Hobo U12 Manual

HOBO U12 Temp/RH/2
2 External Data Logger
(Part # U12-013)
© 2008 Onset Computer Corporation
Part #: MAN-U12-013, Doc #: 7662-C
Thank you for purchasing a HOBO data logger. With proper care, it will give you years of accurate and reliable measurements.
The HOBO U12 Temperature/Relative Humidity/2 External Data Logger is a four-channel logger with 12-bit resolution and can record up to 43,000
measurements or events. The two 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.
Inside this package:
• HOBO U12 Temp/RH/
2 External Data Logger
• Mounting kit with magnet, hook and loop tape, tie-wrap mount, tie wrap, and two screws.
Specifications
Measurement range
Temperature: -20° to 70°C (-4° to 158°F)
RH: 5% to 95% RH
External input channels (see sensor manual): 0 to 2.5 DC Volts
Accuracy
Temperature: ± 0.35°C from 0° to 50°C (± 0.63°F from 32° to 122°F), see Plot A
RH: +/- 2.5% from 10% to 90% RH (typical), to a maximum of +/- 3.5%. See Plot B.
External input channels (see sensor manual): ± 2 mV ± 2.5% of absolute reading
Resolution
Temperature: 0.03°C at 25°C (0.05°F at 77°F), see Plot A
RH: 0.03% RH
Drift
Temperature: 0.1°C/year (0.2°F/year)
RH: <1% per year typical; RH hysteresis 1%
Time accuracy ± 1 minute per month at 25°C (77°F), see Plot C
Response time in airflow of 1 m/s (2.2 mph)
Temperature: 6 minutes, typical to 90%
RH: 1 minute, typical to 90%
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
Memory 64K bytes (43,000 12-bit measurements)
Weight 46 g (1.6 oz)
Dimensions 58 x 74 x 22 mm (2.3 x 2.9 x 0.9 inches)
The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).

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)