Volucalc™ Hybrid VS is a variable and constant speed pump flowmeter. For variable speed pumps, it uses the pump curves flow/head/RPM of 1 to 4 pumps, the level and pressure signal and generates a flow proportionnal 4-20mA output. It uses the most advanced patented volumetric flow algorithm for constant speed pumps. Data is downloaded to a USB key or MaidMaps. No software required to produce reports. MaidMaps can activate a remote relay and display readings.