AVR-Chat

OWEN-A wrote:
> Thank you for the reply Kat,
> yes your suggestion would work well for a while but any dc component can
> cause electrolysis and plating which is also accelerated by the heat of the
> coolant and can eat away the electrode or the tank near the electrode fairly
> quickly, the probe is usually fed with a pulse usually around 4khz through a
> resistor capacitor network to remove any dc component.
> The LM1830 chip also detects the resistance of the probe and turns on an
> open collector transistor when the resistance increases above a preset level
> (coolant loss).
> I will try an avr looks like a bit of experimenting may be necessary for
> reliability.
>  
> Thanking you.
> Owen.  

Have a look:

http://www.coolon.com.au/download/DS_CL4L.pdf