GAS FILTER CORRELATION
STABLE , ULTRA-ACCURATE PHOTOMETRIC GAS ANALYSIS
Gas Filter Correlation ( Gfx ) sensing is an enhanced version of the photometric analysis used in our Infrared technologies . It performs effectively where extremely accurate , low-level measurements are needed , or where background gases may interfere with the measurement .
Gases have the ability to absorb unique light wavelengths – Gfx sensing uses that property to detect the concentration of a selected gas in a mixture .
Two gas-filled cuvettes are mounted on a rotating disk , each passing through a beam of light alternately . One cuvette ( the measure cuvette ) is typically filled with nitrogen while the other cuvette ( the reference cuvette ) is filled with a sample of the gas to be measured . Light is passed through the gas to be measured : the difference in absorbance is measured and provides a direct output of the gas concentration .
Offering real-time measurement response , Gfx measurements are unaffected by background gases , and the technique is virtually immune to obscuration of the optics . This prevents sensor drift , greatly reducing calibration frequency .
THE Gfx TRANSDUCER
P80