Noncontacting technology for safety switches
A
Schmersal UK product story
Edited by the Engineeringtalk editorial team
Oct 15, 2002
A new generation of noncontacting safety switches is said to be the first application of noncontacting functionality in safety switch design.
A new generation of noncontacting safety switches is said to be the first application of noncontacting functionality in safety switch design.
Whereas conventional safety switches are operated by a separate key-shaped actuator being inserted into an actuator opening, the actuating components of the Schmersal BZ16 have even and closed surfaces.
The new switch uses two signals - an inductive signal that is changed and transmitted back by the actuator, and a magnetic signal.
Both are received and controlled by a switching element that will only open or close the contacts of the switch if the electronic control signals are verified.
The combination of two different operating principles in a single switch guarantees high levels of safety while providing engineers with a number of design and operational advantages.
The even contact surfaces of the switch and actuator mean that once fitted, adjustment of the switch is unnecessary.
They also eliminate misalignment between the safety guard and doorframe, which can be a problem with conventional switches where a mechanical actuator must be inserted exactly into the switch.
The unit can be fully embedded to simplify integration into the machine and guarantee accessibility.
The noncontacting design also makes the BZ16 switch ideal for applications where hygiene is important, or where dust and dirt could enter a conventional actuator opening.
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