I've read some threads discussing the time and temps that OA vaporizes. I have the 12volt version so I Contacted Heilyser Technology. They said it is easy to overheat the OA with the propane torch version but impossible to overheat the 12volt system. He said the 12 volt system doesn't heat up fast enough to overheat the OA before it is vaporized while passing thru the correct temp range so there is no need to worry about the unit getting too hot during the process. He said the simplest thing to do is watch the unit and time it to see how long it takes to empty the tray and duplicating the time when you've got it in the hive. He also gave me the standard warnings, use a long wire, pay attention to wind direction, DO NOT BREATH this stuff...

Thought I'd pass this along for intrested parties.
Robbin