• Font Size
  • Normal
  • Large

CHAPTER 2FLOW METER TYPES & PRINCIPLES
PRESSURE DIAPHRAGM FLOW METER

PRINCIPLES

This is classified as a differential pressure flow meter. Differential pressure flow meters currently have the top market share for flow meter production volume. Using Bernoulli's principle, an orifice plate is installed into the path of flowing fluid, deliberately causing pressure loss. The pressure differential before and after the orifice plate is measured. The relationship between the pressure loss generated by the orifice plate , the flow velocity, and the flow rate are as follows:

Small flow ⇒ small flow velocity ⇒ The pressure loss created by the orifice plate is small
Large flow ⇒ large flow velocity ⇒ The pressure loss created by the orifice plate is large

The difference in pressure between upstream and downstream is detected using a pressure diaphragm.

PRESSURE DIAPHRAGM FLOW METER

PRESSURE DIAPHRAGM FLOW METER

FEATURES OF A DIAPHRAGM FLOW METER

PROS ・Able to detect gases, liquids, and vapors
・Generally low priced
・No moving parts.
CONS ・Because there is an orifice plate, great pressure loss occurs
・Not suited for fluids that include solids (clogging occurs)
・Because it is sensitive to turbulent flow, a long section of straight pipe is required

Back to INDEX

Back to page top

To solve the problem related to the Flow Sensor!