On 15/07/10 10:00 PM, Steve B wrote:
wrote in message
...
In the summer I probably lose 150 gallons a day or so to evaporation with
the level falling about 1/4" per day. If it falls below the skimmer level
the pump will such air because the bottom drain is no longer functional.
The problem is when I go out of town for work or on vacation and no one
monitors the pool level.

Yesterday I replaced the manual fill valve with a 24VAC valve and hooked
it to my sprinkler controller so I can add water automatically, but there
is no feedback as to the water level. I'm trying different daily fill
times to find one that maintains the water level relatively constant, but
it's inexact and depends on the weather.

I want to construct some sort of level detector that will cut off the
automatic fill valve if the level gets too high, or I could disconnect the
timer and hook the level detector relay directly to the valve.

I was thinking of this:

"http://www.ingramproducts.com/Pumps_Level_Controls-24_VAC_Multi_function_Moisture_Sensing_Relay.html"

and this:

"http://www.ingramproducts.com/Pumps_Level_Controls-Custom_Sensor_Assemblies_for_Liquid_Level_Control_ 1.html"

In the winter and spring I often have the opposite problem, the pool
overflows from rain, and I'd like to also do something that opens the
pump's drain valve diverter and removes water until the level falls to the
proper level.

A friend of mine has a spendy one that's all plastic, and a real POS.

I saw those for sale, and I thought that it would not work well. the
worst thing would be if it failed in a way that the water ran continuously.