1-2 | Model 888 ATEX IECEx Tail Gas Analyzer
Electronics Enclosure
Figure 1-2. Electronics Enclosure - Zone 1
Photometer
This analyzer uses a photometer to monitor the concentration of H
2
S and
SO
2
in a tail gas sample. A photometer is composed four main compo-
nents: (1) a source of EM radiation (or “light”) in the desired wavelength
region; (2) a measuring cell with windows capable of transmitting light in
the desired wavelength region and compatible with the sample composi-
tion; (3) a wavelength selection device to isolate the desired wavelength
region; and (4) a detector (or sensor) that is sensitive to the wavelength
region.
4
B
4
3 2
SENSOR PCB ASSEMBLY
PURGE VENT
@I
W
PURGE CONTROLLER
HOST DISPLAY PCB
DETECTOR ASSEMBLY
HOST DISPLAY BATTERY
AC/DC CONVERTER PCB
LINE FILTER
t::ll
24 VOLT POWER SUPPLY
FLASH LAMP POWER SUPPLY
FLASH LAMP
TEMPERATURE SIGNAL CONVERTER (SIL2)
PRESSURE TRANSDUCER
I .i
ik I
HEATER RELA Y
3
+
0
PROPORTIONAL VALVE
2
1
A
1
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