Typical column switching systems straight on backflush Siemens

Typical column switching systems straight on backflush Siemens Advanced Engineering Pte Ltd Process Analytical Services Division backflush summation cut distribution one detector two detectors PAS-Intro 1 Dated 24 th Aug 1999 Copyright © Siemens AG 1999 All Rights Reserved

Typical valve switching system Valve types: n 6 -port n 10 -port n diaphragm n slider n rotary Siemens Advanced Engineering Pte Ltd Process Analytical Services Division PAS-Intro 1 Dated 24 th Aug 1999 Copyright © Siemens AG 1999 All Rights Reserved

Illustration of „Live“ column switching 1. Two columns coupled in series Siemens Advanced Engineering Pte Ltd Process Analytical Services Division PAS-Intro 1 Dated 24 th Aug 1999 Copyright © Siemens AG 1999 All Rights Reserved

Illustration of „Live“ column switching Live - Cut mode Siemens Advanced Engineering Pte Ltd Process Analytical Services Division PAS-Intro 1 Dated 24 th Aug 1999 Copyright © Siemens AG 1999 All Rights Reserved

Illustration of „Live“ column switching Live - Straight on mode Siemens Advanced Engineering Pte Ltd Process Analytical Services Division PAS-Intro 1 Dated 24 th Aug 1999 Copyright © Siemens AG 1999 All Rights Reserved

Illustration of „Live“ column switching The complete system Siemens Advanced Engineering Pte Ltd Process Analytical Services Division PAS-Intro 1 Dated 24 th Aug 1999 Copyright © Siemens AG 1999 All Rights Reserved

Column switching with valves or „valveless“ -a comparison of the advantages Valves n Costs n Ease of Installation n Ease of Operation „valveless“ n Prevention of peak broadening n Prevention of memory effects n Inertness n Speed of switching n Availability / maintenance efforts n Suitability for capillary GC n Suitability for high temperature GC Siemens Advanced Engineering Pte Ltd Process Analytical Services Division PAS-Intro 1 Dated 24 th Aug 1999 Copyright © Siemens AG 1999 All Rights Reserved