Onset HOBO - Model U20-001-01-Ti -30-Foot Depth Titanium Water Level Data Logger

• Lightning protection - no long signal wires, and electronics are shielded in a titanium housing for use in saltwater (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 demo) temperature, and water density.
• Multiple-rate sampling (see demo) allows faster sampling at critical times such as when pumping starts or stops.
• Also available in narrow depth range (U20-001-04-Ti)
• 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 U20-001-01 Data Logger is for use inOutdoor and Underwater environments

Measurements:
The U20-001-01 Data Logger supports the following measurements:  Temperature, Barometric Pressure, Water Level

Pressure and Water Level Measurements U20-001-01 and U20-001-01-Ti

• Operation Range: 0 to 207 kPa (0 to 30 psia); approximately 0 to 9 m (0 to 30 ft) of water depth at sea level, or 0 to 12 m (0 to 40 ft) of water at 3,000 m (10,000 ft) of altitude
• Factory Calibrated Range: 69 to 207 kPa (10 to 30 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: ±0.05% FS, 0.5 cm (0.015 ft) water
• Maximum error: ±0.1% FS, 1.0 cm (0.03 ft) water
• Raw Pressure Accuracy**: ±0.3% FS, 0.62 kPa (0.09 psi) maximum error
• Resolution: Pressure Response Time (90%)***:

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%.