Re: Central Vac overload

[jamesgangnc <jamesgangnc@xxxxxxxxx>]

On Apr 1, 7:59=A0am, "B Fuhrmann" <b-fuhrmann-
use...@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> >> Here's a unit that will open up whenever
> >> there is a vacuum pressure increase.
> >>http://www.thinkvacuums.com/beam/valve.html
> >> I'm sure others have similar products.
> > Art, that's perhaps the best solution I've ever gotten to a question I'=
ve
> > posted
> > on the net. =A0$10!!!!!! =A0That's just what the doctor ordered. =A0Tha=
nks very
> > much!
>
> If you want an alarm (other than that the vacuum tool is not picking up a=
s
> much as usual) you could add an air flow sensor in the line to the safety
> valve. =A0If there is flow, the alarm is triggered.

I like the cuirrent sensing solution tied to a triac to turn the thing
off when it clogs.  That way you know right away and you don't waste
you time vacuuming an area with the system clogged.  Sometimes when
you vacuum a relatively clean area with a beater head you do not
easily notice that the suction has stopped.  The circuit would be
fairly straighforward and could probably be done with an opamp, an
optoisolator and a 20amp triac.  An alarm would have to be pretty loud
to be heard over the beater anywhere in the house.