Onset Computer Corporation
HOBO U14
13
User’s Guide
Power
•
3 AAA Alkaline batteries, user-replaceable
Dimensions
•
125 x 92 x 31 mm (4.9 x 3.6 x 1.2 in)
Weight
•
170 g (6.0 oz) with batteries
Internal 12-Bit Temperature Sensor
•
Measurement range: -20°C to +50°C (-4°F to +122°F)
•
Accuracy:
0.2°C over 0° to 50°C (0.36°F over 32° to 122°F) (see Plot A)
•
Resolution:
0.03°C @ 25
°
C (0.05°F @ 77
°
F) (see Plot A)
•
Response time: 15 minutes (to 90% in airflow of 1 m/sec)
•
Temperature Accuracy Drift: Negligible
Internal 12-Bit Relative Humidity Sensor
•
User replaceable
•
Measurement range: 0-100% RH, -20 to 50°C (-4 to 122°F)
•
Accuracy: +/- 2.5% from 10% to 90% RH (typical), to a maximum of +/- 3.5%. (see Plot B)
•
Resolution:
0.03% RH @ 25
°
C (77
°
F)
•
Response time: 2 minutes (to 90% in airflow of 1 m/sec)
•
Accuracy Drift: <2% over 5 years typical
•
Hysteresis: 1% Typical
External Sensors
For External Sensor Specifications, see the sensor’s user manual.
Battery Life
The batteries will last one year in typical conditions (logging intervals of
≥
1 minute with weekly offloads and average temperatures
greater than 10°C or +50°F). Frequent offloads and/or extreme temperatures will reduce battery life.
At temperatures below freezing (0°C or +32°F), batteries will typically require replacement every six months. In these conditions the
battery level bar graph should be checked regularly.
See Battery Level Indicators on page 15.
The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).
Summary of Contents for HOBO U14
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