Model 46600 pages

WESTERN RESEARCH

®

PROCESS INSTRUMENTS

Model 4660 Low Concentration H2S Analyzer
Superior Benefits

The Need

►tNo moving parts

The need for the measurement of low level H2S in sales gas is important both

►tNo lead compound
impregnated tape disposal

provide safety margin drastically increases the operating costs of removal

►tTemperature-controlled
environment not required
►tLocal or remotely mounted
controller
►tElectronic zero and span

for corrosion control and personal safety. Reducing the level excessively to
and recovery operation whereas high levels of H2S will result in costly plant
shutdowns.
t In the case of refinery fuel gas or absorber overheads, the measurement
is mandated by various environmental protection agencies. The technology
of measurement allows the AMETEK Western Research Model 4660 to be
installed on various process streams and is virtually interference free from
other species present in the gas.

►tSolid state detector

t No matter what your measurements needs are, the Model 4660 is field

►tMicroprocessor-based
electronics

proven with numerous installations worldwide and is backed by AMETEK

►tSplit beam technology
►tUnsurpassed long-term
accuracy
►tMulti-point sampling
►tFully accepted by USEPA 40
CFR 60
►tNo saturator to maintain

Western Research worldwide support.

Principle of Measurement
AMETEK Western Research Model 4660 utilizes ultraviolet (UV) light-based
technology for accurate measurement of low levels of H2S. The sample system
is designed to completely convert the H2S into (NH4)2S. The concentration
of (NH4)2S is then measured with the photometer and is correlated back to
the H2S concentration. This principle of indirect measurement gives precise
measurement and eliminates any possible interferences from unsaturated and
aromatic hydrocarbons present in the process stream. The need for costly and
maintenance intensive lead acetate tape spools are also eliminated.

►tNo out-of-service period due
to overload saturation
►tRemote dial-in facility via
modem

Applications
►tSales (natural) gas
►tRefinery fuel gas

Model 4660
Low Concentration
H2S Analyzer

►tAbsorber overhead gas
►tHydrogen recycle gas
►tOther process streams

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