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Introduction to the Quaternary Pump
Early Maintenance Feedback (EMF)
Early Maintenance Feedback (EMF)Maintenance requires the exchange of components in the flow path which
are subject to mechanical wear or stress. Ideally, the frequenc y at which
components are exchanged should be based on the intensity of usage of the
instrument and the analytical conditions, and not on a predefined time
interval. The early maintenance feedback (EMF) feature monitors the usage
of specific components in the instrument, and provides feedback when the
user-settable limits have been exceeded. The visual feedback in the user
interface provides an indication that maintenance procedures should be
scheduled.
EMF Counters
The quaternary pump provides a series of EMF counters for the pump head.
Each counter increments with pump use, and can be assigned a maximum
limit which provides visual feedback in the user interface when the limit is
exceeded. Each counter can be reset to zero after maintenance has been
done. The quaternary pump provides the following EMF counters:
•Pump Liquimeter
•Pump seal wear
Pump Liquimeter
The pump liquimeter displays the total volume of solvent pumped by the
pump head since the last reset of the counters. The pump liquimeter can be
assigned an EMF (maximum) limit. When the limit is exceeded, the EMF flag
in the user interface is displayed.
Seal Wear Counters
The seal wear counters display a value derived from pressure and flow (both
contribute to seal wear). The values increment with pump usage until the
counters are reset after seal maintenance. Both seal wear counters can be
assigned an EMF (maximum) limit. When the limit is exceeded, the EMF flag
in the user interface is displayed.