Pepperl+Fuchs KHA6-SH-Ex1 Switch Amplifier

Pepperl+Fuchs KHA6-SH-Ex1 — Switch Amplifier

A 1-channel intrinsically safe isolated barrier from the Pepperl+Fuchs K-System family, used to transfer digital signals from SN/S1N NAMUR proximity sensors or approved dry contacts in hazardous areas to the safe area, while providing galvanic isolation and line fault monitoring.

Key Technical Specifications

表格

Advantages & Features

• High functional safety — certified up to SIL 3 / PL d, suitable for demanding safety-critical loops.
• Universal AC supply — 85–253 V AC wide-range input, no separate 24 V DC supply needed.
• Flexible sensor interface — accepts both NAMUR (SN/S1N) proximity sensors and potential-free dry contacts.
• Three independent outputs — two relay signal outputs (Output I must be used for SIL 3 single-channel safety) plus a dedicated transistor fault indicator.
• Built-in line fault detection (LFD) — continuously monitors lead breakage (LB) and short circuit (SC) on the field circuit.
• Galvanic isolation — safe separation up to 375 V peak between field, control, and supply sides.
• Intrinsic safety — approved for connection to IIC circuits in hazardous Zone 0/1/2.
• LED status indication and compact DIN-rail housing type E for easy panel mounting.

Typical Applications

• Process automation in oil & gas, chemical, petrochemical, and pharmaceutical plants
• Hazardous-area signal transmission (Zone 0/1/2, gas groups IIC)
• Interfacing NAMUR proximity sensors and mechanical safety contacts to PLC/DCS/safety systems
• Emergency shutdown (ESD), burner management, and gas/dust detection loops
• Machinery safety circuits meeting EN/ISO 13849 PL d
• Refineries, offshore platforms, tank farms, and industrial furnace equipment

Notes / Considerations

• Output I (terminals 13/14) must be used to achieve single-channel SIL 3 safety; Output II alone is not sufficient for that rating.
• When connecting mechanical dry contacts, fit a 10 kΩ resistor across the contact and a 1.5 kΩ resistor in series for proper LFD detection.
• Maximum safe voltage Um = 253 V AC/DC is not the rated operating voltage — observe the actual supply range.
• Field cable capacitance and inductance must be kept within Ex ia limits for IIC circuits.
• Lead resistance on the field side must not exceed 50 Ω.
• Observe the ATEX certificate (PTB 00 ATEX 2043), instruction manual, and control drawings during installation and commissioning.
• The device is IP20 — install inside a closed control cabinet; do not expose to conductive dust or moisture.