8 Maintenanceï€
122 Operation Manual
Early Maintenance Feedback (EMF)
The 8890 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.
Counter types
Counters are provided for injections, runs, and time. Each type is described below.
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:
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.
Run counters increment against the number of runs performed on the GC.
Time counters increment against the GC clock. Changing the GC clock changes the age of
tracked consumables.
Configured front flow path Configured back flow path
Front injector Back injector
Front inlet Back inlet
Column 1 (GC oven) Column 2 (GC oven)
Purged Union / Aux EPC 1 Back detector
Column 3 (GC oven)
Front detector
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