Flame goes out after a minute of use
When we are running the machine, the flame goes out randomly (usually less than 2 minutes). We are using air and acetylene only. The flame looks fine and all the interlocks are good even after the flame goes out. The flame can be restarted immedietly but is more likely to go out sooner. When the machine is cold we get about 6 minutes out of it, before the flame shuts off. After restarting, the flame only lasts a minute or so. We tried increasing the Acetylene content a little and saw no change. We do work in an area which does have dust in the air and typically high humidity.
This is pretty obvious to me that it is temperature related. Either your cooling water is non-existent or not sufficient or the temperature sensor is too low or defective.
PE AA/ICP/ICPMS Tech
Is your burner chamber draining properly? If the chamber starts to get full the flame would go out quickly and it would occur faster on subsequent attempts as there's still fluid in the burner chamber from the first one. You may need to clean the burner chamber out by taking the end cap off and cleaning it with a laboratory detergent solution and soft bristled brush if particulates have accumulated inside.
There is no cooling system for most flame AAs.