Turbine meters have found widespread use for accurate liquid and gas measurement applications. The unit consists of a multiple-bladed rotor mounted with a pipe, perpendicular to the liquid flow. The rotor spins as the liquid passes through the blades. The rotational speed is a direct function of flow rate. Electrical pulses can be counted and totalized.
- Highly accurate and repeatible
- Eexcellent long-term reliability Installation flexibility
- Economic and cost-effective solution for applications requiring high accuracy
- Only one moving part reduces maintenance cost
- A wide selection of materials A wide selection of output options
- There is many different manufacturing design of turbine flow meters, but in general they are all based on the same simple principle:
- If a fluid moves through a pipe and acts on the vanes of a turbine, the turbine will start to spin and rotate. The rate of spin is measured to calculate the flow.
Electromagnetic Flow meter
Ultrasonic Flow Meter
Ultrasonic flowmeters can be divided into Doppler meters and time-of-travel (or transit) meters.
Doppler meters measure the frequency shifts caused by liquid flow. Two transducers(one to transmit and the other to receive signal) are mounted in a case attached to one side of the pipe. A signal of known frequency is sent into the liquid to be measured. Solids, bubbles, or any discontinuity in the liquid, cause the pulse to be reflected to the receiver element, Fig. 10. Because the liquid causing the reflection is moving, the frequency of the returned pulse is shifted. The frequency shift is proportional to the liquid's velocity.