Gas sensing
17405 for CO2 and EN ISO 21258 for N2O. For the measurement of CO2 and N2O, Non Dispersive Infra-Red (NDIR) is the standard reference method (SRM).
Calibration CEMS can be calibrated with standard gases, but the best way to reduce uncertainty in GHG measurements is to run an NDIR analyser in the measurement of the actual sample gas. Alternatively, an NDIR analyser could be installed to provide continuous GHG measurements; thereby employing the SRM. NDIR analysers utilise a spectrophotometer with specificity for individual gases. Signal Group for example, manufactures NDIR analysers with
a dual parameter capability for CO2 and N2O in one enclosure. This analyser has individual gas sample cells that have a measuring range (cell length) designed specifically for the measured gas and range. NDIR analysers with Gas Filter Correlation, such as the Signal ‘Pulsar’ range, provide extremely high levels of specificity to the gas being measured, because they use the target gas as an optical filter. Consequently, all of the wavelength in the IR spectrum that this gas absorbs will be removed from the spectrum, leaving a perfect reference with which to compare the sample absorption. As a result, there can be no cross-interference from other gases in the sample – such as H2O for example.
Obviously condensation inside any analyser
is to be avoided, but freedom from H2O interference in the measurement method, is of
particular importance, and means that the Signal Pulsar can operate with any non- condensing sample. Conveniently, the latest development in the
Pulsar analyser range is a built-in IP address, which means that users can connect with their analysers at any time from anywhere. Alternatively, if the data needs to be available to on-site personnel, the Signal analysers now have a detachable tablet which can connect with the analyser using its built-in WiFi. This
means that whilst the analyser may be located in an inconvenient location, the user can connect with it from the comfort and safety of somewhere nearby. In summary, as the world increasingly seeks
to implement measures to fight climate change, the requirement for accurate GHG emissions monitoring will increase as organisations seek to lower their carbon footprint and comply with the inevitable regulatory requirements.
Signal Group
www.signal-group.com
New demands for enhanced
Greenhouse Gas monitoring
Instrumentation Monthly June 2021 39
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