The PK52 stands out within the Presskey family in terms of its external features: an extremely large touch surface, very good lateral recognition of the status display and an acoustic orientation signal. These are just a few examples that facilitate the awareness of TSL-ESCHA’s PK52 push buttons and greatly simplify safe operation. Braille and self-explanatory pictographs also support tactile and visual recognition. The improved operational characteristics are particularly helpful for passengers with reduced mobility in buses and trains.

The individual needs of door manufacturers and vehicle operators were also taken into account during development. Therefore, the PK52 is available in different variants. The most frequently selected version has a nominal voltage of 24 VDC with sound (2 to 5 kHz). A version with a nominal voltage of 12 to 24 VDC is available without sound.

Another variant of the PK52 can realize almost all functions and special requirements regarding light signals and sound signals (nominal voltage 24 to 110 VDC, with sound from 900 Hz to 5 kHz).All of these functions can be parameterized thanks to the integrated micro-controller.  It is possible to display different light patterns that, help passengers with a red-green weakness perceive the light signals. First three red LEDs light up and then three green LEDs at another position. A 4:2 change is also possible. EN 14752 is fulfilled thanks to this change of position and color. The PK52 also meets the other criteria stipulated by this standard. Various switching functions allow the customer-specific composing of the PK52.

TSL also offers the additional function with a timer setting for the light signals, the so-called sandglass effect. When the door is released, the green LEDs light up. However, as soon as the push button is pressed, all red LEDs light up, which then turn off one after the other in a defined cycle. This happens while the gap bridging extends from the door to the platform and the door remains closed. This feature of the push button clearly indicates the waiting time to the passenger until the door opens.

PK52 for installation in glass doors

PK52’s stainless steel front panel conceals the screws. This offers considerable advantages in many areas, such as preventing unauthorized persons from dismantling the push buttons. The powder-coated panel is available in various RAL colors so it can be harmonized with the vehicle design. The powder coating is particularly durable, thus helping the push button to maintain its good appearance and ensuring a lasting contrast. Therefore the EN 16584 standard is permanently fulfilled.

The PK52 can also be used as an emergency button, for example in lavatories, by combining it with a triangular plate. The TSL push button thus complies with the EN 16683 standard.

The PK52 push button is now also available for the installation in glass doors of buses and trains. The new variant with a spacer ring that adapts to different door profiles is available with double-sided function and single-sided function with a blind cover.

PK52 push button product highlights

  • Large active touch surface (Ø52 mm) with plane or tactile protection cap
  • Invisible fastening elements, enhanced protection against manipulation by unauthorized persons
  • Solid stainless steel front panel
  • Versatile parameter setting thanks to integrated micro controller (not for all variants)
  • Tactile switching feel
  • Variant with potential-free output
  • Proven chemical resistance to many surface cleaners
  • Can be mounted from the front side and comes equipped with a cable outlet for optional plugs
  • Complies with the current standards for rail vehicles (TSI-PRM, EN 14752, EN 50155, EN 45545-2 and EN 61373)
  • Complies with the “Methodologies for assessing contrast” requirement according to the EN 16584-1 standard
  • Coating resistant to graffiti remover for touch surface (optional)
TSL-ESCHA’s PK52 door opening push button

The PK52 push button series stands out due to its extremely large touch surface.

Switching principle
  • 3-point contact thanks to three micro buttons
  • Tactile switching and tactile surfaces
  • Operating force complies with TSI-PRM and EN 14752
Signaling
  • 6 LED displays
  • LED displays can be controlled in groups
  • Luminous colors: red, green
  • Orientation, confirmation or warning tones (individually parameterized)
  • Orientation tone and confirmation tone as continuous or intermittent tones max. 53 dB(A)
Environmental conditions
Switching cycles > 7 million
Operating temperature -40 … +80 °C
Degree of protection IP67
Electrical data
Nominal voltage 12 … 110 VDC, depending on the version
Nominal current 50 mA @ 24 VDC, 110 mA @ 24 VDC with sound
Switching current Max. 200 mA, depending on the version
Switching function Normally open (NO), PNP or NPN, potential-free variant available

PK52 push button variants at a glance on the basis of construction types

PK52 TSL-ESCHA
  • Function one-sided
  • Application area: wall panel or door profil
  • Screws covered by stainless steel front panel
  • Stainless steel front panel with text printing and/or Braille
PK52 Glaseinbau TSL-ESCHA
  • Function double-sided
  • Application area: glass door
  • Mounting from front side in the back side cover housing
  • Integrated mounting aid
  • Screws covered by stainless steel front panel
  • Stainless steel front panel with text printing and/or Braille
  • The following angles are available for adapting the housing to the door profile slope: 0°/6°/10°/15°/25°
  • Degree of protection IP67 (vehicle exterior)
PK52 Glaseinbau Rollstuhl TSL-ESCHA
  • Function one-sided
  • Application area: glass door
  • Mounting of push button in the back side cover housing
  • Integrated mounting aid
  • Screws covered by stainless steel front panel
  • Stainless steel front panel with text printing and/or Braille
  • The following angles are available for adapting the housing to the door profile slope: 0°/6°/10°/15°/25°
  • Degree of protection IP67 (vehicle exterior)
PK52 CAFD TSL-ESCHA
  • Function one-sided
  • Application area: lavatories
  • Mounting from back side with cover housing/or installation from front side
  • Screws concealed
  • Touch surface raised
  • Pictograph with tactile touch surface
  • EN 14752
  • EN 16683: CFAD = call for aid device
Acoustic signals

Orientation tone

Confirmation tone

A special tool supplied by TSL is required for disassembly of the PK52 push button. This protects the door opening push button against manipulation by unauthorized persons. Watch the video and see how to easily remove the front ring.

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