EXAMPLE CIRCUIT DIAGRAMS FOR ELP (See also EL-22)
ELP-1 one pump control or dry running prevention. ELP-2 high level alarm and dry running prevention or emptying pump controlling. ELP-3 controlling two pumps. Starts at different levels, mutual stop. Also high level alarm. ELP-4 controlling tree pumps. Starts 
at different levels, mutual stop. Also high level alarm.