NAS-3-X
The NAS-3X is the latest version of the leading in-situ nutrient analyzer for high-frequency time-series determination of nutrient concentrations in marine and fresh waters. Four versions are available for the measurement of nitrate phosphate, silicate and ammonia.
The NAS-3X is typically deployed unattended for periods of 1 to 3 months, although much longer deployments can be achieved. The NAS-3X has also been used near surface in many buoy and riverine applications or moored at depths down to 250m.
Manufacturer
EnviroTech Instruments LLC
1517 Technology Dr
Chesapeake, VA 23320
USA
+1 (757) 549-8474
+1 (757) 410-2382
Technical specifications
| Depth rating | 250 m. |
| Max. pressure | |
| Housing material | uPVC & polypropylene |
| Power supply | 12 volt DC (range 9.5 - 15.0 volts) |
| Power consumption | Analysis: 285 mA / Sleep: 0.15 mA / Mean: 19 mA (for 8 weeks) |
| Weight | Air: 31 lbs (14 kg) - Water: 12 lbs (5.5kg) Depth capability 100 m standard - 250 m optional - Deeper on |
| Size | 9.6” (246 mm) diameter x 31.4” (799 mm) |
| Range | µMol: Nitrate(0-10, 30, 60, 120,300); Silicate (0-10, 60); Phosphate (0-1, 3, 6); Ammonium (0-10, 0-50, 0-100) |
| Resolution | (% range) Nitrate(2%); Silicate (3%); Phosphate (3%); Ammonium (1%) |
| Accuracy | ((µMol) Nitrate(0.05); Silicate (0.06); Phosphate (0.06); Ammonium (0.05) |
| Sample rate | |
| Data interface | RS232 - ASCII - 19,200 baud (N81) / 300 baud - 115.2 kbaud |
| Calibration | RS232 - ASCII - 19,200 baud (N81) / 300 baud - 115.2 kbaud |