BNS 260-11Z-L - Non-Contact Magnetic Redundant Switch - SS IP67 SIL2 Industrial Safety

1. ​Product Overview​

The Schmersal BNS 260-11Z-L is an industrial-grade safety switch engineered for large-access guarding applications requiring extended non-contact sensing. Featuring a ​260mm magnetic sensing range, this device utilizes ​encrypted coded actuator technology​ to prevent defeat attempts while monitoring guard positions. Its ​stainless steel housing (IP69K rated)​​ withstands extreme temperatures (-30°C to +85°C), high-pressure washdowns (100 bar @ 80°C), and corrosive chemicals (pH 0-14). Certified to ​ISO 13849-1 PL e (Category 4)​​ and ​IEC 62061 SIL 3, the "L" suffix denotes ​integrated multi-color LED diagnostics. The extended range accommodates structural flex in heavy machinery access points while maintaining ±5mm lateral tolerance. Hermetically sealed electronics ensure reliability in food processing, pharmaceutical, and offshore applications.

2. ​Key Technical Parameters​

• ​Safety Ratings:
  • PL e (ISO 13849-1 Cat. 4, DCavg=99.8%)
  • SIL 3 (IEC 62061, PFHD: 1.1×10⁻⁹/h)
• ​Electrical Specifications:
  • Voltage: 24V DC ±10% (19.2-28.8V)
  • Contacts: 2 NC force-guided (8A @ 250V AC)
  • Power Consumption: ≤3W
• ​Sensing Performance:
  • Switching Distance: 260mm ±10mm
  • Lateral Tolerance: ±5mm
• ​Environmental:
  • IP69K (IEC 60529)
  • Chemical Resistance: Resists hydrocarbons/alkalis
• ​Materials:
  • Housing: Electropolished SS316L (Ra ≤0.4μm)
  • Actuator: Ferrite array with RFID encryption
• ​LED Indicators:
  • Green: Guard secured
  • Yellow: Pre-fault warning
  • Red: Critical fault
• ​Certifications:
  • ATEX/IECEx Zone 21
  • 3-A Sanitary Standard 08-19

3. ​Primary Applications​

This switch excels in large-scale industrial safety scenarios:

• ​Bulk Material Handling: Oversized conveyor access hatches in mining
• ​Food Processing: CIP washdown zones on industrial ovens
• ​Automotive Assembly: Robotic welding cell service gates
• ​Chemical Reactors: Maintenance hatches with acid vapor resistance
• ​Pharmaceutical Isolators: GMP-compliant cleanroom access
• ​Wastewater Treatment: Sludge tank covers with H₂S resistance
• ​Aerospace Manufacturing: Composite curing oven entries
• ​Marine Engineering: Engine room doors on offshore platforms
  Its 260mm sensing range accommodates thermal expansion in steel mills and vibration-induced movement in heavy crushers, while IP69K-rated construction withstands daily high-temperature sanitation cycles.

4. ​Functional Advantages​

• ​Extended Range Reliability:
  • 260mm detection eliminates alignment challenges
  • Compensates for 20mm structural deflection
• ​Cyber-Physical Security:
  • 128-bit RFID encrypted actuator pairing
  • Tamper-evident Torx T15 security screws
• ​Predictive Diagnostics:
  • Yellow LED: >3mm misalignment/thermal drift
  • Red LED: Contact welding/power fault
• ​Hygienic Construction:
  • Crevice-free SS316L (EHEDG EL-A1 compliant)
  • Self-draining surfaces (0° fluid retention)
• ​Safety Redundancy:
  • Dual ARM Cortex-M7 processors
  • Cross-monitored force-guided contacts
• ​Maintenance Optimization:

  5 million operations
  Hot-swappable actuator modules

5. ​Safety Operation & Architecture​

​Three-Stage Safety Sequence:

1. ​Authentication:
   • Encrypted RFID handshake validates actuator
   • NC contacts close within 100ms
2. ​Continuous Monitoring:
   • Hall sensors track position (±0.5mm)
   • Current sensors detect contact anomalies
3. ​Fault Response:
   • Stage 1: >3mm displacement → Yellow LED + warning
   • Stage 2: >5mm displacement → Safety shutdown
4. ​Reset Protocol:
   • Physical guard reclosure required
   • 200ms self-test validates contact separation

​SIL 3 Implementation:

• ​Dual-Channel Redundancy:
  • Processor cross-verification every 5ms
  • Safe-state output on discrepancy
• ​Failure Mode Coverage:
  • Contact welding forces mechanical separation
  • Undervoltage lockout below 18V DC
• ​Diagnostic Hierarchy:

  ​Condition​	​LED​	​Output State​
  Normal operation	Green ON	NC closed
  Guard open	OFF	NC open
  Misalignment >3mm	Yellow FLASHING	NC open
  Contact fault	Red ON	NC forced open

   

   

   

   

   

   

  Parameter	Specification
  Product Type	Safety Interlock Switch with Mechanical Guard Locking & LED Status Indication
  Model Number	BNS 260-11Z-L
  Safety Category (EN ISO 13849-1)	PLd, Category 3
  SIL Rating (EN IEC 62061)	SIL 2
  Actuation Principle	Tongue Actuator (Requires AZM 260 series actuator)
  Contact Configuration	1 N/O (Normally Open - Safety) + 1 N/C (Normally Closed - Monitoring)
  Contact Mechanism	Positive-Opening (EN 60947-5-1 Annex K)
  Contact Material	Silver Alloy (AgSnO₂)
  Rated Voltage (Ue)	24V DC / 230V AC
  Max. Switching Current	10 A (AC-15, 250V AC); 8 A (DC-13, 24V DC)
  Utilization Category	AC-15 (230V AC), DC-13 (24V DC)
  Locking Mechanism	Spring-Loaded Mechanical Locking
  Locking Force	≥ 400 N
  Release Force	≤ 50 N (manual release at actuator)
  Housing Material	Zinc Die-Cast (Epoxy Coated, Grey RAL 7035)
  Protection Rating	IP67 (NEMA 4/4X/13)
  Electrical Connection	Screw Terminals (3-pin: 1-2 N/O, 3-4 N/C) + LED wiring
  Terminal Capacity	0.5–1.5 mm² (solid) / 0.5–1.0 mm² (stranded)
  Cable Gland Entry	M16 × 1.5
  Operating Temperature	-25°C to +70°C
  Mechanical Life	> 1,000,000 cycles
  Electrical Life	> 100,000 cycles (AC-15, 230V, 3A)
  Safety Standards	EN ISO 14119, EN 60947-5-1
  Approvals	CE, cULus, CCC, UKCA
  Status Indication	Integrated Multi-Color LED: • Green: Guard locked/safe • Red: Fault/error
  Actuator Compatibility	AZM 260 Series (e.g., AZM 260-11Z)
  Actuator Engagement Depth	≥ 3 mm
  Locking Detection	Position monitoring via N/C contact
  LED Supply Voltage	24V DC (±15%)

   

   

   

   

   

   

 Packaging & Shipping

Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.

With many years of experience in the industrial sector, we consistently deliver the highest quality of spare parts.which make sure that all this jobs are

perfectly.

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