Overview

The FBM202 Thermocouple/mV Input Module features eight isolated thermocouple/mV input channels and one RTD reference junction compensation channel. It supports various thermocouple types for temperature measurement, including B, E, J, K, N, R, S, T, and other millivolt signals. The module offers galvanic isolation for each channel and includes thermocouple burnout detection. It communicates over an optionally redundant Fieldbus to provide accurate temperature readings and configurable options for signal integration.

Functional Specifications

• Input Channels
  • 8 isolated thermocouple/mV input channels
  • 1 isolated RTD reference junction compensation channel
• Input Range
  • –10.5 to +69.5 mV dc (0 to 64000 raw counts)
  • 71.419 mV = 65535 raw counts (full range)
• Accuracy
  • Millivolt Input: ±0.03% of span (±24 µV at 25°C)
  • RTD Channel: ±0.03% of span
  • RTD Reference Junction Conformity: ±0.25°C
  • Thermocouple Conformity: ±0.25°C
  • Temperature Coefficient: ±50 ppm/°C
  • RTD Measurement Accuracy: ±0.50°C (when using Foxboro termination assemblies)
• Differential Input Impedance
  • 10 MΩ
• Common Mode Voltage
  • Up to 30 V ac or 60 V dc
• Integration Period
  • Software configurable
• Open Circuit Voltage
  • 250 mV dc through 10 MΩ (for mV channels)
• A/D Conversion
  • Sigma-Delta converter for each channel
• Thermocouple Burnout Detection
  • Full upscale value
• Input Channel Isolation
  • Galvanically isolated from all other channels and ground
  • Withstands 600 V ac for 1 minute

Communication

• Communicates with the associated FCM or FCP via the redundant 2 Mbps Fieldbus.

Power Requirements

• Input Voltage Range (Redundant)
  • 24 V dc ±5%, -10%
• Consumption
  • 3 W (maximum)
• Heat Dissipation
  • 3 W (maximum)
• Calibration
  • No calibration required for the module or termination assembly

Environmental Specifications

• Operating Temperature
  • Module: -20 to +70°C (-4 to +158°F)
  • Termination Assembly: -20 to +70°C (-4 to +158°F)
• Storage Temperature
  • -40 to +70°C (-40 to +158°F)
• Relative Humidity
  • 5 to 95% (non-condensing)
• Altitude
  • Operating: -300 to +3,000 m (-1,000 to +10,000 ft)
  • Storage: -300 to +12,000 m (-1,000 to +40,000 ft)
• Contamination
  • Suitable for Class G3 (Harsh) environments per ISA Standard S71.04
• Vibration Resistance
  • 0.75 m/s² (5 to 500 Hz)

Physical Specifications

• Module Dimensions
  • Height: 102 mm (4 in)
  • Width: 45 mm (1.75 in)
  • Depth: 104 mm (4.11 in)
  • Height with mounting lugs: 114 mm (4.5 in)
• Weight
  • Module: 284 g (10 oz)
  • Termination Assemblies:
    • Compression Type (DIN Rail Mounted): 159 g (0.35 lb)
    • Compression Type (Baseplate Mounted): 245 g (0.57 lb)
    • Ring Lug Type: 204 g (0.45 lb)

Termination Cables

• Cable Lengths
  • Up to 30 m (98 ft)
• Cable Materials
  • Polyurethane or Low Smoke Zero Halogen (LSZH)
• Cable Type
  • Type 2
• Cable Connections
  • FBM Baseplate End: 37-pin D-subminiature
  • Termination Assembly End: 25-pin D-subminiature

Termination Assembly Construction

• Materials
  • DIN Rail Mounted TAs: Polyamide (PA), compression, and ring lug
  • Baseplate Mounted TAs: Polycarbonate/Acrylonitrile Butadiene Styrene (PC/ABS), compression

Field Termination Connections

• DIN Rail TA Compression-type Wiring Sizes
  • Solid/Stranded/AWG: 0.2 to 4 mm² (24 to 12 AWG)
  • Stranded with Ferrules: 0.2 to 2.5 mm² with or without plastic collar
• Baseplate Mounted TA Compression-type Wiring Sizes
  • Solid/Stranded/AWG: 0.2 to 1.5 mm² (24 to 16 AWG)
  • Stranded with Ferrules: 0.25 to 0.75 mm² (with plastic collar)
  • 0.25 to 1.5 mm² (without plastic collar)
• Ring Lug Wiring Sizes
  • #6 size connectors (0.375 in/9.5 mm)
  • 0.5 to 4 mm² (22 AWG to 12 AWG)