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Safety door switch with separate actuator has been a very common safety device used widely by all machine manufacturers and users for emergency stop application in many industries. Prior to the introduction of safety devices, limit switches with actuating lever or proximity switches were used. However they could easily be by-passed by the operator. With the growing demand of safety fo the operator and uninterrupted process, need was felt to implement a limit switch which cannot be by-passed. This lead to the outcome of safety switches with separate actuator. The actuator is mounted on the moving door and the switch on the fixed frame of the door. When the door opens, the actuator comes out of the switch and thus gives a stop command to machine to avoid any access to the moving parts of the machine by the operator. However, this device requires mechanical engagement of the actuator and movement of the cam and hence the life is limited. Moreover, it is prone to malfunctions under dusty environment and there is also a chance of actuator breakage if the doors are misaligned during course of operation. In certain applications the size is too big for small acrylic doors and thus cannot have concealed mounting as per safety norms. The solution to the above is a \'safety magnetic switch\' which gets actuated by a coded magnet only. Here again the coded magnet is mounted on the guard door and the switch on the fixed frame of the door. The magnetic safety sensor is insensitive to lateral misalignment up to ±5mm. There are no mechanical movements involved and hence life-span increases manifold. Moreover it is available in small sizes making it suitable for small acrylic doors with concealed mounting. There are versions available in stainless steel meeting protection and hygiene standards, thus making it suitable for food & pharma industry or other applications where cleaning with high pressure water is required. The magnetic safety switches can come in either pre-wired cable version or a connector version as per the requirement.
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