I had this problem in the Almaden Country School 8th grade classroom.  The
stand-alone classroom building was built over a 4-ft high crawl space with
16 ft. spans between piers.  Talk about a trampoline...

Our solution was to enter the crawl space and place the sensor on concrete
blocks directly on the dirt floor.  There was no room to pour concrete for
footings, but this worked fine for two years.  We put the amp down there
too, but only do this if it is a 12-v power supply.

Is there any space below your floor to hold the sensor, with some access?
We had to disassemble the sensor to get it through the cut-out in the floor
of the closet which provided the only access to the crawl space.

If not, can you pour a slab outdoors and protect the area with an
enclosure?  Or maybe this is the opportunity to build a place for those
lawn tools...

Regards,
Ted Blank



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