User Manual Q&AAnswer
Mar 06, 2025 - 11:50 PM
When handling and storing the SENSIRION SHTxx Humidity and Temperature Sensors, it is important to follow certain precautions to ensure their performance and longevity. Here are some guidelines:
1. ESD protection: The sensors should be protected from Electrostatic Discharge (ESD) by handling them in ESD protected areas. This includes grounding all personnel with wrist-straps, grounding non-insulating and conductive objects, and excluding insulating materials from the area. The sensors should also be protected outside the ESD protected area using ESD protective packaging.
2. Exposure to chemicals: The sensors should not come in close contact with volatile chemicals such as solvents or other organic compounds. High concentrations and long exposure to such chemicals can cause drift in the humidity reading. Acids, bases, ozone, and hydrogen peroxide should also be avoided. Cleaning agents and strong air blasts should not be applied to the sensors.
3. Packaging and storage: Prior to assembly or use, it is recommended to store the sensors in the original sealed ESD bag at temperatures between 10°C and 50°C and humidity between 20% and 60% RH. Once removed from the original bag, the sensors should be stored in metal-in antistatic shielded ESD bags or other suitable packaging materials that do not cause sensor pollution.
4. Assembly - Soldering: The sensors can be soldered using standard reflow soldering ovens, following the recommended soldering profile. It is important to use "no clean" solder paste and ensure that the maximum temperatures and exposure times are respected. Manual soldering is not recommended, and rework soldering should be limited to five seconds at up to 350°C.
5. Assembly - Others: Mechanical force should not be applied to the sensors during assembly. No board wash should be applied to the sensors, and it is recommended to use "no-clean" solder paste. If the sensors are exposed to corrosive environments, such as condensed water or corrosive gases, they may need to be protected with a passivation coating. When applying conformal coatings or adhesive tapes, care should be taken to prevent coating the humidity sensor opening.
6. Application in extreme environments: If the sensors are exposed to extreme conditions, such as high humidity, temperature, or corrosive substances, it is important to consult the datasheet for specific guidelines. Exposure to volatile organic compounds at high concentrations and long exposure times should be carefully tested and qualified. Application in harsh environments is the responsibility of the user.
It is important to note that these guidelines may not cover all possible cases, and it is recommended to refer to the complete instruction manual for detailed instructions and additional information.
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