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089770000 Rev 05
Teledyne API N500 CAPS NO
X
Analyzer with NumaView™ Software
89
and compensate for source drift. Using the CAPS technique, the amount of phase shift
remains constant for a given concentration, even if the LED drifts over time. This
measurement approach offers many advantages over traditional (or “Chemi”) analyzers,
such as faster response (single gas stream), lower noise at span, and more importantly,
greater specificity.
CELL
PRESS
N500 OVEN (45 Degree Celsius)
DETECTOR
Sample In
Sample Out
“Cavity Enhanced”
=
Figure 6-1. N500 Optical Absorption Cell
Figure 6-2. Phase Shift Representation of Increased Concentration of NO
2
(Black = LED State, Blue = Light build up in the absence of NO
2
, Green = phase
shifted\attenuated light).
ϑ
Absorbing Gas
LED OFF
LED ON
Содержание N500
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