In these applications, the choice of Water Rotameter mainly depends on the pressure drop across the flowmeter

　　Water Rotameters with the restricted flow will generally exhibit more pressure drop than flowmeters without flow restriction.

　　Many processes can only withstand a small pressure drop across the flowmeter. For example, many ventilation ducts only operate at a pressure of a few millimeters of the water column. In these applications, the choice of Water Rotameter mainly depends on the pressure drop across the flowmeter. Which of the following flowmeter technologies has the lowest gas service pressure drop?

　　A. Coriolis

　　B. Objective

　　C. Heat

　　D. Ultrasound

　　E. Eddy current shedding

　　comment

　　Water Rotameters that restrict flow will generally exhibit more pressure drops than flow meters that do not restrict flow. Both the target flowmeter and the vortex flowmeter contain flow restrictions, so answers B and E are incorrect.

　　Ultrasonic flow meters often have no restriction on the flow rate by Water Rotameter, so answer D is the candidate that exhibits the lowest pressure drop.

　　Small thermal flow meters may restrict flow, but larger thermal flow meters tend to have internal probes. The pressure drop across the probe is usually small, but it will be greater than an unlimited full-bore ultrasonic flowmeter.

　　Coriolis mass flowmeters can be designed with a straight tube type single tube, which is a full-hole flow meter and does not limit the flow rate. Using this analysis, it can be concluded that the Coriolis mass flowmeter also exhibits the lowest pressure drop. However, the installation of the Coriolis mass flowmeter should be considered as a whole. For accurate operation, Coriolis mass flow meters should not be operated at relatively low mass flow rates. Maintaining a sufficiently high mass flow usually requires increasing the gas velocity. This is usually achieved by reducing the size of the flowmeter (usually reducing the size of up to three pipes). Although the straight-tube single-tube flowmeter seems to have almost no pressure loss, the reduction of the pipeline will cause a significant pressure drop.

　　Therefore, unrestricted full-bore ultrasonic flowmeters generally exhibit the lowest pressure drop among the listed flowmeters.

　　Other complications

　　Full-bore thermal flow meters can show almost the same pressure drop as full-bore ultrasonic flow meters.

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