U20-001-03 Water Level/Temperature Data Logger (76.5m/250ft)

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.

IMPORTANT: The Hobo software and base unit need to be purchased with this logger. Please order via the recommendated products area below.

• Lightning protection - no long signal wires, and electronics are shielded in stainless steel 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 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

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°C to 40°C
• 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
• Accuracy: 0.37°C at 20°C 
• Resolution: 0.1°C at 20°C  (10-bit)
• Response time (90%): 3.5 minutes in water (typical)
• Stability (drift): 0.1°C per year

Logger

• Real-time clock: ± 1 minute per month 0° to 50°C 
• 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  diameter, 15 cm  length; mounting hole 6.3 mm diameter
• Weight: Approximately 210 g 
• 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.

U20 Series Water Level Data Loggers

Include:

• Agricultural research
• Climate studies
• Irrigation management
• Waterways management
• Storm water impact
• Wetlands restoration
• Environmental impact