Non-contact sensor SRF with RFID technology

The smart RFID safety sensor SRF was specially developed for monitoring protective devices. With its innovative diagnostic system, it also makes safety circuits suitable for Industry 4.0. The system can read out a wide range of data, even if several of the SRF electronic sensors are connected in series.

Non-contact safety sensor SRF

The SRF is a non-contact safety sensor for monitoring movable guards such as flaps, doors and protective bonnets. This particularly small RFID sensor protects employees from injury by switching off machines and systems or not even starting them up until the guard is properly closed.

SRF is an acronym meaning "Safety RFID".
  • Cost-saving: thanks to a four-wire unshielded standard connection cable from sensor to sensor
  • Compact: small in size, flexible in use
  • Safe: up to PL e – even in series connection, with high default protection (according to ISO 14119)
  • New innovative Daisychain Diagnostics (DCD)
  • Reading diagnostics information through Android smartphone via NFC interface
  • Transmission of data via IO-Link interface
  • Simple and specific maintenance thanks to pre-failure monitoring
  • Cost reduction by eliminating machine downtimes
  • Connecting the sensor information of six different diagnostic circuits
  • Support of an energy-optimised application: Voltage levels known at any time
Electrical data
  • Rated operational voltage Ue: 24 V
  • Output current of the safety outputs Ie: 100 mA
  • Output current of the message output Ie: 10 mA
Mechanical data
  • Housing: PA66 + PA6, red, self-extinguishing
  • Connection cable: PUR
  • Mounting holes: Ø 4,5 (for M4 screws)
  • Displays: 1 × LED red/green operating status, 1 × LED yellow actuation status
  • Ambient temperature: -25 °C to +70 °C
  • Protection class: IP69
Safety data sheet
  • PL e / Kat. 4 (according to EN ISO 13849-1)
  • SIL CL 3 (according to DIN EN 62061)
  • PFHD = 6 × 10-9 1/h
  • Mission time: 20 years
  • Switching distance:
    • Rated operating distance Sn: 13 mm
    • Assured switching distance – On Sao: 10 mm
    • Assured switching distance – Off Sar: 25 mm
    • Hysteresis: 2 mm
  • Switch-off delay ta: max. 100 ms
  • Ready delay tv: max. 2 s
  • Safe sensors in Cat. 4, PL e or SIL CL 3
  • Safe serial connection of SRF up to PL e, Cat. 4 / SIL CL 3
  • Coded and unique actuator
  • Protection class IP69
  • Local reset button (optional)
  • Compact design
  • Diagnostics system DCD (optional)
  • PNP diagnostics
  • Fault tolerant output (optional)
  • Single and series connection possible
  • Connection via M12 plug
Art. No. Type IGES STEP Assembly instructions Spec sheet
6075687078Actuator SRF-0
6075687144Actuator SRF-0-R18
Art. No. Type IGES STEP Assembly instructions Spec sheet
6075619122Diagnostic module SRF DI-C-0/1-T (DIN rail housing)->
6075619123Diagnostic module SRF DI-C-8/1-T (DIN rail housing), 8 digital outputs
6075619124Diagnostic module SRF DI-C-16/1-T (DIN rail housing), 16 digital outputs
60756191256-fold diagnostic module SRF DI6-C-0/1-T (DIN rail housing)
6075689126Diagnostic module SRF DI-F-0/2-E0,25 (use directly at the machine)
Art. No. Type IGES STEP Spec sheet
6075689084Termination plug M12 AEP-M12/4
6075689085Connecting cable S1W-M12A8/BW-1PU
6075689086Connecting cable S1W-M12A8/BW-2PU
6075689087Connecting cable S1W-M12C4/AW-2PU
6075689088Connecting cable S1W-M12C4/AW-5PU
6075689089Connecting cable S1W-M12C4/AW-10PU
6075689090Connection cable SFW-M12C4/AW-0,5PU
6075689091Connection cable SFW-M12C4/AW-2PU
6075689092Connection cable SFW-M12B5/AW-2PU
6075689093Connection cable SFW-M12B5/AW-5PU
6075689127Fixing clip for T adapter AT-CLIP-M12
6075989082T adapter for series connection ATS-M12/4-M12/8
6075989083T adapter for connection of I/O link and reset button ATD-M12/8-M12/4

RFID safety sensor with intelligent diagnostic function

The diagnostic system of the SRF reads out a multitude of data from each individual sensor, even in series connection, and makes it available centrally and flexibly in the sense of intelligent production. The diagnostic data is read into the machine control system via IO-Link, for example, or alternatively displayed on the smartphone via NFC technology.

For each RFID sensor, 20 different pieces of diagnostic information can be retrieved and made available. The collected data enables effortless and cost-saving predictive maintenance through early fault detection and can thus avoid a potentially costly plant shutdown. This way, your machines and plants work even more efficiently!

SRF sensors in operation on site

The areas of application for RFID safety sensors are diverse. However, they all have one thing in common: they enable quick and easy fault diagnosis.

Safety technology for lifting platforms

„When a worker is standing on the working platform and notices at the top position that the platform cannot be moved, a time-consuming troubleshooting began up to now. Thanks to the SMART Safety System, the data can now be read out via NFC interface. This immediately tells you which sensor is reporting a problem, the corresponding railing can be checked without detours and quickly closed again correctly.“


With BERNSTEIN against the pandemic

„There are 16 SRF safety sensors per machine, which ensure that the production of respirators runs smoothly. The SRF monitors movable guards, such as flaps, doors or protective grids. This particularly small sensor protects employees from injury by switching off machines and systems or not even putting them into operation until the separating protective device is properly closed.“


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