Component Snapshot At-a-Glance
- Model: KL4201X1-BA1
- Alt. P/N: 12P2506X042 (Emerson)
- Product Series: DeltaV KL Series (CHARM Baseplates)
- Hardware Type: Intrinsically Safe (I.S.) CHARM Baseplate
- Key Feature: ATEX/IECEx/FM/UKEX certified, 8-channel capacity, DIN rail mount
- Primary Field Use: Carries DeltaV IS-CHARM I/O modules in Class I/Div.1 hazardous zones
Hard-Numbers: Technical Specifications
- Backplane Power: 6.3VDC @ 4A (bus)
- Field Power: 24VDC @ 10A (field circuits)
- Channel Capacity: 8 IS-CHARM modules (any mix AI/AO/DI/DO)
- Isolation Rating: Intrinsically Safe (I.S.) – 250VAC rms isolation
- Certifications: ATEX, IECEx, FM, UKEX (Class I/Div.1, Zone 0/1)
- Operating Temp: -20°C to +50°C
- Humidity: 5–95% non-condensing
- Mounting: 35mm DIN rail (EN 60715)
- Dimensions (W×H×D): 159×178×130mm
- Weight: 0.5kg (approx)
- Hot-Swap: No – power down before replacement
The Real-World Problem It Solves
Hazardous areas (refineries, gas plants) need I/O without explosion risk; standard baseplates lack I.S. certification. Running separate barriers adds cost, cabinet space, and wiring complexity.
Where you’ll typically find it:
- Oil & gas offshore platforms (Zone 0/1 wellhead control panels)
- Refinery process units (Class I/Div.1 reactor/flare monitoring)
- Chemical plants (ATEX Zone 1 solvent storage I/O racks)
It merges I.S. barrier functionality and CHARM carrier into one DIN rail unit, cutting panel space and wiring while maintaining explosion protection.
Hardware Architecture & Under-the-Hood Logic
This is a passive, maintenance-free baseplate with integrated I.S. protection; no onboard CPU—routes power and signals between DeltaV controller and IS-CHARMs.
- DeltaV backplane feeds 6.3VDC bus power to baseplate.
- 24VDC field power connects to baseplate terminals (fused, 10A max).
- Intrinsically Safe circuitry limits voltage/current to IS-CHARMs (prevents sparking).
- 8 slots route isolated field signals (AI/AO/DI/DO) to each CHARM.
- DIN rail-mounted locking clips secure baseplate; no tools needed for installation.
- LED indicators show bus/field power status; no calibration required.
Field Service Pitfalls: What Rookies Get Wrong
Mixing Standard & IS-CHARMs on Same Baseplate
Techs install non-IS CHARMs (e.g., KL3000 series) on . Violates I.S. certification; creates explosion hazard.
- Field Rule: Only use Emerson IS-CHARMs (e.g., KL4101, KL4202) on this baseplate.
Overloading Field Power Circuit
Users connect >10A of 24VDC field devices. Blows internal fuse; causes loss of I/O in hazardous area.
- Quick Fix: Calculate total field current per baseplate; keep <10A; use external relays for high-current loads.
Incorrect DIN Rail Grounding
Mount on ungrounded DIN rail or skip protective earth (PE) connection. EMI noise disrupts signals; I.S. safety compromised.
- Field Rule: Use clean, dedicated PE ground (≤4Ω); torque ground screw to 1.2–1.5Nm.
Commercial Availability & Pricing Note
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.
