HEAD FLOW METERS - h1013v1

Instrumentation and Control Volume 1 of 2
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Flow Detectors HEAD FLOW METERS HEAD FLOW METERS Flow measurement is an important process measurement to be considered in operating a facility’s fluid systems. For efficient and economic operation of these fluid systems, flow measurement is necessary. EO 1.1 EXPLAIN the theory of operation of a basic head flow meter. EO 1.2 DESCRIBE the basic construction of the following types of head flow detectors: a. Orifice plates b. Venturi tube c. Dall flow tube d. Pitot tube Head flow meters operate on the principle of placing a restriction in the line to cause a differential pressure head. The differential pressure, which is caused by the head, is measured and converted to a flow measurement. Industrial applications of head flow meters incorporate a pneumatic or electrical transmitting system for remote readout of flow rate. Generally, the indicating instrument extracts the square root of the differential pressure and displays the flow rate on a linear indicator. There are two elements in Figure 1 Head Flow Meter a head flow meter; the primary element is the restriction in the line, and the secondary element is the differential pressure measuring device. Figure 1 shows the basic operating characteristics of a head flow meter. Rev. 0 Page 1 IC-04

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