Model 9090 pages

WESTERN RESEARCH

®

PROCESS INSTRUMENTS

Model 909 Hot/Wet Single Gas
Mass Flow CEM
Benefits
t High reliability and reduced maintenance requirements through a
no-moving-parts design
t Hot/wet analysis prevents errors
associated with:
t

—Correcting for water vapor

tt
—Absorption losses in driers
t Accuracy better than 2.5 ppm SO2
t Able to measure SO2, NO, NO2,
H2S, NH3, or a number of other
chemicals
t No H2O or CO2 interference
t Automated zero and span gas
calibration
t Provides serial interface with plant
DCS
t Incorporates flow measurement
for emission rate calculations

The Need
The AMETEK Western Research®
Model 909 is a single gas version of
our Model 910 Continuous Emissions
Monitor. The analyzer is specifically
configured for monitoring stack
emissions on a mass rate basis. It
measures stack effluent temperature
and velocity in addition to pollutant
concentrations at stack conditions
enabling mass emission rates to be
reported. With the addition of an
optional zirconium oxide sensor, the
Model 909 is capable of monitoring
oxygen.

gas flow management, and probe and
sample line temperature control. The
Model 909 is a full function continuous
emissions monitoring system (CEM)
which requires the addition of only a
sample probe and sample line to be
fully operational.

The Measurement
The Model 909 uses our proprietary
high resolution UV technology in a dual
beam, dual wavelength configuration.
Resolution better than 0.02 nm
is provided by high-intensity line
source lamps. These sources emit
at fixed wavelengths providing great
measurement stability and emit low
total power removing the potential for
sample photolysis. The high resolution
enables unparalleled linearity over a
wide dynamic range, which in turn,
leads to simple, robust data analysis.
The dual beam configuration, combined
with the reference measurement,
ensures low noise performance with
minimal baseline and span drift.

t UV measurements do not suffer
from H2O and CO2 interference as
these species are transparent in the
UV. This greatly simplifies sample
handling. The Model 909 is a fully
extractive, heated wet basis analyzer.
The sample cell and all components
in contact with the sample are heated
above the dew points of all gases in the
sample stream. This results in a simpler
and more accurate calculation of gas
concentrations requiring no corrections
for condensed and dissolved components. It also results in a simpler, more
reliable analytical system as there is no
need for sample drying. The Model 909
has built-in zero and span calibration
and four zone temperature control.

Applications
t CEM applications in:
t —Sulfur plants
t—Smelters
t —Coal, oil and gas-fired power
plants
t —Industrial boilers and process
heaters

t The Model 909 features a nomoving-parts design for maximum
reliability and durability. It is a complete
system with a sample extraction and
transport system designed to ensure
sample integrity. Housing options for
the analyzer include a cabinet or walkin shelter built to your specifications.
t The Model 909 performs all
necessary sample gas and calibration

Model 909 Hot/wet Single Gas Mass Flow CEM

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