Onset HOBO - Model U20-001-03 -250-Foot Depth Water Level Data Logger
The HOBO water level data logger features high accuracy at a great price and ease-of-use, with no cumbersome vent tubes or desiccants to maintain. This data logger is ideal for recording water levels and temperatures in shallow wells, streams, lakes and freshwater wetlands.
- Lightning protection - no long signal wires, and electronics are shielded in stainless steel housing for use in freshwater (see the Water Level logger sensor location drawing)
- HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure (see more) temperature, and water density.
- Multiple-rate sampling allows faster sampling at critical times such as when pumping starts or stops.
- Available in 4 depth ranges
- Ideal for use in wells, streams, lakes, wetlands and tidal areas
- No-vent-tube design for easy reliable deployment
- Available in stainless and titanium versions
- Durable ceramic pressure sensor
- 3-point NIST-traceable calibration certificate included
Environment:
The U20-001-03 Data Logger is for use in Outdoor and Underwater environments
Measurements:
The U20-001-03 Data Logger supports the following measurements: Temperature, Barometric Pressure, Water Level.
Pressure and Water Level Measurements U20-001-03 and U20-001-03-Ti
- Operation Range: 0 to 850 kPa (0 to 123.3 psia); approximately 0 to 76.5 m (0 to 251 ft) of water depth at sea level, or 0 to 79.5 m (0 to 262 ft) of water at 3,000 m (10,000 ft) of altitude
- Factory Calibrated Range: 69 to 850 kPa (10 to 123.3 psia), 0° to 40°C (32° to 104°F)
- Burst Pressure: 1200 kPa (174 psia) or 112 m (368 ft) depth
- Water Level Accuracy* Typical error: ±0.05% FS, 3.8 cm (0.125 ft) water
- Maximum error: ±0.1% FS, 7.6 cm (0.25 ft) water
- Raw Pressure Accuracy**: ±0.3% FS, 2.55 kPa (0.37 psi) maximum error
- Resolution: <0.085 kPa (0.012 psi), 0.87 cm (0.028 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
- Resolution: 0.10°C at 25°C (0.18°F at 77°F)
- 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.
- The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).
* Water Level Accuracy: With accurate reference water level measurement, known water density, accurate Barometric Compensation Assistant data, and a stable temperature environment.
** Raw Pressure Accuracy: Absolute pressure sensor accuracy includes all sensor drift, temperature, and hysteresis-induced errors.
*** Changes in Temperature: Allow 10 minutes in water to achieve full temperature compensation of the pressure sensor. Maximum error due to rapid thermal changes is approximately 0.5%.