Technical Specifications Rated operating voltage is DC 24V. Operating ambient temperature ranges from ‑40℃ to +85℃. Relative humidity condition is 5%‑95%, non‑condensing. Protection grade reaches IP20. Adopts standard DIN‑rail installation structure. It matches analog 4‑20mA loop signal circuit of Foxboro I/A series system.
Functional Features Provides accurate impedance matching for analog signal loops. Effectively reduces signal reflection distortion caused by long‑distance cable transmission. Suppresses signal oscillation triggered by complex site electromagnetic disturbance. Compact modular structure is convenient for cabinet internal layout installation. Supports fast replacement during equipment maintenance.
Application Scenarios Oil‑gas processing plant DCS control cabinet, petrochemical refining workshop analog signal loop, chemical synthesis production control system, thermal power plant auxiliary instrument control cabinet, metallurgical process automation, water treatment distributed control system.
Structural Characteristics Compact industrial‑grade modular plastic housing. Built‑in DIN‑rail clamping buckle for quick mounting and dismounting. Multi‑group screw‑type wiring terminals on the side for signal loop access.
Working Principle Foxboro RH916XZ is connected in series or parallel into the field analog instrument signal loop. It provides matched load impedance for the whole loop circuit. It eliminates impedance mismatch between long‑distance transmission cable and control system I/O channel, restrains signal reflection and echo effect, and ensures analog signal can be accurately transmitted back to DCS system controller.
Installation Requirements Mount the module on standard DIN‑rail inside the control cabinet. Tighten all screw‑type wiring terminals to prevent poor contact caused by vibration. Keep installation position away from high‑voltage power cables and strong electromagnetic interference sources.
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