Grinding gypsum rock into a powder is one step in producing drywall. The gypsum rock is conveyed to a feed bin above a grinder. The grinders provide a constant supply of gypsum powder to the mix tanks that produce the gypsum slurry used to form the drywall board. A plugged chute requires immediate attention to ensure a constant material supply. Measuring granular materials in a chute is an extreme environment for any sensing element. G

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