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Web Tension System Design |
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Vishay BLH offers web tension system solutions for Ultra Low, Low, and High Tension applications. Most web tension transducer manufacturers rely on semiconductor strain gages which, unfortunately, have many limitations. In high tension applications they can be severely affected by temperature, steam, corrosive gases, chemicals and many other common contaminants, and in low tension applications they offer very limited rangeability. Vishay BLH transducers incorporate SR-4® Foil Strain Gages connected into a full wheatstone bridge that is temperature compensated and dead weight calibrated to deliver accuracy, high-performance and reliability. They feature superior sealing to stand up to the hostile environments of high tension applications. In low tension applications, they provide rangeability that is often 10 times greater than transducers built with semiconductor strain gages with no need for recalibration. |
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HTU Load Cell systems, when combined with a custom DXp-40 transmitter, precisely measures the resultant force of any web tension system, independent of wrap angle or changes in wrap angles. Force sensing elements located on each transducer end measure both the horizontal and vertical force components which produce total tension. Resultant output signals can be used to determine the magnitude and direction (H) of the overall force (FR) applied by the web (see animation below). Two full wheatstone bridges are mounted internally to each tubular cross section to provide independent sensing for each axis as well as protection from hostile environments. After calculating total resultant web tension force based upon both HTU outputs, the custom DXp-40 provides a high resolution, 16 bit analog signal for driving the system motor/clutch. |
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