Forney Corporation
UNIFLAME User’s Manual
Publication 372000-48 Rev H
5.2.2.1.1 AUTOTUNE SETPOINTS DEFINED
Aim Detector
Pressing the SELECT key causes, “Ix Ux” to appear (MultiSpectral Models only). The value of “x” may
range from 0 to 60. The value displayed represents the intensity of the flame for the entire band (flicker
frequency spectrum) as individually sensed by the IR (Ix) sensor and/or UV (Ux) sensor(s).
The numbers should be at their peak (highest numerically) when the detector is aimed at the primary
combustion zone (first 1/3) of the flame
. If the detector is equipped with both an IR and UV sensor,
priority should be given to maximize the UV intensity.
Run the flame at a low firing rate and observe the signal level. Maximize the intensity reading if signals
are low by adjusting the swivel mount or the detector’s sighting. (Allow the detector to stabilize two
seconds after each movement.)
If the reading is 10 or less, the intensity is marginal. Verify that the appropriate sensor “Range” parameter
(IR Range or UV Range) in the EDIT Mode is set to “High” (see IRRange or UVRange in EDIT mode
section).
If the reading is greater than 26 (the number will blink), the signal is excessive. Verify that the
appropriate sensor “Range” parameter (IR Range or UV Range) in the EDIT Mode is set to “Low” (see
IRRange or UVRange in EDIT mode section).
Learn ON
Run the flame at a normally operational low flame condition (e.g. low load, low O
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) and press the
PROGRAM key. The detector will display “Wait” followed by a number that will count down from 128
to 0 in about 20 seconds. This will temporarily store the spectrum of the monitored flame and adjacent
flames. The front end gain number, used in the ON/OFF calculation, will be stored at this time.
Learn OFF
Turn off the monitored flame, leaving adjacent flames operating in a normally operational strong
background condition (e.g. high load) and press the PROGRAM key. The detector will display “Wait”,
followed by a number that will count down from 128 to 0 in about 20 seconds. This will temporarily store
the spectrum of the adjacent flames.
The “ON” spectrum will then be compared to the “OFF” spectrum and the frequency and gain for
optimum discrimination will be selected.
The IR and UV gain settings will be automatically selected based on the proportionality of their flame
ON:OFF ratios. In MultiSpectral models, the contribution of the IR and UV Signal Strengths to the Flame
Quality is determined by the selection of their respective gain numbers. The gain settings will be selected
to yield a total “Signal Strength” of between 100 and 150.
The flame relay ON and OFF Thresholds will be automatically set to 40 and 20, respectively, unless the
“background” signal level is exceptionally high, which usually indicates poor aiming of the detector.
If, after learning Flame OFF, a sufficient on/off ratio was not found in at least one sensor, the display will
show “Warning: Poor discrimination, try re-aiming the detector”.
--EXIT—
Pressing the SELECT key will return the user to the AUTOTUNE mode in the STATUS LOOP.
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