The orifice plate flow meter is installed in the water circuit of the trainer. The flow rate measurement is based on the differential pressure method.
The orifice plate narrows the cross-section in the tube. The constriction of the cross-section causes an increase in velocity which results in a measurable differential pressure. A transducer based on variable capacitance (diaphragm method) is used to measure the differential pressure. It is indicated on a display. Taking the orifice geometry into account, the flow rate can be calculated from the decrease in pressure using Bernoullis principle and the Continuity law.
Learning Objectives / Experiments
Familiarisation with the operating principle
Continuity law and Bernoulli's principle
Transducer with capacitive sensing element
Flow rate measurement
Plotting a pressure loss curve
Comparison with other flow meters
Specification
Orifice Plate Flow Meter with electronic differential pressure transducer for flow rate measurement as accessory for flow meter trainer
Operation based on the differential pressure method
Display indicating differential pressure
Connections to facilitate pressure loss measurement with flow meter trainer
Connections to supply auxiliary power via flow meter trainer