Monitor water levels and temperatures in wells, streams, lakes and wetlands (freshwater) with this 13-foot HOBO Water Level Data Logger. With its narrow range this logger provides the best accuracy in shallow waters. This logger offers a great value and easy deployment since there are no cumbersome vent tubes or desiccants to maintain. For saltwater deployments, such as brackish wetlands and tidal areas, see HOBO U20 Water Level Titanium.
Helpful Links:
Sensor location drawing
Barometric Pressure Compensation Assistant Demo
Multi-rate Sampling Demo
This data logger operates in outdoor and underwater environments.
The U20-001-04 data logger supports the following measurements: Absolute Pressure, Barometric Pressure, Temperature and Water Level
| 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 |
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