• Operating temperature range -20°C to +50°C,  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.

Power

• 3 AAA Alkaline batteries, user-replaceable

Size/Weight

• 5.8 x 7.4 x 3.8 cm (2.3 x 2.9 x .85 inches)
• 46 g (16.0 oz) with batteries

Internal 12-Bit Temperature Sensor

• Measurement range: -20°C to +50°C
• Accuracy: 0.2°C over 0° to 50°C
• Resolution: 0.03% RH @ 25°C
• 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
• Accuracy: +/- 2.5% from 10 to 90% RH.
• Resolution: 0.03% RH @ 25°C
• Response time to 90%: 2 minutes (to 90% in airflow of 1 m/sec)
• Accuracy Drift: <2% over 5 years 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.