Water Flow Meters UK

Here at Litre Meter, we specialise in the design, manufacture and supply of flowmeters. Listed below are all the flow meters within our range that are suitable for water flow.

We are especially proud to offer you the unique Litre Meter Pelton wheel based meter design. This top-of-the-range piece of equipment ensures an inherent reliability which has been proven in more than four decades of operation.

We only stock the highest quality products so you can be sure to find the best deals here for buying water flow meters. Take a look at our impressive selection of water flow rate meters, we’re sure you’ll find the product you’re looking for.

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Rotary Piston Meter

Positive displacement flowmeters, also known as PD meters, measure volumes of fluid flowing through by counting repeatedly the filling and discharging of known fixed volumes. A typical positive displacement flowmeter comprises a chamber that obstructs the flow. Inside the chamber, a rotating/reciprocating mechanical unit is placed to create fixed-volume discrete parcels from the passing fluid. In the VFF the rotor is basically a disc shape with an annular groove on its underside capable of holding and transporting flow from the chamber inlet to the outlet i.e. a rotary piston. The units are manufactured in 316 stainless steel or titanium. They can measure pulsing flows. Suitable for a wide range of fluids from Methanol to Epoxy resin. 0.01 to 33,000 l/hr. +/-0.5% accuracy, +/-0.1% repeatability.

Pelton Wheel Meter

Also known as a radial turbine the highly efficient Pelton Wheel meter has some major advantages. The very large blade area compared with the flow inlet port size produces an exceptionally wide range flowmeter which can measure very low flows. The flow through the inlet of the meter is accurately directed onto the rotor which rotates at a speed in linear proportion to the flow rate. A small sensing coil detects the ferrites mounted in the flow meter rotor blade tips as they pass. No drag is imposed on the rotor which assists in the measurement of extremely low flows. Sapphire bearings provide a very low friction mechanically-robust bearing with long life characteristics. Turndown can be as high as 280:1. Ideally suited for low viscosity constituents measurement up to 2″ pipe sizes and larger and up to 10cSt. 0.003 to 500 l/min; ±2.0% of reading (also 1.0%); some models suitable for flow measurement at higher pressure.

Thermal Mass Capillary Meter

The Capillary Thermal principal of operation is based on heat transfer and the first law of thermodynamics. During operation, process gas enters the instrument’s flow body and it divides into two flow paths. The vast majority of the gas flow passes through the Laminar Flow Element (LFE) bypass. A very small portion of the total flow is diverted through a small “Capillary” sensor tube with an ID between .007 to .028 inches. This technology is ideal for gas flow measurement and gas flow control. Flowmeter accuracy: ±1% of full scale. From 0.1 to 4 sccm up to 1000 slpm.



Thermal Mass Industrial Meters

The immersible thermal sensor is completely immersed into the flow stream. As a result, immersible thermal mass flow meters measure much higher gas mass flow rates in harsher environments than capillary thermal mass flow meters. There is very little pressure drop across an immersible sensor, and the flow does not have to pass through the LFE as it does with a capillary thermal mass flow sensor. Available from Sierra in either inline flow bodied or insertion flowmeter styles. In-line mass flow meters from 0 to 0.7 nm³/h to 0-20000 nm3/h, +/-1% of reading; insertion flowmeters up to 72″, +/- 2% of reading.



Vortex Mass Meters

Vortex and other types of ‘oscillatory’ flow meters utilize the behaviour fluid oscillations in order to derive flow rate. This technology works by inducing fluctuations in the fluid properties such as pressure, density or viscosity which can be converted into a flow rate. These flowmeters are normally calibrated on water. No moving parts and relatively tolerant to particulate flow these find many applications where temperatures are high or where other more traditional flowmeter technologies are out of spec. +/- 1.5% rate, 1/2″ to 8″ and insertion.


Ultrasonic Flow Meters

Ultrasonic flowmeters measure the travelling times (transit time models) or the frequency shifts (Doppler models) of ultrasonic waves in a pre-configured acoustic field that the flow is passing through to determine the flow velocity. The Sierra range of ultrasonic (transit time) Innovasonic devices are available, click for details. Litre Meter has access to other ranges but the Innovasonic is relatively unique as not only are fixed and portable ultrasonics available but also insertion devices for tougher applications. Ultrasonic flow meters can measure water and other liquids over a range of velocities and with a certain amount of solid content. 25mm to 10000mm;±1.0% of reading (also 0.5%); 0 to ±40 ft/s (0 to ±12 m/s).


Ritter Gas Meters

Ritter manufacture a range of gas meters including the TG series drum-type, BG series bellow type and the unique MGC Milli Gas Counter.


Turbine Meter

Inline ‘axial’ turbine flowmeters are velocity measuring devices – they measure the average velocity of a fluid flowing through the body of the meter. Mounted within the body of a liquid turbine flowmeter is a vaned rotor. The rotor is centred on a shaft and allowed to rotate on bearings. The shaft is supported in the housing by tube bundles that also provide a measure of flow conditioning for the fluid stream. Good for low viscosity epoxy and catalyst flow metering. Wide size range and excellent accuracy. 0.24-17 up to 3028-56775 litres/min. Overrange 150% intermittent. ±0.25% reading – typical. ±0.1% repeatability.

Helical Screw Meter

Positive displacement flowmeters, also known as PD meters, measure volumes of fluid flowing through by counting repeatedly the filling and discharging of known fixed volumes. A typical positive displacement flowmeter comprises a chamber that obstructs the flow. Inside the chamber, a rotating/reciprocating mechanical unit is placed to create fixed-volume discrete parcels from the passing fluid.

The helical screw principle uses 2 counter rotating gears to form a continuous constant volume cavity. The SRZ is a stainless steel version suitable for high viscosity and abrasive media flow metering. 0.04 to 400 litres per minute, +/-0.1% accuracy, +/-0.05% repeatability. Housing in 316L and 303 with screws in 1.4122 (430), tungsten carbide bearings and FKM or PTFE seals. Pressures to 400 bar, -40°C to 150°C.

How do Water Flow Meters Work?

Water flow meters measure the amount of water that flows past the systems sensors. The flow meter working principle is the same for any material: to produce precise, repeatable measurements for a specific application. 

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.

Simply put, the technology used in water flow meters (water flow sensors, flow switches etc.) is optimised specifically for measuring the flow of water, as opposed to other liquids. This includes rotary piston meters, pelton wheel meters and ultrasonic flow meters.

Conducting a Water Flow Test

Using one of our flow meters is the easiest way to conduct a water flow test. It helps you keep an eye on the flow rate, so you can make sure that it doesn’t get too high and cause damage to your system or pump.

Once you’ve established the amount of water being drawn per minute, you multiply this figure by the draw time and adjust to determine an hourly draw rate. This will also give you the total water volume drawn.

How do you Use a Water Flow Sensor?

There are a variety of different sensors available on the market today, but they all have the same working principle. A valve lets water pass through to the pipe where a sensor (fitted with, for example, a hall effect sensor) senses a rotor and measures the flow.

They work slightly differently in different flow meters. For example, mechanical flow meters work by water passing through it causing a turbine to rotate. The volumetric flow can be worked out by measuring the rotational speed of the turbine. 

Vortex flow meters work have a sensor immersed in the flow which measures the vortices of the water flowing; ultrasonic flow meters measure flow by calculating the difference in time it takes an ultrasonic pulse to travel up and downstream.

All our flow meters’ working mechanisms are explained in more detail in their product descriptions. Don’t hesitate to get in touch with us to help you find out which system best suits your requirements.

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