Agilent Technologies 1100 Series, Service Manual, Page: 218 / 288

206 1100 Series Nano Pump Service Manual
5 Introduction to the Nano Pump
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.
Using the EMF Counters
The user-settable EMF limits for the EMF counters enable the early
maintenance feedback to be adapted to specific user requirements. The wear
of pump components is dependent on the analytical conditions, therefore, the
definition of the maximum limits need to be determined based on the specific
operating conditions of the instrument.
Setting the EMF Limits
The setting of the EMF limits must be optimized over one or two maintenance
cycles. Initially, no EMF limit should be set. When performance indicates
maintenance is necessary, take note of the values displayed by liquimeters and
seal wear counters. Enter these values (or values slightly less than the
displayed values) as EMF limits, and then reset the EMF counters to zero. The
next time the EMF counters exceed the new EMF limits, the EMF flag will be
displayed, providing a reminder that maintenance needs to be scheduled.