Flow DetectorsHEAD FLOW METERSSummaryHead flow meters operate on the principle of placing a restriction in the line to cause a pressuredrop. The differential pressure which is caused by the head is measured and converted to a flowmeasurement. The basic construction of various types of head flow detectors is summarizedbelow.Head Flow Meter Construction SummaryOrifice platesFlat plates 1/16 to 1/4 in. thickMounted between a pair of flangesInstalled in a straight run of smooth pipe to avoid disturbance of flow patternsdue to fittings and valvesVenturi tubeConverging conical inlet, a cylindrical throat, and a diverging recovery coneNo projections into the fluid, no sharp corners, and no sudden changes in contourDall flow tubeConsists of a short, straight inlet section followed by an abrupt decrease in theinside diameter of the tubeInlet shoulder followed by the converging inlet cone and a diverging exit coneTwo cones separated by a slot or gap between the two conesPitot tubeConsists of a tube with an opening at the endSmall hole in the end positioned so that it faces the flowing fluidRev. 0 Page 7 IC-04
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