For the efficient manufacture of textiles and fabrics, the thickness of material needs to be measured immediately after its formation to enable real-time adjustment of the production process. Therefore, a manufacturer of specialised textile-testing machines uses a high-accuracy sensor to measure the thickness of a continuously produced sheet, or web of material moving at up to 5m/s (16.4fps).
Measurements are required across the full width of the textile web, which can be up to 4 metre (13ft) wide. To achieve this a sensing head is mounted on a transverse-axis carriage which lies immediately above a fixed roller, traversing the width of the web as it passes over the roller. In this application, the precision sensor is providing real-time measurements in the range 0 to 4mm with a resolution of 0.02mm (0.0008”) or better.
High-frequency measurement is provided to accommodate the speed and width of the moving web. A continuous analogue output is necessary as conventional digital sensors do not provide the required resolution.
Contrinex’s Analogue Output Inductive sensors are highly accurate and provide the continuous voltage or current outputs required for this application. The quasi-embeddable sensors feature a chrome-plated brass body and PBTP sensing face, with the M18-diameter sensor allowing sensing distances up to 10mm (0.4”) with resolution in the µm range.
The sensor, mounted in the sensing head, moves rapidly back and forth across the web and senses through the material of the web as it feeds over the roller. It measures the distance from its sensing face – which lies a known distance from the bottom face of the head, to the top surface of the roller. It delivers a precisely calibrated, near-linear, discrete output in the range 0 to 10V or 4 to 20mA.
The Contrinex inductive sensor has a sealed cable entry, ensuring fit-and-forget capability during extended periods of operation, and connects with the machine’s control system via a flexible PUR-sheathed cable. Using a custom-configured software interface, output data is displayed numerically and graphically on a screen, allowing real-time adjustment to the production process when necessary.
Contrinex’s Analogue Output sensors provide a cost-effective solution that satisfies the customer’s requirements for accurate high-speed measurement with an exceptional resolution. These analogue inductive sensors are used on an almost unimaginable array of applications and industries.
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