Vacuum cleaner blocked pipe and/or robbag full sensor

Some domestic vacuum cleaners on the market use a simple spring loaded mechanical gadget to indicate the blocked pipe and/or full bag. I do beleive
some slightly more expensive or new generation vacuum cleaners use some sort of elecronic sensor for this.
Do you know any sensor to detect blocked vacuum pipe and/or full dust bag in a vacuum cleaners? (Part number, specs, suppliers etc?)
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"Mark Holvek" <mh> wrote in message

The simple trick I can think of is to monitor motor speed which will increase when there is a blockage. Hall effect sensors come and an AVR Atiny microcontroller come to mind.
TC
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Use the simple spring loaded mechanical gadget. This is a vacuum indicator. When the hose gets plugged, vacuum within the hose increases because there is less of a hole to suck atmosphere in to. Put a sensor of some sort on this indicator. maybe a simple microswitch, magnetic switch.
Mark Holvek wrote: ;Some domestic vacuum cleaners on the market use a simple spring loaded
;mechanical gadget to indicate the blocked pipe and/or full bag
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On 15 Oct 2005 14:04:28 -0700, snipped-for-privacy@gmail.com wrote:

Perhaps they use a crude differential pressure gauge?
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"Mark Holvek" <mh> wrote in message

beleive
sort
in
There could be nothing simpler than a manometer!
r

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On Thu, 20 Oct 2005 11:12:59 +1300, "Roger Dewhurst"

Thats the word i was looking for. Often found in HVAC filters.
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Sounds like the name of one of those strength testers at carnivals/whatever .. Man-O-Meter!

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