HOBO® U10 Temp/RH Data Logger (Part # U10-003)
Inside this package:
Thank you for purchasing a HOBO data logger. With
proper care, it will give you years of accurate and reliable
measurements.
• HOBO U10 Temp/RH
Logger
The HOBO U10-003 is a two-channel
• Mounting kit with magnet, hook-
and-loop tape, and 3/8” double-
sided tape.
Temperature/Relative Humidity Data Logger with 10-bit
resolution and capacity for 52,000 measurements. The
logger uses a direct USB interface for launching and data
readout by a computer.
HOBOware® software is required for logger operation.
Doc # 11196-A, MAN-U10-003
Onset Computer Corporation
Specifications
25
Temperature: -20° to 70°C (-4° to 158°F)
RH: 25% to 95% RH
0
-25
Measurement range
Temperature: ± 0.4°C from 0° to 40°C (± 0.72°F from 32°
to 104°F), see Plot A
RH: ± 3.5% from 25% to 85% over the range of 15° to
45°C (59° to 113°F), see Plot B; ± 5% from 25% to 95%
over the range of 5° to 55°C (41° to 131°F), see Plot B
-50
Accuracy
-75
-100
-125
Temperature: 0.1°C at 25°C (0.2°F at 77°F), see Plot A
RH: 0.07% @ 25°C and 30% RH
Resolution
Drift
Temperature: 0.1°C/year (0.2°F/year)
RH: <1% per year typical
-20
0
20
40
60
Temperature (°C)
Response time in
airflow of 1 m/s
(2.2 mph)
Plot C
Temperature: 10 minutes, typical to 90%
RH: 6 minutes, typical to 90%
Connecting the logger
Approximately ± 1 minute per month at 25°C (77°F),
see Plot C
Time accuracy
Operating range
The U-Series logger requires an Onset-supplied USB interface cable to
connect to the computer. If possible, avoid connecting at temperatures
below 0°C (32°F) or above 50°C (122°F).
Logging: -20° to 70°C (-4° to 158°F); 0 to 95% RH
(non-condensing)
Battery life
Memory
1 year typical use
1. Plug the large end of the USB interface cable into a USB port on the
computer.
64K bytes (52,000 10-bit measurements)
26 g (0.82 oz)
Weight
2. Plug the small end of the USB interface cable into the side of the logger
as shown in the following diagram.
Dimensions
45 x 60 x 20 mm (1.8 x 2.38 x 0.77 inches)
The CE Marking identifies this product as complying with
the relevant directives in the European Union (EU).
3. Load and use logger software to operate the logger (see software
manual).
Temperature Accuracy and Resolution
2
1.5
1
Important: Press this
button for 3 seconds
when logger is
launched with “Trigger
Start” or press for 1
second to record an
event while logging
USB interface
cable plugged
into logger
resolution
accuracy
0.5
If the logger has never been connected to the computer before, it may take
a few seconds for the new hardware to be detected
0
Important: If you configure the logger to start with a trigger start, be
sure to press and hold down the button on the front of the logger for at
least three seconds when you want to begin logging. When you release
the button, the light on the side of the logger will flash rapidly to
indicate that logging has begun.
-20
-10
0
10
20
30
40
50
60
70
Temperature (deg C)
Plot A
U10 RH Accuracy
You can read out the logger while it continues to log, stop it manually with
the software, or let it record data until the memory is full.
100%
90%
Not Specified
+/- 5%
Refer to the software user’s guide for complete details on launching,
reading out, and viewing data from the logger.
80%
70%
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,
the temperature every minute). Events are independent occurrences
triggered by logger activity. Examples of events recorded asynchronously
during deployment include: when the logger is connected to the host, when
the battery is low, end of a datafile once the logger is stopped, and button
pushes.
+/-3.5%
60%
50%
40%
30%
20%
Press the button on the front of the logger for one second to record an
event. Both a “button down” and a “button up” event will be recorded. This
is useful if you want to mark the datafile at a particular point.
0
10
20
30
°C
40
5500
60
The logger stores 64K of data, and can record up to 52,000 samples.
Plot B
© 2005, 2006 Onset Computer Corporation
Part #: MAN-U10-003, Doc #: 11196-A
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