vederstein
Must do dumb things....
- Joined
- Feb 26, 2011
- Messages
- 917
- Reaction score
- 744
I have a problem.
I'm trying to add an automatic boiler feed to my monotube boiler. Due to the small size, options like floats are not really feasible.
I've seen people use a spark plug such that when the (non-pure) water reaches the plug, the water bridges the plug's gap and closes the circuit.
I started with this design and it didn't work. Thinking that the spark plug's electrode had a high impedance, I created my own out of brass.
Still no luck.
After some investigation I have the following data:
When the circuit is open, my resistance is off scale (no suprise).
When the plug is immersed in water, my resistance is about 100 kohm.
So, my (tap) water is too pure?!?!?
Does anyone know what circuitry I'd need to take this reduced signal back to run a relay where I could run the boiler feed valve?
Thanks,
...Ved.
I'm trying to add an automatic boiler feed to my monotube boiler. Due to the small size, options like floats are not really feasible.
I've seen people use a spark plug such that when the (non-pure) water reaches the plug, the water bridges the plug's gap and closes the circuit.
I started with this design and it didn't work. Thinking that the spark plug's electrode had a high impedance, I created my own out of brass.
Still no luck.
After some investigation I have the following data:
When the circuit is open, my resistance is off scale (no suprise).
When the plug is immersed in water, my resistance is about 100 kohm.
So, my (tap) water is too pure?!?!?
Does anyone know what circuitry I'd need to take this reduced signal back to run a relay where I could run the boiler feed valve?
Thanks,
...Ved.
