[net.general] hardware protection devices

havens (10/19/82)

We have had the unfortunate experience of the airconditioning for
our machine room fail causing the VAX to crash. Fortunately,
someone discovered the problem before anything melted.

We would appreciate recommendations about hardware to detect
emergency conditions, bring down the system, and turn off the power
to the hardware.
In particular:
 1) Who makes such devices?
 2) What do they cost?
 3) What environmental parameters do they sense?
 4) How do they interface to the software and the hardware?
Thanks for your help....