13 May
2013
13 May
'13
2:37 p.m.
On 05/13/2013 03:31 PM, Chuck Guzis wrote:
I wouldn't trust such an important job to anything BUT a mercury tilt switch.
In high school
science class the teacher brought out a jar full of it and
poured it out on the tabletop (it had an edge).
We got to play with it, tried picking it up with our fingers, etc.
No big deal.
Mercury tilt switches are some of the most reliable devices ever made. I have
a sump pump with one used as a level switch. No problems at all, even after
33 years of service. Do precision relays still have mercury-wetted
contacts? Or have the RoHS
goons eliminated those too?
Mercury-wetted relays are obscenely expensive, but they are still around.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA