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No. 18
TDA-5B/5A Pulsing/Wet Aerosol Output
Problems with the aerosol output of the
thermal generators seem to occur frequently. Since DOP and
PAO are hydro-carbon products, carbon builds up in the heater
block.
To correct this problem, it is assumed that
the heater block and heaters are working properly. That is,
the unit is maintaining a 765 ±
15 º
F or 405 ±
10 º C
operating temperature, and there is no carbon build up restricting
the heater block nozzle. To check for nozzle restriction insert
a piece of wire (such as a paper clip) into the nozzle tip
while it is operating to remove any residue which may have
accumulated. Caution: The nozzle tip is very hot.
Use a pair of long nose pliers to hold the wire.
If the heater block and heaters are working
properly and the heater block nozzle is not restricted, the
problem should be with the setting of the internal regulator.
Either it is adjusted for too much flow or it has failed.
The problem may be solved by not having the metering
valve fully open (try 3/4). This will reduce the flow of liquid
to the block and minimize droplet formation at the nozzle
tip. These droplets are normally the cause of aerosol pulsation.
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