32 Agilent 1200 Series Valves
3 Maintenance, Repair, and Troubleshooting
Maintenance and Repair
Early Maintenance Feedback (EMF)
Depending on the application the valve will perform many thousands of
actuations without any visible signs of wear. In order to minimize downtime
the Agilent ChemStation offers Early Maintenance Feedback (EMF) for the
Agilent 1200 Series valves. EMF monitors the number of switches of the
Agilent 1200 Series valves, and provides feedback when a user-settable limit is
exceeded. The visual feedback in the graphical user interface provides an
indication, that the exchange of the stator face and/or the rotor seal should be
scheduled.
In the Diagnostics view you can define, after how many valve switches the
stator face and/or the rotor seal should be replaced. The setting for the EMF
limit depends on analytical conditions, e.g. use of buffer solutions. Hence the
setting should be optimized over one or two maintenance cycles.
Setting the EMF limit
1 Switch to the Diagnostics View of the ChemStation.
2 Click on the EMF icon. The EMF Info Pad (Figure 12) will appear on the right
panel of the user interface.
3 Select a valve on the dropdown list of the EMF Info Pad.
4 Enter the EMF limit and click on Send Changes.
Figure 12 Early Maintenance Feedback (EMF)
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