Model SA-5100L-CH4

High Sensitivity Methane Detection
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Safeguard Analytics manufactures high quality gas detection sensors, safety control systems and gas process analyzers. Our team of scientists, engineers and marketing professionals have years of experience in the global gas detection market creating innovative and distinctive products. We design our products by keeping them simple and intuitive. We deliver safe and reliable solutions for virtually any commercial or industrial gas sensing application.


Safeguard Analytics Model IR-5100L-CH4 is an infrared based gas sensor designed to continuously detect and monitor combustible hydrocarbon gas in ambient air. Hydrocarbon gases are detected and measured using the non-dispersive infrared radiation absorbance technique as a source signal.

Model IR-5100L-CH4 infrared gas detection sensors consist of a light source and a dual channel pyro-electric detector mounted in a common optical chamber with an external retroflector to provide an open gas sensing chamber. Each dual channel detector is fitted with two optical filters. One channel functions as a reference detector and is fitted with a filter where there are no particular gas absorbance lines. The other channel functions as an active detector and is fitted with a filter that lets through IR light in the wavelength of the target gases – hydrocarbons typically absorb in the 3.25-3.4 micron region. As gas enters the optical chamber less of the source radiation reaches the active detector while the reference detector is unchanged. This differential in light reaching the pyro-electric detectors is the measurement signal.

Unless otherwise specified at time or order each IR-5100L-CH4 is calibrated with methane at the factory and requires no routine field calibration. Annual maintenance should include a visual inspection, a gas sample bump test and cleaning of the sapphire window. User interface is via a magnetic wand and the light bar status indicators.

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