Hobo U20L Water Level Logger

 

U20 Polypropylene 480x180

 

 

Features

  • Ideal for use in wells, streams, lakes, wetlands and tidal areas
  • Available in 3 depth ranges, 4m, 9m, and 30m
  • Self-contained non-vented design enables easy deployment
  • Durable ceramic pressure sensor for reliable performance 
  • Multiple-rate sampling allows faster sampling at critical times

Overview

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.

Technical

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

Documents