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BNS 250-11ZG - Non-Contact Magnetic + Mechanical Interlock - SS IP67 SIL2 Safety Switch
| MOQ: | 1 |
| Price: | USD 100-10000/Piece |
| Standard Packaging: | 50*50*50mm |
| Delivery Period: | 3-7 |
| Payment Method: | T/T |
| Supply Capacity: | 1/piece in stock |
1. Product Overview
The Schmersal BNS 250-11ZG is an advanced long-range safety switch engineered for industrial access control in demanding environments requiring hygienic design. Featuring an exceptional 250mm sensing distance, this non-contact device utilizes coded magnetic technology to monitor guard positions without mechanical wear. Its stainless steel housing (IP69K rated) withstands extreme temperatures (-30°C to +85°C), high-pressure washdowns (100 bar), and corrosive chemicals (pH 1-14). Certified to ISO 13849-1 PL e (Category 4) and IEC 62061 SIL 3, the "11ZG" suffix indicates dual-channel diagnostics with integrated green status LED. The extended sensing range accommodates structural flex in large access points while maintaining ±5mm lateral tolerance for installation variances, making it ideal for food processing, pharmaceutical, and heavy machinery applications.
2. Key Technical Parameters
- Safety Ratings:
- PL e (ISO 13849-1 Cat. 4, DCavg=99.7%)
- SIL 3 (IEC 62061, PFHD: 1.4×10⁻⁹/h)
- Electrical Specifications:
- Voltage: 24V DC ±10% (19.2-28.8V)
- Contacts: 2 NC + 2 NO (force-guided, 6A @ 250V AC)
- Power Consumption: ≤2.5W
- Sensing Performance:
- Switching Distance: 250mm ±10mm
- Lateral Tolerance: ±5mm
- Environmental:
- IP69K (IEC 60529)
- Chemical Resistance: Resists acids, alkalis, solvents
- Materials:
- Housing: Electropolished SS316L (Ra ≤0.8μm)
- Actuator: Encrypted ferrite magnet array
- LED Indicator:
- High-intensity green LED (2,500mcd)
- Certifications:
- EHEDG EL-A1, 3-A 08-19
- ATEX Zone 21/22
3. Primary Applications
This switch excels in large-scale hygienic environments:
- Food Processing: CIP washdown zones on bulk ingredient handling conveyors
- Pharmaceutical: Cleanroom isolator hatches requiring FDA 21 CFR compliance
- Beverage Production: Canning/bottling line guard doors with daily sanitation
- Chemical Processing: Reactor access doors with acid vapor resistance
- Automotive Paint Shops: Oversized robotic cell access gates
- Waste Recycling: Shredder enclosure monitoring with debris resistance
- Aerospace Manufacturing: Composite curing oven access points
- Marine Engineering: Saltwater-resistant safety doors on offshore platforms
Its 250mm sensing range accommodates thermal expansion in industrial ovens and vibration-induced movement in heavy machinery, while the crevice-free design meets EHEDG standards for hygienic zones.
4. Functional Advantages
- Extended Range Reliability:
- 250mm detection eliminates alignment challenges for large doors
- Compensates for structural warpage up to 15mm
- Hygienic Construction:
- Electropolished SS316L (FDA 21 CFR 177.2600)
- Drainage-optimized geometry (0° fluid retention)
- Tamper Resistance:
- 128-bit encrypted magnetic coding
- Torque-monitored security screws (5Nm)
- Diagnostic Intelligence:
- Green LED confirms guard closure status
- Auxiliary contact for PLC-based fault monitoring
- Safety Redundancy:
- Dual-processor cross-monitoring architecture
- Force-guided contacts guarantee ≥0.5mm separation
- Maintenance Optimization:
5 million non-contact operations
Tool-free actuator replacement - Global Compliance:
- Pre-validated SIL 3 templates
- IECEx Ex tc IIIC T85°C Dc certification
5. Safety Operation & Integration
Magnetic Interlock Sequence:
- Guard Closure:
- Actuator aligns within 250mm → reed contacts close
- Green LED illuminates within 100ms
- Continuous Monitoring:
- Hall sensors track position (±1mm accuracy)
- Current sensors detect contact anomalies
- Fault Response:
-
3mm displacement triggers contact opening
- LED extinguishes during critical faults
-
- Reset Protocol:
- Physical guard reclosure required
- Automatic self-test validates contact separation
SIL 3 Safety Architecture:
- Dual-Channel Processing:
• ARM Cortex-M4 cores with cross-verification
• 10ms watchdog timer - Failure Mode Coverage:
• Contact welding detection via auxiliary circuit
• Undervoltage lockout below 18V DC - Hygienic Integration:
• M12 connectors (P-coded) with PUR cables
• Steam-resistant Viton® seals
Diagnostic Hierarchy:
| Condition | LED Status | Safety Output |
|---|---|---|
| Normal operation | Green ON | NC closed |
| Guard open | OFF | NC open |
| Misalignment >3mm | OFF | NC open |
| Contact welding | OFF | NC forced open |
| Power loss | OFF | NC open |
| Parameter | Specification |
|---|---|
| Product Type | Safety Interlock Switch with Dual-Channel Monitoring (Non-Locking) |
| Model Number | BNS 250-11ZG |
| Safety Category (EN ISO 13849-1) | PLe, Category 4 (when dual-channel wired) |
| SIL Rating (EN IEC 62061) | SIL 3 |
| Actuation Principle | Tongue Actuator (Requires separate actuator e.g., AZM 250-11ZG) |
| Contact Configuration | 2 N/O (Normally Open - Safety) + 2 N/C (Normally Closed - Monitoring) |
| Contact Mechanism | Positive-Opening (Forced disconnection per EN 60947-5-1 Annex K) |
| Contact Material | Silver Alloy (AgCdO) - Anti-welding design |
| 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) |
| Housing Material | Zinc Die-Cast (Epoxy Coated, Grey RAL 7035) |
| Protection Rating | IP67 (NEMA 4/4X/13) |
| Electrical Connection | Screw Terminals (6-pin: 13-14/23-24 N/O, 31-32/41-42 N/C) |
| Terminal Capacity | 0.5–1.5 mm² (solid) / 0.5–1.0 mm² (stranded) |
| Cable Gland Entry | M16 × 1.5 (2 entries) |
| Operating Temperature | -25°C to +70°C |
| Mechanical Life | > 1,500,000 cycles |
| Electrical Life | > 200,000 cycles (AC-15, 230V, 3A) |
| Safety Standards | EN 60947-5-1, EN ISO 14119 |
| Approvals | CE, cULus, CCC, EAC, UKCA |
| Actuator Compatibility | AZM 250-ZG Series (e.g., AZM 250-11ZG) |
| Actuator Engagement Depth | ≥3 mm |
| Contact Force | ≥5 N (guaranteed positive opening) |
| Misalignment Tolerance | ±1 mm (axial/lateral) |
| Shock Resistance | 30 g (11 ms duration) |
| Vibration Resistance | 10–55 Hz, amplitude 0.75 mm |
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.
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