Type of flow Meter
Type and Model of Flow Meter
Measuring the flow of liquids is a critical need in many industrial plants. In some operations, the ability to conduct accurate flow measurements is so important that it can make the difference between making a profit or taking a loss. In other cases, inaccurate flow measurements or failure to take measurements can cause serious (or even disastrous) results.
With most liquid flow measurement instruments, the flow rate is determined inferential by measuring the liquid’s velocity or the change in kinetic energy. Velocity depends on the pressure differential that is forcing the liquid through a pipe or conduit. Because the pipe’s cross-sectional area is known and remains constant, the average velocity is an indication of the flow rate. The basic relationship for determining the liquid’s flow rate in such cases is:
Q = V x A
where
Q = liquid flow through the pipe
A = sectional area of the pipe
Turbine Flowmeter 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.
Features :
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.
The turn down ratios may be more than 100:1 if the turbine meter is calibrated for a single fluid and used at constant conditions. Accuracy may be better than +/-0,1%.
Electromagnetic Flow meter
An electromagnetic flowmeter operate on Faraday’s law of electromagnetic induction that states that a voltage will be induced when a conductor moves through a magnetic field. The liquid serves as the conductor and the magnetic field is created by energized coils outside the flow tube.