Onset U24 Specifications
HOBO® Conductivity Loggers
Conductivity monitoring for freshwater and stable saltwater applications
HOBO Conductivity Loggers are convenient, rugged, and
cost-effective data loggers for a variety of freshwater and
saltwater monitoring applications.
The HOBO U24-001 model provides high-accuracy
conductivity data in freshwater environments, for applications such as environmental impact monitoring, stormwater
management, and water quality studies.
The HOBO U24-002-C model is for saltwater environments with relatively small changes in salinity (±5,000 µS/cm)
such as saltwater bays, or to detect salinity events such as upwelling, rainstorm, and discharge events. This logger can
also be used to gather salinity data for salinity compensation of HOBO U26 Dissolved Oxygen logger data. Note: This
logger is not intended for monitoring salinity levels in waters with widely changing salinities as it can have significant
measurement error and drift in those environments.
Supported Measurements: Conductivity, Salinity, Temperature
Key Advantages:
• Non-contact capacitive sensor provides long life
• Easy access to sensor for cleaning and shedding air bubbles
• HOBOware Pro software provides compensation for fouling using calibration
points from the start and end of each deployment
• Optical interface provides high-speed, reliable data offload in wet environments
• Compatible with HOBO Waterproof Shuttle for easy and reliable data retrieval
Minimum System Requirements:
Software Coupler
Base Station
*
1
*HOBO Base Station or HOBO Waterproof Shuttle required.
1
Coupler included with HOBO Base Station or HOBO Waterproof Shuttle.
For complete information and accessories, please visit: www.onsetcomp.com
Part number U24-001 Conductivity U24-002-C Conductivity/Salinity
Memory
Conductivity Calibrated
Measurement Ranges
Conductivity Calibrated Range –
Temperature Range
Specic Conductance Accuracy
(in Calibrated Range using Conductivity Assistant and Calibration Measurements)
Conductivity Resolution (typical) 1 μS/cm 2 μS/cm
Conductivity Drift Less than 3% sensor drift per year
Temperature Accuracy (in Calibrated Range) 0.1°C (0.2°F)
Temperature Resolution 0.01°C (0.02°F)
Response Time 1 second to 90% of change (in water)
Measurement and Operating Range 0° to 36°C (32° to 97°F) -non-freezing -2° to 36°C (28° to 97°F) -non-freezing
Sample rate 1 second to 18 hrs, xed or multiple-rate sampling with up to 8 user-dened sampling intervals
Time Accuracy ± 1 minute per month
Battery
Maximum Depth 70 m (225 ft)
Dimensions 3.18 cm diameter x 16.5 cm, with 6.3 mm mounting hole (1.25 in diameter x 6.5”, ¼ in hole)
CE compliant Yes
18,500 temperature and conductivity measurements when using one conductivity range; 14,400
Low Range: 3% of reading, or 5 μS/cm
Full Range: 3% of reading, or 20 μS/cm,
sets of measurements when using both conductivity ranges (64 kbytes)
Low Range: 0 to 1,000 μS/cm
Full Range: 0 to 10,000 μS/cm
5° to 35°C (41° to 95°F)
whichever is greater
3.6 Volt lithium battery, life: 3 years (at 1 minute logging), typical
Low Range: 100 to 10,000 μS/cm
High Range: 5,000 to 55,000 μS/cm
Low Range: 3% of reading or 50 µS/cm,
whichever is greater
High Range: 5% of reading, in waters within
a range of ±3,000 µS/cm; waters with greater
variation can have substantially greater error
Up to 12% sensor drift per month. Use monthly
start & end-point calibration to compensate
Contact Us
Sales (8am to 5pm ET, Monday through Friday)
Email sales@onsetcomp.com
Call 1-508-759-9500
In U.S. toll free 1-800-564-4377
Fax 1-508-759-9100
Technical Support (8am to 8pm ET, Monday through Friday)
Contact Product Support onsetcomp.com/support/contact
Call 1-508-759-9500
In U.S. toll free 1-877-564-4377
Onset Computer Corporation
470 MacArthur Boulevard
Bourne, MA 02532
Copyright© 2016 Onset Computer Corporation. All rights reserved. Onset, HOBO, HOBOware are registered trademarks of Onset Computer Corporation. Other
products and brand names may be trademarks or registered trademarks of their respective owners. Patented technology (U.S. Patent 6,826,664) MKT1156-0229
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