Teledyne 9700 - Flue gas analysis system - Manual (Page 8)

4
General Information Model 9700
TELEDYNE BROWN ENGINEERING
Analytical Instruments
3 Oxygen Analyzer Section
The analysis system (see Figure 3) employs a Model 326B Analyzer
which features a TBE/AI unique, patented Micro-Fuel Cell oxygen sensor.
This electrochemical transducer provides an electrical signal that is directly
proportional (and specific) to the oxygen concentration in the gas phase
immediately adjacent to its sensing surface.
The analyzer is capable of oxygen measurements as small as 0.05%
and is unaffected by flow rate changes. Since the sensor is incapable of
producing a significant electrical signal without the presence of oxygen,
any measurable signal produced is “specific” to oxygen.
The Micro-Fuel Cell is completely enclosed, maintenance-free, and
has a predictable life span that is covered by warranty. When the cell is
expended, it is discarded in the same fashion as a worn-out flashlight
battery. TBE/AI’s extensive line of Micro-Fuel Cell equipped oxygen-
measuring instruments are all designed so that the sensor cell can be
replaced in a matter of moments by nontechnical personnel without the use
of tools.
3 .1 Standard Features
The oxygen analyzer is housed in a fiberglass equipment case de-
signed to resist the invasion of moisture and dust. The following features
are standard in the Model 326B analyzer:
• Three Ranges of Analysis
Three ranges of analysis are offered 0–5% (Lo), 0–10%
(MED), and 0–25% (HI). Range control is achieved through the
positioning of a panel-mounted RANGE selector switch; the
switch also controls the power on/off to the analyzer. Since one
of the three available ranges of analysis is always 0–25% O
2
.
ambient atmospheric air (20.9% O
2
) can always be used to
calibrate the analyzer. A CAL mark on the oxygen meter scale
facilitates calibration. (Although the ranges selected best cover
the oxygen content of flue gas, any three ranges of analysis,
from 0–1% to 0–100%, can be provided. )