Ultrapure Water

As specialists in the design, manufacturing and supplying of flow measuring applications, Litre Meter provides top of the range flow meters suitable for all jobs, as well as a wide selection of materials.

Different materials – whether gas or liquid – have different characteristics. Their given pressures will differ, as well as their temperature, density, conductivity, and composition for example. This is why we offer a variety of flow meters, because some are better suited to certain fluids than others.

Below, you can find the ideal flow meters for measuring ultrapure water. Predominantly used in power and pharmaceutical industries, ultrapure water needs to stay pure and deionised for both safety purposes and accuracy of analysis.

These flow meters ensure that the fluid is not contaminated during the measuring process, maintaining its ultrapure state.


Pelton wheel

The Pelton Wheel, also known as a radial turbine, is the ideal choice for measuring and monitoring low-viscosity liquids like water.

It uses a small sensing coil to detect the ferrites found in the application’s rotor blade tips as they turn at a speed in proportion to the flow rate. The Pelton Wheel’s large blades make it suitable for measuring very low flows. The ferrites are sealed in ensuring they do not come into contact with the liquid.

With its sapphire bearings, this flow meter provides a non-metallic and low-friction solution to measuring the fluid, making it ideal for ultrapure water.

Vortex Shedding

All oscillatory flow meters, like Vortex Shedding, work by detecting provoked vortices that are made from the fluid to determine its flow rate and velocity.

As it uses the fluid’s own properties (its pressure, density, and viscosity for example) to induce the fluctuations to make its calculations, it runs no risk of contaminating ultrapure water of other particles or gases.

It’s well known as one of the best choices to measure volumetric flow rate and low viscosity liquids like water and other condensates.


Ultrasonic flow meters use ultrasonic waves to measure the travelling times and the frequency shifts of a flow.

The waves pass through the flow to accurately calculate the information, and work particularly well for measuring water and other liquids.

There are two types of ultrasonic flow meters, clamped-on and inline, which differ in the way that they are installed.


Using a vaned rotor, a Turbine flow meter can accurately measure the average velocity of a fluid as it travels through it.

The vaned rotor is found inside the meter where it is centred on a shaft and allowed to rotate on bearings. Tube bundles support the shaft, which provide an element of flow conditioning, aiding the accuracy of the reading.

The reason it is a great choice for water is its wide size range and excellent precision, as well as the ability to maintain ultrapure water. Litre Meter normally select a hard carbon composite bearing suitable for pH levels below 6.

Pelton Wheel 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 ultrapure water 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.
Vortex 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% rate, 1/2" to 8" and insertion.
Ultrasonic 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 ultrapure water over a range of velocities. 25mm to 10000mm;±1.0% of reading (also 0.5%); 0 to ±40 ft/s (0 to ±12 m/s).
Turbine 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 ultrapure water 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.