Rotronic - HL 20/21

Manufactured by  Rotronic
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Humidity temperature data loggers

The HL20 and HL21 are accurate humidity temperature data loggers designed for recording ambient conditions in indoor areas such as research laboratories, high-tech manufacturing facilities and warehouses, storage areas and containers for sensitive goods, museums, office buildings, etc.
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Features of HL 20/21
  • HL20: records up to 20,000 pairs of relative humidity and temperature values
  • HL21: records up to 20,000 pairs of temperature values
  • Non-volatile EEPROM memory

Interface & Display

  • Function key: starts and stops data logging, turns optional LC display on and off
  • Optional LC display with backlight (values, message bar and battery charge indicator)
  • Connector for data download, configuration and log function programming

Other Features

  • English or metric unit system
  • Real time clock powered for up to 4 hours without batteries
  • Programmable alarm function (out-of-limit value)
  • Status indicator (green and red LED).
  • Display Sleep function: substantially extends the lifetime of the battery
  • Simulator function (fixed output signals) for validating the recording function
  • HL20: can be set compute and display the dew or frost point
General Specifications
Depth 72 mm
Height32 mm
Width 130 mm
Weight210 g
Additional Specifications

  • Internal sensors (no apparent probe)
  • Optional LC display
  • 0 to 100 %RH
  • Operating Range: -10…60 °C / 0…100 %rh
  • Accuracy: ±0.8 %rh @ 10...60 %rh / ±0.3 K | ±1.3 %rh @ 60...100 %rh / ±0.3 K
  • Calibration and adjustment functions
  • 3 x AA batteries (1.5V)
  • Up to 20 months of data recording without replacing the batteries.

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