HOBO
®
Pro v2 User’s Manual
(Part # U23-00x)
© 2010 Onset Computer Corporation. All rights reserved. Patent #: 6,826,664.
Onset, HOBO, and HOBOware are registered trademarks of Onset Computer Corporation. Other products and brand names may be trademarks or registered trademarks of their
respective owners.
Inside this package:
•
HOBO
®
Pro v2 logger
•
Clamp and mounting screws
Doc #10694-H, MAN-U23
Onset Computer Corporation
Thank you for purchasing a HOBO data logger. With proper
care, it will give you years of accurate, reliable measurements.
The HOBO Pro v2 logger’s environmentally rugged case is
designed for years of reliable use in outdoor applications. It has
enough memory to record over 42,000 12-bit measurements.
The U23-001 and U23-002 models also feature user-replaceable
RH sensors.
The logger uses an optical USB communications interface (via a
compatible shuttle or base station) for launching and reading out
the logger. The optical interface allows the logger to be
offloaded without compromising the electronics. The USB
compatibility allows for easy setup and fast downloads.
HOBOware
®
software version 2.2.1 or higher is required for
logger operation. Visit www.onsetcomp.com for compatible
software.
Specifications
Temperature Sensor
Operation range
Internal sensors: -40° to 70°C (-40° to 158°F)
U23-002 external temperature sensor: -40° to 70°C (-40° to 158°F)
U23-003 and U23-004 external sensors: -40° to 100°C
(-40° to 212°F), with tip and cable immersion in fresh water
up to 50°C (122°F) for one year
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
-40
-20
0
20
40
60
80
100
Temperature (˚C)
A
ccu
racy/
R
eso
lu
ti
o
n
(
˚C)
Accuracy
Resolution
Plot A
Accuracy
0.2°C over 0° to 50°C (0.36°F over 32° to 122°F); see Plot A
Resolution
0.02°C at 25°C (0.04°F at 77°F); see Plot A
Response time
(typical to 90%)
U23-001 Internal sensor: 40 minutes in air moving 1 m/sec
U23-002 external temperature sensor: 5 minutes in air moving
1 m/sec
U23-003 and U23-004 external sensors: 3 minutes in air moving
1 m/sec; 30 seconds in stirred water
Stability (drift)
< 0.1°C (0.18°F) per year
Relative Humidity Sensor (U23-001, U23-002 only)
Operation range
0-100% RH, -40° to 70°C (-40° to 158°F)
Exposure to conditions below -20°C (-4°F) or above 95% RH may
temporarily increase the maximum RH sensor error by an
additional 1%
Plot B
Accuracy
±2.5% from 10% to 90% RH (typical), to a maximum of ±3.5%.
See Plot B for full range.
Resolution 0.03%
Response time
(typical to 90%)
U23-001: 40 minute in air moving 1 m/sec with protective cap
U23-002: 5 minutes in air moving 1 m/sec with protective cap
Stability (drift)
< 1% per year typical; hysteresis 1%
Logger
Operation range
-40° to 70°C (-40° to 158°F)
Real-time clock
± 1 minute per month 0° to 50°C (32° to 122°F)
Battery
1/2 AA, 3.6 Volt lithium, user-replaceable (part # HP-B)
Battery life (typical use) 3 years with 1 minute or greater logging interval
Memory (non-volatile)
64K bytes memory (approx. 21,000 temperature and RH measurements)
