barriers for quad encoders

chris2019 · Feb 24, 2004

Hi, Does anyone know where I can get hold of an intrinsically safe barrier that can take a quad output from an encoder?

john paley · Feb 24, 2004

Is the encoder in the explosive zone??

If so you need a barrier on the power supply fed to the encoder, at least, if not also.

Look at STAHL and PEPPREL&FUCHS websites for ideas.

chris2019 · Mar 5, 2004

I tried P&F but they don't seem to have what I'm after. There's plenty of IS encoders out there, but no one seems to do a quadrature barrier to suit. Thanks for the suggestion - I'll give Stahl a go.

karlk · Mar 5, 2004

This must be for a coiled tubing unit. Try MTL Instruments Group. Here is a link to the product page on a differnet site.
www.norex-inst.no/html/MTL700.pdf
The one I used was the MTL786

elevmike · Mar 6, 2004

I dont know of any barriers for encoders, however if your incoder is low voltage, and you have a current limiter on the power supply you may meet the safety requirements.

Here's a good article on intrinsic safety .

elevmike · Mar 6, 2004

Come to think of it Dynapar makes a barrier. I can not find it oun their website, but GALCO shows two part numbers here , but no specs.

Good Luck.

Mike

dash · Mar 6, 2004

BEI makes one that I have used before. See

http://www.beiied.com/pdfs/isb.pdf

chris2019 · Mar 16, 2004

Thanks for everyone's replies. It looks like we'll be going with the BEI unit, it's going to be exactly what we're after.

barriers for quad encoders

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