Flowmeters are used in a wide range of industries to measure the flow of a variety of materials. Fluids and gases all have different characteristics, meaning certain flowmeters are better suited to measuring certain materials than others.
A solvent is typically a liquid with a lower density than water. Whilst they vary in pressure and flow rates, solvents are best to be measured using the flowmeters mentioned below if you are looking for the highest level of accuracy and efficiency.
Rotary Piston meter
Also known as positive displacement flowmeters or PD meters, rotary piston meters measure volumes of fluid by repeatedly counting fixed volumes as the material passes in and out of the meter’s chamber. Inside this chamber is an oscillating piston, dividing the chamber into compartments which contain an exact volume. This makes the rotary piston meter an efficient and accurate solution for monitoring and measuring flow rates. It’s a versatile flowmeter, suitable for measuring a whole range of materials.
The Pelton Wheel or the Radial Turbine meter measures and monitors the flow rate of all kinds of low viscosity liquids. It does this by using a large blade area with ferrites and a sensing coil. As the flow enters the meter, the rotor begins to turn at a speed that is equal to the flow rate. The small sensing coil detects the ferrites on each tip of the rotor blades as they pass. Its large blades and ultra-low friction bearings make the Pelton Wheel particularly useful when it comes to measuring low flows.
A different type of oscillating flowmeter, Vortex Shedding meters induce fluctuations in fluids to create vortices. These vortices are detected by the meter to determine the fluid’s velocity and rate. Vortex Shedding has been found to be one of the best choices of flowmeter when it comes to measuring steam and fluids at high temperatures but it is not limited to this.
By using ultrasonic waves, ultrasonic meters can measure the flow rate of a variety of materials. These ultrasonic waves pass through the flow, measuring the travelling times and frequency shifts to determine the volume and rate. Ultrasonic meters are suitable for measuring the flow rate of water and other liquids, as well as a certain amount of solid content. There are two types of ultrasonic flowmeters – clamped-on and inline – which differ simply in the way that they are installed.
Axial turbine flowmeters are used to calculate the average velocity of a fluid. A Turbine flowmeter makes accurate measurements by using a vaned rotor located inside the device. The vaned rotor is centred on a shaft and allowed to rotate on bearing as the fluid travels through the meter. The shaft is also supported by tube bundles or a cruciform, providing a degree of flow conditioning for the fluid also.