Re: Water sensor - dynamic thermal resistance sensor

Hello Jim,

Couldn't you simply measure output pressure?

Yes, but pressure sensing is more expensive than current sensing. Plus it needs to be plumbed in and the tap-off tube to the sensor gets clogged and it stops sensing (happened in our pump house).

Around here we periodically drain our swimming pools (to get rid of
mineral concentration due to evaporation).  A submersible pump is
used, which turns off automatically when the pool is empty.  Wonder
what they use?

Probably just the usual float switch.

Draining a pool? Now I know why we are always short of water in the west. Out here nobody would dare to do that since the water bill would be excruciating. We keep the chems balanced despite evaporation. My test kit measures seven parameters and at least once a year we carry a sample to the store where they do more tests, to see what needs to be balanced out. Since our last pool guy just disappeared I began doing it myself and for some reason now the pool store never finds an imbalance. No more scaling of the walls either.

Regards, Joerg

http://www.analogconsultants.com
.