Description
Foxboro RH916TA
Technical Specifications
- Terminal Type: Spring-clamp or screw-type terminals (specifics depend on variant).
- Wire Gauge: Typically supports 24 to 12 AWG (0.2 to 4 mm²) wires.
- System Compatibility: Designed for use with specific Foxboro FBM modules.
Functional Features
- Safe Disconnection: Allows field wiring to remain intact while the electronic FBM module is removed for maintenance or replacement.
- Signal Protection: Often includes built-in fuses, surge suppression, or isolation barriers to protect the expensive FBM from field faults.
- Organized Wiring: Provides a structured and labeled termination point, simplifying installation and troubleshooting.
- Loop Power: Certain variants provide loop power for 2-wire field transmitters.
Application Scenarios
Used in every I/O point installation within a Foxboro DCS, from simple temperature monitoring to complex valve control loops in refineries, power plants, and water treatment facilities.
Performance Parameters
- Current Rating: Typically rated for 2A to 5A per terminal, depending on the specific model.
- Voltage Rating: Suitable for standard industrial control voltages (24VDC, 120VAC, etc.).
- Environmental Rating: Matches the G3 harsh environment rating of the associated FBM.
Material Composition
Housing is made from high-impact, flame-retardant thermoplastic. Terminals are manufactured from copper alloy with tin or silver plating to ensure low contact resistance and long-term reliability.
Structural Characteristics
A compact, DIN-rail mountable or baseplate-mounted block with clearly labeled terminal positions. Features a plug-in connector on the back that mates precisely with the FBM module.
Working Principle
Acts as a passive electrical bridge. Field cables are terminated on the front or top of the RH916TA. Internal metal traces route the signals through any protection circuitry to the rear connector, which plugs directly into the FBM module, completing the circuit to the control system.
Installation Requirements
Must be mounted on a standard DIN rail or the designated FBM baseplate. Field wires must be stripped to the correct length and securely terminated. Proper torque must be applied to screw terminals.
Usage Precautions
- Always verify that the FTA model matches the FBM module it is intended for.
- Never attempt to remove an FBM without first ensuring the associated FTA is properly seated and field wiring is safe.
- Inspect terminals periodically for signs of corrosion or overheating, especially in harsh environments.
