Ambient air location guide

[jamesbanda]

Dear sirs,

Can anyone recommend an API or other standard which covers best pratice for selecting ambient air detector locations eg for flammable or toxic gas.

For our project we will valide what we have use on previous designs but i would like to check if any usefull international standards exsit or good gudielines which could follow for selection number ,location etc.

We plan to get a group of operational experts in and select these but a some guidance notes would help ensure consistancy acccorss procses areas.\

 

[dcasto]

its like sitting at a camp fire, smoke follows beauty. Just as soon as you pick prevailing wind, it doesn't prevail.

You need to cover prevailing wind, then spread out few in the other directions, taking into accout buildings and places where there are ignition sources or high probability of people occupation.

 

[JimCasey]

Bear in mind what vapors you are needing to detect.

Heavier-than-air vapors such as gasoline will pretty much flow like water. Mount detectors in sumps or low on the wall. Bear in mind that if the detector gets flooded the little platinum bead will be instantly and permanently destroyed. Most suppliers offer splash protectors, but common sense helps when locating dectors.

If you are sniffing for hydrogen or methane, you put the detectors in the eaves of buildings, where leaked gases will rise and collect.

Most places have prevailing winds from the west, so concentrate your detectors toward the east side.