HOBO Fresh Water Conductivity Data Logger

A high-accuracy, cost-effective data logger that measures and records conductivity and temperature in streams, lakes, and other freshwater sources. Recommended for monitoring aquifers for saltwater intrusion and road and agricultural runoff, this logger’s open access to its sensor simplifies cleaning and maintenance, and its non-contact sensor minimizes measurement errors related to drift. Also features software-based drift compensation.

The titanium pentoxide coating on the non-contact sensor prevents it from coming into contact with the water, thereby preventing tarnishing or corrosion associated with traditional electrode sensors. This sensor coating is also inert, so fouling can be easily wiped off the sensor.

Highlighted Features

Titanium pentoixed coated non-contact sensor rovides long life and less measurement drift
Provides easy access to sensor for cleaning and shedding air bubbles
HOBOware Pro software enables start/end-point calibration to compensate for any fouling and provides easy conversion to specific conductance and salinity
USB optical interface provides high-speed, reliable data offload in wet environments
Compatible with the HOBO Waterproof Shuttle for easy and reliable data retrieval and transport

In what environment does this data logger operate?

This data logger operates in outdoor and underwater environments.

What measurements does this data logger support?

The U24-001 data logger supports the following measurements: Conductivity/Salinity and Temperature

Specifications

Measurements	Actual Conductivity, Temperature, Specific Conductance at 25°C (calculated)
Conductivity Calibrated Measurement Ranges	Low Range: 0 to 1,000 µS/cm Full Range: 0 to 10,000 µS/cm
Conductivity Calibrated Range – Temperature Range	5° to 35°C (41° to 95°F)
Conductivity Extended Ranges	Low Range: 0 to 2,500 µS/cm Full Range: 0 to 15,000 µS/cm
Temperature Measurement Range	-2° to 36°C (28° to 97°F)
Specific Conductance Accuracy (in Calibrated Range)	Low Range: 3% of reading, or 5 µS/cm, and Full Range: 3% of reading, or 20 µS/cm, whichever is greater, using Conductivity Data Assistant and calibration measurements
Conductivity Resolution	1 µS/cm
Temperature Accuracy	0.1°C (0.2°F) at 25°C (77°F)
Temperature Resolution	0.01°C (0.02°F)
Conductivity Drift	Less than 3% sensor drift per year, exclusive of drift from fouling
Response Time:	1 second to 90% of change

The country of origin for this product is the United States. To see the full specifications for this product, please see our product manual found under the documentation tab if available.
Memory:	18,500 temperature and conductivity measurements when using one conductivity range; 14,400 sets of measurements when using both conductivity ranges (64kbytes)
Sample Rate:	1 second to 18 hrs, fixed or multiple-rate sampling with up to 8 user-defined sampling intervals
Battery life:	3 years (@ 1 min logging)
Maximum depth:	70 m (225′)
Operating range:	-2 to 36°C (28° to 97°F) – non freezing
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)
Calibrated range:	Conductivity: Low Range: 0 to 1,000 µS/cm; Full Range: 0 to 10,000 µS/cm – Temperature: 5 to 35C (41 to 95F)
Accuracy:	Conductivity: 3% of reading, or 5 µS/cm, whichever is greater / Temperature: 0.1C (0.2F)
Resolution:	Conductivity: 1 uS/cm – Temperature: 0.01°C (0.02°F)
Response Time:	1 second to 90% of change