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I want to install a visible (light ) alarm for our gray water tank. There is a 110 power source at the tank site for the lift pump. The light would be on the 4 x 4 post which has the 110 outlet. Does your SP-04000 High Water alarm have a float switch? If not what kind of a switch do I need to install this alarm?
you can use a mercury float by sje rombus https://www.wholesalesepticsupply.com/collections/sje-rhombus-float-switch/products/sje-rhombus-p-n-1017956-aerobic-septic-alarm-float-switch?variant=4540099012 to accomplish this
Does it use a normally open or closed float switch
You can use either a normaly open float switch or normally closed since they both have to close contact to work. The only diffrence is they close contact in a different position. So you can use either float switch if you want.