HygroLog HL-20 High Precision Low Cost Data Logger

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This compact data logger for humidity and temperature measurement offers high precision and reliability at a reasonable price. The HL20 series is easy to use and deployable in a wide range of applications. Thanks to its integrated batteries, the HL20 works completely independently and offers its users maximum flexibility.


  • Highest accuracy at 0.8 %RH and 0.2C
  • Outstanding long term stability
  • 20,000 data point memory with date & time stamps
  • Programmable alarm limits
  • Programmable recording intervals
  • Psychrometric calculations of dew and frost point values available
  • FDA 21 CFR Part 11 / GAMP 4 compliant
  • UART interface
  • Long battery life
Dimensions 130 x 72 x 32 mm
Operating range electronics -10…60 °C / 0…100 %RH
Accuracy at 23 ±5 °C ±0.8 %RH @ 10...60 %RH / ±0.3 K 
±1.3 %RH @ 60...100 %RH / ±0.3 K
Measuring range with integrated probe -10…60 °C / 0…100 %RH
Power supply / Power consumption 3x AA (1.5 V) batteries
Long-term sensor stability <1 %RH / year
Response time t 63 3 min. (typically)
Psychrometric calculations Dew or frost point
Measurement interval 5 sec. to 1 hour in 5 sec. increments
Memory size 20000 data values (%rh/°C, Date, Time)
Status indicator LED 5 sec.: Green flash when recording data, red flash for out-of-limit value or logger problem
Communication interfaces Mini USB (UART)
Enclosure material ABS
IP protection rating IP40
FDA/GAMP compatibility FDA 21 CFR Part 11 and GAMP compatible

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