SERVOPRO
PRODUCT FOCUS
SERVOPRO
Chroma
A VERSATILE SOLUTION FOR
TRACE GAS ANALYSIS
OPTIMIZABLE FOR
MEDICAL GAS
APPLICATIONS
For medical gas applications, the Chroma
uses TCD to provide a nitrogen assay and
carbon dioxide (CO 2 ) impurity analysis
in nitrous oxide (N 2 O). The Chroma also
delivers impurity analysis of carbon
monoxide (CO) in CO 2 and N 2 O through
FID with a methanizer.
The Chroma nitrogen assay measurement
meets the European Pharmacopeia’s
required concentration limit of greater
than 99.5% purity (the US National
Formulary requirement is slightly less
stringent at 99%).
The European Pharmacopeia required
concentration limit for CO 2 impurity is
less than 300 parts-per-million (ppm) and
for CO impurity is less than 5ppm – the
US National Formulary requires a gas
detector tube for these measurements.
The SERVOPRO Chroma trace gas analyzer
A customizable mainframe analyzer based
around Gas Chromatography technology,
the SERVOPRO Chroma provides one
of the most versatile gas monitoring
solutions available.
It delivers percentage and parts-per-
million (ppm) measurements using Flame
Ionization Detection (FID) and Thermal
Conductivity (TCD) sensing technologies,
and can utilize Servomex’s advanced
Plasma Emissions Detection (PED) for
parts-per-billion (ppb) levels of detection.
One of the most compact and powerful
trace analyzers available to the market,
the Chroma is rack-mountable for easy
integration into a gas analysis system. for remote control and monitoring via a
network or web browser.
It is a standalone device that does not
require third-party software and is
designed to be easy to operate, with an
intuitive user interface and integrated
software providing access to all functions,
measurements and system status. The analyzer’s PlasmaHC system enables
accurate, low-maintenance
measurements of methane and non-
methane hydrocarbons, with no need for
hydrogen fuel.
The Chroma has separate 4-20mA outputs
for each measurement, ensuring peak
impurity values and chromatogram
signals. Comprehensive digital and analog
communications deliver flexible operation,
with internet and Ethernet connectivity
It can also use ArgonSep technology
to separate argon and oxygen without
the requirement for oxygen scrubbers,
providing a highly sensitive and
maintenance-free measurement.
SERVOPRO Chroma OVERVIEW
MEASURES
BACKGROUND GASES KEY APPLICATIONS
Medical gas production
Medical gas verification
Air separation plants
The Chroma is ideal for many medical gas purity applications
GAS CHROMATOGRAPHY
Gas Chromatography (GC) is an
exceptionally accurate method of
separating gas mixtures, measuring
concentrations down to parts-per-billion
(ppb) levels.
It is well suited for use in high-purity
processes such as medical gas purity
analysis since, unlike most gas analysis
techniques, the measurement is made
once the sample has been separated
rather than within the sample. By
circulating a gas sample, the individual
gases are separated using an inert
carrier gas, such as helium or argon. This
mobile phase flows through a tubular
column, where the component gases are
separated due to their interaction with
the stationary phase.
The gas content is quantified by a
detector at the column outlet measuring
the retention times of specific molecules
as they bind to the column material at
different rates. Each gas type elutes after
a different retention time in the column.
Gas types are identified by the order in
which they elute from the column.
GC process conditions can be varied to
suit a variety of applications. The column
temperature may be altered, as can the
carrier gas flow rates, sample loop size
and the dimensions of the column itself.
FLAME IONIZATION DETECTOR THERMAL CONDUCTIVITY DETECTOR
The FID sensor works on the principle of detecting ions
formed in the combustion of organic compounds in a
sample, producing charged molecules that cause electrical
conduction between two electrodes. The ions are attracted
to a collector plate and induce a current upon hitting the
plate. The FID measures this conduction and produces an
output which is directly proportional to the concentration
of Total Hydrocarbons (THC) in the sample. Using a
methanizer, this technology can be also used to measure
very low concentrations of CO. The Chroma’s Thermal Conductivity Detector consists of an
electrically heated Wheatstone bridge in a temperature-
controlled cell. Helium is passed over the reference arm of
the bridge and the column effluent passes over the sample
arm of the bridge. When the column effluent is helium
carrier gas, the heat loss from the sample arm of the bridge
matches the heat loss from the reference arm. When an
analyte elutes this affects the thermal conductivity of the
effluent and will change the heat loss from the sample
arm of the bridge, and hence its electrical resistance. This
change is measured as a signal.
Argon purification plants
Cryogenic truck-loading station
Hydrogen purification plants
Specialty gas laboratories
Semiconductor plants
Helium liquefaction plants
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ENSURE A FULL LIFETIME OF PERFORMANCE
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