Anyone have any thoughts or suggestions on the best way to monitor typical building water booster pumps that are low cost and easily integrated in to the plc/control box? I see lots of high end, expensive sensors used on very expensive pumps in manufacturing process but for my purpose ie. domestic booster pumps for water supply to a building, the cost of these sensors would be more than the price to replace the pump. In the past I see where simple aquastats have been place near the pump to detect a rise in heat to signal shut down. What are some cheap reliable pump monitor sensors currently being used for these purposes?