HOBO
®
U12 Stainless Temp Data Logger
(Part # U12-015, U12-015-02)
© 2003–2011 Onset Computer Corporation. Onset and HOBO are registered trademarks of Onset Computer Corporation. Other products and brand
names may be trademarks or registered trademarks of their respective owners.
7938-G MAN-U12-015
Inside this package:
• HOBO U12 Stainless Temp
Data Logger (U12-015)
or
HOBO U12 Stainless Temp
Data Logger with 5" Probe
(U12-015-02)
• O-Ring Replacement Kit
(U12-015-ORING-E
[EPDM] and U12-015-
ORING-V [Viton])
Thank you for purchasing a HOBO data logger. With proper care, it will give you
years of accurate and reliable measurements.
The HOBO U12 Stainless Temp Data Logger is a single-channel temperature
logger with 12-bit resolution that can record up to 43,000 measurements. The
logger uses a direct USB interface for launching and data readout by a computer.
An Onset software starter kit is required for logger operation. Visit
www.onsetcomp.com for compatible software.
Specifications
Measurement range -40° to 125°C (-40° to 257°F)
Accuracy
± 0.22°C at 25°C (± 0.4°F at 77°F), see Plot
A
Resolution
0.025°C at 25°C (0.045°F at 77°F), see Plot
A
Drift
0.05°C/year + 0.1°C/1000 hrs above 100°C
(0.09°F/year + 0.2°F/1000 hrs above 212°F)
Response time in 1
m/s (2.2 mph) airflow
U12-015: < 10 minutes, typical to 90%
U12-015-02: 2.25 minutes, typical to 90%
Response time in
water
U12-015: < 3.5 minutes, typical to 90%
U12-015-02: 20 seconds, typical to 90%
Time accuracy
± 2 minute per month at 25°C (77°F), see
Plot B
Operating
environment
Air, water, steam, 0 to 100% RH
Operating
temperature
Logging: -40° to 125°C (-40° to 257°F)
Launch/readout: 0° to 50°C (32° to 122°F),
per USB specification
Battery life 3 year typical use, factory replaceable
Memory 64K bytes (43,000 12-bit measurements)
Construction Food-grade 316L stainless steel
Weight
U12-015: 72 g (2.5 oz)
U12-015-02: 82 g (2.9 oz)
Logger dimensions 17.5 x 101.6 mm (0.69 x 4.00 inches)
Probe dimensions
(U12-015-02 only)
4 x 124 mm (0.16 x 4.90 inches)
Pressure/depth rating 2200 psi (1500 m/4900 ft) maximum
Vibration rating
Navy spec: NAVMAT P-9492
(non-probe model only)
NIST certificate
Available for additional charge; temperature
range -30° to 120°C (-22° to 248°F)
The CE Marking identifies this product as
complying with all relevant directives in the
European Union (EU).
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
-40-200 20406080100120
Temperature (°C)
Accuracy/Resolution(°C)
Accuracy
Resolution
Plot A
-400
-300
-200
-100
0
100
200
-40-20 0 20406080100120
Temperature (°C)
Time Base Error (PPM)
-17.3
-13.0
-8.6
-4.3
0.0
4.3
8.6
Time Base Error (Min/Month)
Plot B
Connecting the logger
The U-Family logger requires a 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).
1. Remove the stainless steel end-cap from the logger by
turning it counter-clockwise. If the cap is difficult to turn,
place the stem of a small screwdriver through the hole in
the end-cap for better leverage.
2. Plug the large end of the USB interface cable into a USB
port on the computer.
3. Plug the small end of the USB interface cable into the
logger as shown in the following diagram.
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