U14 LCD Logger - Temperature/Relative Humidity (RH) Data Logger - U14-001

The HOBO U14 LCD Temperature/Relative Humidity (RH) Data Logger displays and records temperature and humidity conditions. It is well-suited for use in manufacturing, processing, and storage environments where reliable monitoring and documentation of specific temp/RH conditions are critical. Data is offloaded via USB to a PC or Mac computer. An alarm display and built-in relay for use with Onset's Remote Alarm and/or Autodialer accessories assure timely notification of alarm conditions.

Environmental

• 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

• Capacity:
  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

LCD

• 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 range.

Alarms

• 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

Timekeeping

• Time accuracy: ±1 minute per month at 20°C (68°F).

Power

• 3 AAA Alkaline batteries, user-replaceable

Size/Weight

• 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: 0.2°C over 0° to 50°C (0.36°F over 32° to 122°F), see plot A
• Resolution: 0.03°C RH @ 25°C (0.05° at 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)
• ±2.5% from 10% to 90% RH (typical), to a maximum of ±3.5%, see Plot B
• 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.

The following are associated resources for this product. In general users of this product can gain insight into its possible use by utilizing the resources below.