What is the troubleshooting procedure for verifying valve timing on a Lachat QC8500 Flow Injection Analyzer?

Dokument-ID

Dokument-ID TE12349

Veröffentlichungsdatum

Veröffentlichungsdatum 04.03.2020
Frage
What is the troubleshooting procedure for verifying valve timing on a Lachat QC8500 Flow Injection Analyzer?
Zusammenfassung
Instructions for verifying valve timing as a troubleshooting step.
Antwort
Timing is one of the variables that can affect peak area. This technique is often used to troubleshoot small peaks.

Remove the sample line with or without the probe from the auto sampler and leave it in a high concentration standard to continuously draw standard for several injections. Because the standard is drawn continuosly, timing is removed as a variable in peak area and the peaks are expected to increase to their optimal size.

If placing the probe/sample line in the standard results in better peaks, then that would indicate that timing is the cause of the small peaks. If placing the probe/sample line in the standard does not improve the peak area, then timing can be eliminated as a potential cause of the small peaks.

This picture shows where the sample lines can be connected with or without the probe:


This picture shows the sample line with probe resting in a vial of standard:


This picture shows a sample line alone resting in a vial of sample:


Note this is not the correct way to check valve timing for the purpose of optimizing valve timing, but instead a simple check as a troubleshooting step. This articles provides information on optimizing valve timing: How is valve timing optimized on the Lachat QC8500 FIA?

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