The S Variable Series are peristaltic pumps with practical functions such as backup pump capability, leak detection, and remote operation for industrial, water, wastewater, and commercial swimming pool applications. The pumps have 20:1 turndown and run at the speed set with the adjustable potentiometer when power is applied or the standby input is removed. The Series has LED pump status indicators and three output relays for indication from the pump to a separate device, like a process control device.