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The MTL 8507-BI-DP is a dual-channel, intrinsically safe (IS) isolator and repeater from Eaton’s MTL Instruments range, designed for secure signal conditioning and protocol conversion in hazardous industrial environments. This device bridges field instruments in Zone 0/1/2 (e.g., transmitters, switches) with control systems using DeviceNet™ networks while maintaining intrinsic safety barriers per IEC/ATEX standards. The 8507-BI-DP converts 4–20mA analog signals to DeviceNet digital messages with galvanic isolation up to 2.5kV AC, eliminating ground loops and protecting sensitive DCS/PLC equipment from transient surges. As a key component in MTL’s 8500 series, it enables reliable data acquisition from explosive atmospheres in oil refineries, chemical plants, and mining operations. Its rugged, DIN-rail-mount design and SIL 3 certification (IEC 61508) ensure fail-safe operation where electrical faults could trigger catastrophic events.
MTL 8507-BI-DP
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | MTL 8507-BI-DP |
| Manufacturer | Eaton (MTL Instruments) |
| Product Type | Intrinsic Safety (IS) Barrier / DeviceNet Isolator |
| Input Channels | 2 (4–20mA passive/active) |
| Output Protocol | DeviceNet (CAN-based) |
| Galvanic Isolation | 2.5 kV AC (field to bus) |
| Intrinsic Safety | [Ex ia] IIC / [Ex ib] IIC (ATEX/IECEx) |
| Safety Integrity | SIL 3 (IEC 61508) |
| Entity Parameters | Ui=30V, Ii=330mA, Pi=1.1W, Ci=5μF, Li=10mH |
| Operating Temperature | -40°C to +80°C (-40°F to +176°F) |
| Power Supply | 11–30 VDC (DeviceNet bus-powered) |
| DeviceNet Data Rate | 125/250/500 kbps (auto-sensing) |
| Housing Protection | IP20 (panel-mounted) |
| Dimensions | 22.5 mm × 99 mm × 114 mm (W×H×D) |
Main Features and Advantages
Hazardous Area Protection: The MTL 8507-BI-DP delivers certified intrinsic safety (IS) for two field circuits, limiting energy to <1>
Seamless DeviceNet Integration: Converts analog signals to CANopen-based DeviceNet messaging, enabling direct integration with PLCs like Allen-Bradley ControlLogix. Supports auto-baud detection (125–500 kbps) and plug-and-play node addressing via DIP switches. Built-in transient protection (IEC 61000-4) ensures noise immunity in electrically harsh environments.
Diagnostics & Configuration: Per-channel LED indicators (power, comms, fault) simplify troubleshooting. Configurable via Eaton’s MTL Connect software for custom scaling, alarm thresholds, and data filtering. Hot-swappable design allows maintenance without network downtime.
Application Field
The MTL 8507-BI-DP is deployed where explosive gases/dusts demand intrinsic safety:
Oil & Gas: Interfaces pressure/temperature transmitters in ATEX Zone 1 refinery process units, enabling real-time monitoring via DeviceNet without spark risk.
Chemical Plants: Connects pH sensors and flow meters in solvent handling areas (IIC gas groups) to Yokogawa DCS systems.
Mining: Links methane detectors in coal tunnels to safety shutdown systems via DeviceNet backbones.
Pharmaceutical: Isolates bioreactor instrumentation in ethanol-saturated environments (Zone 0).
MTL 8507-BI-DP
Related Products
MTL 8541-BI-DP: 4-channel analog isolator for higher-density applications.
MTL 8381-B: Zener diode barrier for non-network installations.
MTL 9300-RJ45: DeviceNet T-tap connector for 8507-BI-DP daisy-chaining.
MTL 5500: Surge protector for DeviceNet trunk lines.
MTL Connect Software: Configuration suite for Eaton IS barriers.
Installation and Maintenance
Pre-installation preparation: Verify DeviceNet trunk cable termination (120Ω) and select safe-area mounting location (Zone 2/Non-haz). Calculate entity parameters (Ui/Ii/Pi) for connected field devices using MTL’s iSPARK tool. Set DeviceNet node address via DIP switches before power-up.
Maintenance recommendations: Quarterly visual inspection for connector corrosion. Annually verify IS earth grounding (<1>
