FS-LB-I Field Mount Surge Protector Pepperl+Fuchs Stainless

Global PLC Spare HUB's Insight

• The FS-LB-I is a specialized field-mount surge protector for hardening sensitive instrumentation.
• It screws directly into process transmitter conduit entries, protecting equipment at the point of impact.
• Constructed from polished 316L stainless steel, it is ideal for corrosive chemical and offshore environments.
• For Intrinsically Safe (Ex ia) loops, it acts as a critical line of defense against atmospheric transients.
• Engineering teams prioritize the FS-LB-I to prevent high-energy surges from reaching the DCS or PLC backplane.

Functional Summary: Transient Suppression

• The FS-LB-I limits induced signal line voltages to safe levels during lightning or switching events.
• It diverts transient currents up to 10 kA safely to ground through a robust internal discharge path.
• The unit provides a 500V line-to-ground isolation barrier for instruments with low dielectric strength.
• Its field-mountable design eliminates the need for additional surge cabinets in remote areas.
• Designed for high-availability loops where transmitter uptime is non-negotiable.

Technical Performance Matrix

• Brand: Pepperl+Fuchs (P+F)
• Model Number: FS-LB-I
• Housing Material: Stainless steel 1.4401 (AISI 316) all-over polished.
• Mounting Interface: M20 x 1.5 Metric thread.
• Discharge Current: 10 kA (Line-to-Ground) / 5 kA (Line-to-Line).
• Clamping Voltages: 85 V (Symmetrical) / 500 V (Asymmetric).
• Response Time: Ultra-fast 1 ns (Symmetrical) for high-speed protection.
• Environmental Rating: IP67 Waterproof; -30 °C to 60 °C operating range.
• Ex Protection: ATEX II 2G EEx ia IIC T6 certified for hazardous zones.
• Bandwidth: ≥ 40 kHz, supporting digital and analog signal transmission.

Equipment Integration & Applications

• Process Transmitters: Fits most transmitters from brands like Rosemount and ABB.
• Hazardous Areas: Certified for use in potentially explosive gas atmospheres.
• Offshore Platforms: Resists salt-spray and harsh maritime conditions.
• DCS Protection: Blocks field-side electrical interference from traveling to Honeywell or Siemens systems.
• Lightning Protection: Essential for storage tanks, pipelines, and remote pumping stations.
• Fieldbus Networks: Suitable for low-speed communication loops without signal degradation.

Diagnostic & Physical Integrity

• High-Speed Clamping: Limits transients in 1ns to prevent semiconductor puncture.
• Grounding Requirements: Must be connected to a solid, effective equipotential ground for operation.
• Zero Signal Interference: Leakage current ≤ 5 µA ensures no impact on 4-20mA loop accuracy.
• Corrosion Resistance: Polished 316 Stainless Steel ensures the housing remains intact for years.
• Vibration Resistance: Field-mount design is more durable than DIN-rail modules in high-vibration plants.

Logistics, Warranty, and Support

• Warranty Policy: 12-month comprehensive professional technical warranty included.
• Dispatch Window: Orders processed and shipped globally within 24 to 48 hours.
• Express Delivery: Secured transit available via FedEx, UPS, or DHL.
• Compliance: Meets IEC 60529 and Directive 94/9/EC (ATEX) standards.

Professional FAQ & Selection Guide

• Does the FS-LB-I require regular testing?
• It is passive and maintenance-free, but we recommend verifying the ground connection during annual shutdowns.
• What happens if the discharge current exceeds 10 kA?
• The unit is built to withstand 10 kA; extreme surges above this may destroy the device to protect the transmitter.
• Can I use this on a non-Intrinsically Safe (Ex d) transmitter?
• While specifically rated for Ex ia, it can be used in non-hazardous areas, but ensure the thread type (M20) matches.
• Does the 0.4m cable length affect the response time?
• No, but it is critical to keep the ground lead as short and straight as possible to minimize inductance.
• Is the stainless steel housing conductive for grounding?
• Yes, the housing is part of the grounding path, but the dedicated cable lead ensures a verified equipotential link.

Tags