Part Numbers

U20L-04U20L-01U20L-02

HOBO Water Level Data Logger

$375.00 USD
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; for use in freshwater or saltwater.

Important Information

Requires HOBOware Pro software and either a U-DTW-1 Waterproof Shuttle or the Base-U-4 Optic USB Base Station for configuration and data offload. Please see compatible items below.

 

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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.

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U20L optical interface illustration

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
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CE Compliance Mark

Compatible items

Carrying Case

U20-CASE-1
$47.00 USD

Data Offload - Base Stations - Shuttles - Couplers

Protective Enclosures

HOUSING-U2X
$57.00 USD

Stainless Steel Cable/Crimps

CABLE-1-300
$485.00 USD
CABLE-1-50
$105.00 USD
CABLE-1-CRIMP
$44.00 USD

Well Caps

WELL-CAP-01
$65.00 USD

Compliance Certificates

COMPLIANCE CERT
$30.00 USD

Data Offload - Base Stations - Shuttles - Couplers

BASE-U-4
$175.00 USD
U-DTW-1
$325.00 USD

Graphing & Analysis

BHW-PRO-DLD
$75.00 USD
BHW-PRO-USB
$99.00 USD

What's in the box

  • HOBO U20L-0x Water Level Data Logger

Documents

HOBO U20L Water Level Logger (U20L-0x) User's Manual

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HOBO U20L Water Level Logger (U20L-0x) Quick Start Guide

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