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HOBO® Pro v2 (U23-00x) Manual
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 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
HOBO Pro v2 U23-004 shown
HOBO Pro v2 Logger
Models: U23-001A
U23-002A
U23-003
U23-004
Included Items:
• Clamp and mounting screws
• UV protective cap
Required Items:
••Coupler (COUPLER2-E) with
USB Optic Base Station (BASEU-4) or HOBO Waterproof
Shuttle (U-DTW-1)
HOBOware Pro 3.7.19 or later
be offloaded without compromising the electronics. The USB compatibility allows for easy
setup and fast downloads.
Specifications
Temperature Sensor
Operation Range U23-001A internal sensor: -40 to 70°C (-40 to 158°F)
U23-002A 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 U23-001A and U23-002A: ±0.25°C from -40 to 0°C (±0.45 from -40
Resolution U23-001A and U23-002A: 0.04°C (0.072°F)
Response Time
(Typical to 90%)
Drift U23-001A and U23-002A: <0.01°C (0.018°F) per year
to 32°F), ±0.2°C from 0 to 70°C (±0.36 from 32 to 158°F)
U23-003 and U23-004: ±0.21°C from 0° to 50°C (±0.38°F from 32°
to 122°F); see Plot A
U23-003 and U23-004: 0.02°C at 25°C (0.04°F at 77°F); see Plot A
U23-001A internal sensor: 10 minutes in air moving 1 m/sec
U23-002A external temperature sensor: 3 minutes, 45 seconds 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
U23-003 and U23-004: <0.1°C (0.18°F) per year
Accessory:
• Replacement UV protective
caps (U23-CAP)
Relative Humidity Sensor (U23-001A, U23-002A only)
Operation Range 0 to 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%
Accuracy ±2.5% from 10% to 90% RH typical to a maximum of ±3.5%
Resolution 0.05%
Response Time
(Typical to 90%)
Drift <1% per year typical
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 (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
Materials All models: ASA styrene polymer housing and mounting clamp;
including hysteresis at 25°C (77°F); below 10% and above 90% ±5%
typical
U23-001A: 40 minutes in air moving 1 m/sec with protective cap
U23-002A: 15 seconds in air moving 1 m/sec
measurements)
polypropylene protective cap; Buna-N o-ring(s); U23-001A,
U23-002A only: ASA styrene polymer RH sensor cap; modified
hydrophobic polyethersulfone membrane
10694-Q
Specifications (continued)
Cables U23-001A: No cables
U23-002A: 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 Fixed-rate or multiple logging intervals, with up to 8 user-defined logging
Offload Modes Offload while logging; stop and offload
Battery Indication Battery voltage can be viewed in status screen and optionally logged in
Weight U23-001A: 57 g (1.5 oz); U23-002A: 118 g (3.1 oz); U23-003: 138 g (3.7 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)
intervals and durations; logging intervals from 1 second to 18 hours
datafile. Low battery indication in datafile.
U23-004: 102 g (2.7 oz)
The CE Mark
directives in the European Union (EU).
ing identifies this product as complying with all relevant
HOBO Pro v2 (U23-00x) Manual
Plot A
(applies to U23-003 and
U23-004 models only)
Connecting the Logger
The HOBO Pro v2 requires a coupler (COUPLER2-E) and USBOptic Base Station (BASE-U-4) or HOBO Waterproof Shuttle
(U-DTW-1) to connect to the computer.
IMPORTANT: USB 2.0 specifications do not guarantee
operation outside the range of 0°C (32°F) to 50°C (122°F).
1. Install HOBOware 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.
7. Use the logger software to launch the logger, check the
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.
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.
Operation
A light (LED) in the communications window of the logger
confirms logger operation. (In brightly lit areas, it may be
necessary to shade the logger to see the LED blink.) This table
explains when the light blinks during logger operation:
When: The OK Light Does This:
The logger is logging Blinks once every one to four
The logger is awaiting a
start because it was
launched in Start At
Interval or Delayed Start
mode
seconds (the shorter the logging
interval, the faster the light blinks);
blinks when logging a sample.
Blinks once every eight seconds
until logging begins
2
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