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HDC3020-Q1: HDC3020-Q1

Udi Kirmayer
Prodigy 10 points
Part Number: HDC3020-Q1

Hi,

I would like to use the HDC3020-Q1 to sense external Humidity

Im planning to attach it to a panel with a sealing rubber between the sensor and the panel

are there any guidelines to do it:

  • Pressure I can apply on the sensor to seal it against the panel
  • Diameter of hole in panel
  • Panel max thickness

Thanks,

Udi K

  • 0
    TI__Expert 6380 points

    Hi Udi,

    I would like to link you to this app note: Optimizing Placement and Routing for Humidity Sensors. This app note details how to orient a humidity sensor in an enclosed environment, you may find it helpful. For your specific application, I think this would work just fine. 

    For the diameter of the hole, there isn't a specific size to target. The hole being roughly the same width as the center cavity would work well. For reference, when we test these devices internally in sockets, the sockets have an air hole that is smaller than the sensor cavity size and the HDC3s will read RH just fine. For both the panel thickness (gap between air and the sensor) and hole size, what is really being affected is RH response time. The smaller the hole in the panel and the thicker the panel, the longer the response time will be since the humid air is getting to the device at a slower rate. I don't have an exact number it would change by, but I would expect the 63% rise time to increase by at least a few seconds. If your application needs a very fast/responsive sensor, I would make the panel thickness low and the hole as wide as the sensor cavity.

    I don't have a specific amount of pressure you can apply to the part to press it into the panel, so lease use as little as possible since increased pressure can only make the performance worse. When you are pressing this, is there going to be an adhesive used to hold it against the panel?

    Thanks

    -Alex Thompson