Operating Pressure | 620 kPa |
| Deaerated Water Reservoir Capacity | 0.7 L |
| Compressed Gas Cylinder Capacity | 170 L (at STP), CGA-580 valve |
| Data Acquisition | 1 reading per 2 s |
| A/D Conversion | 24-bit dual analog/digital |
| Dimensions (L×W×H) | 61×48×23 cm |
| Weight | 15 kg |
| Power & Interface | USB-powered, integrated data logging |
| Brand | Top Cloud-agri |
|---|---|
| Origin | Zhejiang, China |
| Manufacturer Type | OEM Manufacturer |
| Country of Origin | China |
| Model | TP-PW-II |
| Measurement Range | 0–3.5 MPa |
| Display | LCD with Chinese menu interface |
| Resolution | 0.01 MPa |
| Units | MPa and bar selectable |
| Data Storage | 4,000 records |
| Power Supply | 12 V / 2.5 Ah rechargeable lithium battery with real-time clock |
| Dimensions (Case 1) | 560 × 400 × 280 mm |
| Dimensions (Case 2) | 630 × 400 × 310 mm |
| Data Export | USB interface for PC transfer |
| Operating Environment | Field-deployable, indoor/outdoor use |
| Brand | Top Cloud-agri |
|---|---|
| Origin | Zhejiang, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | TPW-A |
| Pricing | Available Upon Request |
| Measurement Range | 0–60 °C |
| Response Time | <3 s |
| Resolution | 0.1 °C |
| Accuracy | ±0.5 °C |
| Linearity Error | ≤1% full scale |
| Data Storage | Removable SD card |
| Power Supply | 4 × AAA batteries (operational life ≥6 months) |
| Display | Backlit LCD with Chinese interface |
| Auto Power-Down | Yes (after inactivity) |
| Brand | Bronkhorst |
|---|---|
| Origin | France |
| Model | XYL’EM-Plus |
| Flow Measurement Principle | Thermal Mass Flow Sensing |
| Flow Range | 0.5–100 g/h H₂O (standard internal sensor: 50 g/h) |
| Flow Accuracy | ±1% of full scale |
| Low-Pressure Range | 1–10 kPa (water column, max 10 kPa) |
| Low-Pressure Accuracy | ±0.2 kPa |
| High-Pressure Range | 0–10 bar |
| High-Pressure Accuracy | ±1% of full scale |
| Temperature Range | 0–50 °C (Pt100 probe) |
| Temperature Accuracy | ±0.2 °C |
| High-Pressure Reservoir Capacity | 0.7 L |
| Max Reservoir Pressure | 3 bar (safety valve rated to 5 bar) |
| Low-Pressure Reservoir Capacity | 100 mL |
| Max Low-Pressure Head | 1 m H₂O |
| Filtration | 0.45 µm |
| Enclosure Rating | IP65 |
| Dimensions (W×D×H) | 461 × 347 × 206 mm |
| Weight | 10 kg (dry) |
| Power Supply | 12 VDC, 900 mA |
| Data Acquisition | 15-bit ADC |
| Communication Interface | RS232 |
| Software | XYL’EM v3.x (DOS/Windows-compatible), supports real-time data logging, embolism factor calculation, and hydraulic conductivity normalization |