I am trying to determine CO detector spacing for a large lab that has many gas turrets throughout the space. I can't find a manufacturer that has listed spacing for CO detectors. Has anyone else run into this issue before?
I also didn't find anything, this is my practice.
Carbon Monoxide is a gas that is lighter than air, so:
If placed on the wall:Mount detectors above and away from the door and window line. Avoid ventilation grids as well.Installation hight: minimum 7 ft from the floor and minimum 1 ft from the ceiling.
Mount as close as possible to the carbon monoxide emission source, and mount it also in zone of permanent residence of people.
Carbon monoxide sensors in rooms with a sloping roof (slants) should be placed on a higher wall room.
If placed on the ceiling:It should be separated by min. 1 ft from any wall or ceiling partition, e.g. a lighting installation.
In larger rooms, the horizontal arrangement of detectors is the same as the smoke detectors.
Do not mount the sensor directly above the source of heat, water or steam.
Would just note that CO is just barely lighter than air, which is likely why most early CO detectors were 110v outlet powered. For that reason a proper evaluation of the space may require someone with some knowledge about the potential causes, the air flow dynamics of the space and where to locate detection. I'd think the manufacturers installation directions maybe just a little too basic for installation in a large lab?
In spite of everything, however, carbon monoxide is lighter and tends to float with hot masses of air. It is additionally additive to oxygen. My guidelines are not so bad?
Tom, Your question is interesting. In industrial settings we typically locate CO sensors near potential sources of combustion such as vehicle maintenance areas, welding shops, and production areas where combustible materials are processed. In all of these areas ventilation is a mitigating factor and small quantities of CO never reach our alarm set points.
In a lab setting I would assume that a well designed ventilation system would be required and that being the case a significant CO release would travel with the systems airflow. Airflow is usually set up in zones, perhaps install your sensors to mirror the ventilation systems airflow design.
Also, in a lab setting would you not be using multi-gas sensors?
Steve and others, Thanks for the replies. Yes, depending on the use of the lab there may be multi gas sensors being used.
The reason for my question is for code compliance. We are now required to have CO detection in any building which has fossil fuel appliances. NFPA 720 states the detector should be "in the vicinity" of the appliance which in the appendix states is 10 feet. If I have a large lab with 40 or more Bunsen burners, do I need a detector within 10' of each burner to meet code? That could lead to a tremendous amount of detectors, which of course increases installation and maintenance costs.
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