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ASDevices > Products > Supporting accessories > Sample stream selection system (S4)
Supporting accessories

Sample stream selection system (S4)

Unsurpassed sample integrity

We know that sampling system quality greatly impacts analytical system performance. That’s why for over three decades, we’ve been designing only the best sampling solutions, like our innovative sample stream selection system (S4) with our proprietary purge leap sealing valve (PLSV) that delivers unsurpassed sample integrity.


  • Based on purge lip sealing valve (PLSV) technology
  • PLSV technology eliminates cross-port leaks
  • 2, 4, 6 and 8 sample inlet versions available
  • Manual, automatic or remote control
  • No dead or unswept volume
  • Stand-alone or integrated with GC platform

Typical applications

  • Industrial gas sampling
  • UHP gas sampling
  • Electronics gas sampling
  • Reference or calibration gas sampling
  • Fence line monitoring


PLSV technology benefits

With PLSV technology’s unique purged system, one sample simply cannot contaminate the other, so it virtually eradicates cross-port leaks. The system offers many other benefits as well, such as preserving sample integrity by preventing atmospheric air from entering the valve and contaminating the sample. In some applications, it even lets you keep an inert atmosphere around the sample ports.



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  • Trapping temperature down to –30 ˚C and release temperature up to 300 ˚C
  • Unsurpassed leak integrity by design, optimized for high sensitivity detector
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Use our sonic orifice base dilution system to accurately prepare reference gas standards

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  • Inert flow path design (optional)
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Designed to be top-mounted on our GC platforms, saving you valuable bench space.

  • Programmable injection volume
  • Gas-tight heated syringe
  • Robust rotating head
  • Vial leakage check and system integrity test
  • Available for headspace, liquid or all-in-one
Learn more

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