Re: Strain gauge

["Robert Green" <ROBERT_GREEN1963@xxxxxxxxx>]

Thanks for the information about the sensors.  I'll look into it.

--
Bobby G.


"Robert L Bass" <sales@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:l6c9v1pgf138726jtfrpivhse6e8qtkbdc@xxxxxxxxxx
> > Has anyone here ever mounted strain gauges on
> > basement jacking posts to measure the load changes
> > of the floor supported by the posts?
>
> I imagine someone has though I haven't.  Coincidentally, there
> are strain sensors that measure floor joist flexing to detect
> burglars.  A company called Sure Action makes them.  They call
> the products "Pulsors".  They give off a tiny electrical current
> when the joist flexes due to an intruder's weight above.
>
> You could measure the current and build a simple circuit to
> detect occupancy  but it only responds to flexing -- not a static
> load -- so it still doesn't solve the perennial problem of room
> occupancy for HA.  :(
>
> I've used these sensors on my own jobs a few times.  When
> properly installed they work well.  Poorly installed they won't
> detect anything smaller than Mama Kass.
>
> The company also makes processors to trip an alarm or HA system
> sensing zone when it detects movement above.  The main benefits
> of these things are they're completely undetectable from the
> protected area and they are immune to most of the things that
> cause false alarms with motion or glass break detectors.  The
> disadvantage is they require more effort to install than the lick
> 'n'stick wireless motion detectors that have become standard fare
> in the alarm industry.
>
> If you want to experiment with one of these sensors let me know.
> Although I don't currently list them online, I carry Sure
> Action's other lines and can provide these as well.
>
> --
>
> Regards,
> Robert L Bass
>
> Bass Burglar Alarms
> The Online DIY Store
> http://www.BassBurglarAlarms.com
>
> --
>
> Never underestimate the power of very stupid people in large
> groups.
>