Description
Providing 50% better accuracy than other HOBO Water Level Loggers (based on 0-13 feet range), this version is ideal for monitoring water levels and temperatures in wells, streams, lakes and freshwater wetlands. Like other HOBO Water Level Loggers, the 4m/13-foot version offers exceptional value and ease-of-use, with no cumbersome vent tubes or desiccants to maintain.
IMPORTANT: The Hobo software and base unit need to be purchased with this logger. Please order via the recommended products area below.
Features
- 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
Specifications
Pressure Sensor
-
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°C to 40°C
- Burst pressure: 310 kPa (45 psia) or 18 m (60 ft) depth
- Water level accuracy*: Typical error - 0.075% FS, 0.3 cm (0.01 ft) water
- Maximum error: - 0.15% FS, 0.6 cm (0.02 ft) water
- 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
- 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.
Technical
U20 Series Water Level Data Loggers
Applications
Include:
- Agricultural research
- Climate studies
- Irrigation management
- Waterways management
- Storm water impact
- Wetlands restoration
- Environmental impact