In article ,
Christian McArdle wrote:

Indeed. Personally, I would also use hysteresis, rather than time
delay to avoid cycling.

And don't have independantly-adjustable Lower and Upper
trip points.... otherwise they can be crossed over, so
that the Upper is lower than the Lower.

Better to have (say) a Lower trip setting and a Window
size setting, plus a clamp so that Lower+Window does not
exceed 10V.

Note: The OP has a similar thread in sci.electronics.design.

--
Tony Williams.