Foxboro ETM‑IS 31‑001 Isolation Termination Module

Technical Specifications Module Type: Intrinsic Safety Isolation Termination Module Signal Compatibility: Analog input and output signal loop Intrinsic Safety Level: Meets industrial hazardous area safety standard Operating Power: Powered via connected signal loop Operating Temperature: 0 °C to +60 °C Storage Temperature: ‑40 °C to +85 °C Relative Humidity: 5%‑95%, non‑condensing Mounting: 35 mm DIN‑rail mounting inside safe‑area control cabinet Certifications: CE, intrinsic‑safety explosion‑proof certification

Functional Features Limits voltage and current energy output to hazardous‑area field loop for intrinsic‑safety protection. Realizes bidirectional transmission of analog field signal without signal distortion. Protects DCS FBM module from over‑voltage impact coming from field side. Modular plug‑in structure facilitates maintenance and single‑loop replacement.

Application Scenarios Installed in safe‑area control cabinet for petrochemical, chemical and oil‑gas hazardous production sites. Cooperates with FBM series I/O modules and field instruments located in explosive risk zone, provides safety barrier protection for process control signal loops.

Structural Characteristics Compact DIN‑rail modular insulating housing. Screw‑type terminals for safe‑area DCS side and hazardous‑area field‑side wiring respectively. Internal integrated intrinsic‑safety voltage‑limiting and current‑limiting circuit components. Bottom DIN‑rail locking buckle for quick installation.

Working Principle When normal signal transmits, the module keeps low‑impedance state and passes field analog signal to DCS FBM module. When abnormal over‑voltage or over‑current occurs in field loop, internal limiting circuit rapidly works to clamp voltage and current within safe energy range, prevent high‑energy signal from entering hazardous zone and avoid explosion risk caused by electric spark.

Installation Requirements Mount ETM‑IS 31‑001 module on 35 mm DIN‑rail inside safe‑area control cabinet. Strictly distinguish safe‑area side and hazardous‑area side wiring terminals according to wiring drawing. Connect safe‑area terminals to FBM termination board, connect hazardous‑area terminals to field instruments in explosive zone.

Usage Notes Do not change internal circuit components of intrinsic‑safety module arbitrarily.