Chemicals, corrosive

At Litre Meter, we are specialists in designing, manufacturing and supplying flow measuring applications. With a wide range of high-quality flow meters on offer, we offer the best application for every material or requirement to guarantee you the most accurate results, whatever the job.(see also: Chemical Injection)

                                                                       

 Rotary Piston

The rotary piston flow meter is one of the most common choices to measure the flow rate of high viscosity materials. Using an oscillating piston, it is a highly accurate and efficient measuring device.

Also known as positive displacement flow meters, they work by counting the known fixed volumes repeatedly by using its compartments and its oscillating piston. This means that the volume can be monitored and measured easily to present you with accurate results.

Rotary piston flow meters can be used for most fluids, and is particularly good for measuring low flows as well as high pressure chemicals.

Pelton Wheel

Pelton Wheel flow meters work using a large blade area with ferrites and a sensing coil to measure the flow rate of all kinds of liquids. They are a great choice for jobs that need to monitor and measure very low flows, including highly corrosive chemicals.

As the flow enters the meter, the rotor begins to turn at a speed proportionate to that of the flow rate. The small sensing coil detects the ferrites on each tip of the blades as they pass, which is why the Pelton Wheel is also referred to as a radial turbine.

Vortex Shedding

Vortex flow meters use the behaviour of fluid oscillations to determine a fluid’s velocity and rate. It does this by utilising the fluid’s own properties in induce fluctuations in it, including its pressure, density and viscosity – to name a few. The fluctuations create vortices which the flow meter can detect to make its measurements.

Vortex flow meters have no moving parts, as well as a high tolerance to particulate flow. This is why they are a common choice of application for when the more traditional flow meter technologies are out of spec, for example if they need to deal with temperatures that very high or low.

Ultrasonic

By using ultrasonic waves, ultrasonic flow meters can measure the travelling times and the frequency shifts of a fluid. As the fluid enters the flow meter, the waves pass through the flow to accurately calculate the information needed.

Ultrasonic flow meters are known to work particularly well for measuring water and other liquids over a range of velocities, however can also provide accurate measurements for a certain amount of solid content too.

Turbine

Turbine flow meters use a vaned rotor to determine the average velocity of a fluid as it travels through it. This rotor is found inside the meter, centred on a shaft and rotatable on bearings. You’ll find that tube bundles support the shaft, helping to provide an element of flow conditioning and promoting accuracy in the reading.

These work well for low viscosity chemical flow metering, and are available in a range of sizes.

Helical Screw

Using the fluid and the fluid’s properties, the helical screw flow meter contains screws that rotate as the fluid flows through it. Inside, there are two counter rotating gears that create a continuous and constant volume cavity. This cavity with its known volume means that the flow rate of a fluid can be calculated using the number of revolutions.

Little force is necessary to rotate the gears making the helical screw a good application for a wide range of materials, including very high viscosity fluids.

Digmesa

From the stringent hygiene requirements of the manufacturing process to simple dispensing measurement at the point of sale, industry relies on flow measurement. At Litre Meter, we supply a range of Digmesa technologies that offer a cost-effective solution for those looking for a flow measuring application.

Whether you require cold drinks or beer dispensing, cellar auditing systems, coffee makers, or flow meters for vending machines, these Digmesa meters will help. They are ideally suited for low pressure chemical flow measuring using plastic bodies from Arnite, PEEK or PVDF. Contact us for more details.


VFF Rotary Piston 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 process liquids. 0.01 to 33,000 l/hr. +/-0.5% accuracy, +/-0.25% repeatability.
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 low viscosity chemical 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. +/- 1.5% 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 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).
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 low viscosity chemical 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 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 OMK is a stainless steel version suitable for water and chemical flow metering. 0.2 to 100 litres per minute, +/-0.5 to +/-2% accuracy, +/-0.2% repeatability.
Digmesa From the stringent hygiene requirements of the manufacturing process to simple dispensing measurement at point of sale the industry relies on flow measurement. The Digmesa range of technologies offer cost effectives solutions for many applications. Whether you require beer or cold drinks dispensing, cellar auditing systems, coffee makers (industrial and domestic) or flowmeters for vending machines these meters can help. Ideally suited for low pressure chemical flow measurement using plastic bodies from Arnite, PEEK or PVDF. From about 30 ml/min to 30 litres per minute. Contact factory for details. MOQ 100 units. +/-2% reading, +/-0.25% repeatability.