Model 9200 pages

WESTERN RESEARCH

®

PROCESS INSTRUMENTS

Model 920 Multi-Gas Analyzer
Benefits
tHot/wet analysis prevents errors
associated with:
t —Correcting for water vapor
t —Absorption losses in driers
tMulti-component analysis (up to
five species)
tMulti-range SO2
tSimultaneous, independent NO
and NO2 measurement
tNo H2O or CO2 interference
tAutomated zero and span
calibration
tSerial communication with plant
DCS

The Analyzer
The AMETEK Process Instruments
Model 920 has been specifically
designed to meet the requirements
of the most challenging process and
emissions monitoring applications
in a cost effective fashion. The
Model 920 is a multi‑component
analyzer capable of measuring up to
five different gases simultaneously.
It, therefore, performs analyses
typically requiring two or more
separate analyzers. The Model 920
is a complete system with a sample
extraction and transport system
designed for maintaining sample
integrity. Housing options for the
analyzer unit include a cabinet
or walk‑in shelter built to client
specifications.
t The simple and robust design of
the Model 920 is complemented by
powerful data processing capabilities.
Both analog and digital outputs are
available, with serial communications
via Modbus protocol being an available
option. An optional oxygen sensor can
be included.
t In process and emission streams,
as a stand‑alone system from probe
to output, the Model 920 is the
standard of excellence and versatility.

high resolution UV technology in
a dual beam, multiple wavelength
configuration. Resolution better than
0.02 nm is provided by high intensity,
line source lamps. These sources
emit at a fixed wavelength, 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
(less than 1% deviation over 4 to
5 orders of magnitude) which, in
turn, leads to simple, robust data
analysis. A six‑position filter wheel
enables one reference and five
measure wavelengths. The dualbeam 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 920 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 analytical system as
there is no need for sample drying
or conditioning. The Model 920 has
built‑in zero and span calibration and
four zone temperature control.

Typical Applications
tPower boiler emissions
monitoring (SO2 and NOx)
tSulfur plant stack and feed gas
monitoring (SO2, H2S, COS)
tMultiple range SO2 monitoring in
sulfuric acid plants (low ppm to
>10%)
tProcess monitoring in nitric acid
plants (NH3 and NOx)
tSmelter stack monitoring
tSulfuric acid plant control
tSCR De-NOx (NOx and
ammonia slip)
tSRU tail gas clean-up (H2S and SO2)
tSRU feed gas (H2S and NH3)
tTiO2 production and stack gas
(H2S, CI2, COS)

The Measurement
The AMETEK Process Instruments
Model 920 uses our proprietary

Model 920 Multi-Gas Analyzer

www.ametekpi.com