🚀 go-pugleaf

In article <0001HW.B9662A7A0081FD3711C75850@news.supernews.com>, 
anon@example.net says...
>
>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? 
>
>Suggestions as to how to design this circuit? How simple could this circuit 
>be made?
>-- 
>Note that my return address is corrupted in an attempt to reduce spam. If 
you 
>choose to e-mail me, please correct my address as described below.


"Oil pressure crises" do in fact occur from operating at insufficient 
pressure. The only reason people think that all that matters is a drop to 
zero pressure, is that this is what happens when you run out of oil.

In fact, operating at too low a pressure (but still WELL above zero), such 
as what occurs with insufficiently viscous oil, or with a worn pump or 
bearings, will trash an engine over time. Warning when pressure hits zero is 
basically useless; your engine is already scrap.

Bob.