Safety Key

For critical industrial and medical applications

Patented switch solution

Combination of two technologies (optical and capacitive) for a safe release

Easy to use, elegant glass surface, flush front panel - these are characteristics that you can expect from a PCAP design. Unfortunately, there are situations where unintentional or unwanted activations of the PCAP touch screen occur, whether by electromagnetic interference or water wetting the front.

Security through redundancy

In critical applications, you want to be sure that no false activations occur. The Safety Key offers all the advantages of the PCAP sensor and combines it with an independent second level that monitors touch input with an optical measuring principle. Only the combination of two events leads to an operation being passed on to the system behind it.

Patent pending

The patent-pending process enables the development of high-quality surfaces with touch input and offers the security of a mechanical button. The Safety Key is not a finished product, but a demonstrator for the technology that can be integrated into your own products.

Infopaper: HY-LINE Safety Key

Security through redundancy

PCAP technology is widely used and has almost completely replaced other touchscreen technologies. Despite all its advantages, it also has a disadvantage: it triggers at the slightest operation, even if it was not intended. If a second touch technology is combined to compensate for this weak point, a far more reliable input medium can be developed. A message is only sent to the system if both touch technologies recognize a touch event in the same way.

The Safety Key, as presented here, is not a finished product, but a demonstrator for the technology that can be integrated into your own products.


The demonstration device displays the status of each channel with an LED for evaluation. In the target application, only the combined output is required, which triggers the desired switch event in the subsequent device. Since touch sensors work without haptic feedback, but this is desirable for ergonomic reasons, this output can also activate a vibration motor that gives the operating finger the feedback that the desired function has been triggered.


  • Insensitivity to EMC (radiated and conducted interference)
  • Insensitive to standing and draining liquids, including saline such as blood
  • Operability with and without (latex) gloves
  • No activation without touching the glass surface
  • Suppression of passing objects (fingers, coat, line)
  • Activation only when both sensors are detected
  • Haptic feedback
  • Passive: Milled finger recess
  • Active: Vibration by eccentric motor, exciter or piezo
  • Glass surface without breakthroughs for switches
  • contemporary design with printing
  • easy cleaning, as smooth surface
  • Resistance to cleaning agents

We are happy to demonstrate the safety key for your next project!


  • No unintentional activations
  • Two independent touch channels
  • Convincing and easy-care design in glass
  • Haptic feedback through finger recess and exciter
  • Demonstrator available
  • The HMI solution for safety-relevant applications
  • Operation and monitoring of medical electronics
  • Machine operation and industry 4.0
  • Critical infrastructure

The HMI solution for safety-relevant applications

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