Eaton 8937-HN2

Product Name: Eaton MTL 8937-HN Intrinsic Safety Digital Input Isolator / Fiber Optic Repeater

Product Introduction: The MTL 8937-HN is an intrinsic safety barrier or fiber optic repeater module designed to interface field sensors (NAMUR/dry contacts) in hazardous areas to safe-area control systems, providing galvanic isolation and signal integrity.

Category: Others

Description

Technical Specifications:

Input Type: Dry contact, NAMUR (NE40 compatible), proximity switches
Output: Relay contact (Form C, SPDT) or fiber-optic RS-485
Isolation Voltage: 250 V AC (channel-to-channel & ch-ground) or ≥1500 V AC (fiber version)
Supply: Passive (loop-powered) or 18–30 V DC / 85–265 V AC (active/fiber version)
Response Time: <10 ms
Operating Temperature: -20°C to +60°C (some versions -40°C to +70°C)
Safety Certification: SIL 2 (IEC 61508), ATEX, IECEx, FM, CSA
Module Width: 12.5 mm (DIN type)
Transmission Distance: Up to 2–4 km multimode / 20–40 km single-mode (fiber version)

Functional Features: Line fault detection (short/open wire), NAMUR threshold logic, Modbus/PROFIBUS support (fiber version), LED diagnostics.

Performance Parameters: MTBF >1,000,000 hours; data rate up to 12 Mbps; channel scan/update optimized for SIS loops.

Material Composition: Polyamide/UL94-V0 housing (DIN) or metal enclosure (repeater); encapsulated passive components.

Structural Features: 35 mm DIN rail snap-fit; terminal block connections; ST/SC/FC fiber ports (repeater variant).

Working Principle: Passive version limits energy to hazardous area via zener/diode network; active/fiber version converts electrical RS-485 to optical signals using galvanically isolated transceivers to eliminate ground loops and EMI.

Advantage Highlights: No software/microprocessor in passive version (deterministic safety); native NAMUR diagnostics; fiber immunity to EMI/lightning; compact 12.5 mm width saves cabinet space.

Applicable Industries: Oil & gas, chemical plants, pharmaceuticals, mining (Zone 2/Div 2), long-distance industrial networking.

Model Series: MTL 8900 Series IS Barriers / Network Extenders

Installation Requirements: Snap onto 35 mm DIN rail inside rated enclosure; ensure correct terminal wiring (field vs safe side); ground barrier earth terminal; use proper fiber termination if applicable.

Usage Precautions: Verify SIL rating matches loop requirement; do not mix intrinsically safe and non-IS wiring in same duct without segregation; check NAMUR sensor compliance; avoid electrostatic discharge on passive components.

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