The Pitot Tube Flowsensor measures the flow in pipes and ducts according to the differential pressure working principle. It allows bidirectional flow with low pressure loss, low maintenance and installation cost and accurate long term reading.
The Pitot Tube Flow Sensor uses the differential pressure principle based on the basics of Bernoulli. A rectangular design of the sensor profile is divided diagonally into two symmetrically constructed chambers with sensing holes (dp-tappings). The chamber facing to the upstream generate a higher pressure (p+) and the chamber in the downstream a lower pressure (p-). Several dp-tappings along the ensor profile provide a steady averaging of the flow velocity. This facilitates exact metering even with irregular flow profiles. Each chamber is connected to the corresponding side of a differential pressure transmitter. The value of the differential pressure is the measure to determine the flow. With increasing flow the dp increases. A differential transmitter converts the dp into an electrical signal (i.e. 4-20mA) that is transmitted to the process control system.
Advantages
- Long-term accuracy
- Low installation costs
- Short up/down straight pipe run requirements
- Low permanent pressure loss
- Cost effective
- Low maintenance, bi-directional flow measurement
