MAP sensor calibration

[adh at an.bradford.ma.us]

	From: Donald Whisnant <dewhisna at ix.netcom.com>
	
	>From: masmith <masmith089 at qnet.com>
[]
	>any dense liquid could be used instead - the relevant factor of conversion
	>is density relative
	>to water. - the tubes will have to be longer....
	>for example
	>motor oil - thick syrup - (anybody else got any ideas?)
	>even if you have to build something 10 feet high with a step ladder, its
	>still safer than slow poisoning.
	>(alternatively - build it DOWN into a swimming pool for example.
	>you might find it hard to buy a quart of mercury without half a dozen EPA
	>forms, at least in the US anyway..
[]
						    But as you say, it is still safer
	and easier to use an Hg substitute and make a scale conversion.  .... Try
	checking with Dwyer Instruments to see what substitute they recommend, I'm
	sure they know of one, or probably even sell one as well... .. Perhaps a
	glycerin compound?

replacing the mercury is definitely a Good Thing [tm].  when i was a
chem student, i had a professor that sprinkled sulfur powder on a
fluorescent light that broke on the floor, because of the health
hazard the tiny amount of mercury presented [sulfur easily reacts with
mercury, and the resultant compound is a solid].

but so far all the alternatives suggested have confused density with
viscosity.  mercury is extremely dense - in the ballpark with lead -
and has a -low- viscosity, whereas the substitutes mentioned are all
close to water in density.

off the top of my head, all the fluids i can think of are also close
in density to water...	:^<
_______________________________________________________________________________
Andrew Hay
	    LIFE, n: A phenomenon that resists the second law of thermodynamics
adh at an.bradford.ma.us						---Schroedinger