U20-001-03

The HOBO water level logger features high accuracy at a great price and ease-of-use, with no cumbersome vent tubes or desiccants to maintain. This logger is ideal for recording water levels and temperatures in shallow wells, streams, lakes and freshwater wetlands.

View how the HOBO Water Level Logger compares to the Competition.

• Lightning protection - no long signal wires, and electronics are shielded in stainless steel housing (see the Wate Level logger sensor location drawing)
• HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure (see demo) temperature, and water density.
• Multiple-rate sampling (see demo) 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

Environment: Outdoor Underwater Measurement: Water Level Pressure, Barometric		Product ID: U20-001-03 Product Name: 250-Foot Depth Product Type: Data Loggers

Pressure Sensor
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

Thermal response time (90%)†: Approximately 10 minutes in water to achieve full temperature compensation of the pressure sensor

* With accurate reference water level measurement and Barometric Compensation Assistant data

** Absolute pressure sensor accuracy includes all pressure drift, temperature, and hysteresis-induced errors

† Maximum error due to rapid thermal changes is approximately 0.5%.

Temperature Sensor
Operation range: -20° to 50°C (-4° to 122°F)

Accuracy: 0.37°C at 20°C (0.67°F at 68°F), see Plot A

Resolution: 0.1°C at 20°C (0.18°F at 68°F) (10-bit), see Plot A

Response time (90%): 3.5 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)

Dimensions: 2.46 cm (0.97 inches) diameter, 15 cm (5.9 inches) length; mounting hole 6.3 mm (0.25 inches) diameter

Weight: Approximately 210 g (7.4 oz)

Wetted materials: 316 stainless steel, Viton® o-rings, acetyl cap, ceramic sensor

Shock/drop: Logger is sensitive to shocks. Handle with care and avoid any impact. Always use proper packaging when shipping the logger.

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 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 the relevant directives in the European Union (EU).