Onset U20-001-03 HOBO 250-Foot Depth Water Level Data Logger (0~850 kPa; -20°~50°C)

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

Temperature Sensor:

  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%): 5 minutes in water (typical)

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

  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)

Delivery scope: HOBO U20-001-03 Water Level Data Logger (250-foot depth)