16 1200 Series DAD and MWD User Manual
1 Introduction to the Detector
Early Maintenance Feedback (EMF)
Maintenance requires the exchange of components which are subject to wear
or stress. Ideally, the frequency at which components are exchanged should be
based on the intensity of usage of the detector 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-selectable limits have been exceeded. The
visual feedback in the user interface provides an indication that maintenance
procedures should be scheduled.
EMF Counters
The detector provides two EMF counters for the lamps. The counters
increment increments with lamp use, and can be assigned a maximum limit
which provides visual feedback in the user interface when the limit is
exceeded. The counters can be reset to zero after the lamp is exchanged. The
detector provides the following EMF counters:
• Deuterium Lamp On-Time
• Tungsten Lamp On-Time
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 useful
lamp burn time is dependent on the requirements for the analysis (high or low
sensitivity analysis, wavelength etc.), therefore, the definition of the maximum
limits need to be determined based on the specific operating conditions of the
instrument.
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