Dazic Speed Switch CI 2120 A1 Type BL

The Dazic Speed Switch CI 2120 A1 Type BL is a robust, electromechanical device designed for monitoring the rotational speed of industrial machinery, such as conveyors, elevators, and rotary equipment. Manufactured by Dazic Controls Corporation (now part of Electro-Sensors, Inc.), this zero-speed switch detects under-speed or stopped conditions to prevent equipment damage, material spillage, or safety hazards. It operates by coupling to a rotating shaft via its input shaft, and upon detecting speed below a preset threshold, it activates a switch to signal alarms, shutdowns, or controls. Key features include a durable cast iron housing for harsh environments, non-contact magnetic sensing for reliability, and adjustable speed settings typically ranging from 0.5 to 500 RPM. Advantages over similar products include its explosion-proof variants for hazardous areas, simple installation without complex electronics, and long-term durability in dusty or vibrating conditions. However, it may require periodic maintenance due to mechanical components, and it's less precise than modern digital tachometers. Applications span mining, agriculture, and manufacturing for overspeed/underspeed protection. This model supports AC/DC contact ratings, making it versatile for various control systems. Overall, it's a cost-effective, reliable choice for legacy systems needing basic speed monitoring.