Home made engine cooling alarm

[ebbtide11]

Can anyone help - a couple of years ago there was an article in Practical Boat Owner from a reader showing how to make up a cooling pump failure alarm for a boat engine - I followed the recipe at a cost of around £20 for parts and it's been very sucessful.

A friend is looking for a copy of the article to do the same DIY project - can anyone help with a copy of the circuit diagram and the parts specifications?

The parts consist of a magnetic flow switch, high decibel buzzer, LED, a resistor, and watertight junction box.

 

[DevonMark]

The article was in June 2006 and it seems it is just about the only issue I don't have from the last 4 yeas or so. You can get a copy by searching http://marinedirectory.ybw.com/reprints/results1.jsp?tem=pbo or maybe somebody else can help?

 

[srp]

I have a copy of the original circuit I think, which I can email you if you pm me. I have also made an improved circuit, which uses the same flow switch, which is on the Corribee web site technical pages - here

 

[catalac08]

a simple digital fridge alarm/temperature gauge will work fine with the sensor glued to the engine head with a dab of epoxy - can set the alarm level degrees f or c and alarm buzzer pretty loud
a cheap solution but works for me

 

[srp]

While I'm not dismissing your use of a temperature alarm, it doesn't actually do the same thing as the flow switch circuit. A flow switch is more likely to help in protecting the impeller in the case of a blocked inlet. Mine worked in anger for the first time this week (because someone forgot to turn the seacock on /forums/images/graemlins/blush.gif) - it would have taken a while for a temperature alarm to activate, as it was the first time the engine had been started that day, and was therefore stone cold.

 

[lw395]

Having just returned from the pub, it occurs to me that many electric showers have flow switches in them, to turn on the heating current.
cpc and others sell spares.
Other than that, a thermal switch sensing the exhaust temp, would get hot long before the engine overheated?
I rely on just getting alarmed when no water comes out the back, and knowing the change in exhaust note from experience!
Cheers,

 

[glsg91]

[ QUOTE ]
I have a copy of the original circuit I think, which I can email you if you pm me. I have also made an improved circuit, which uses the same flow switch, which is on the Corribee web site technical pages - here

[/ QUOTE ]

Site or url is not working

 

[Skyva_2]

works for me

http://www.corribee.org/inboard13.html