The gasses are not corrosive. and the price matters. suggesting brands, models or only the appropriate specifications will help me.
Dear Vahid,
My colleague William Winniford is also on Researchgate, but probably not watching this particular question. If you send William (or as we call him "Bill" ) a note through Researchgate perhaps he can advise you -- I think he has assembled a fair number of instruments with components like these during his career.
Just a suggestion in case your original post doesn't find the answer you need.
Best regards,
Mike Bender
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