U20L HOBO Water Level Data Logger

Overview

A low-cost, research-grade data logger for continuous monitoring of water level and temperature at depths of up to 13, 30, or 100 feet in a wide range of underwater environments. This logger features 0.1% measurement accuracy, a polypropylene housing for use in both freshwater and saltwater, and a non-vented design for convenient and hassle-free deployment.

Features

Self-contained, non-vented design enables easy deployment

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

Depths up to 13, 30, or 100 feet depending on model

Durable ceramic pressure sensor withstands freezing

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

Note: A calibration certificate is not offered for this logger. If you require a NIST-traceable calibration certificate, please see the U20-001-01 (freshwater) or U20-001-01-Ti (saltwater).

Specifications

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, 0° to 40°C

10 to 30 psia, 32° to 104°F

Burst Pressure

310 kPa or 18 m depth

45 psia or 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 water

0.007 ft water

Pressure Response Time (90%)***

<1 second at a stable temperature; measurement accuracy also depends on temperature response time

Pressure (Absolute) and Water Level Measurements U20L-02

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: ±0.1% 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

Pressure (Absolute) and Water Level Measurements U20L-04

Operation Range

0 to 145 kPa (0 to 21 psia); approximately 0 to 4 m (0 to 13 ft) of water depth at sea level, or 0 to 7 m (0 to 23 ft) of water at 3,000 m (10,000 ft) of altitude

Factory Calibrated Range

69 to 145 kPa (10 to 21 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, 0.4 cm (0.013 ft) water

Maximum error: ±0.2% FS, 0.8 cm (0.026 ft) water

Raw Pressure Accuracy**

±0.3% FS, 0.43 kPa (0.063 psi) maximum error

Resolution

<0.014 kPa (0.002 psi), 0.14 cm (0.005 ft) water

Pressure Response Time (90%)***

<1 second at a stable temperature; 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 , see manual for plot

±0.79°F from 32° to 122°F , see manual for plot

Resolution

0.10°C at 25°C , see manual for plot

0.18°F at 77°F , see manual for plot

Response Time (90%)

10 minutes in water (typical)

Stability (Drift)

0.1°C per year

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 acetal 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. Refer to the HOBOware User’s Guide for details.

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 Compliance Mark

What's In The Box

HOBO U20L-0x Water Level Data Logger