Specifications for the U14-001

Specifications for the U14-001
Onset Computer Corporation
HOBO U14 LCD Logger - Temperature/Relative Humidity (RH) Data
Logger - U14-001
Temperature, Relative Humidity
Contact Onset at 1-800-564-4377
Faster USB data download time
Improved Temp/RH sensor resolution
Real-time display of Temperature and RH
Alarm display and output ensure timely notification of
out-of-range conditions
Two models to choose from - internal Temp/RH or
external Temp or Temp/RH
Optional Remote Alarm and Autodialer
Optional protective case for wet or condensing
Compatible with HOBOware and HOBOware Pro
software for logger setup, graphing and analysis
HOBO U14 data loggers display, record, and provide alarm notifications of temperature and humidity conditions. Receive out-of-range alarms
notifications with the optional Auto Dialer or Remote Audible Alarm. These loggers are well-suited for use in manufacturing, processing, and
storage environments where reliable monitoring and documentation of temperature and relative humidity conditions is critical.
Detailed Specifications:
Operating temperature range -20°C to +50°C, (-4°F to +122°F) , 0 to 100% RH non-condensing
Operating relative humidity range 0 to 95%, non-condensing, noncorrosive environment
Logger Capabilities
Temp and RH: 21,500 measurements
Temp Only: 43,000 measurements
Software-selectable sampling intervals: 1 second up to 18 hours, recording times up to 1 year
Programmable start time/date
Recording modes: Stop when full
Launch Modes: Immediate, Delayed
Nonvolatile EEPROM memory retains data even if batteries fail
Size: 33 x 50.8 mm (1.3 x 2 inches)
Displays temperature and relative humidity simultaneously
Displays °C or °F (selectable within host software)
Displays memory remaining and battery level
Displays flashing ALERT for out-of-limits conditions (selectable within host software) and stops flashing on offload or return to normal
High and low set points for both temperature and relative humidity
Selectable delays for each set point.
Alert conditions reset on offload or return to normal range.
Selectable Contact Relay: Normally Closed or Normally Open
Contact rating: 48VDC, 1A max
Contact resistance: less than 1 Ohm
Wire size range is 22AWG to 14AWG
0% Low Battery Range Communications
Offloads data to PC or U-Shuttle via USB cable
Readout full logger (64K) in less than 30 seconds
Time accuracy: ±1 minute per month at 20°C (68°F).
3 AAA Alkaline batteries, user-replaceable
125 x 92 x 31 mm (4.9 x 3.6 x 1.2 inches)
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: ±0.21°C from 0° to 50°C (±0.38°F from 32° to 122°F); ±0.13°C (0.24°F) typical
Resolution: 0.02°C @ 25°C (0.04°F @ 77°F)
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% including hysteresis
Resolution: 0.03°C RH @ 25°C (0.05° at 77°F)
Response time to 90%: 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.
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