Non-contact switch with innovative diagnostics

03 August 2021

The Altech SRF (Safety RFID) is a non-contact safety sensor that monitors movable safety guards, such as doors, gates, panels and hoods. This compact sensor protects operators from injuries by shutting down or preventing the start up of machines when the safety guards are not properly closed.

Sensor and Actuator

The sensor and actuator feature a compact housing design that has a diagnostic LED and protection rating of IP69. One actuator part number is used for all the coding types and is programmable without additional devices. The actuators are sold separately.


There are two different levels of diagnostics available. PNP diagnostics offer a PNP NO output that indicates whether the safety guard is opened or closed. DCD (daisy chain diagnostics) offer much more detailed information providing over 20 different types of diagnostic information via an internal bus system that can be accessed at the end of the series cable. This data can be accessed by the machine’s control system via I/O Link and can be displayed on a Android Smartphone or tablet using NFC (near field communication) technology. Both levels of diagnostic systems operate independently of the safety outputs.

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