Multiple Atex Certification 1

[ironopolis]

Hello,
I've seen this before but not taken much notice of it, but I got a quote through from Emerson for a 3051T pressure transmitter and it has multiple Atex codes. Can be used on Ex d, Ex ia and Ex n. How can this be? Am I being stupid (probably)?
Thanks
Lee

 

[itsmoked]

You're being stoopid.

That just means it meets those various requirements at the same time. For instance, it's intrinsically safe as it can't store energy or fail flaming with one part failure while at the same time it can be housed in an explosion proof case that it could actually explode in and not ignite a surrounding hazardous atmosphere.

If a company can pull that off with a single product it will for obvious reasons.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[ScottyUK]

Expanding a little -

Ex 'd' certification is primarily a function of the enclosure design

Ex 'i' certification is primarily a function of circuit design

Ex 'n' is arguably just good design with a certificate to prove it. ;-)


Ironopolis... just off Marton Road?

 

[ironopolis]

Wouldn't an Ex ia have limitations on it, circuit wise, that an Ex d would not? i.e. my output from my DCS is not current limited or via a barrier.

Lee
UTB

 

[ScottyUK]

Yes, you'd have to match it up with a suitable barrier or isolator taking in to account the device and cable characteristics. Ex 'd' is a device-level protection technique, where Ex 'i' is a system-level protection technique in which the device in the zone is one component, the cable is another, and the barrier/isolator is another. In the latter case the three have to be selected to work together to provide an intrinsically safe system, where an Ex 'd' device with a suitable gland can be connected to pretty much anything you want.

I'm a missionary from the Church of St. James (Park) ;-)

 

[ironopolis]

Sorry for the late response, been away for a few days.

Cheers Scotty, I was getting there slowly but that explanation was great.

St James park, I haven't been there for years. Looking forward to the new season.

Lee.

 

[ScottyUK]

If you're working with a lot of hazardous area stuff then the Compex Design Engineer course is worth considering if your employer will pay for it. I did mine last year at Roxby on Smiths Dock (no affiliation) and it was both interesting and challenging.

Wonder if Boro and the Toon will meet in a couple of years time? Hopefully we won't just swap places in nine months. In the meantime enjoy your visit to the Dark Place up the coast this season. ;-)