License to fill: ultrasonic level control on a tertiary crusher siemens.com/sitransLUT400 This is our mission, should we choose to accept. The location? A tertiary crusher at Torr Works, an Aggregate Industries lime- stone quarry in Somerset, England. Our challenge? Measuring levels in a dusty environment with 100 millimeter (3.9 inch) rocks whizzing by, and – not surprisingly – a lot of noise. The solution? SITRANS LUT400 ultra- sonic cont

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