At present, in the industrial production process, most of the flow measurement of water, steam, and gas use standard orifice flowmeters. The advantages are accurate and hard to wear, but the pressure loss is large, resulting in energy waste. The elbow flowmeter not only has the advantages of orifice flowmeters, but also does not have additional pressure loss. It is a typical energy-saving differential pressure flow measurement system.

First, structure and composition

The elbow flowmeter sensor is a 90° standard elbow with a certain ratio of bends and diameters. It does not have any insert parts inside. A pressure tap is made on the inside and outside of the elbow sensor at 45° and is passed through the pressure tube. The differential pressure value sensed by the elbow sensor when the fluid passes through is routed to the differential pressure transmitter for flow measurement.

The elbow flow meter consists of three parts: elbow sensor, differential pressure transmitter and flow totalizer or DCS system.

Second, the measurement principle

The elbow flowmeter sensor uses a fluid's inertial principle to measure flow. When the fluid passes through the elbow, the fluid is forced into a similar circular motion within the elbow due to the fluid being constrained by the elbow. According to the fluid forced swirling theory, the following rules for the fluid to follow the circular motion are similar to the circular motion of the solid in the space state.

The fluid in the elbow flowmeter bends to produce a centrifugal force in a circular motion. The effect of centrifugal force causes the fluid to produce a pressure difference between the inside and the outside of the elbow. The pressure difference is related to the density and the average flow rate of the fluid. By measuring the differential pressure value with a differential pressure transmitter, the average flow velocity of the fluid can be calculated and the flow rate of the fluid can be determined.

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