Re: Alarm for auto temp and press?

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#164

From: Da Man
Date: Sat, 27 Jul 2002 06:18

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"John Harvey" <no_one@home.au> wrote in message
news:pq44kuoa602ltm81ujh262avl7l6og4phd@4ax.com...
> DaveC wrote:
>
> >Would like to have in my car a high coolant temperature alert and low oil
> >pressure alert combined and automated. Coolant monitor input should have
> >calibration ability for custom adjustment for each vehicle. Pressure can
be
> >simple zero volt input trigger (I think most oil pressure crises are the
> >result of loss of pressure, not simply the lowering of this). Output
could be
> >either an audible alert or relay contacts to break ignition supply (or
reduce
> >the supply voltage so as to get your attention) or sound an alarm.
> >
> >Does such a thing exist?
>
> Yep, called Murphy Gauges.  Not available as temp/ pressure combined
> AFAIK, but they're certainly available separately.
>
> They're gauges with adjustable switches which can be used to either
> switch an alarm or shut down the engine at predetermined settings.
> Commonly used on industrial engines, especially gen sets etc. which
> operate unattended.

Shutting down an automotive engine from a drop in oil pressure is very
dangerous. Say you were going around a corner and you were low on oil, the
oil pump sucks a glup of air, and you end up stuck in the middle of a huge
interesction with a dead engine.


>
> Try a Google search on switchgage.
>
> --
> John H

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From: "Da Man" <levy_jeff@hotmail.com>
Newsgroups: sci.electronics.basics,sci.electronics.design,sci.electronics.misc,alt.engineering.electrical,aus.electronics
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