Introduction
Hardware Installation and Maintenance Manual 1
–5
About the Gas Analyzers
The 2-Pack analyzer system includes tunable diode laser (TDL) absorption
spectrometers operating in the near to short wavelength infrared. Each
compact sensor consists of a TDL light source, sample cell and detector
specifically configured to enable high sensitivity measurement of a particular
component within the presences of other gas phase constituents in the stream.
The sensor is controlled by microprocessor-based electronics with embedded
software that incorporates advanced operational and data processing
algorithms.
Determining the Analyzer Firmware Version
When the analyzer is powered on for the first time, the firmware version will be
shown on the system LCD display for approximately seven seconds. The
firmware version for each analyzer is also listed in the Product/Firmware Matrix
located in the front matter of this manual and on the analyzer calibration
certificate.
Refer to “Powering Up the Analyzer” in the Firmware Manual for the
analyzer operating instructions.
Sample Conditioning System
A sample conditioning system (SCS) has been included with the analyzer. The
SCS has been specifically designed to deliver an optimum sample stream that
is representative of the process systems stream at the time of sampling. Most
2-Pack analyzer systems are configured for use at extractive natural gas
sampling stations.
How the Analyzers Work
The 2-Pack analyzer system employs tunable diode laser absorption spectro-
scopy (TDLAS) to detect the presence of trace substances in process gases.
Absorption spectroscopy is a widely used technique for sensitive trace species
detection. Because the measurement is made in the volume of the gas, the
response is much faster, more accurate and significantly more reliable than
traditional surface-based sensors that are subject to surface contamination.
In its simplest form, a diode laser absorption spectrometer typically consists of
a sample cell with a mirror at one end, and a mirror or window at the opposite
end, through which the laser beam can pass. Refer to Figure 1–1 on page 1–6.
The laser beam enters the cell and reflects off the mirror(s) making one or
more trips through the sample gas and eventually exiting the cell where the
remaining beam intensity is measured by a detector. With the 2-Pack analyzer
The safety of the analyzer is the responsibility of the installer and
the organization he/she represents.
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