Fireye InSight 4 Series, Manual, Page: 30 / 59

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Front End Gain
The InSight Series 4 scanner has automatic gain control circuitry that continuously adjusts the scanner's
Front End Gain (FEG). The purpose is to keep the raw flame signal within measurable limits. The FEG
value can range from 5 to 255. The current "real-time" Front End Gain value is displayed on this screen.
The “real-time” FEG can be tracked via the 4-20mA analog output. Refer to Config Menu.
With a very weak dim flame (or in darkness) the automatic gain control circuit would increase the FEG,
(up to a maximum value of 255). With a very bright flame, the automatic gain control would decrease
the FEG, (down to a minimum value of 5).
The scanner stores the current real-time FEG value any time a Learn Flame ON procedure is
performed.
To assist in proper flame discrimination, the Flame Quality number will be
automatically reduced whenever the real-time FEG value is higher than the Learned FEG
value.
Example: If the Learned FEG value was 20, and the real-time FEG is now 40, (indicating a dimmer
flame), the scanner will decrease the Flame Quality number by 50% (20/40). However, if the Learned
FEG value was 20, and the real-time FEG is now 10, (indicating a brighter flame), the Flame Quality
number will not be affected.
Select To Enter Error History
Press Select Key to enter the Error History screen to view error status and codes. The most recent
Error is displayed first. It also tells the NUMBER of errors that have occurred to date. The date and
time of each error is displayed along with the Caller and Reason number. The Error menu displays
the last 10 errors, then cycles back around to the top level. In the event that an internal scanner fault
is detected, the scanner will turn off its output and an error code will appear on the display.
To clear the error code and restart the scanner, either the 24 Vdc power can be cycled off then on, or
the PROGRAM key can be depressed and held for four (4) seconds.
Note: Depressing and Holding the PROGRAM key for four (4) seconds will cause the scanner to
RESET (flame relays and fault relay will de-energize). Normal operation will resume once the
PROGRAM button is released. (FACTORY RESET)