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Experimenting with Waterproof Connectors
Blog Enclosure Waterproof Test - Blog 2
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Engagement
  • Author Author: charlieo21
  • Date Created: 28 May 2023 5:09 PM Date Created
  • Views 768 views
  • Likes 7 likes
  • Comments 5 comments
  • experimenting with Waterproof Connectors
  • waterproof
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Enclosure Waterproof Test - Blog 2

charlieo21
charlieo21
28 May 2023

For the initial test, I did put all the connector in the enclosure.

This test is to check how good is the waterproofness on the Hammond enclosure.

image

I wasn't able to get the threaded inserts for the RJ45 hood, so I decided to use J-B Weld for keeping the hood attached to the enclosure.

image

I put a humidity sensor inside the enclosure to check the humidity inside and be able to identify  water ingress.

The sensor was connected using the 4 pin connector to my laptop, I log a measurement every second.

I put the enclosure in a plastic container and I added water until the Hammond enclosure was all submerged in water. 

image

After running the test for more than 2 hours, I checked the graph and I saw a humidity increase around 40 minutes.

image

I found that the water ingress was happening in the 4 pin connector.

image

Because I was using that connector for the humidity sensor with a cable that wasn't meeting the diameter specification on the connector the waterproofness wasn't achieved.

It was my fault and I'll use a proper cable for the following experiments.

All the other connectors achieved the waterproofness needed to pass this test.

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Top Comments

  • charlieo21
    charlieo21 over 2 years ago in reply to JWx +1
    You're right there's a seal between the connector body and the enclosure, but I don't think is good to have unprotected the pins unless you're not going to use them.
  • JWx
    JWx over 2 years ago in reply to charlieo21

    but this is true for all the connectors in my opinion - antenna connectors can also be subject to current leaks and corrosion if not connected but left under voltage I think... But RJ45 contacts are more delicate and easily damaged for sure

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  • charlieo21
    charlieo21 over 2 years ago in reply to JWx

    You're right there's a seal between the connector body and the enclosure, but I don't think is good to have unprotected the pins unless you're not going to use them.

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  • JWx
    JWx over 2 years ago in reply to charlieo21

    are you sure about RJ45? I have found this in datasheet:  "ENVIRONMENTAL PERFORMANCE PER IEC 60529 CODE IP67 FOR SEAL BETWEEN MATING AREA AND PCB SIDE OF CONNECTOR. GASKET PROVIDES SEAL TO INSIDE FACE OF PANEL." - so it seems that there is a IP67 seal inside - and my connector wasn't leaking during (short) submersion, so I have assumed that it is IP67 even unmated...

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  • charlieo21
    charlieo21 over 2 years ago in reply to JWx

    Yes, the RJ45 needs to be in mated condition to achieve the IP67. The 4 pin connectors has its own cap in case of used without the mating connector. In this case I wasn't using the proper cable.

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  • JWx
    JWx over 2 years ago

    This is the only one that is waterproof only in mated condition I think...

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