Thanks guys for the interesting thoughts. All 6 of the PA's are solid state. They are the Quintron / Glenayre 90 watters.
At 12:46 PM 7/23/2007, you wrote: > > > If the blower is used to cool a tube pa the thermostat detection > > hardware is probably way to slow. > >I was assuming a SS PA, but maybe that was a mis-assumption. > > > Many vane indicators are of the long arm micro switch type. Easy > > enough to make your own but you can probably find them through > > companies like McMaster, C&H Sales Company, Grainger (all in > > Southern California) and many Heating & Air Conditioning Supply > > Stores. > >I hate vane switches, having seen way too many failures over the years. >Vanes breaking off, microswitches getting stuck due to all of the gunk that >accumulates, etc. Good transmitters use differential pressure sensors to >measure the difference between the two halves of the tube compartment. Too >much differential and you've got a blockage in the tube fins or socket. Not >enough differential and either the blower isn't running, the intake filter >is clogged, or the chimney is blocked. I always monitor stack temperature >too as a backup. > >For a SS PA, I still think a thermostat is the most reliable. > >I had a 5kW watt FM transmitter that somebody bypassed the air interlocks >on. The squirrel cage blower lost a blade and jammed up. Looked like a >miniature version of Cheryobyl in there after all was said and done...and >off to the scrap yard it went (it was 30 years old and due for retirement >anyway). > > --- Jeff > > > > > > > > >Yahoo! Groups Links > > > > > >-- >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: >7/22/2007 7:02 PM
