1. Product Functions and Core Features

Efficient Surge Protection Capability

• Protection Level: Single-channel surge current up to 10kA (8/20μs waveform), capable of withstanding multiple lightning strikes, meeting the EN 61643-21 standard.
• Residual Voltage Control: Line-to-line residual voltage ≤100V, line-to-ground residual voltage ≤50V, ensuring signal integrity and preventing equipment damage caused by overvoltage.
• Automatic Reset: Adopts a hybrid architecture of Gas Discharge Tube (GDT) and Transient Voltage Suppressor (TVS), enabling recovery without manual intervention after surge impact.

Modular Design and Compatibility

• Plug-in Installation: Directly inserted into the field-side slot of KF series safety barriers, no additional wiring required, saving cabinet space.
• Multi-signal Compatibility: Supports analog signals (e.g., 4-20mA, ±50mV) and digital signal inputs, compatible with thermocouples, RTDs, pressure transmitters, and other devices.
• Protected Wire Number Correspondence: The digital markings on the module correspond one-to-one with the protected terminals of the KF module (e.g., wires 1, 3, 4, 6), avoiding wiring errors.

Intrinsic Safety and Explosion-proof Certification

• Explosion-proof Rating: Complies with Ex ia IIC T6 explosion-proof certification, suitable for gas explosion-proof Zone 0/1/2 and dust explosion-proof Zone 20/21/22.
• Energy Limitation: Limits the energy in hazardous areas within a safe range through electrical isolation (short-circuit current ≤250mA, open-circuit voltage ≤30V), meeting intrinsic safety requirements.

Intelligent Diagnosis and Reliability

• Status Monitoring: Integrates LED indicators (green: normal; red: surge triggered) to display real-time working status.
• Anti-interference Capability: Complies with the NAMUR NE21 standard, featuring strong electromagnetic interference (EMI) resistance, suitable for complex industrial environments.

2. Technical Parameters and Performance Indicators

3. Installation and Maintenance

Structural Design

• DIN Rail Mounting: Supports 35mm standard rails; compact size (approximately 20×119×115mm) and weighs about 150g, saving cabinet space.
• Terminal Layout: Terminals on the field side and system side are marked with different colors; power terminals support redundant power supply.

Wiring Specifications

• Intrinsically Safe Cable Requirements: Shielded twisted-pair cables must be used, laid separately from non-intrinsically safe cables, with a spacing of ≥50mm.
• Grounding Requirements: Grounding resistance ≤1Ω to ensure effective discharge of surge current.

Commissioning and Diagnosis

• Parameter Configuration: The signal type, range, and alarm value can be set via the PW2-ADP1-USB configuration software.
• Troubleshooting: If the LED alarms, check the on-site wiring connections or read the diagnostic code (e.g., 0x8001 indicates an open circuit) using a HART handheld communicator.

4. Typical Application Scenarios

Chemical and Petrochemical Industry

• Protect the thermocouple signal loop of reaction kettles to prevent signal distortion or equipment damage caused by lightning strikes.
• Isolate the weak voltage signals of vibration sensors to support high-precision condition monitoring in explosive environments.

Power and Energy Sector

• In gas turbine control systems, protect the mV signals of temperature sensors from operational overvoltage.
• Monitor the vibration of wind turbine gearboxes, and provide early warning of equipment abnormalities through surge protection.

Pharmaceutical and Food Processing

• Protect the low-level signals of pressure transmitters in cleanroom environments, supporting hygienic installation and meeting GMP compliance requirements.

5. Selection and Ordering Information

Model Meaning

• P-LB: Plug-in surge protector; 2: Dual-channel; A: Standard configuration; 1346: Version number or specific configuration code.

Accessories and Expansion

• Cold-Junction Compensator: It is recommended to match with the K-CJC module to compensate for the impact of ambient temperature changes on thermocouple measurements.
• Redundant Design: Can be used in parallel with P-LB series surge protectors to achieve dual protection.

6. Suppliers and Technical Support

• Manufacturer: Pepperl+Fuchs (Germany), providing global technical support and certification document downloads (product manuals, wiring diagrams available on the official website).
• Chinese Suppliers: Pepperl+Fuchs Shanghai, Xiamen KuanTu Automation, etc., providing spot sales and on-site technical services.
• Compliance Documents: Must comply with ATEX/IECEx installation specifications; grounding and power distribution must meet the EN 60079-14 standard.

7. Precautions

Wiring Safety

• Do not plug or unplug the module when energized to avoid electric shock risks.
• Intrinsically safe cables and non-intrinsically safe cables must be strictly isolated to avoid safety hazards caused by mixed connections.

Compatibility Verification

• When matching with PLC/DCS modules, confirm the input impedance matching (e.g., module input impedance ≥10kΩ) to avoid signal attenuation.
• For intelligent transmitter applications, ensure the signal bandwidth (0.3-7.5kHz) is within the range supported by the module to prevent communication failure.

Regular Maintenance

• It is recommended to check the grounding resistance and surge counter once every 12 months to ensure the normal operation of the protection function.
• If the module frequently triggers surge protection, investigate whether there is a continuous overvoltage source on-site (e.g., equipment failure).