Monitoring of gas mixtures for food packages

Meat or fresh salads are packaged in a modified atmosphere so that they have a longer shelf life and do not turn brown. As standard, individual food bags are pierced after filling and the gas is tested in them. If the result is insufficient, the entire production must be disposed of. With the density sensor from TrueDyne, you can check the quality of the gas mixture in real time and directly in the packaging process – spot checks are no longer necessary and there is less waste.

1. gas cylinders for the filling of food packages (mostly CO₂ and N₂). 2. gas mixer. 3. the two gases A and B are mixed. 4. the DGF-I1 is integrated directly into the production process. The sensor measures the density of the gas mixture in real time and directly in the packaging process. 5. food is packaged in a protective atmosphere. If the density measured by the sensor deviates from the nominal value, production can be interrupted.

Density sensor DGF-I1 for gases

Measure the density of a gas directly in the gas pipe or in the gas tank: This is made possible by the DGF-I1 density sensor from TrueDyne. The heart of the sensor is a micromechanical system (MEMS system) with an oscillator in the form of a tuning fork. For the measurement, the metal housing surrounding the MEMS system is filled with the medium. The natural frequency of the oscillator varies depending on the density of the gas surrounding it. In order to compensate for temperature effects, a platinum resistor is built into the sensor, which precisely measures the local temperature.