Rotronic HYGROLOG HL-20

The main fields of use for humidity measuring equipment lie in the pharmaceutical and food industries, heating, ventilation and air-conditioning (HVAC) applications as well as drying processes and storage. Measurement of air humidity moreover plays a key role in meteorology, while archives and museums also use data loggers or humidity measuring instruments.


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CTH Industrial Controls can provide you with service and start up assistance for Rotronic measurement solutions.

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The compact data logger for humidity and temperature measurement offers high precision and reliability at a reasonable price. The HL-20 series is easy to use and
deployable in a wide range of applications. Thanks to its integrated batteries, the HL-20 works completely independently and offers its users maximum flexibility.

Warehouses, factory halls, museums, office buildings, clean rooms, shipping, libraries, test facilities

• Highest accuracy at 0.8 %RH and 0.2 ˚C
• 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