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Shurafa

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EN 60529 Ingress Protection (IP Rating)

Hello forum members,

How much do you consider the environmental conditions when selecting and using the condition monitoring hardware at the site, focusing on the IP rating?

Quick reference for those who are not familiar with the IP:

1. http://www.dsmt.com/resources/ip-rating-chart/
2. http://www.enclosurecompany.com/ip-ratings-explained.php

I see many POs specifying IP65 in the facilities around me. The standard area hazardous classification for these facilities vary but many are Class I Div II.

Because of the IP requirements, restrictions are put on purchasing many very good systems. I feel sorry for these products but it is a regulatory aspect of the safety compliance.

What are the regulations in your site and what are your practices?

Regards- Ali M. Al-Shurafa 
Curran919

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I've lost too much equipment to some arse being careless with his maintenance or cleaning routine. If its not at least IP54, I'm not letting it out of my sight. If I am going to be permanently installing something, I'm not going to consider anything less than IP65. Someone will find a way of getting it wet.
Shurafa

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Reply with quote  #3 
My concern is in fact related to gas ingress into the battery compartment or a circuit with a possible source of ignition. Would IP 54 be safe from this aspect based on you bad or good experience?

In past (15 year and earlier) there was a little emphasis on IP ratings (at least to my knowledge here) unlike these days but I'm afraidthat this emphasis might be too conservative. Or maybe it is addressing a genuine risk.

Regards- Ali M. Al-Shurafa
Curran919

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I did a bit of research last week on explosion-proofness, so I'm no expert. In short, the IP ratings are not intended to be used for explosion risk rating, but there is some correlation. I like this wall chart that pretty much covers everything.

The 'protection concepts' lists all the ways that you can ensure that something does not present an ignition source. For instrumentation, this is typically Non-Sparking or Intrinsic Safety. Non-sparking would relate kind of to a hermetically sealed, IP68 sensor. Intrinsically safe just means that even if there is a spark, the amount of energy in the sensor is so low, that it still couldn't ignite a reference explosive mixture. I think that is normally true of piezoelectric accelerometers.

Alternatively, there is also:

  • explosion-proof, where gas may get inside and be ignited, but the explosion will be kept small and not be allowed to ignite gases outside the container.
  • oil immersion, where the entire circuit is submerged in non-conductive mineral oil
  • pressurized, where the container is injected with air/nitrogen, that keeps the flammable gases out.
  • a dozen others that all meet ATEX/CSA requirements for certification.
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