Volumetric and gravimetric dosing

volumetric and gravimetric dosing

Volumetric dosing

Volumetric dosing involves measuring material based on its volume.

Volumetric screw feeders work by filling the appropriate space with material and releasing it in a specific portion. In the case of volumetric screw feeders, the efficiency of the device is determined by the speed of rotation of the screw with the guide pin or the spiral, while in the case of a weight belt dispenser – the speed of the belt is important.

Gravimetric dosing

Gravimetric dosing (loss-in-weight type) is carried out by devices that receive material in advance from the hopper or via another transporting device and accurately feed the material into the process with a certain efficiency.

Vibrating gravimetric screw feeders calculate the loss-in-weight of the bulk product in their hopper on an ongoing basis during feeding. Thanks to fast control systems and accurate strain gauges, a precise amount of material is delivered. They can operate in continuous mode (maintaining the set flow) and batch mode (batching, serving portions).

Gravimetric and volumetric screw feeders are used in various industrial industries where precise material dosing is crucial for the production process.

Properties of bulk materials

The characteristics and behavior of bulk materials differ with their physicochemical properties and the looseness measure. The critical parameters are bulk density, size, and type of grain, susceptibility to clumping, hanging, adhesion, and hygroscopicity. There is no universal way to dispense any material. Thanks to the use of various solutions and options, however, we can accurately dose even theoretically hard elements in administration.

Types of feeders

The easiest to feed are materials with high flowability. The selection of a suitable volumetric or gravimetric screw feeder’s feeding tool and drive parameters provide an efficient way to feed them. We use screws with a special design for easily aerated materials with properties similar to liquids. Materials with a tendency to clumping and sticking inside the tank require a separate agitator, which ensures high filling of the screw. Such an agitator can be built-in horizontally or vertically. Fragile and easily damaged materials must be handled gently. For them, the most reliable choice seems to be a vibrating feeder. For working in difficult conditions (e.g. cement, chemical, limestone industry) the DTC belt weigh feeder is perfect.

Constinous and batch feeding

Depending on whether your process requires a constant flow or a fixed portion of material, we have a solution for you. We offer screw, belt and vibratory dispensers that can be operated continuously or portioned.

Control systems

We equip all of our loss-in-weight feeders with Flex programmable controllers. If you already have a feeder and would like to upgrade it, we can implement it in your system. Flex is a modern control system equipped with a color touch screen and extensive communication options. The great advantage is the ability to modify the program and visualization, so you get a custom made product.