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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
(download at
www.onsetcomp.com/
hoboware-free-download)
Accessory:
• Replacement UV protective
caps (U23-CAP)
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)
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
Relative Humidity Sensor (U23-001A, U23-002A only)
Operation Range 0 to 100% RH, -40° to 70°C (-40° to 158°F)
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;
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
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
Exposure to conditions below -20°C (-4°F) or above 95% RH may
temporarily increase the maximum RH sensor error by an
additional 1%
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
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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 Marking identifies this product as complying with all relevant
directives in the European Union (EU).
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
1-800-LOGGERS 2 www.onsetcomp.com
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HOBO Pro v2 (U23-00x) Manual
Sample and Event Logging
The logger can record two types of data: samples and events.
Samples are the sensor measurements recorded at each logging
interval (for example, temperature every minute). Events are
independent occurrences triggered by a logger activity, such as
Bad Battery or Host Connected. Events help you determine
what was happening while the logger was logging.
The logger stores 64K of data, and can record over 42,000
12-bit measurements.
Deploying and Protecting the Logger
• To clean the logger’s case, use a sponge
with warm, soapy water.
• Use the included clamp to mount the
logger to a surface. The clamp has two
holes for the screws, 44 mm (1.7
inches) apart.
The clamp is slightly tapered to
accommodate the logger. Install the
clamp so the logger is oriented with the
communication window facing up or to
the side. This will prevent condensation
from pooling on the sensor or cable
grommet.
• A solar radiation shield is required if
the logger with internal sensors or the
external sensors will be in sunlight at
any time.
• The U23-001A logger must be
mounted horizontally. If the U23001A logger is being deployed in
a solar radiation shield, it must
be mounted horizontally as
shown in this diagram.
• When deploying a U23-002A
logger, the sensor must be
mounted vertically. If the sensor is
being deployed in a solar radiation
shield, it must be mounted
vertically as shown in this diagram.
• If the logger housing will be in
sunlight, slide the included protective cap over the logger
communication window to protect the window against UV
light.
Drip Loop
• If there are chewing rodents or other cable hazards present,
the sensor cable should be protected in conduit.
• Periodically inspect the three desiccant packs located in the
logger cap. If they are not bright blue, dry them following the
instructions below.
To dry a desiccant pack, remove it from the logger cap and
leave in a warm (≤70
o
C (158oF)), dry location until the bright
blue color is restored. Refer to the Battery section for
instructions on removing and replacing the logger cap.
If a desiccant pack remains pink and will not turn blue,
replace it with a new desiccant pack (DESICCANT1)
• The HUM-RHPCB-x replacement RH sensors are not
compatible with the U23-001A and U23-002A loggers.
Battery
Typical battery life is about three years. Actual battery life is a
function of the number of deployments, logging interval, and
operation/storage temperature of the logger. To obtain a
three-year battery life, use a logging interval of one minute or
greater, and operate and store the logger at temperatures
between 0° and 40°C (32° and 104°F).
Frequent deployments with logging intervals of less than one
minute, and continuous storage/operation at temperatures
above 40°C, will result in significantly lower battery life. For
example, continuous logging at a one-second logging interval
will result in a battery life of approximately one month.
The logger can report and log its own battery voltage. If the
battery falls below 3.1 V, the logger will record a “bad battery”
event in the datafile. If the datafile contains “bad battery”
events, or if logged battery voltage repeatedly falls below 3.3 V,
the battery is failing and should be replaced before the next
deployment. To change the battery:
1. Turn slightly counter-clockwise and pull to remove the
protective cap. Loosen the cable grommet on the opposite
end, if the logger has an external sensor.
2. Carefully pull out the circuit board containing the battery.
(If the logger has an external sensor, you will probably find
it easier to push the cable(s) into the case to push the
circuit board out.)
3. Examine the desiccant packs that were packed into the
case. If the desiccant is not bright blue, put the desiccant
packs in a warm, dry place until the blue color is restored.
Communications
window
Circuit board
Cable from sensor (if applicable)
UV Protective Cap
Drip Loop
• When mounting the logger, be sure to attach the logger so
the logger cable is not being pulled. Also leave about 5 cm (2
inch) of drip loop in the cable where it comes out of the
logger (as shown in the above diagrams) to prevent water
from entering the logger housing.
Battery
Desiccant packs
4. Install a new 1/2 AA, 3.6 Volt lithium battery (part # HP-B).
The negative end of the battery must face towards the
communication LEDs.
5. Use a clean, dry cloth to wipe away any moisture inside the
Grommet for cable
(if applicable)
case.
1-800-LOGGERS 3 www.onsetcomp.com
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6. Push the board and the desiccant packs back into the case,
taking care not to bend the communication LEDs. Align the
board with the grooves inside the case. (If you try to put the
board in upside-down, the battery will get in the way.)
7. Make sure O-ring on the protective cap is still in place. It
should not be pinched, twisted, or trapping dirt or lint,
which could interfere with the protective cap. If you are
replacing it with a new O-ring from an RH sensor
replacement kit, discard the old O-ring and place the new
one into the same groove on the communications window.
Apply a small dot of lubricant from the grease packet
included in the kit on the O-ring. Spread the lubricant
around the O-ring just enough to moisten it while avoiding
getting it on the communications window.
8. Line up the bumps on the protective cap with the notches in
the logger’s case. Push and turn the cap slightly clockwise.
Pull the slack in the sensor cable(s) if applicable. Handtighten the grommet and then turn an additional half turn
with a wrench (do not force).
WARNING: Do not cut open, incinerate, heat above
100°C (212°F), or recharge the lithium battery. The battery
may explode if the logger is exposed to extreme heat or
conditions that could damage or destroy the battery case. Do
not dispose of the logger or battery in fire. Do not expose the
contents of the battery to water. Dispose of the battery
according to local regulations for lithium batteries.
HOBO Pro v2 (U23-00x) Manual
© 2010–2020 Onset Computer Corporation. All rights reserved. Onset, HOBO, and HOBOware are trademarks or
1-800-LOGGERS (564-4377) • 508-759-9500
www.onsetcomp.com/support/contact
registered trademarks of Onset Computer Corporation.
Patent # : 6,826,664 10694-Q
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