Foxboro FBM203
Foxboro FBM203 - Image 2

Foxboro FBM203

Product Introduction: The Foxboro FBM203 is an 8-channel isolated RTD (resistance temperature detector) input module for the I/A Series DCS, designed for high-accuracy temperature measurement using platinum or nickel RTDs (e.g., Pt100, Pt1000, Ni120). It provides channel-to-channel and channel-to-ground isolation, Sigma-Delta A/D conversion, and configurable options to support industrial temperature monitoring in harsh environments.

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Category: SKU: Foxboro FBM203

Description

Foxboro FBM203

  • Technical Specifications:
    • Channels: 8 isolated independent RTD input channels
    • Input Types:
      • FBM203: 0–320 Ω (2-wire or 3-wire)
      • FBM203b: 0–640 Ω (2-wire or 3-wire; Pt1000/high-temp platinum)
      • FBM203c: 0–30 Ω (2-wire or 3-wire; Ni120/Cu10)
      • FBM203d: 0–320 Ω (4-wire high-precision)
    • Supported Sensors: Platinum (IEC, DIN, SAMA), nickel (SAMA), copper Cu10
    • Accuracy: ±0.05% of span (typical; per datasheet)
    • Sensor Excitation: 0.2 mA DC nominal (constant current)
    • Lead Wire Compensation: 2-wire (no lead compensation), 3-wire, 4-wire (depending on variant)
    • A/D: Per-channel Sigma-Delta; update 25 ms; configurable integration cycles (50/60 Hz rejection)
    • Isolation: Channel-to-channel and channel-to-ground isolation (600 V AC per 1 minute test)
    • Communication: Redundant 2 Mbps module fieldbus to FCM/FCP
    • Power: 24 V DC; power dissipation < 3 W
    • Environment: 20 °C to +70 °C (operating); Class G3 harsh environment
    • Dimensions: Approx. 10.4 cm × 4.5 cm × 11.4 cm; weight ~0.284 kg
  • Functional Features:
    • High accuracy with per-channel Sigma-Delta A/D conversion
    • Automatic open-circuit, short-circuit, and over-range diagnostics per channel
    • Software-configurable scaling, filtering, rate-of-change limits, and units
    • Hot-swappable (requires appropriate baseboard and terminal assembly)
    • LED indicators for module status
  • Application Scenarios:
    • RTD-based temperature measurement in process vessels, pipes, and equipment
    • High-precision applications in power generation (e.g., turbine bearings, windings)
    • General temperature monitoring in chemical, petrochemical, and pharmaceutical processes
  • Performance Parameters:
    • Excellent stability and repeatability across the operating range
    • High common-mode noise rejection due to isolation and filtering
  • Material and Structural Characteristics:
    • Housing: Stamped aluminum enclosure for robust physical protection
    • Connectors: Industrial-grade connectors for fieldbus and terminal interfaces
    • PCB: Conformal-coated to resist moisture and contaminants
  • Working Principle:
    • A constant current excitation passes through the; the voltage across the RTD is measured and converted to temperature using the resistance–temperature relationship. Isolation and filtering ensure noise immunity and safety.
  • Installation Requirements:
    • Mount on a DIN-rail or baseboard designed for 200 series FBM modules
    • Connect RTD sensors via the terminal block, observing 2/3/4-wiring requirements per variant
    • Configure RTD type, range, and parameters via engineering tools
  • Usage Notes:
    • Use RTDs matching the configured type and resistance range
    • Verify correct wiring (especially for 3-wire and 4-wire configurations)
    • Perform periodic verification of input accuracy
    • Ensure grounding per system recommendations

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