HOBO 100-Foot Depth Fresh Water Level Data Logger

HOBO 100-Foot Depth Fresh Water Level Data Logger is ideal for recording water levels and temperatures in shallow wells, streams, lakes and freshwater wetlands.

  • Product Name:100-Foot Depth Fresh Water Level Data Logger
  • Item No.:U20-001-02
  • Manufacturers:ONSET
  • Country of Origin:USA

Overview

The HOBO Water Level data logger features high accuracy at a great price and ease-of-use, with no cumbersome vent tubes or desiccants to maintain. This data logger is ideal for recording water levels and temperatures in shallow wells, streams, lakes and freshwater wetlands.


Highlighted Features

  • Lightning protection - no long signal wires, and electronics are shielded in stainless steel housing for use in freshwater (see the Water Level logger sensor location drawing)

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

  • Multiple-rate sampling (see demo) allows faster sampling at critical times such as when pumping starts or stops.

  • Available in 4 depth ranges

  • Ideal for use in wells, streams, lakes, wetlands and tidal areas

  • No-vent-tube design for easy reliable deployment

  • Available in stainless and titanium versions

  • Durable ceramic pressure sensor

  • 3-point NIST-traceable calibration certificate included


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 U20-001-02 data logger supports the following measurements: Absolute Pressure, Barometric Pressure, Temperature and Water Level


Pressure and Water Level Measurements U20-001-02 and U20-001-02-Ti

Operation Range:0 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 Range:69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F)

Burst Pressure:500 kPa (72.5 psia) or 40.8 m (134 ft) depth

Water Level Accuracy*:

Typical error: ±0.05% FS, 1.5 cm (0.05 ft) water

Maximum error: ±0.1% FS, 3 cm (0.1 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; measurement accuracy also depends on temperature response time


Temperature Measurements (All Models)

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%):5 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:

Stainless steel models: approximately 210 g (7.4 oz)

Titanium models: approximately 140 g (4.8 oz)

Dimensions:2.46 cm (0.97 inches) diameter, 15 cm (5.9 inches) length; mounting hole 6.3 mm (0.25 inches) diameter

Wetted Materials:316 stainless steel, Viton® o-rings, acetyl cap, ceramic sensor

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. Refer to the HOBOware software manual.

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


* Water Level Accuracy: With accurate reference water level measurement, known water density, accurate Barometric Compensation Assistant data, and a stable temperature environment.

** Raw Pressure Accuracy: Absolute pressure sensor accuracy includes all sensor drift, temperature, and hysteresis-induced errors.

*** Changes in Temperature: Allow 10 minutes in water to achieve full temperature compensation of the pressure sensor. Maximum error due to rapid thermal changes is approximately 0.5%.