Description
Eaton MTL4541AS
Technical Specifications
- Product type: Isolated intrinsic safety barrier
- Signal type: 4-20mA two-wire transmitter loop
- Supply side: 20V to 35V DC from safe side
- Loop current: 4mA to 20mA
- Isolation voltage: 2.5kV AC isolation between safe and hazardous side
- Accuracy: ±0.1% FS
- Temperature operating range: -40 °C to +60 °C
- Storage temperature: -40 °C to +85 °C
- Humidity: 5% to 95%, non-condensing
- Protection: IP20
- Mounting: DIN rail
- Certification: ATEX, IECEx intrinsic safety certification
Functional Features
- Galvanic isolation between safe area and hazardous area
- Power supply for two-wire 4-20mA field transmitters
- Bidirectional transmission of analog measurement signal
- Intrinsic safety energy limiting circuit
- Low power consumption
- High isolation voltage protection
- DIN rail modular mounting
- Fault diagnostic function for loop wire break
- ATEX and IECEx certified for zone 0, zone 1 hazardous area
- High noise rejection capability
Application Scenarios
- Petrochemical plant pressure transmitter loop
- Refinery temperature measurement intrinsically safe circuit
- Offshore oil platform field instrument signal isolation
- Chemical reactor analog signal transmission
- Gas plant flow transmitter safety barrier
Materials and Construction
- Housing: Flame retardant plastic
- PCB: FR4 board with conformal coating
- Terminals: Screw copper terminals
- Isolation component: High voltage isolation transformer
- Protection component: Zener diode and current limiting resistor
- LED: Power and fault indicator
Structural Features
- Slim modular DIN rail package
- Front panel LED indicators
- Left side hazardous area terminals, right side safe area terminals
- Internal isolation partition between two sides
- Rear DIN rail snap clip
- Compact stacked installation structure
Working Principle The barrier limits energy transferred to hazardous area to safe level defined by intrinsic safety standard. Safe side DC power is isolated and supplied to two-wire transmitter in explosive zone. Transmitter 4-20mA analog signal transfers back through isolation circuit to safe side DCS input card. Galvanic isolation prevents high voltage surge from safe side entering hazardous area.
Installation Requirements
- Mount on DIN rail inside safe zone control cabinet
- Separate hazardous wiring and safe wiring in different cable trays
- Use intrinsically safe certified cable for field loop
- Ambient temperature kept -40 °C to +60 °C
- Verify earth connection of barrier bus bar
- Configure loop parameters after wiring completion
- Observe ATEX installation rules for hazardous instrument loops
Precautions
- Do not install this barrier inside hazardous zone
- Match the maximum capacitance and inductance parameters for field cable
- Do not modify internal circuit components
- Check wire break diagnosis function during maintenance
- Store spare barriers in dry environment
- Do not exceed rated isolation voltage
