The Onset U20L04 HOBO Water Level Data Logger (13 ft.) is suited for continuous monitoring of water level and temperature at depths of up to 13 feet in a wide range of underwater environments. The non-vented design allows for convenient deployment of the logger and the polypropylene housing allows for use within both freshwater and saltwater environments.
HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure, temperature, and water density
Pressure (Absolute) and Water Level Measurements U20L-04
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° to 40°C (32° to 104°F)
Burst Pressure: 310 kPa (45 psia) or 18 m (60 ft) depth
Water Level Accuracy: Typical error: ±0.1% FS, 0.4 cm (0.013 ft) water
Maximum error: ±0.2% FS, 0.8 cm (0.026 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 at stable temperature; measurement accuracy also depends on temperature response time
Temperature Measurements
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%): 10 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)
Wetted Materials: Polypropylene housing and lanyard; Viton and Buna-N O-rings; ceramic sensor in acetyl end cap; stainless steel screws suitable for saltwater
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
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
Environmental Rating: IP68
Environments: For use in outdoor and water environments
Measurements: Absolute Pressure, Barometric Pressure, Temperature and Water Level
The Onset U20L-04 HOBO Water Level Data Logger, 13 ft. is a research-grade water level data logger for continuously measuring water level and temperature in a wide range of underwater environments. It features 0.1% measurement accuracy, a polypropylene housing for use in both fresh and salt water, and a non-vented design for convenient and hassle-free deployment.
This data logger requires either the U-DTW-1 Waterproof Shuttle or the Base-U-4 Base Station for configuration and data offload.
Note: U20L-04 requires the HOBOware software (free to download) to operate, and either a U-DTW-1 Waterproof Shuttle or the Base-U-4 Optic USB Base Station for configuration and data offload. Please also note that a USB interface cable comes with the purchase of a HOBOware Pro CD (BHW-PRO-CD), only.
