Dosing liquid chocolate in the production of ice cream

Application Note | Food & Beverage

  • Filling waffle cones with a chocolate plug
  • Coriolis mass flow measurement to control a filling machine
  • Incorporation into the control system via a PROFIBUS® DP interface


At one of its locations in Germany, a milk processing company also produces milk ice cream. Ice cream in a waffle cone is one of the company's ice cream creations.

Measurement requirements

To help the waffle cones maintain their consistency over a long period of time and prevent them from getting soggy, a liquid plug is inserted before filling the cones with ice cream. Therefore, a filling machine fills each waffle cone with 4…6 gr / 0.13…0.2 US fl.oz. of liquid chocolate. The amount of chocolate used was not continuously measured in the past. The company had simply started up production and then taken random samples to gradually see when the desired filling level was attained. This resulted in a significant waste of product that could no longer be used due to quality issues. For this reason the customer was looking to find a technical solution to better control the filling process. Due to the specifications, a Coriolis mass flowmeter was the instrument of choice for this application. The possibility of entrained gas in the product flow meant that increased requirements were placed on the reliability of the measuring instrument. To enable smooth communication with the existing control unit, the measuring device needed to have a PROFIBUS® DP interface.

Medium Liquid chocolate
Flow rate 100 kg/h / 3.67 lb/min
Density 1.09 kg/m³ / 0.68 lb/ft³
Pressure 1 barg / 14.5 psig
Temperature +33…+37°C / +91.5...+98.5 °F
Viscosity 130 mPas

KROHNE Solution

The ice cream producer decided on the OPTIMASS 6400 F. The Coriolis mass flowmeter was supplied in stainless steel (316 L) with measuring tube size DN 8. It was installed with a hygienic process connection (milk thread as per DIN 11851) in the customer's horizontal dosing line. Because the flow of the chocolate depends on the temperature, the OPTIMASS 6400 was supplied with a heating jacket. This way the medium maintains the desired temperature range (+33…+37 °C / +91.5…+98.5 °F) and cannot solidify.

Unlike other mass flowmeters on the market, the OPTIMASS 6400 maintains operation with air or gas entrainments in the chocolate. It has been designed for applications with entrained gas thanks to the patented functionality of the "Entrained Gas Management" (EGM™).

The measuring tube for the device is EHEDG-certified and thus guarantees simple cleaning. The OPTIMASS 6400 is connected to the customer's control unit via its PROFIBUS® DP interface.

Customer benefits

With the help of the OPTIMASS 6400 the ice cream producer can now automate the dosing process, controlling the amount of chocolate used much more accurately. The result is not only consistently high product quality. Waste is also significantly reduced, allowing the customer to save on both resources and costs on a permanent basis.

The measuring device is very reliable and continuously maintains operation even in the case of entrained gas of up to 100 %. This saves the customer expensive process interruptions. The ice cream manufacturer is thus extremely satisfied with the technical advice, the design of the application and the performance of the KROHNE measuring device.

Products used

Food & Beverage version

Coriolis mass flowmeter for advanced food and beverage applications

  • High accuracy mass flow and concentration measurement in advanced dosing applications and process control
  • With Entrained Gas Management (EGM™) for applications with aerated products (e.g ice cream, dairy products etc.)
  • Also suitable for dosing of gases or cryogenic media (e.g in carbonation or food freezing processes)
  • FDA, EC1935/2004 conform; 3A, EHEDG certified