The U20L is a low-cost, research-grade water level data logger for continuously measuring water level and temperature in a wide range of underwater environments including streams, lakes,wetlands, tidal areas, and groundwater. 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. The logger features a ceramic pressure sensor, durable housing, and a protective end cap for deployment in existing wells or stilling wells. Without cumbersome vent tubes or desiccants to maintain, this easy-to-use logger is an ideal solution for water level studies and research. When combined with HOBOware Pro software, the system provides easy conversion to accurate water level readings, fully compensated for barometric pressure, temperature, and water density.
Pressure and Water Level Measurements Range (resolution): 0 to 4m (0.14cm), 0 to 9m (0.21cm), 0 to 30.6m (0.41cm) Water Level Accuracy: Typical error: ±0.1% FS, Maximum error: ±0.2% FS Raw Pressure Accuracy: ±0.3% FS Pressure Response Time (90%): <1 second; measurement accuracy also depends on temperature response time Temperature Range: -20° to 50°C Accuracy: ±0.44°C Resolution: 0.10°C at 25°C Response Time (90%): 10 minutes in water (typical) Stability (Drift): 0.1°C per year Logger Real-time Clock: ± 1 minute per month Battery: 2/3 AA, 3.6 Volt lithium, factory-replaceable Battery Life: 5 years with 1 minute or greater logging interval Memory (Non-volatile): 64K Weight: 154g Dimensions: 3.18 cm diameter, 15.24 cm length; 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 Launch Modes: Immediate and delayed start Offload Modes: Offload while logging; stop and offload
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