# Detecting Ammonia

cstoos
What is a cost efficient, yet accurate way to detect ammonia in a gaseous mixture?

espen180
Ammonia fumes react with HCl fumes and make a white smoke of ammonium chloride. Accuracy depends of the mixture, I guess.

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cstoos
Those Draeger tubes look like a viable solution, though it is a bit pricey for home use. The pump looks to be $600 for the cheapest version then$70 per test for the tubes.

The reason I am asking is I am wondering, with the application of selective catalysts to vehicles throughout Europe and the US, if there is a cheap way for the home mechanic to determine the efficiency of the urea injectors. \$650 for a troubleshooting tool is too much for that purpose.