Flow measurement in an oil mill

Application Note | Food & Beverage

  • Determining the quantity of vegetable oil in production
  • Mass flow measurement of a non-conductive liquid
  • Control via PROFIBUS® PA interface


A food producer in Switzerland operates an oil mill for the manufacture of vegetable oil. The company extracts the oil by pressing the pulp of oil plants (olives, sunflowers, rapeseed). After pressing, the oil is cleaned and refined. The finished end product is then used in the food industry or for the manufacture of biofuel.

Measurement requirements

To measure the flow of the vegetable oil, the customer needed a flowmeter that could measure the volume of the non-conductive medium. The pressure loss caused by the measuring device had to be negligible in order to keep pump output low. The devices also had to be maintenance-free, easy to drain and easy to clean. As the PROFIBUS® PA was to take care of the entire process control, the measuring device also had to have an appropriate interface.

  • Medium: Vegetable oil
  • Process temperature: approx. 20 °C (max.: 90 °C) / 68 °F (max. 194 °F)
  • Pressure: 2 bar / 29 psi
  • Density: 0.88...0.93 kg/l / 55...58 lb/ft3
  • Viscosity: approx. 160 mPa•s
  • Measuring range: 0...30000 kg/h / 1102.3 lb/min

KROHNE Solution

KROHNE supplied the OPTIMASS 1300 C. This mass flowmeter is designed to measure the flow of non-conductive, slightly viscous liquids. The OPTIMASS 1300 is self-draining and, thanks to its twin straight measuring tube, causes only very minimal pressure loss. Compared to U-shaped mass flowmeters, the OPTIMASS 1300 features a compact design. The measuring device's PROFIBUS® PA interface transfers the measuring results to a control room.

Customer benefits

With the help of the OPTIMASS 1300, the oil mill operator can control his production processes. At the same time he benefits from a low-priced mass flow measuring device that features a space-saving design and comparatively high accuracy. There were no additional requirements when it came to installing the straight measuring tube device and no special knowledge was required on the part of the customer.

Products used


Coriolis mass flowmeter for universal applications and process control

  • For mass, density and volume flow of liquids and gases up to +130°C / +266°F
  • Also certified for hygienic use
  • Flange: DN15…100 / ½…4", max. PN100 / ASME Cl 600; many hygienic fittings
  • 3 x 4…20 mA, HART®, Modbus, FF, Profibus-PA/DP
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