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HOBO® U24 Conductivity Logger (U24-002-C) Manual
HOBO Conductivity Logger
Model: U24-002-C
Included Item:
• Communications window
protective cap
Required Items:
• Coupler (COUPLER2-C) with
USB Optic Base Station (BASE-
U-4) or HOBO Waterproof
Shuttle (U-DTW-1)
• HOBOware Pro 3.2 or later
with the Conductivity
Assistant 2.1 or later
• Conductivity meter for
calibration measurements
Accessories:
• U2X Protective Housing
(HOUSING-U2X)
• Replacement communications
window protective caps
(U22-U24-CAP)
16844-C MAN-U24-002-C
Distributed by MicroDAQ.com, Ltd.
The HOBO U24 Conductivity logger (U24-002-C) measures actual conductivity and
temperature, and can provide specific conductance at 25°C and salinity with the
HOBOware® Conductivity Assistant. This easily deployable, rugged logger is ideal for
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 when deployed with a HOBO U26 Dissolved
Oxygen logger. An optional U2X Protective Housing accessory (HOUSING-U2X) is available
to further protect the logger, reduce fouling, and simplify mounting in harsh environments.
Specifications
Measurements
Conductivity Measurement
Ranges
Conductivity Calibrated
Range - Temperature Range
Conductivity Extended
Ranges
Temperature Measurement
Range
Specific Conductance
Accuracy (in Calibrated
Range using Conductivity
Assistant and Calibration
Measurements)
Conductivity Resolution
Temperature Accuracy
(in Calibrated Range)
Temperature Resolution
Conductivity Drift
Response Time
Operating Range
Memory
Sample Rate
Clock Accuracy
Battery
Battery Life
Maximum Depth
Weight
Size
Wetted Housing Materials
www.MicroDAQ.com
Actual Conductivity, Temperature, Specific Conductance at 25°C
(calculated), Salinity (calculated using PSS-78, the Practical Salinity
Scale 1978)
Low Range: 100 to 10,000 µS/cm
High Range: 5,000 to 55,000 µS/cm; see Plots A and B on next page
for salinity and specific conductance ranges
5° to 35°C (41° to 95°F)
Low Range: 50 to 30,000 µS/cm
High Range: 1,000 to 55,000 µS/cm
(readings below these ranges reported as 0)
-2° to 36°C (28° to 97°F)
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 of the calibration point; waters with greater
variation can have substantially greater error (see Plot C)
2 µS/cm (typical)
0.1°C (0.2°F)
0.01°C (0.02°F)
Up to 12% sensor drift per month, exclusive of drift from fouling.
Monthly start- and end-point calibration should be used with
HOBOware Conductivity Assistant to achieve the specified Specific
Conductance accuracy
1 second to 90% of change (in water)
-2° to 36°C (28° to 97°F) - non-freezing
18,500 temperature and conductivity measurements when using
one conductivity range; 14,400 sets of measurements when using
both conductivity ranges (64 KB total memory)
1 second to 18 hrs, fixed or multiple-rate sampling with up to 8
user-defined sampling intervals
±1 minute per month
3.6 Volt lithium battery
3 years (at 1 minute logging)
70 m (225 ft)
193 g (6.82 oz), buoyancy in freshwater: -59.8 g (-2.11 oz)
3.18 cm diameter x 16.5 cm, with 6.3 mm mounting hole (1.25 in.
diameter x 6.5 in., 0.25 in. hole)
Delrin®, epoxy, stainless steel retaining ring, polypropylene, Buna
rubber O-ring, titanium pentoxide (inert coating over sensor); all
materials are suitable for long-term use in saltwater
The CE Marking identifies this product as complying with all
relevant directives in the European Union (EU).
(603) 746-5524
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Summary of Contents for Onset HOBO U24
- Page 1 HOBO® U24 Conductivity Logger (U24-002-C) Manual The HOBO U24 Conductivity logger (U24-002-C) measures actual conductivity and temperature, and can provide specific conductance at 25°C and salinity with the HOBOware® Conductivity Assistant. This easily deployable, rugged logger is ideal for 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.
- Page 2 HOBO U24 Conductivity Logger (U24-002-C) Manual Specifications (continued) Plot A: Salinity Range* Plot B: Specific Conductance Range in Saltwater * The Practical Salinity Scale 1978 (PSS-78) used to calculate salinity is valid for salinities in the range of 2 to 42 ppt. For salinities outside of this range, use the measured conductivity and temperature data from the logger with a calculation appropriate for your salinities.
-
Page 3: Operation
Waterproof Shuttle to attach it to a USB port on the serious damage to the sensor and logger electronics. There are computer. no user-serviceable parts inside the case. Contact Onset Technical Support at 1-800-LOGGERS (1-800-564-4377) or an 2. Attach the coupler to the base station or shuttle. - Page 4 HOBO U24 Conductivity Logger (U24-002-C) Manual ranges (the calibrated ranges are also printed on the logger freshwater to remove any residual salt before taking your first housing). The logger will not record readings outside of the calibration readings. extended range selected. (For the U24-002-C, readings Method 1: below the extended range are reported as 0.) If in doubt on...
- Page 5 Deploying the Logger The HOBO U24 Conductivity logger is designed to be easy to deploy in many environments. The small size of the logger is convenient for use in small wells and allows the logger to be Reading Out the Logger and Maintenance mounted and/or hidden in the field.
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Page 6: Battery Guidelines
4% error added to the DO measurements (percent of the regulations for lithium batteries. DO reading in mg/L). © 2013 Onset Computer Corporation. All rights reserved. Onset, HOBO, and HOBOware are 1-800-LOGGERS (564-4377) • 508-759-9500 trademarks or registered trademarks of Onset Computer Corporation.