Precision – Allan Variance The Spectronus provides simultaneous measurements of multiple greenhouse gas species with high repeatability and excellent reproducibility without the need for frequent gas calibrations. The analyser consists of separate subsystems under the control of a single computer program. The sample handling subsystem automatically carries out all sample handling, inlet sample stream selection, cell evacuation and flushing procedures. It includes a multichannel digital IO switching capability for switching solenoid valves, and an 8 channel analogue/digital converter for logging environmental variables such as temperatures, pressures and flows. The FTIR spectrometer produces and records the interferogram and then performs Fourier Transformation in order to obtain the infrared spectrum of sampled air. This Spectrometer is a Bruker IR cube fitted with a thermoelectrically-cooled MCT (Mercury Cadmium Telluride) detector (wavenumber range 1800-7800 cm -1 ). The IR cube is coupled to a 24 or 26 metre multi pass gas cell that contains the air to be analysed. The spectrum analyser provides quantitative analysis of measured spectra immediately after collection, with realtime display. Logging of analysed concentrations, analysis parameters and analogue input quantities to a SQL database and optional CSV text file is performed continuously. TRAINING AND SUPPORT ECOTECH offers comprehensive training packages to ensure that you receive the best possible advice and support for using our equipment. Our options include extended warranty packages, onsite training and remote login to help with installation and training. Speak to our team to tailor a package to suit your needs.
Figure 12. Allan deviation for CO, CH 4 , CO 2 , N 2 O and del 13 C. Griffith, D. W. T., Deutscher, N. M., Caldow, C. G. R., Kettlewell, G., Riggenbach, M., and Hammer, S.: A Fourier transform infrared trace gas analyser for atmospheric applications, Atmos. Meas. Tech., 5, 2481- 2498, 10.5194/amtd-5-3717-2012, 2012. Figure 13. Spectronus plumbing diagram. ecotech.com | 11
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