NO2 Sensor Placement in Fire House
NO2 Sensor Placement in Fire House
(OP)
Hi group,
Not exactly a thermo problem, but I haven't gotten any responses in the other forum I tried.
The situation is a fire truck with its engine running in its bay in the fire station. The client would like a sensor with alarming on high NO2 level (2 ppm) in case of exhaust leakage.
When the exhaust first comes out, it's hot and rises -- but NO2 is much heavier than air, so it falls when it cools.
Earliest warning would be a sensor up high, but what is the shape of the plume and how much does it diffuse? Could I even sense NO2 with a 0-10 ppm sensor?
A sensor down low by the floor, where a worker on a creeper may be exposed, would be later but perhaps more certain placement?
Oh, and sometimes they run the main building exhaust and leave the roll-up doors open instead of piping the exhaust outdoors...
Thoughts would be appreciated!
Not exactly a thermo problem, but I haven't gotten any responses in the other forum I tried.
The situation is a fire truck with its engine running in its bay in the fire station. The client would like a sensor with alarming on high NO2 level (2 ppm) in case of exhaust leakage.
When the exhaust first comes out, it's hot and rises -- but NO2 is much heavier than air, so it falls when it cools.
Earliest warning would be a sensor up high, but what is the shape of the plume and how much does it diffuse? Could I even sense NO2 with a 0-10 ppm sensor?
A sensor down low by the floor, where a worker on a creeper may be exposed, would be later but perhaps more certain placement?
Oh, and sometimes they run the main building exhaust and leave the roll-up doors open instead of piping the exhaust outdoors...
Thoughts would be appreciated!
Best to you,
Goober Dave
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RE: NO2 Sensor Placement in Fire House
The openness of the fire stations that I have seen (on open house days or school tours with my sons) lead me to think anywhere near the exhaust area of the truck would be good enough. The truck bays were large and open and would take a very extended amount of time to accumulate.
RE: NO2 Sensor Placement in Fire House
Best to you,
Goober Dave
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RE: NO2 Sensor Placement in Fire House
RE: NO2 Sensor Placement in Fire House
Client says NO2 reaches toxic level more quickly than CO in diesel engine exhaust. I'm not able to debate him with my level of combustion knowledge -- I just have to sense what the spec says. I'd like to side with you, CO mixes nicely in the air.
Best to you,
Goober Dave
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RE: NO2 Sensor Placement in Fire House
RE: NO2 Sensor Placement in Fire House
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC153132...
I looked up the costs, the no2 detect is way more expensive.
RE: NO2 Sensor Placement in Fire House
RE: NO2 Sensor Placement in Fire House
Best to you,
Goober Dave
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