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Article #163Re: Alarm for auto temp and press?
From: John Harvey
Date: Sat, 27 Jul 2002 03:41
Date: Sat, 27 Jul 2002 03:41
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2527 bytes
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. Try a Google search on switchgage. -- John H
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,763bf32a0633cc62 X-Google-Attributes: gid112d1e,public X-Google-Thread: 103407,763bf32a0633cc62 X-Google-Attributes: gid103407,public X-Google-Thread: 10d137,763bf32a0633cc62 X-Google-Attributes: gid10d137,public X-Google-Thread: 111d0a,763bf32a0633cc62 X-Google-Attributes: gid111d0a,public X-Google-Thread: 107cee,763bf32a0633cc62 X-Google-Attributes: gid107cee,public X-Google-ArrivalTime: 2002-07-26 20:41:17 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!news1.optus.net.au!optus!snewsf0.syd.ops.aspac.uu.net!intgwlon.nntp.telstra.net!news.telstra.net!newsfeeds.bigpond.com!not-for-mail From: John Harvey <no_one@home.au> Newsgroups: sci.electronics.basics,sci.electronics.design,sci.electronics.misc,alt.engineering.electrical,aus.electronics Subject: Re: Alarm for auto temp and press? Reply-To: johnharvey@bigpond.com Message-ID: <pq44kuoa602ltm81ujh262avl7l6og4phd@4ax.com> References: <0001HW.B9662A7A0081FD3711C75850@news.supernews.com> X-Newsreader: Forte Agent 1.91/32.564 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 24 Date: Sat, 27 Jul 2002 13:41:10 +1000 NNTP-Posting-Host: 144.135.49.44 X-Trace: newsfeeds.bigpond.com 1027740834 144.135.49.44 (Sat, 27 Jul 2002 13:33:54 EST) NNTP-Posting-Date: Sat, 27 Jul 2002 13:33:54 EST Organization: Telstra BigPond Internet Services (http://www.bigpond.com)