Onset U20L-04 HOBO Water Level Data Logger (13 ft)

Pressure (Absolute) and Water Level Measurements:

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: ±0.1% FS, 0.4 cm (0.013 ft) water (Typical error); ±0.2% FS, 0.8 cm (0.026 ft) water (Maximum error)

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 at a stable temperature; measurement accuracy also depends on temperature response time

Temperature Measurements:

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)

Resolution: 0.10°C at 25°C (0.18°F at 77°F)

Response Time (90%): 10 minutes in water (typical)

Battery: 2/3 AA, 3.6 Volt lithium, factory-replaceable

Memory (Non-volatile): 64K bytes memory (approx. 21,700 pressure and temperature

samples)

Weight Approximately: 154 g (5.43 oz) in air

Approximately: 53.9 g (1.9 oz) in fresh water

Dimensions: 3.18 cm (1.25 inches) diameter, 15.24 cm (6.0 inches) length; mounting hole 6.3 mm (0.25 inches) diameter

Manual

Video