Some applications require the usage of the HDC in harsh environments. Ensure that the exposure of the sensor to the maximum limit of temperature and humidity operating conditions meets the device-specific data sheet guidelines. Limiting exposure to volatile organic compounds at high concentration and long exposure time is critical. Usage in harsh environments must be carefully tested and qualified.

Exposure to any aqueous solutions is highly discouraged. In the event some aqueous exposure cannot be avoided, it is recommended to use the HDC3022 and follow the guidelines below:

• Exposure to acids or bases can affect humidity output accuracy readings
• Bases are less damaging than acidic solutions. All acids must be considered damaging to the sensor. Etching substances such as H₂O₂ or NH₃ at high concentrations can be damaging to the sensor.
• Corrosive solutions at very low concentrations are not damaging to the sensor itself. However, make sure that the solder contacts are not damaged.