Pressure and Water Level Measurements U20-001-04 and U20-001-04-Ti |
Operation Range | 0 to 145 kPa (0 to 21 psia); approximately 0 to 4 m (0 to 13 ft) of water depth at sea level, or 0 to 7 m (0 to 23 ft) of water at 3,000 m (10,000 ft) of altitude |
Factory Calibrated Range | 69 to 145 kPa (10 to 21 psia), 0° to 40°C (32° to 104°F) |
Burst Pressure | 310 kPa (45 psia) or 18 m (60 ft) depth |
Water Level Accuracy* | Typical error: ±0.075% FS, 0.3 cm (0.01 ft) water Maximum error: ±0.15% FS, 0.6 cm (0.02 ft) water |
Raw Pressure Accuracy** | ±0.3% FS, 0.43 kPa (0.063 psi) maximum error |
Resolution | <0.014 kPa (0.002 psi), 0.14 cm (0.005 ft) water |
Pressure Response Time (90%)*** | <1 second; measurement accuracy also depends on temperature response time |
Temperature Measurements (All Models) |
Operation Range | -20° to 50°C (-4° to 122°F) |
Accuracy | ±0.44°C from 0° to 50°C (±0.79°F from 32° to 122°F), see Plot A in manual |
Resolution | 0.10°C at 25°C (0.18°F at 77°F), see Plot A in manual |
Response Time (90%) | 5 minutes in water (typical) |
Stability (Drift) | 0.1°C (0.18°F) per year |
Logger |
Real-time Clock | ± 1 minute per month 0° to 50°C (32° to 122°F) |
Battery | 2/3 AA, 3.6 Volt lithium, factory-replaceable |
Battery Life (Typical Use) | 5 years with 1 minute or greater logging interval |
Memory (Non-volatile) | 64K bytes memory (approx. 21,700 pressure and temperature samples) |
Weight | Stainless steel models: approximately 210 g (7.4 oz) Titanium models: approximately 140 g (4.8 oz) |
Dimensions | 2.46 cm (0.97 inches) diameter, 15 cm (5.9 inches) length; mounting hole 6.3 mm (0.25 inches) diameter |
Wetted Materials | 316 stainless steel, Viton® o-rings, acetyl cap, ceramic sensor |
Logging Interval | Fixed-rate or multiple logging intervals, with up to 8 user-defined logging intervals and durations; logging intervals from 1 second to 18 hours. Refer to the HOBOware software manual. |
Launch Modes | Immediate start and delayed start |
Offload Modes | Offload while logging; stop and offload |
Battery Indication | Battery voltage can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile. |
Environmental Rating | IP68 |