Litre Meter specialise in the design, manufacture and supply of flowmeters. The unique Pelton wheel based meter design ensures an inherent reliability which has been proven in more than three decades of operation. Listed below are all the flow meters within our range that are suitable for water flow:
Different fluids have different characteristics; they vary in given pressure, temperature, density, conductivity, composition to only mention a few.
Water is the transparent fluid made up of hydrogen and oxygen, forming the world’s streams, lakes, ocean and rain. It’s a liquid at standard ambient temperature and pressure but can also be seen in a solid state (ice) and a gaseous state (steam), as well as existing as snow, fog, dew and cloud.
Our range offers a number of different flow meters that are suitable for water, including:
Rotary piston meter
Rotary piston meters, also known as positive displacement flowmeters (PD meters) measure volumes of fluid by counting repeatedly known fixed volumes as they go in and out of the meter’s chamber.
The chamber contains an oscillating piston which divides the chamber into compartments containing an exact volume, meaning that the volume can be monitored and measured easily.
Perfect for measuring low flow, high pressure chemicals or hydraulics, positive displacement flowmeters are used for most fluids including water, as well as polyisobutene.
Also known as a radial turbine, the Pelton Wheel measures and monitors flow rates by using a large blade area with ferrites and a no-drag sensing coil.
As the flow goes into the meter, it is directed by a jet onto the rotor which turns at a speed in proportion to the flow rate. The small sensing coil detects the ferrites of each of the rotor blades’ tips as they pass.
Due to the large size of each blade and ultra-low friction bearings, this flowmeter is ideal for jobs that require the measurements of very low flows.
Like all oscillatory flowmeters, vortex shedding detects provoked vortices made from the fluid to determine its velocity and rate.
Vortex shedding uses the fluid’s own properties, like its pressure, density and viscosity, to induce fluctuations that create the vortices that help to calculate the volumetric flow rate.
Due to its ability to measure low viscosity liquids and volumetric flow rate, vortex shedding has been found to be one of the best choices to measure water or other condensates accurately.
To determine the flow velocity, these flowmeters use ultrasonic waves that pass through the flow measuring the travelling times or the frequency shifts.
There are two types of ultrasonic flowmeters - clamped-on and inline – and they differ by the way they are installed.
Ultrasonic flowmeters can measure water and other liquids, as well as a certain amount of solid content.
Turbine flowmeters are used to calculate the average velocity of a fluid, detecting the vaned rotor as the fluid travels through the meter to make an accurate measurement.
Found inside the meter, the vaned rotor is centred on a shaft and allowed to rotate on bearings. The shaft is also supported by tube bundles or a cruciform which provide a degree of flow conditioning for the fluid, improving the accuracy of the reading.
It’s a great choice of flowmeter for water due to its wide size range and its excellent precision.
A helical screw flowmeter is controlled by the fluid itself – as the fluid flows through the meter, the helical screws inside are forced to rotate.
Inside, there are two – normally identical - counter rotating gears that form a continuous constant volume cavity, meaning that the flow rate of a fluid can be determined by the known volume within the cavity per revolution.
Very little force is needed to rotate the gears ensuring that pressure drop is kept to a minimum, and as a result they are a great option for higher viscosity fluids, too.