PEPPERL+FUCHS KFD2‑ER‑EX1.W.LB
Product Overview
The Pepperl+Fuchs KFD2‑ER‑EX1.W.LB is a single‑channel conductive switch amplifier belonging to the K‑System intrinsic‑safety isolated barrier familyPepperl+Fu…. It supplies AC measuring voltage for conductive level electrodes installed within hazardous classified zones, converting liquid‑level conductivity signals into relay contact outputs for min/max tank‑level monitoring and on‑off control. Equipped with line‑fault detection (LFD) for field electrode wiring breakage, adjustable response sensitivity and configurable time‑delay function, this DIN‑rail barrier provides full galvanic isolation between hazardous‑area field side and safe‑side control system. It is widely applied in petrochemical, chemical and oil‑gas facilities for tank‑farm level measurement, and serves as critical spare‑part hardware for retrofit and direct replacement of existing K‑System installed‑base racks.
2. Product Core Brief (Snapshot Format)
- Model: KFD2‑ER‑EX1.W.LB
- Brand: Pepperl+Fuchs
- Series: K‑System Intrinsic‑Safety Barrier
- Core Function: Conductive level switch amplifier, processes conductive electrode signals from hazardous areas, delivers relay switching outputs for tank min/max level control, supports line‑fault detection and adjustable time‑delay.
- Category: Conductive Switch Amplifier / Isolated Safety Barrier
- Key Specs: 1‑channel, 20‑30 VDC power supply, sensitivity 1 kΩ‑150 kΩ adjustable, max 10 s time‑delay, dual relay outputs (signal + fault), line‑fault detection, galvanic reinforced isolation, 20 mm width DIN‑rail form factorPepperl+Fu…
- Condition: New Original (New Surplus)
Key Technical Specifications
- Power Supply: 20‑30 VDC, 30‑40 mA rated current; powered via Power Rail or terminal terminals 14+,15‑Pepperl+Fu…
- Field Input: Conductive level electrode input, terminals 1(mass),2(min),3(max); sensitivity adjustable 1 kΩ ~ 150 kΩ via potentiometer; supports min/max control or simple on/off control modesPepperl+Fu…
- Output: Two independent Form‑C relay contact outputs; main signal relay, separate fault‑relay for line‑fault detection feedback; max switching power 192 W, 2000 VAPepperl+Fu…
- Time‑Delay: Adjustable 0.5 s up to 10 s, suppresses false switching caused by liquid splashing and transient conductivity fluctuations
- Diagnostics: Built‑in Line Fault Detection(LFD), detects field‑side electrode wire breakage, indicated via front‑panel red LED; fault relay activates upon wiring failurePepperl+Fu…
- Isolation: Reinforced galvanic isolation, rated insulation voltage 300 Vₑff between field‑side, control‑side and power supply circuits per IEC 61010‑1Pepperl+Fu…
- Hazardous‑Area Compatibility: For connection to intrinsically‑safe conductive electrodes in Zone 0,1,2 hazardous locations
- Mounting: NS35 DIN‑rail mounting, module width 20 mm
- Protection Class: IP20, cabinet‑only installation
- Operating Temperature: ‑20 °C ~ +60 °C cabinet ambient
- Certifications: CE, ATEX, IECEx, NE 21 EMC compliance
- Weight: Approx. 0.22 kg
Typical Application Scope
‑ Petrochemical tank‑farm conductive‑electrode liquid‑level monitoring for high‑low level alarm and pump interlock ‑ Chemical‑plant reactor and storage‑tank min/max level protection within hazardous classified areas ‑ Oil‑gas processing facilities utilizing conductive level probe instrumentation ‑ Retrofit and spare‑part replacement for existing K‑System KFD2‑ER‑EX1.W.LB installations ‑ Safety‑related level interlock loops requiring field‑wire breakage diagnostic capability
Maintenance & Inventory Manager Practical Notes
- Common field failure modes: Relay‑contact degradation from frequent switching loads, Power‑rail spring‑contact oxidation under high‑humidity cabinet environments, surge transients coupled back from field‑side electrode cables.
- Compatibility note: Designed exclusively for conductive level electrode probes; cannot be used for standard NAMUR sensor inputs. Power‑rail bus is the preferred power‑feeding method; verify rail integrity before commissioning.
- Pre‑shipment test checklist: Inspect relay contact integrity, verify potentiometer sensitivity adjustment range, validate 0.5‑10 s time‑delay function, simulate field‑wire break to trigger LFD fault‑relay and LED alarm, run multi‑hour thermal burn‑in test.
- Spare‑parts stocking strategy: K‑System barriers remain widely deployed across process industries. Original factory lead‑times can extend for certain batches. Sites with critical tank‑level safety interlocks should hold spare units to reduce unplanned process‑trip risk.
Critical Installation Pitfalls
‑ Strictly follow ESD anti‑static handling procedures; static discharge can damage internal measuring circuits without visible failure symptoms. ‑ Properly set sensitivity potentiometer matching actual electrode‑medium conductivity; incorrect adjustment will trigger intermittent false level switching. ‑ LFD line‑fault function must be enabled or disabled matching field wiring configuration; mis‑configuration will produce spurious fault alarms. ‑ All field wiring routed into hazardous zones m
