Foxboro FBM02
Foxboro FBM02 - Image 2

Foxboro FBM02

Product Introduction: The Foxboro FBM02 is an 8-channel thermocouple/millivolt input module for the Foxboro I/A Series DCS. It provides isolated analog inputs for standard thermocouple types and low-level DC voltage signals, with high accuracy and robust noise immunity for industrial temperature measurement applications. It also includes an isolated RTD reference junction (cold junction) compensation channel for accurate thermocouple measurements.

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Category: SKU: Foxboro FBM02

Description

Foxboro FBM02

  • Technical Specifications:
    • Channel Count: 8 isolated channels for thermocouple/mV signals; plus one isolated RTD reference junction compensation channel
    • Input Types: Standard thermocouples (e.g., Type J, K, T, E, etc. depending on configuration) and mV DC signals
    • Accuracy: High accuracy with sigma-delta A/D conversion per channel; typical accuracy ±0.05% to ±0.1% of reading (refer to manual)
    • Isolation: Each channel is electrically isolated from other channels and ground
    • A/D Conversion: Sigma-delta per channel; update interval approximately 25 ms; configurable integration times
    • Communication: Redundant 2 Mbps module fieldbus to Foxboro control processors via Fieldbus Communication Module (FCM) or Field Control Processor (FCP)
    • Power: 24 V DC (±10%); power dissipation typically less than 7 W
    • Environment: Operating temperature -20 °C to +70 °C; relative humidity 5% to 95% non-condensing
    • Dimensions: Approx. 10.4 cm × 4.5 cm × 11.4 cm; weight approx. 0.284 kg
    • Mounting: DIN-rail or baseplate mounting (200 series baseplate)
  • Functional Features:
    • High precision per-channel sigma-delta A/D conversion
    • Software-configurable integration time and rate-of-change (ROC) alarm
    • Supports 2-wire and 3-wire RTD compensation via dedicated compensation channel
    • Front-panel LEDs indicate module status and communication health
    • Hot-swappable (with appropriate terminal block) to avoid system downtime
  • Application Scenarios:
    • Temperature measurement in furnaces, reactors, heat exchangers, and exhaust gas systems
    • Process industries including power generation, oil and gas, chemical processing, and metals
    • Applications requiring high-accuracy thermocouple or low-voltage measurements
  • Performance Parameters:
    • Fast, stable conversions suitable for control loops and safety interlocks
    • High noise immunity via channel isolation and filtering
    • Long-term stability and accuracy in harsh environments
  • Material and Structural Characteristics:
    • Housing: Sturdy extruded aluminum enclosure with front-panel indicators
    • Connectors: High-density industrial connectors for fieldbus and I/O wiring
    • PCB: Industrial-grade PCB with conformal coating options
  • Working Principle:
    • Each channel conditions the input thermocouple or mV signal and digitizes it using a sigma-delta ADC. The RTD compensation channel measures the terminal block temperature to provide cold-junction compensation. Data is transmitted over the 2 Mbps module fieldbus to the controller.
  • Installation Requirements:
    • Install in a DIN-rail or baseplate designed for 200 series FBM modules
    • Connect thermocouple or mV field wiring via the terminal block
    • Configure input types, ranges, and filtering parameters via engineering tools
    • Ensure correct wiring polarity and shielding for noisy environments
  • Usage Notes:
    • Use thermocouple extension wire compatible with the input type and application
    • Verify configuration of thermocouple type and compensation settings
    • Periodically verify accuracy against reference measurements
    • Observe grounding and isolation guidelines to maintain measurement integrity

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