HOBO
®
U12 4-External Channel
Outdoor/Industrial Data Logger
(Part # U12-008)
© 2009 Onset Computer Corporation
Part #: MAN-U12008, Doc #: 13132-A
Inside this package:
• HOBO U12 4-External Channel Outdoor/Industrial Data Logger
• Desiccant pack
• Mounting/spare parts kit: Allen wrench, dome plug and O-ring, four
mounting screws, and four flat washers
Thank you for purchasing a HOBO data logger. With proper care, it will give
you years of accurate and reliable measurements.
The HOBO U12 4-External Channel Outdoor/Industrial data logger has a 12-
bit resolution and can record up to 43,000 measurements or events. The four
external channels accept a variety of sensors, including temperature and split-
core AC current sensors as well as 4-20 mA and voltage input cables (sold
separately). The logger uses a direct USB interface for launching and data
readout by a computer.
An Onset software starter kit is required for logger operation. Visit www.onsetcomp.com for compatible software.
Specifications
Measurement range External input channels (see sensor manual): 0 to 2.5 DC Volts
Accuracy
(logger only)
± 2 mV ± 2.5% of absolute reading
± 2 mV ± 1% of reading for logger-powered sensors
Resolution 0.6mV
Time accuracy ± 1 minute per month at 25°C (77°F), see Plot A
Operating range
-20 to 70°C (-4° to 158°F)
Weatherproof case tested to NEMA 6 standard
Operating temperature
Logging: -20° to 70°C (-4° to 158°F)
Launch/readout: 0° to 50°C (32° to 122°F), per USB specification
Battery life 1 year typical use (see “Battery” details on last page)
Memory 64K bytes (43,000 12-bit measurements)
Weight 200 g (7 oz)
Dimensions 140 x 137 x 32 mm (5.5 x 5.38 x 1.25 inches)
The CE Marking identifies this product as complying with all relevant directives in
the European Union (EU).
Plot A
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