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8
Early Maintenance Feedback
Early Maintenance Feedback (EMF)
Counter types
120
The 7890B provides injection- and time- based counters for
various consumable and maintenance parts. Use these
counters to track usage and replace or recondition these
items before potential degradation impacts the
chromatographic results.
If using an Agilent data system, these counters can be set
and reset from within the data system.
Injection counters increment whenever an injection occurs
on the GC via an ALS injector, headspace sampler, or
sampling valve. Manual injections do not increment counters.
The GC differentiates between front and back injections, and
only increments counters associated with the configured
injection flow path.
For example, consider the following GC:
Configured front flow path
Front injector
Front inlet
Column 1 (GC oven)
Purged Union / Aux EPC 1
Column 3 (GC oven)
Front detector
In this example, for a front ALS injection, the GC will
increment counters for the front injector, front inlet, and the
front detector, but it would not increment the back injector,
back inlet, or back detector counters. For the columns, the
GC would increment the injection counters for columns 1
and 3, and the oven cycles counter for all 3 columns.
Time counters increment against the GC clock. Changing the
GC clock changes the age of tracked consumables.
Configured back flow path
Back injector
Back inlet
Column 2 (GC oven)
Back detector
Operation Manual
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