Gas analysis system design issue

AI Thread Summary
A gas analysis system design issue is being discussed, focusing on the challenge of creating a rectangular gas chamber that ensures gas tightness. The system includes a PCB with a gas sensor array and requires a gas chamber that fits on the PCB surface. Traditional circular gas chambers use O-Rings for sealing, but the rectangular design complicates this. The discussion seeks alternative sealing methods to achieve gas tightness without relying on O-Rings. Solutions to this mechanical design challenge are being explored.
alchemist_eng
Hi all,

maybe this is a silly question but I am a newbie in this particular design field. I'm working on a gas analysis system and I'm facing a mechanical design issue. The overall system is made of the electronic board (PCB) with a gas sensors array plus the signal conditioning electronics, a gas chamber on the sensing area and various pneumatic tubes/fittings. The sensors we have choosen are sold with SMD (surface mount) packages so we need a gas chamber that "sits" on the PCB surface (see https://ibb.co/kJtuzF).

Usually gas chambers are circular based in order to include an O-Ring in order to ensure gas tightness but in this case, for design related issues, we need a rectangular based gas chamber. How we can ensure gas tightness with this kind of mechanical geometry? Are there alternative ways than using O-Rings?
Tonio
 
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