Paddle Switch Level Measurement

Paddle Switch Level Measurement

Paddle switch level measurement is an electromechanical point level detection method for bulk solids. It is commonly used for full, empty, and demand alarms in silos and bins where a simple, direct switching function is required.

A motor drives a rotating paddle inside the vessel. When bulk material covers the paddle, rotation is impeded; that mechanical resistance actuates a relay, producing a discrete switching signal. The resulting behavior is intuitive and does not require complex parameterization.

Key benefits include suitability for simple applications and the absence of calibration requirements. Robust housing and compact mechanical design support use in industrial solids services, including areas where dust explosivity constraints influence sensor selection and construction.

Typical applications include powders, granulates, and flowing bulk solids, including services with larger particle sizes (within the practical limits of paddle designs). Paddle switches are frequently chosen as a dependable alarm device for high/low level interlocks, baghouse hoppers, day bins, and intermediate storage silos.

Engineering considerations include verifying bulk density and flow characteristics, installing at locations that represent the intended switching point (and avoid direct fill streams), and confirming mechanical clearances to prevent damage from lumps or foreign objects. While not a continuous measurement technology, the paddle switch remains a proven building block for straightforward bulk solids alarm and control architectures.

Engineered Equipment Company, a leading supplier of specialized industrial equipment.