HOBO 250-Foot Depth Water Level Data Logger
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Overview
Featuring 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 level and temperature up to 250-ft depths in shallow wells, streams, lakes, freshwater wetlands (stainless-steel), saltwater/brackish wetlands and tidal areas (titanium).
Features
- Lightning protection - no long signal wires, and electronics are shielded in a metal housing
- HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure, temperature, and water density
- Multiple-rate sampling allows faster sampling at critical times such as when pumping starts or stops
- Available in four 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
Specifications
Pressure and Water Level Measurements U20-001-03 and U20-001-03-Ti
Operation Range
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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
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69 to 850 kPa (10 to 123.3 psia), 0° to 40°C (32° to 104°F)
Burst Pressure
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1200 kPa (174 psia) or 112 m (368 ft) depth
Water Level Accuracy*
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Typical error: ±0.05% FS, 3.8 cm (0.125 ft) waterMaximum error: ±0.1% FS, 7.6 cm (0.25 ft) water
Raw Pressure Accuracy**
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±0.3% FS, 2.55 kPa (0.37 psi) maximum error
Resolution
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<0.085 kPa (0.012 psi), 0.87 cm (0.028 ft) water
Pressure Response Time (90%)***
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<1 second; measurement accuracy also depends on temperature response time
Temperature Measurements (All Models)
Operation Range
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-20° to 50°C-4° to 122°F
Accuracy
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±0.44°C from 0° to 50°C (±0.79°F from 32° to 122°F), see Plot A in manual
Resolution
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0.10°C at 25°C (0.18°F at 77°F), see Plot A in manual
Response Time (90%)
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5 minutes in water (typical)
Stability (Drift)
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0.1°C (0.18°F) per year
Logger
Real-time Clock
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± 1 minute per month 0° to 50°C32° to 122°F
Battery
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2/3 AA, 3.6 Volt lithium, factory-replaceable
Battery Life (Typical Use)
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5 years with 1 minute or greater logging interval
Memory (Non-volatile)
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64K bytes memory (approx. 21,700 pressure and temperature samples)
Weight
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Stainless steel models: approximately 210 g (7.4 oz)Titanium models: approximately 140 g (4.8 oz)
Dimensions
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2.46 cm (0.97 inches) diameter, 15 cm (5.9 inches) length; mounting hole 6.3 mm (0.25 inches) diameter
Wetted Materials
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316 stainless steel, Viton® o-rings, acetyl cap, ceramic sensor
Logging Interval
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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
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Immediate start and delayed start
Offload Modes
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Offload while logging; stop and offload
Battery Indication
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Battery voltage can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile.
Environmental Rating
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IP68
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* 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%.
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