Thanks Mark.
I'll see if I can find the publication you mention.
Regarding the generator I wouldn't even know what to search for. The one on the sensor does not really specify much detail. Surely today one should be able to find a more compact and solid unit to put in it's place. I assume Epic Tech. no longer exist in it's 1986 form?
Edit:
Maybe one could ask Daniel S. Snyder, the inventor.
http://www.google.com/patents/US4510484