HOBO Water Level (100 ft) Data Logger

OverviewThe HOBO U20L-02 is a low-cost, research-grade water level data logger for continuously measuring water level and temperature in a wide range of underwater environments. It features 0.1% accur

  • Product Name:HOBO Water Level (100 ft) Data Logger
  • Item No.:HOBO U20L-02
  • Manufacturers:Onset
  • Country of Origin:US

Overview

The HOBO U20L-02 is a low-cost, research-grade water level data logger for continuously measuring water level and temperature in a wide range of underwater environments. It features 0.1% accuracy, a polypropylene housing for use in both fresh and salt water, and a non-vented design for convenient and hassle-free deployment.

Highlighted Features

  • Self-contained non-vented design enables easy deployment

  • Ideal for use in both fresh and saltwater environments, including wells, streams, lakes, wetlands, and tidal areas

  • Depths up to 100 feet

  • Durable ceramic pressure sensor withstands freezing

  • HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure (see demo), temperature, and water density

In what environment does this data logger operate?

This data logger operates in outdoor and underwater environments.

What measurements does this data logger support?

The U20L-02 data logger supports the following measurements: Absolute Pressure, Barometric Pressure, Temperature and Water Level


Pressure (Absolute) and Water Level Measurements U20L-02
Operation Range0 to 400 kPa (0 to 58 psia); approximately 0 to 30.6 m (0 to 100 ft) of water depth at sea level, or 0 to 33.6 m (0 to 111 ft) of water at
3,000 m (10,000 ft) of altitude
Factory Calibrated Range69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F)
Burst Pressure500 kPa (72.5 psia) or 40.8 m (134 ft) depth
Water Level Accuracy*Typical error: ±0.1% FS, 3.0 cm (0.1 ft) water
Maximum error: ±0.2% FS, 6.0 cm (0.2 ft) water
Raw Pressure Accuracy**±0.3% FS, 1.20 kPa (0.17 psi) maximum error
Resolution<0.04 kPa (0.006 psi), 0.41 cm (0.013 ft) water
Pressure Response Time (90%)***<1 second at a 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), see Plot A in manual
Resolution0.10°C at 25°C (0.18°F at 77°F), see Plot A in manual
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)
Battery2/3 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)
WeightApproximately 154 g (5.43 oz) in air Approximately 53.9 g (1.9 oz) in fresh water
Dimensions3.18 cm (1.25 inches) diameter, 15.24 cm (6.0 inches) length; mounting hole 6.3 mm (0.25 inches) diameter
Wetted MaterialsPolypropylene housing and lanyard; Viton and Buna-N O-rings; ceramic sensor in acetyl end cap; stainless steel screws suitable for saltwater
Logging IntervalFixed-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 the HOBOware User’s Guide for details.
Launch ModesImmediate start and delayed start
Offload ModesOffload while logging; stop and offload
Battery IndicationBattery voltage can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile.
Environmental RatingIP68
CE CompliantThe CE Marking identifies this product as complying with all relevant directives in the European Union (EU).