Figure 13-11: Gfc Light Mask - Teledyne T300 Operation Manual

Teledyne API – Model T300/T300M CO Analyzer
06864B DCN6314
other photo emitters/detectors.
detector mounted so that the light emitted by the LED shines through the same mask on
the GFC Wheel that chops the IR beam.
KEY:
Detection Beam shining
through MEASUREMENT
side of GFC Wheel
Detection Beam shining
through REFERENCE side
of GFC Wheel
IR Detection Ring
Segment Sensor Ring
M/R Sensor Ring
M/R S
ENSOR
This emitter/detector assembly produces a signal that shines through a portion of the
mask that allows light to pass for half of a full revolution of the wheel. The resulting
light signal tells the analyzer whether the IR beam is shining through the measurement
or the reference side of the GFC Wheel.
S S
EGMENT ENSOR
Light from this emitter/detector pair shines through a portion of the mask that is divided
into the same number of segments as the IR detector ring.
synchronous/demodulation circuitry of the analyzer to latch onto the most stable part of
each measurement and reference IR pulse.
These devices consist of a combination LED and

Figure 13-11: GFC Light Mask

Theory of Operation
It is used by the
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