Abstract: A device for measuring the thickness of a sheet or web product including at least one moveable measuring sensor which can be pressed against the product while forming an air pad between measuring sensor and product. At least one measuring sensor is respectively provided on both sides of the sheet or web product. The thickness of the respective air pad can be measured, the total gap thickness including the thickness of the two air pads and the product thickness can be measured. Elements are provided for calculating the product thickness by subtracting the thickness of the air pad on the two product sides from the measured total gap thickness.

Abstract: Sensor and process for measuring mass of water on a sheet forming fabric. The sensor includes a microwave element positionable to couple an electromagnetic field into a stock layer to be measured, and a microwave signal generator coupled to the microwave element to generate, in the microwave element, a microwave signal having a frequency lower than a relaxation frequency of water. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: A device for measuring at least one property of a material web, in particular a paper or board web, includes movable measuring probes provided on both sides of the web, which can be pressed against the web with preferably at least substantially equal force, forming a respective air pad, elements for measuring the air pads, in particular the air pad thickness, on both sides, and at least one property sensor, in particular a paper property sensor, fitted to a measuring probe supported by an air pad.

Abstract: A device for measuring the thickness of a sheet or web product including at least one moveable measuring sensor which can be pressed against the product while forming an air pad between measuring sensor and product. At least one measuring sensor is respectively provided on both sides of the sheet or web product. The thickness of the respective air pad can be measured, the total gap thickness including the thickness of the two air pads and the product thickness can be measured. Elements are provided for calculating the product thickness by subtracting the thickness of the air pad on the two product sides from the measured total gap thickness.

Abstract: A device for measuring at least one property of a material web, in particular a paper or board web, includes movable measuring probes provided on both sides of the web, which can be pressed against the web with preferably at least substantially equal force, forming a respective air pad, elements for measuring the air pads, in particular the air pad thickness, on both sides, and at least one property sensor, in particular a paper property sensor, fitted to a measuring probe supported by an air pad.