Enclosure with Air Purge Regulator

JRoss · Jun 7, 2012

Hey everybody. I am doing a proposal for a customer, and one of the requirements he's given me is for a "NEMA 12 panel with air purge regulator". I've asked for clarification, but from my searches, it looks like air purging of an enclosure is related to explosion proofing. Any ideas? Any product suggestions?

Thanks,
Jeremy

George Graziano · Jun 7, 2012

Jeremy,

This purges and cools. Just make sure you get a seperate temperature switch & solenoid to control air.

http://www.exair.com/en-US/Primary ...binet Coolers/Pages/Cabinet Coolers Home.aspx

George

tspisak · Jun 7, 2012

Is the panel for a hazardous area (gas or dust) or are they just trying to keep the inside of the enclosure clean? If the panel is going in a hazardous area you should have designations like "Class I, Division 2, Group D" listed.
Panel purge kits for this type of application can be purchased from Bebco (now pepperl-fuchs).

Mickey · Jun 7, 2012

Also make sure the customer has clean dry instrument air and lots of it.

danw · Jun 7, 2012

Hoffman has a whole catalog chapter on EXP panels, part of which is air purging.

The web page and catalog can be a tutorial, if the issue is hazardous area approval

http://www.hoffmanonline.com/produc...tID=2455&SelectCatID=2455&cat_1=34&cat_2=2455

rdrast · Jun 8, 2012

A purge/relief system like above is a good idea; believe it or not, inert gas or air purging of enclosures can actually be tricky.

Even when using a premade purge system, I still insist on installing a low pressure blowoff device on the enclosure to prevent too much pressure build up (usually 2psi or under).

Enclosure with Air Purge Regulator

JRoss

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