Hobo U12 User Manual

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

Hobo U12 Specifications

General

Memory Capacity	43, 000 measurements
Battery Life	1 year typical use
Communication	USB
Logging Rate	1 second to 18 hours
Accuracy	±0.35 °C from 0 to 50 °C (±0.63 °F from 32 to 122 °F)
Resolution	0.03 °C at 25 °C (0.05 °F at 77 °F)
Response Time	5 minutes in air moving 1 m/s (typical)
Operating Environment	0 to 95% RH
Dimensions	58 x 33 x 23 mm (2.3 x 1.3 x 0.9 in)

Summary

Product Specifications

Product Accessories

Attaching Sensors and Maintenance

Replacing Desiccant Cartridges

Guidance on checking and replacing desiccant cartridges for optimal logger performance.

Logger Connection and Operation

Connecting the Logger to a Computer

Steps for connecting the HOBO U12 logger to a computer via USB for data management.

Launching and Reading Out the Logger

Instructions on how to start data logging and retrieve recorded data using software.

Protecting the Logger from Static Discharge

Precautions to prevent damage to the logger from electrostatic discharge during handling.

Closing the Logger

Sample and Event Logging

Explanation of how the logger records sensor measurements (samples) and logger activities (events).

Logger Usage and Mounting

Logger Operation Indicators

Description of the LED indicator lights and their meaning during logger operation.

Mounting the Logger

Methods and hardware for securely mounting the logger in its deployment environment.

Battery Replacement