Measuring the flow of liquid animal fat

Application Note | Food & Beverage

  • Loading hot liquid fat from animal remains
  • Coriolis mass flow measurement of non-conductive medium with highly fluctuating density
  • Accurate loading of tanks


A waste management company specialises in using animal by-products such as bones, fat and rind. The company operates a treatment facility in which category 3 offal and slaughter by-products are processed into high-quality protein meal and fats used in pet food and agriculture.

Measurement requirements

For delivery purposes, the company needs accurate truck loading of its liquid animal fat products.

Medium : Liquid fat
Flow rate : Up to 48 t/h
Density : approx. 0,8 kg/l/ 6.67 lb/gal (US)
Temperature :  +50…+100°C/ +122…+212°F

The density of the hot fat can vary considerably during loading depending on the quality and composition of the animal by-products. The customer had previously been using a competitor's electromagnetic flowmeter to determine the load amount. Due to the very low conductivity of the medium, this instrument was, however, unable to guarantee a stable measurement. And as this measuring device primarily determined the load amount as a volume, it did not take into account the varying density of the fat. When converted to mass, this also resulted in measuring inaccuracies with regard to the actual quantity of fat loaded. The customer, therefore, decided to replace the electromagnetic measuring device with an instrument that could determine the mass more accurately and directly.

KROHNE Solution

The customer opted for the OPTIMASS 1400 F. The Coriolis mass flowmeter was installed directly in the pipe (DN 50) at the loading point. The measuring instrument features a stainless steel twin measuring tube and was supplied with a remote converter for this application. In addition to mass flow, he OPTIMASS 1400 also calculates density and temperature as direct parameters.

KROHNE also provided a preselection counter at the customer's request. This is connected to the OPTIMASS 1400, allowing the exact load amount to be preset. As soon as the relevant amount of fat is reached, the flow is controlled accordingly or stopped via the preselection counter.

Customer benefits

Using the OPTIMASS 1400 allows the company to accurately determine the mass of the animal products when loading the trucks. The measuring device operates irrespective of the conductivity of the medium and takes into account the varying density directly. This means no more of the familiar measuring errors during the loading process. With the OPTIMASS 1400, the customer benefits from the most accurate measuring device in its price and performance category. Thanks to the compact twin tube design of the OPTIMASS 1400, the measuring device was also easy to install without having to make costly changes to the existing infrastructure. The customer also benefits from the measuring point being fully equipped by KROHNE. Besides the mass flowmeter, KROHNE also supplied a suitable preselection counter for accurate presetting and control of the load amounts.

Products used


Coriolis mass flowmeter for universal applications and process control

  • Mass, density and volume flow of gases and liquids; maintains operation over a wide range of gas fractions and complex flow conditions (EGMTM)
  • Also certified for hygienic use
  • Flange: DN15…100 / ½…4", max. PN100 / ASME Cl 600; many hygienic fittings
  • 3 x 4…20 mA, HART®7, FF, Profibus-PA/DP, Modbus, PROFINET, EtherNet/IP™, Bluetooth®