Conformal coating SCD-30

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Mushrooom
 
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Conformal coating SCD-30

Post by Mushrooom »

Hi I am using the SCD-30 - NDIR CO2 Temperature and Humidity Sensor to monitor a mushroom growing environment, the humidity is very high (90%) and I don't expect an un-coated component would last long.

I want to paint the sensor with a conformal coating but I don't know what areas to avoid so that the sensor continues to read CO2, humidity, and temperature.

Is there a drawing that shows areas I should avoid?

Thanks in advance

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adafruit_support_mike
 
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Re: Conformal coating SCD-30

Post by adafruit_support_mike »

Take a look at the Design-in guidelines document:

https://sensirion.com/media/documents/8 ... nes_D1.pdf

It shows the temperature/humidity and CO2 openings on the first page.

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Mushrooom
 
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Re: Conformal coating SCD-30

Post by Mushrooom »

Just wanted to update this post with what I learnt from applying Conformal coating to the SCD-30.

The sensor was in some way damaged or the calibration was thrown off by something about the process. Maybe the solvent fumes from the coating or maybe the black light I used to check coverage of the coating. I read the spec of the SCD-40, different sensor I know, but interestingly it points out how the solvent fumes can cause issues with that sensor. I am presuming the SCD30 is similar.

The conformal coating I used was - 422C Conformal Coating - Silicone with UV Indicator

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adafruit_support_mike
 
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Re: Conformal coating SCD-30

Post by adafruit_support_mike »

Try running the sensor in clean air for a few days.

You're right that the sensing path has probably picked up some VOCs. They should diffuse out over time.

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