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Differential Pressure Instruments for Flow
Differential pressure instruments according to ISO 5167 are used in most industrial sectors. The available range of different throttling devices and materials allows measurement of many different fluids over a wide range of flow rates, temperatures and pressures. Due to their standardization, the expected measurement results are manufacturer independent. Design features, constraints and error limits of the various differential pressure flow elements are described in detail in the ISO 5167 standard. Listed below is a general description of the different elements that we offer.
Orifice plates with integral taps are manufactured from a single body and therefore are cost effective. The pressure tapping takes place at two points. The instruments are easy to install and offer good accuracy with reasonable inlet and outlet runs.
Annular chamber orifice plates consist of an orifice plate clamped between two annular chamber rings pressed together between standard pipe flanges. The pressure is measured upstream and downstream through the annular chambers. The accuracy is comparable to that of the standard orifice.
Meter Runs consist of the differential pressure element with inlet and outlet pipe sections. They are often used for small pipelines where pipe tolerances have a significant impact on the measurement accuracy. Typically, annular chamber orifice plate is used as the differential pressure element although other elements can be specified.
Paddle orifice plates for the installation between flanges or pipe taps consist of the orifice plate with a welded-on handle. The plates have no pressure taps and are therefore typically mounted between flanges containing ½” NPT pressure taps.