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GE VMIVME-3230

1. Core Architecture

  • Function: 8-channel thermocouple input module for industrial temperature monitoring, designed for VMEbus-based control systems .
  • Signal Compatibility: Supports J, K, T, E, R, S, B, N-type thermocouples with automatic cold-junction compensation (CJC) .
  • Resolution: 16-bit analog-to-digital converter (ADC) for high-precision measurements (±0.1% full-scale accuracy) .
  • Input Range:
    • Voltage: ±50 mV to ±100 mV (programmable) .
    • Temperature Range: -200°C to +1820°C (dependent on thermocouple type) .
  • Bus Standard: VME64-compliant with A16/A24 addressing and BLT32 block transfers .
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Detailed content

2. Signal Processing & Diagnostics

  • Noise Rejection:
    • Built-in 50/60 Hz notch filters for industrial EMI suppression .
    • Optical isolation (≥1,500V channel-to-bus) for ground-loop elimination .
  • Self-Diagnostics:
    • Open-circuit detection for thermocouple faults .
    • LED status indicators per channel (power, fault, data validity) .
  • Sampling Rate: 10 samples/second per channel (hardware-synchronized) .

3. Environmental & Electrical

  • Operating Temperature: 0°C to +60°C (industrial standard) .
  • Humidity Tolerance: 5–95% non-condensing .
  • Power Requirements: +5VDC ±5% (logic), ±15VDC (analog circuitry); typical consumption 8W .
  • Compliance: CE Mark, RoHS, CISPR 24 EMC immunity .

Functional Features

  1. High-Accuracy Temperature Capture:
    • Automatic linearization: Converts raw thermocouple voltages to industry-standard temperature units (℃/℉) via on-board algorithms .
    • Programmable gain amplifiers (PGAs): Adapts sensitivity for low-voltage thermocouple signals (e.g., Type B) .
  2. Real-Time Industrial Integration:
    • Synchronized sampling: Hardware triggers align measurements with PLC control cycles (e.g., drying processes in PVC production) .
    • VMEbus DMA support: Direct memory transfers bypass CPU overhead for deterministic latency .
  3. Fault Resilience:
    • Redundant CJC sensors: Ensures cold-junction accuracy even if one sensor fails .
    • Watchdog timer: Resets the module on communication faults .

Application Scenarios

Domain Use Cases Key Capabilities Utilized
Chemical Processing Reactor temperature monitoring in PVC/polymer production lines 8-channel density; Type K/T thermocouple support; EMI filtering .
Power Generation Exhaust gas temperature sensing in turbines and boilers 16-bit ADC for ±0.1% accuracy; -200°C to +1820°C range .
Manufacturing Injection molding thermal control, metal heat treatment furnaces Open-circuit detection; optical isolation for noisy environments .
Pharmaceuticals Sterilization autoclave validation and batch process monitoring Automatic CJC; hardware-synchronized sampling .

Technical Differentiation

Parameter VMIVME-3230 Standard Thermocouple Cards
ADC Resolution 16-bit 12–14-bit
Noise Immunity 50/60 Hz notch filters + optical isolation Basic shielding only
Thermocouple Types 8 industry-standard types ≤4 types
Diagnostics Per-channel LEDs + open-circuit detection Limited global alerts

Integration & Ecosystem

  • Software Support:
    • Native drivers for GE Proficy® Cimplicity, Rockwell ControlLogix, and Siemens Step 7 .
    • APIs for C/C++, Python, and LabVIEW for custom applications .
  • Hardware Compatibility:
    • Plug-and-play with GE VMIC CPU boards (e.g., VMIVME-7750) .
    • VME64x backplanes and VMIACC transition carriers for legacy upgrades .
  • Calibration Tools:
    • GE CALMAN-3230 software for field calibration .

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