StoreX
Series
STX_V078.doc
17
CMa,
23.11.2009
Principle of Operation
The infra-red spectra of many gases are characterized by narrow, non-
overlapping absorption bands. Thus, the measurement of absorption within a
defined wavelength band can uniquely identify the presence and concentration of
a particular gas.
In NDIR gas sensors, an infrared optical 'sample' filter with a narrow band of
transmission is selected to overlap with the absorption band of interest, the
position of the filter determines which gas will be measured and the amount of
absorption determines the gas concentration present
.
The infrared filter is chosen to ensure that the sensor is totally gas specific and
will not exhibit cross sensitivity to other gases.
Specifications
Measuring Range
0..10 % Vol.
Input Pressure
2
8
bar typ.
bar max.
Gas Flow
~10 l/min max.
Gas Consumption @ 5% CO2, 37°C S
<1
~7
~18
l/h standby
l/h 2-min.-access cycles
l/h 30sec.-access cycles
Measuring Wavelength
4200 nm
Accuracy ±3
%
FS
Stability
±5 % over 12 month
Repeatability ±0.5
% at zero
% at full scale
Response Time
~30 s
Warm-Up Time
5
30
min. operation
min full accuracy
MTBF 5
years
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