How is valve timing optimized on the Lachat QC8500 FIA when running more than one channel at a time?

Dokument-ID

Dokument-ID TE5439

Veröffentlichungsdatum

Veröffentlichungsdatum 12.01.2022
Frage
How is valve timing optimized on the Lachat QC8500 FIA when running more than one channel at a time?
Zusammenfassung

Multi-channel valve timing

Antwort
Running multiple channels together requires some additional considerations when optimizing valve timing. This is primarily because the turning of the valve on the first channel will have an effect on the timing to the valve of subsequent channels.
  • For multiple channel methods set time to valve for one channel at a time. Start with the first valve being used. So if channel 1 is included it would be timed first. Use the How is valve timing optimized on the Lachat QC8500 FIA to perform this.
  • Additional channels - Once time to valve for the first valve is entered is determined and entered set time to valve for the next valve being used. Time to valve may not be exact so it is important to be aware that a small amount of dye may get past the first valve. This must be ignored when timing later valves. The main slug of dye which will pass through the sample loop of the previous channel before reaching port 6 of the subsequent valve is what must be timed.
  • Sample period - Each method will have its own sample period. Once time to valve is set for all of the channels in the method verify that each loop is still full of dye when the valves turn to inject. If it is noticed that the dye runs out before the last valve turns to inject sample period will need to be increased. Starting with a large sample period may result in plenty of dye flowing through the valves after the last valve turns to inject. In this case the sample period can be decreased.

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