Viscous Media

We specialise in the design, manufacturing and supply of a wide range of flow meters here at Litre Meter, stocking applications suitable for all kinds of materials and job specifications. 
As all fluids have different characteristics, some are better suited to certain flow meters than others. Finding the best flow meter for the job is influenced by the flow’s properties; its given pressure, temperature, temperature, density, conductivity and composition, for example. 
Our wide selection offers a number of applications that are suited to measuring viscous media, designed to avoid common problems of high viscosity materials like sticking to surfaces. When it starts to stick, this causes the movement of the liquid to slow down and become inconsistent, leading to inaccurate readings. 
However, there are certain types of flow technology that aid the movement of the liquid, including:
Rotary piston meter
Also known as positive displacement flow meters, rotary piston meters measure volumes of fluid by counting known fixed volumes repeatedly as a fluid goes in and out of the meter’s chamber.
It does this using an oscillating piston which divides the chamber into compartments containing an exact volume, making it easy for volumes to be monitored and measured accurately and efficiently. When more fluid is flowing, it turns faster.
This particular flow measurement application can be used for most fluids, as well as certain materials with high viscosity, including certain foods and butyl rubber. 
Vortex shedding
Using an oscillatory motion, vortex shedding detects provoked vortices made from the fluid in the meter to measure its velocity and rate, providing accurate readings for both low and high viscosity liquids. 
Vortex shedding induces fluctuations that create the vortices using the fluid’s own properties – for example, its pressure, density and viscosity. It’s with these vortices that the meter can calculate the volumetric flow rate.
Known as one of the best flow meters to measure water, vortex shedding is also suitable for accurately measuring other condensates that range in viscosity. 
Helical screw
Using the flow’s movement, a helical screw flow meter’s screws and gears rotate as the fluid goes through the meter. 
Inside a helical screw flow meter has two counter rotating gears that form a continuous constant volume cavity. This means that the flow rate of a fluid can be determined by the known volume within the cavity per revolution. 
Because very little force is needed to rotate the gears, helical screw applications are suited to fluids with a high viscosity.

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 and viscosities. 0.01 to 33,000 l/hr. +/-0.5% accuracy, +/-0.25% repeatability.
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.
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 flow metering. 0.2 to 100 litres per minute, +/-0.5 to +/-2% accuracy, +/-0.2% repeatability. OMG and OME versions in steel and aluminium can be selected for suitable process liquids and viscosities; +/-0.1 to +/-0.3% accuracy, +/-0.01% repeatability. 0.1 to 7500 l/min.