| ECH2O Sensors Comparison Table | ||||||
|---|---|---|---|---|---|---|
| TYPE | EC-5 | 10HS | EC-TM | 5TE | MAS-1 | |
| LENGTH | 5 cm | 10 cm | 5 cm | 5.2 cm | 8.9 cm | |
| MEASURES | Volumetric Water Content (VWC) |
VWC | VWC temperature |
VWC Temperature Electrical conductivity |
VWC | |
| ACCURACY |
±3% typical on all soils, up to 8dS/m. ±1-2% with soil-specific calibration. |
±3% up to 10dS/m, ±2% w/ soil-specific calibration in any soil. |
MINERAL SOIL: ±3% up to 8dS/m, ±1-2% w/ soil-specific calibration. ROCKWOOL: ±3%, 0.5-8dS/m. POTTINGSOIL: ±3%, 3-14dS/m. |
±3% VWC up to 10dS/m, ±1-2% in any porous medium ±10% from 0 to 7 dS/m ±1 °C |
±4% VWC with factory calibration in a typical mineral soil ±1-2% VWC with medium-specific calibration in most porous medium |
|
| RANGE | 0-100% VWC | 0-57%VWC |
0-100% VWC -40 to 50 °C |
0-80% VWC 0 to 23 dS/m (bulk) -40 to 50 °C |
0-50% VWC typical | |
| ELECTRICAL INTERFACE | 3.5mm plug 3-wire |
3.5mm plug 3-wire |
3.5mm plug 3-wire |
3.5mm plug 3-wire |
2-wire analog 4-20mA |
|
| SUPPLY VOLTAGE | 2.5-5 VDC @ 10mA | 3VDC @ 12mA to 15 VDC @ 15 mA | 3-16 VDC, 0.3mA quiescent, 10mA for 9ms measurement | 3.6-15 VDC, 0.3mA quiescent, 10mA | 7-32 VDC continuous | |
| Measurement Time | 10 ms | 10 ms | 10 ms | 150 ms | 10 ms | |
| FREQUENCY | 70 MHz | 70 MHz | 70 MHz | 70 MHz | 70 MHz | |
| OUTPUT | Voltage, correlated linearly (soil) or polynomially (growing media) with VWC | 300 – 1250 mV, independent of excitation voltage | Serial 3V TTL, 8bit, 1-stop bit, no parity. | Serial 3V TTL, 8bit, 1-stop bit, no parity. | 4 mAmp = 0 VSW% and 20mAmp = 100 VSW% | |
| Cable Length (custom lengths and ends available) |
3m | 5m | 3m | 5m | 2m standard. Lengths greater than 200 m possible because of current output. | |
| Common Specifications | ||||||
| Resolution | 0.002m3/m3 typical with Em50 and Em5b loggers; other loggers may vary | |||||
| Operating Environment | -40 to 60°C, 0 to 100% RH | |||||