SS1000 Operator’s Manual
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SpectraSensors Overview
SpectraSensors, Inc. (SSI) is a leading manufacturer of state-of-the-art
electro-optic gas analyzers for the industrial process, gas distribution and
environmental monitoring markets. Headquartered in Houston, Texas, SSI was
incorporated in 1999 as a spin-off of the NASA/Caltech Jet Propulsion
Laboratory (JPL) with the purpose of commercializing space-proven
measurement technologies initially developed at JPL.
About the Gas Analyzers
The SS1000 is a tunable diode laser (TDL) absorption spectrometers operating
in the near- (IR-A, 0.75
–
1.4 µm) to short-wavelength infrared (IR-B, 1.4
–
3
µm). Each compact sensor consists of a TDL light source, sample cell and
detector specifically configured to enable high sensitivity measurement of a
particular component in 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.
An appropriate sample conditioning system may also be included with the
system that has been specifically designed to deliver an optimum sample
stream that is representative of the process stream at the time of sampling.
Most SS1000 analyzer systems are configured for use at extractive natural gas
sampling stations.
How the Analyzer Works
The SS1000 analyzer employs tunable diode laser absorption spectroscopy
(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 other
through which the laser beam can pass, as shown in Figure 1–1. 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 SS1000 analyzers, sample
gas flows continuously through the sample cell ensuring that the sample is
always representative of the flow in the main pipe.
If equipment is used in a manner not specified by the
manufacturer, the protection provided by the manufacturer may
be impaired.
UK Distibution by IMA Ltd
Tel: +44 (0)1943 878877 Email: [email protected] Web: www.ima.co.uk