Sensor Maintenance

• The working life of HCHO sensor is 6 years, and the working life of O₃ sensor is 2 years. Please contact Milesight to purchase sensor replacement chips and refer to replacing video to replace the sensors.
• Avoid exposing the device to gases with high concentrations over a long period time, or it may damage the device and decrease the performance.
• Do not expose the device to corrosive gas, silicon vapor or high levels of volatile organic compounds.
• Do not clean the device with detergents or solvents such as benzene or alcohol. To clean the device, wipe with a soft moistened cloth. Use another soft, dry cloth to wipe dry.
• Do not paint or cover the device, which may block the air inlets.
• During the transportation and storage, do not take the device out of default antistatic bags.
• It is suggested to place device under well-ventilated environment, otherwise the accuracy of TVOC will drop.
• There is possible TVOC accuracy drift if you store without power for a long time in different devices. If you prefer a more consistent reading with better precision, you can keep the device powered on in clear air for some time according to the below list.

  Storage Time (Power Off)	Operating Time
  Less than 1 month	At least 2 days
  1~6 months	At least 3 days
  More than 6 months	At least 7 days