low coolant alarm

Simple electronic timer.

Not being electronically or solder minded I went straight out and bought one of Andy Capy's Lolarm II Units for Ted..

Clear instructions, simple to install, it works.

Result.

Recommended.

Here is another novel circuit which I have designed for a Low Coolant Warning.
I have modified this circuit due to a prob;em with PIV of the LED. Needs looking in to. Meanwhile this circuit will work with 1 LED as warning.
The built in time delay is 15 secs which I have found to illiminate any false alarms.
The total cost to build is under a tenner and is fun as a hobby.
LED ref is WL84F
All components available from Maplin.

Good stuff Ian!

When my wife's brother in law came to visit us he fell in love too . So when he got home promptly bought one also.

Is he a member here yet?

http://www.falstad.com/circuit/#%24+1+6.0E-4+10.20027730826997+50+5.0+43%0Aa+224+240+352+240+0+10.0+2.0+1000000.0%0Aw+224+224+192+224+0%0Aw+224+256+128+256+0%0Ar+192+224+192+32+0+10000.0%0Ar+192+224+192+432+0+10000.0%0Ar+128+256+128+32+0+220000.0%0Ar+128+256+128+320+0+1000.0%0Ac+128+320+128+432+0+1.0E-4+11.999990875019353%0Aw+128+256+48+256+0%0Aw+128+432+48+432+0%0As+48+320+48+432+0+1+false%0Aw+352+240+416+240+0%0Aw+128+32+192+32+0%0Aw+128+432+192+432+0%0Aw+192+32+416+32+0%0Aw+416+32+544+32+0%0Aw+192+432+544+432+0%0AR+544+32+608+32+0+0+40.0+12.0+0.0+0.0+0.5%0AR+544+432+608+432+0+0+40.0+0.0+0.0+0.0+0.5%0Aw+48+256+48+320+0%0Ar+544+432+544+240+0+330.0%0A162+416+240+544+240+1+2.1024259+1.0+0.0+0.0%0A

Here is a simulation of the circuit.
The float switch is on the left hand side.
To change state click on it.
Closed means the level is low and the LED illuminates
Have a play.