November 1, 2021
After reviewing recent updates to regulatory authorities' recommendations on low alarm activation for CO2 %vol sensors, we have adjusted our suggested (and factory default) alarm setpoints as follows:
NEW ALARM SETPOINTS
OLD ALARM SETPOINTS
LOW ALARM = 0.5% vol (5,000 ppm)
MID ALARM = 1.5% vol (15,000 ppm)
HIGH ALARM = 3.0% vol (30,000 ppm)
NIOSH REL: TWA 5,000 ppm / STEL 30,000 ppm
OSHA PEL: TWA 5,000 ppm
IDLH = 40,000 ppm
National Board Inspection Code (NBIC) Part 1 Supplement 3
National Fire Protection Association (NFPA) 55
International Fire Code (IFC) Sections 5307.5,1 and 5307.5,2
Compressed Gas Association (CGA) (Note: the CGA is not a regulatory body)
If your application requires specific alarm relay setpoints, values are easily changed in the field or can be specified at time of order.
NOTE: These alarm setpoints are for applications where CO2 is used or produced by means other than breathing, such as wineries/breweries, greenhouses, CO2 storage rooms, chiller/mechanical rooms for CO2 refrigerant leak detection. Indoor air quality applications commonly use CO2 ppm sensors and specify different guidelines.