• Protocontrol Instruments (India) Private Limited

Zero/Under Speed/Over Speed Switch

Electronic Speed Switch Series ESM is used to monitor speed of conveyers, crushers, rolling mills, agitators, mixers, stirrers, screw conveyers bucket elevators and other industrial machinery. The device actuates relay contacts at preset speed and by using these contacts, desired control action such as zero speed protection / under speed protection / over speed protection can be achieved. Speed sensor is placed in close proximity of the rotating object. Sensor detects presence of metal objects, which come within the range of their oscillating field giving rise to corresponding pulses. These pulses are fed to the control unit where they are compared with the standard pulses to sense the speed.