BME280 coating insulation

Hi, are there recommendation how to protect BME280's electrical connections from enviromental?

Our company uses BME280 as Temperature/Pressure/Relative Humidity sensor in outdoor ecology hardware. So the sensor PCB is working in conditions RH up to 100%, T=-40...+40, it is caused electrical connections problem (tracks/contact pad/etc not protected from the environment).

We want to protect electrical connections from the environment, without breaking "Handling, soldering & mounting instructions" (https://www.bosch-sensortec.com/media/boschsensortec/downloads/handling_soldering_mounting_instructions/bst-bme280-hs006.pdf), of course with port protection.

Do you have any recommendation what we can use as insulator?
Now we are using CRC Urethan 71 vernis isolant, but not sure it is good.

Thanks

Best reply by BSTRobin

Hi Eugene1215,

Please see below comment for reference,

1, As the description from BME280 HSMI document, we don't recommend total and partial covering the sensor.

If you want to under fill the sensor with gel, should protect the air hole on the sensor surface and keep no gel into the sensor
The performance of the sensor will be influenced with under fill gel

2, Based on the HSMI chapter5.1

If you can use membrane to protect the sensor and pad
If your equipment structure available, you can reference the design from chapter5.1

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