Cement Hoppers signal switch for fixed measurement silo material level, it has anti-adhesion, high temperature, adjustable sensitivity characteristics. Cement Hoppers signal switch is mounted on the bottom or top of the silo, enabling short positions or warehouse full of alarm, or at some distance (about 1 meter) to install one, you can estimate the silo material level, but also with access to materials interlocking equipment, automatic start and stop conveying equipment to achieve the purpose of automatic control system, if applied to the computer ingredients, you can greatly improve product quality, increase production efficiency.