HOBO Water Level (30 ft) Data Logger

OverviewThe HOBO U20L-01 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% measu

  • Product Name:HOBO Water Level (30 ft) Data Logger
  • Item No.:HOBO U20L-01
  • Manufacturers:Onset
  • Country of Origin:US

Overview

The HOBO U20L-01 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% measurement 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 30 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-01 data logger supports the following measurements: Absolute Pressure, Barometric Pressure, Temperature and Water Level


Pressure (Absolute) and Water Level Measurements U20L-01

Operation Range

0 to 207 kPa (0 to 30 psia); approximately 0 to 9 m (0 to 30 ft) of water depth at sea level, or 0 to 12 m (0 to 40 ft) of water at 3,000 m (10,000 ft) of altitude

Factory Calibrated Range

69 to 207 kPa (10 to 30 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, 1.0 cm (0.03 ft) water
Maximum error: ±0.2% FS, 2.0 cm (0.06 ft) water

Raw Pressure Accuracy**

±0.3% FS, 0.62 kPa (0.09 psi) maximum error

Resolution

<0.02 kPa (0.003 psi), 0.21 cm (0.007 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

Resolution

0.10°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)

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)

Weight

Approximately 154 g (5.43 oz) in air Approximately 53.9 g (1.9 oz) in fresh water

Dimensions

3.18 cm (1.25 inches) diameter, 15.24 cm (6.0 inches) length; mounting hole 6.3 mm (0.25 inches) diameter

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

CE

The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).