SIMRAD GD10P - IR GAS DETECTOR - ICEWeb

215. TECHNICAL DESCRIPTION5.1 IntroductionThe GD10P Gas Detector from Simrad Optronics is a point detector foruse in hazardous areas. A high-stability, solid-state infrared radiationsource combined with the latest developments in optical and electronicdesign have led to the realisation of a compact, accurate and costeffectiveinstrument able to monitor explosion dangers in real-worldenvironments.5.2 The GD10P conceptThe concept is based on measurement of infrared radiation passingthrough a volume of gas. The GD10P employs a dual beam, dualwavelength measuring principle with separate optical detectors formaximum stability and reliability.Since different types of gas have unique absorption spectra, they caneasily be identified by proper selection of an infrared wavelength atwhich absorption is measured. Radiation at another wavelengthmeasures the overall transmission through the optical system and theair volume. By comparing the transmission at the two wavelengths, thegas concentration in the air is determined. Having chosen awavelength which is characteristic of one type of gas, other types ofgas will not cause false alarms.Using a solid-state IR source instead of a lamp ensures high reliabilityand long-term stability with no regular maintenance or calibrationrequired during equipment lifetime.Figure 5.1Transmittance as a function of wavelength