In most industrial processes, the packaging process is automated. This not only minimizes the labor expenses associated with the process but also ensures the packaged products reach a precise quantity. There are several regulations on a product’s quantity in different legislation. In most states, if the fill is too low, companies will incur various penalties that cripple your business and will often cause most clients to opt for your competitors’ brands.

The best choice is to invest in a tabletop chain conveyor with an automated weighing technology. However, not all technologies are suitable for measuring quantities in liquid filling, though they feature a standard element; changes in pressure based on density and temperature. Here are the four technologies used for the filling of liquid products.

Gravimetric Filling

Here, an analog or digital cell will measure the weight of an empty container and its fill content. This load cell will use a strain gauge for the detection of the change of weight as the liquid is filled into the container. Since the load cell will weigh each container before the commencement of the filling process, it detects broken containers and those with some cleaning agents or disinfectant residue present and removes them. If the weight of the product is also not increasing as it should, this might indicate a leaking container, and the filling machine will automatically halt the process to avoid its contamination.

Level Sensor Filling

Here, a level sensor will be inserted into your container and the liquid filled until it reaches the sensor. This filling method is thus only suited for liquids with a minimal salt content like mineral and plant oils. Measurement of product quantity using the level sensor is, unfortunately, an inaccurate measurement method since the container’s volume will fluctuate dramatically, and even more so with glass containers. It is, however, the best choice for carbonated liquids that use isobaric filling since these will lose their carbon dioxide content in other filling technologies.

Volume Measurement

This technology will detect the liquid quantity flowing through filling valves. Magneto-inductivity will be used for measuring the liquid volume in your container. This involves a magnetic field that will split the liquid’s ions and generate a voltage that can be measured and used for calculating the volumetric flow rate. Volumetric measurement is only used for conductive fluids, and the machine should be calibrated individually to reflect the ions in different liquids.

Mass Flow Measurement

Liquid filling conveyor system

This relies on the theory of the Coriolis force.  The liquid will flow into a container via two vibrating pipes, while the Coriolis force that acts on these pipes will generate a measurable shift in the pipes’ vibrations. This way, the liquid flowing through the pipes will be calculated. Mass flow measurement is expensive and only used for non-conductive liquids.

Most manufacturers opt for safety overfilling to minimize the risk of penalties associated with underfilled products. While it might seem like a foolproof option, it is an expensive one in the long run. The above weighing technologies are the best for guaranteeing the right product quantity with minimal impact on your production expenses and for maximizing your profits.

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