Ultrasonic double material detection

Double sheet detection during material feeding

An ultrasonic double material sensor monitors the passage of sound between the emitter and receiver. The evaluation distinguishes the state without material, one layer and overlapping layers. It is used for feeding sheets into printing, packaging and processing machines, where missing or multiple feeding needs to be detected.

How to choose a sensor for paper, film or sheet metal

• Material and layers: state the type of material, thickness or grammage and the required state when overlapping.
• Mounting: compare the distance between emitter and receiver, the position of the sheet and the installation angle according to the drawing of the specific model.
• Rychlost linky: the response and output pulse length must correspond to the passage time of the sheet and the PLC input.
• Electrical design: verify the supply, PNP/NPN outputs, NO/NC function and connection.

Pepperl+Fuchs UDC series in this category

The range includes versions UDC-18GM, UDC-18GMA, UDC-18GM50 and UDC-30GM. You can compare, for example, UDC-18GM-400-3E1 and UDC-30GM-085-3E3. Permitted materials and mounting conditions are assessed for the complete order code.

Is a double sheet sensor suitable for measuring thickness?

Its main task is to distinguish material states during feeding. For continuous thickness measurement, a measuring system with the corresponding specification must be chosen.

Technical document: Pepperl+Fuchs datasheet UDC-18GM-400-3E1.

Selection questions

What data are needed to choose double sheet detection?

Prepare a sample of the material, its thickness or grammage, feed speed and the available space for both heads. Compare the mounting distance, installation angle and the method of evaluating the individual states.

What should the sensor report for a missing or overlapping sheet?

Require distinction between the state without material, a single sheet and multiple feeding. When wiring, assign the outputs according to the manual of the exact UDC type and verify that the PLC captures the pulse at the highest line speed.

Selection and technical consultation

For selection or replacement, send the complete order code and a description of the application. TECHNOLINE technical support will help compare the required version.

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