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GfG – The Worldwide Supplier Of Gas Detection Solutions


The RAM 4021 AutoCal® series is the unit of choice where specific and accurate measurement of carbon monoxide, oxygen or dew-point levels are required. Designed to meet OSHA requirements for monitoring of Grade D respirable air, this unit is equipped with a reliable electrochemical sensor that accurately indicates the level of carbon monoxide on an illuminated liquid crystal display. Adding versatility, this unit offers optional oxygen or dew point sensors for applications where detection or measurement is needed.



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Calibration and maintenance are simple with our innovative AutoCal® system. Additional features including alarm relay contacts, user adjustable alarm point, low flow alarm indicator and many more make this unit an intelligent choice. The RAM 4021 is available in four models, the 4021 (CO), 4021-1 (CO and O2), 4021-DPX (CO and dew point levels) and 4021-PR (CO and additional relay to signal power loss to monitor, complies with newest NFPA regulation). All models may be purchased with or without airline filter systems.

NFPA 1989 7.2 COMPRESSORS

7.2.1: OIL-LUBRICATED COMPRESSORS SHALL BE EQUIPPED WITH A TAMPERPROOF CARBON MONOXIDE (CO) MONITOR WITH AUDIBLE AND VISUAL ALARMS THAT SHALL SHUT DOWN THE COMPRESSOR WHEN THE CO LEVEL EXCEEDS 5.0 PPM AND SHALL HAVE A RESOLUTION OF AT LEAST 1 PPM.



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RAM 4021 CO Monitor

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GFG G460 Spec Sheet

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GFG G450 Spec Sheet


Please contact us for our full line of GfG Gas Detection products.

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