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HOBO U24 - Conductivity/Salinity (Salt Water) Data Logger

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The HOBO U24-002-C is a cost-effective data logger for measuring salinity, conductivity and temperature in 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.

Part Number: U24-002-C

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$2,241.00 ex GST

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Overview
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Specifications

Measure salinity, conductivity, and temperature in saltwater environments

The HOBO U24-002-C is a cost-effective data logger for measuring salinity, conductivity and temperature in 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. Data from the logger can be used with data from the HOBO U26 Dissolved Oxygen Logger for monitoring percent dissolved oxygen saturation.

Note: When monitoring salinity in waters with more than ±5,000 uS/cm variation, refer to the accuracy shown in Plot C in the product specifications to determine if the accuracy is acceptable for your needs. Monthly field calibration readings are typically required to achieve the best accuracy.

Non-contact sensor provides long life
Provides easy access to sensor for cleaning and shedding air bubbles
Two user-selectable ranges provide measurements from 100 to 55,000 uS/cm.
The Delrin housing will not corrode in saltwater
HOBOware Pro software enables start/end-point calibration to compensate for any fouling and provides easy conversion to specific conductance and salinity using the Practical Salinity Scale 1978 (PSS-78)
USB optical interface provides high-speed, reliable salinity data offload in wet environments
Compatible with the HOBO Waterproof Shuttle for easy and reliable data retrieval and transport

The HOBO U24 Conductivity/Salinity data logger features a non-contact sensor with a Titanium Pentoxide coating. This coating prevents the sensor from coming in contact with the water, which in turn prevents tarnishing or corrosion associated with traditional electrode sensors. This sensor coating is also inert, enabling fouling to be easily wiped off the sensor.

Important Info

This logger 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.

HOBO Conductivity U24 Data Loggers

Learn how to collect water quality data with this conductivity and temperature data logger. The HOBO Conductivity U24 Data Loggers is specially coded to provide a non-contact sensor. The electrodes are never in direct contact with water so they do not corrode. In addition, this logger sheds air bubbles for better accuracy measurements. This product also comes with durable housing, providing many years of use in freshwater or saltwater. Moreover, the battery lasts up to three years. Optical communications make it possible for researchers to offload data even when the logger is wet.

Connecting with Conductivity Water Quality Monitoring Using HOBO Conductivity Salinity Data Logger

Whether you are choosing a conductivity data logger for the first time or have plenty of experience measuring conductivity, this webinar can help you determine the type of logger that best suits your needs, for either fresh or saltwater deployments.

Data Logger Basics for Water Monitoring

View this webinar on the basics of data logging, with an introduction to HOBO water monitoring solutions.

This is your chance to learn the basics. This webinar will review:

• What data loggers are, what they measure, and who can benefit from using them
• Important things to consider when selecting a data logger
• The steps involved in using a data logger
• Data logger deployment tips

This webinar will also introduce a range of HOBO data loggers and highlight real-world examples of water monitoring applications.

Technical Information
Measurements	Actual Conductivity, Temperature, Specific Conductance at 25C (calculated), Salinity (calculated using PSS-78, the Practical Salinity Scale 1978)
Conductivity Measurement Range (Calibrated Range)
High range	5000 to 55,000 uS/cm
Low range:	100 to 10,000 uS/cm
Over the range of 5 to 35C (41 to 95F)
Temperature Measurement Range:	5 to 35C (41 to 95F)
Specific Conductance Accuracy (in Calibrated Range using Conductivity Assistant and Calibration Measurements)
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 (see Plot C)
Conductivity Resolution:	2 uS/cm
Temperature Accuracy:	0.1°C (0.2°F) at 25°C (77°F)
Temperature Resolution:	0.01°C (0.02°F)
Conductivity drift:	Up to 12% sensor drift per month, exclusive of drift from fouling. Monthly start- and end-point calibration should be used with the HOBOware Conductivity Assistant to achieve the specified Specific Conductance accuracy.
Response time:	1 second to 90% of change (in water)
Operating range:	-2 to 36C (28 to 97F) – non-freezing
Memory	18,500 temperature and conductivity measurements when using one conductivity range; 11,500 sets of measurements when using both conductivity ranges (64 KB total memory)
Sample rate:	1 second to 18 hrs, fixed or multiple-rate sampling with up to 8 user-defined sampling intervals
Clock accuracy:	+/- 1 minute per month
Battery life:	3 years (@ 1 min logging)
Maximum depth:	70 m (225')
Weight:	193 gm (6.82 ounces), buoyancy in freshwater: -59.8 gm (-2.11 ounces)
Size:	3.18 cm diameter x 16.5 cm, with 6.3 mm mounting hole (1.25" diameter x 6.5", ¼" hole)
Wetted housing materials:	Delrin housing, 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.
CE compliance:	The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).

Plot A

Plot B

Accuracy

Measure salinity, conductivity, and temperature in saltwater environments

Non-contact sensor provides long life
Provides easy access to sensor for cleaning and shedding air bubbles
Two user-selectable ranges provide measurements from 100 to 55,000 uS/cm.
The Delrin housing will not corrode in saltwater
HOBOware Pro software enables start/end-point calibration to compensate for any fouling and provides easy conversion to specific conductance and salinity using the Practical Salinity Scale 1978 (PSS-78)
USB optical interface provides high-speed, reliable salinity data offload in wet environments
Compatible with the HOBO Waterproof Shuttle for easy and reliable data retrieval and transport

Important Info

This logger 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.