The measuring nozzle is installed in the water circuit of the HM 500 trainer. The flow rate measurement is based on the differential pressure method.
The measuring nozzle narrows the cross-section in the tube. The constriction of the cross-section causes an increase in velocity which results in a measurable decrease in pressure. Taking the nozzle geometry into account, the flow rate can be calculated from the decrease in pressure using Bernoulli’s principle and the Continuity law.
The necessary connections are provided to measure and display the associated pressure loss with the HM 500. The transparent front makes the measuring nozzle visible, thus aiding understanding of the operating principle.