Coriolis Flow Meter
Corioli’s mass flow meter has in recent years revolutionized fluid flow measurement with a measurement principle that is virtually independent of density, viscosity, temperature, pressure and flow profiles. The fact that the same measuring tube could measure both mass flow directly and density and temperature has given the Coriolis meter a new dimension in liquid flow measurement. The traditional Coriolis meters have also been shown to give good results on gas flow measurement within a very limited measuring range. A traditional sensor that has a liquid range of 1: 100 (turndown) will normally get a turndown of less than 1: 4 on gas.
The world’s first Coriolis painter
In 1996, AUTEK introduced the world’s first Coriolis meter designed specifically for gas flow measurement. It is based on a patented measuring principle where a single straight tube utilizes the first radial mode viberation. This gives a unique sensitivity needed for gas measurement. Turn-downs of more than 1: 100 can be achieved.
Coriolis fluid flow meters
The Coriolis meters use inertial forces and coriolis acceleration that occur when a particle moves in a rotating axis cross. The Coriolis meter vibrates so that it uses only a small sector of this rotation. The inertia forces and the coriolis acceleration cause a rotation of the measuring tubes that are proportional to the mass flow. The microprocessor-based electronics filter and process the signal to scaled pulses and standard 4 … 20 mA linearly with the flow rate.
The Coriolis meter is used for direct mass flow measurement on all types of liquids. It can also be used for gases, but the density should, as a rule of thumb, be higher than about 8 kg / m3. The Coriolis gauge incorporates an advanced density measurement that allows for the calculation of fractions and concentrations of liquids and solids. This together with the mass flow measurement can give the opportunity to totalize on the fractions flowing through the meter. Typical applications are Brix in sugar clay, Lut water / lye mixtures, dry matter in brown cheese production. Automatic mixing of skim milk and cream to the right fat. Dry matter in sludge etc.
AUTEK has delivered more than 500 Coriolis meters in Norway, of which more than 60 are on installations in the North Sea. This has given us a unique experience that we like to share with you. We delivered our first purchase / sale approved Coriolis installation in 1992 on hydrochloric acid. The Directorate For Measurement Technique has subsequently purchased / sold approved AUTEK’s system solution at Coriolis measures installations for eg milk, ice mix, cream, propylene, propane, lye, pyrolysis oil and hypochlorite.
Coriolis gas flow meters
For gas flow measurement, Coriolis meters based on radial mode vibration will have a unique advantage over the traditional Coriolis meters. Simple straight pipe gives the advantage of full pipe cross section and low pressure drop across the meter. Condensate will easily drain through the meter. Pipe breakage will not occur as the pipes are not inserted into bends such as traditional Coriolis meters, but corrosion or overpressure may occur so that the outer casing is designed to withstand full process pressure in the event of pipe breakage.