• Core Function: Provides intrinsically safe interface for I/O modules in hazardous areas, allowing connection of field devices in explosive atmospheres.
Manufacturer: Emerson Part number: EMERSON 8922-RB-IS PAC8000
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8922-RB-IS: Product OverviewThe EMERSON 8922-RB-IS is an Intrinsically Safe (IS) I/O base unit designed for the PAC8000 Process Automation Controller system. This specialized module serves as a critical safety interface between the control system and field devices located in hazardous areas where explosive atmospheres may be present. Its primary function is to provide energy limitation and isolation that prevents the PAC8000 system from igniting flammable gases, vapors, or dusts in classified hazardous locations.The module operates by incorporating intrinsic safety barriers that limit the electrical energy (voltage and current) available to field devices, ensuring that any spark or thermal effect generated in the field circuit is below the ignition energy of the hazardous atmosphere. Installed in a PAC8000 chassis, it accepts various I/O modules (analog input, digital input, etc.) and provides the necessary protection for field wiring connected to devices in Zone 0/1/2 or Division 1/2 hazardous areas. This design enables the safe monitoring and control of field instruments like transmitters, solenoid valves, and switches in potentially explosive environments.
Emerson 8922-RB-IS
8922-RB-IS: Technical Specifications
• Model Number: 8922-RB-IS
• Manufacturer: Emerson
• Product Type: Intrinsically Safe I/O Base
• Compatible System: PAC8000 Process Automation Controller
• Hazardous Area Certification: ATEX, IECEx, CSA, FM
• Hazardous Area Classification: Zone 0/1/2, Division 1/2
• I/O Compatibility: Accepts various PAC8000 I/O modules
• Field Connections: Screw terminal blocks for field wiring
• Power Supply: Powered via PAC8000 backplane
• Isolation: Field-to-system isolation
• Operating Temperature: -40°C to +70°C
• Certifications: ATEX, IECEx, FM, CSA, UL
• Enclosure Rating: Suitable for harsh environments
Emerson 8922-RB-IS
Core Features & Customer ValueThe primary value of this module is its intrinsic safety protection, which enables the use of standard PAC8000 control systems in hazardous areas without requiring expensive explosion-proof enclosures or purging systems. For plant engineers working in oil & gas, chemical, or pharmaceutical industries, this significantly reduces installation costs while maintaining the highest level of safety. The module’s modular design allows flexibility in configuring exactly the right I/O mix for each hazardous area application.The comprehensive certifications (ATEX, IECEx, FM, CSA) ensure global acceptance and compliance with international safety standards. For maintenance teams, the integrated diagnostics and status indicators facilitate quick troubleshooting. The ability to use standard field devices without special protection methods reduces spare part inventory and simplifies maintenance procedures. This approach provides both capital and operational cost savings while ensuring operational safety in critical environments.Typical ApplicationsIn oil and gas production facilities, the 8922-RB-IS base connects to pressure transmitters and valve positioners located in Zone 1 areas where flammable gases may be present.In chemical processing plants, it interfaces with level sensors and temperature transmitters in Division 1 areas where explosive vapors could form during normal operations.
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