Hobo Pro v2 User Manual

HOBO® Pro v2 User’s Manual
(Part # U23-00x)

Inside this package:

®

• HOBO

Pro v2 logger

• Clamp and mounting screws

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.

®

software version 2.2.1 or higher is required for

Doc #10694-H, MAN-U23
Onset Computer Corporation

HOBOware
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

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%)

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)

Accuracy

Resolution 0.03%

Response time
(typical to 90%)

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)

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

Exposure to conditions below -20°C (-4°F) or above 95% RH may
temporarily increase the maximum RH sensor error by an
additional 1%

±2.5% from 10% to 90% RH (typical), to a maximum of ±3.5%.
See Plot B for full range.

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

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

Accuracy/Resolution (˚C)

0

-40 -20 0 20 40 60 80 100

Accuracy
Resolution

Temperature (˚C)

Plot A

Plot B

© 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.

HOBO Pro v2 User’s Manual

Materials All models: ASA styrene polymer housing and mounting clamp; polypropylene protective cap; Buna-N o-ring(s);

U23-001, U23-002 only: ASA styrene polymer RH sensor cap; modified hydrophobic polyethersulfone membrane

Cables U23-001: No cables

U23-002: One 184 cm (6 ft.) PVC cable; sensor diameter 1 cm (0.38 in.)
U23-003: Two 184 cm (6 ft.) PVC cables; sensor diameter 0.5 cm (0.20 in.)
U23-004: One 184 cm (6 ft.) PVC cable; sensor diameter 0.5 cm (0.20 in.)

Environmental rating

Launch modes Immediate start; delayed start

Logging interval

Offload modes Offload while logging; stop and offload

Battery indication Battery voltage can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile.

Weight U23-001: 57 g (1.5 oz); U23-002: 118 g (3.1 oz); U23-003: 138 g (3.7 oz); U23-004: 102 g (2.7 oz)

Dimensions Housing measures 10.2 × 3.8 cm (4.0 × 1.5 in.)

NIST certificate Temperature certificate available for additional charge

Electronics housing is NEMA 6P equivalent (tolerant of brief submergence);
Units with RH sensors are NEMA 4 equivalent (splash-resistant)

Fixed-rate or multiple logging intervals, with up to 8 user-defined logging intervals and durations; logging intervals from
1 second to 18 hours (refer to HOBOware software manual)

The CE Marking identifies this product as complying with the relevant directives in the European Union (EU).

Accessories available

• RH sensor replacement kit for U23-001

(Part # HUM-RHPCB-1)

• RH sensor replacement kit for U23-002

(Part # HUM-RHPCB-2)

Connecting the logger

The HOBO Pro v2 requires a coupler (Part # COUPLER2-E)
and USB-Optic Base Station (Part # BASE-U-4) or HOBO
Waterproof Shuttle (Part # U-DTW-1) to connect to the
computer.

1. Install the logger software on your computer before

proceeding.

2. Follow the instructions that came with your base station or

shuttle to attach the base station or shuttle to a USB port on
the computer.

3. Make sure the logger’s communications window is clean and

dry. (Use a clean, nonabrasive cloth, if necessary.) If the
logger is damp, wipe off excess moisture.

4. Attach the coupler to the base station or shuttle, then insert

the logger into the coupler with the ridge on the logger
aligned with the ridge on the coupler.

5. If you are using the HOBO Waterproof Shuttle, briefly press

the coupler lever to put the shuttle into base station mode.

6. If the logger has never been connected to the computer

before, it may take a few seconds for the new hardware to be
detected by the computer.

Use the logger software to launch the logger, check the

7.

logger’s status, read it out, stop it manually with the software,
or let it continue to record data until the memory is full. Or,
use the HOBO Waterproof Shuttle to read out and relaunch
the logger in the field.

Refer to the software user’s guide for complete details on
launching, reading out, and viewing data from the logger.

Important: USB communications may not function properly
at temperatures below 0°C (32°F) or above 50°C (122°F).

Note: The first time you launch the logger, the deployment

number will be greater than zero. Onset launches the loggers to
test them prior to shipping.

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