Onset U23 Specifications
HOBO® Pro v2 Loggers
Weatherproof loggers for outdoor temperature and humidity measurements
HOBO Pro v2 data loggers are weatherproof loggers
that provide high-accuracy temperature and relative
humidity measurements in a wide range of outdoor
environments.
Supported Measurements:
Temperature, Relative Humidity, Dew Point
Key Advantages:
• Weatherproof housing for use in outdoor or condensing
environments
• High-accuracy measurements
• Replaceable RH sensor provides superior recovery from
condensing conditions
• Small-diameter, external sensor versions for measurements in tight spaces
• Optic USB interface for fast and reliable download
Minimum System Requirements:
1
Base Station*Software
Coupler
*HOBO Base Station or HOBO Waterproof Shuttle required.
1
Coupler included with HOBO Base Station or HOBO Waterproof Shuttle.
For complete information and accessories, please visit: www.onsetcomp.com
Part number
Memory 42,000 measurements
Sampling rate 1 second to 18 hours, xed rate or multiple logging intervals
Battery life 3 years typical, user-replaceable,1/2 AA lithium
Measurement range -40° to 70°C (-40° to 158°F)
Accuracy ± 0.21°C over 0° to 50°C (± 0.38°F over 32° to 122°F)
Resolution (12-bit) ± 0.02°@ 25°C (± 0.04°@ 77°F)
Stability (drift) < 0.1°C (0.18°F) per year
Measurement range 0 to 100% RH, -40° to 70°C (-40° to 158°F)
Accuracy
Resolution (12-bit) 0.05%RH
Measurement Range
Accuracy ± 0.21°C from 0° to 50°C (± 0.36°F from 32° to 122°F)
Resolution 0.02°@ 25°C (0.04°@ 77°F)
Dimensions Housing measures 10.2 × 3.8 cm (4.0 × 1.5 in.)
CE compliant Yes
U23-0012
(Internal Temp/RH)
Internal Temperature
Relative Humidity (U23-001 & U23-002 only)
±2.5% from 10%RH to 90%RH typical to a maximum of ±3.5% including hysteresis at 25˚C (77˚F);
below 10%RH and above 90%RH ±5% typical
External Temperature
U23-002: -40° to 70°C (-40° to 158°F), U23-003 & U23-004: -40° to 100°C (-40° to 212°F) with
sensor tip and cable immersion in fresh water up to 50°C (122°F) for one year
U23-0022
(External Temp/RH)
U23-003
(2x External Temp)
U23-004
(Temp/External Temp)
Contact Us
Sales (8am to 5pm ET, Monday through Friday)
Email sales@onsetcomp.com
Call 1-508-759-9500
In U.S. toll free 1-800-564-4377
Fax 1-508-759-9100
Technical Support (8am to 8pm ET, Monday through Friday)
Contact Product Support onsetcomp.com/support/contact
Call 1-508-759-9500
In U.S. toll free 1-877-564-4377
Onset Computer Corporation
470 MacArthur Boulevard
Bourne, MA 02532
Copyright© 2016 Onset Computer Corporation. All rights reserved. Onset, HOBO, HOBOware are registered trademarks of Onset Computer Corporation. Other
products and brand names may be trademarks or registered trademarks of their respective owners. Patented technology (U.S. Patent 6,826,664) MKT1155-0229
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