Gas detectors designed to help comply with ASHRAE 15 and 34, EN 378, and CSA B52 are to protect someone from entering a mechanical room with refrigerant concentrations that could be harmful to their health. These protection levels are outlined in the safety standards to be about 1000ppm, 8-hour TWA depending on the type of refrigerant being used in the equipment. The alarm setpoints, location, and a number of detection points outlined in the safety standards are typically insufficient for finding the more common, smaller leaks that add up to large annual refrigerant emissions, decreased efficiency, and overall safety.
Small Leaks Moderate Leaks High Level
Leak Probability Very Likely Less Likely Extremely Unlikely
Safety Gas Detector 100 ppm MDL Detector WILL NOT DETECT MAY NOT DETECT WILL DETECT TO MEET SAFETY STANDARDS
Ultra-Sensitive Sampling System 1 ppm MDL Detector WILL DETECT WILL DETECT WILL DETECT

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