Yokogawa VI-702

Description

Product Description

Product Parameters

• Brand/Model: Yokogawa VI-702
• Core Measurement Parameters
  • Input Channels: 4 isolated vibration input channels
  • Compatible Sensors: Accelerometers (ICP/IEPE type, 24V DC excitation), velocity sensors (magnetoelectric type)
  • Measurement Range: 0-50 mm/s (velocity), 0-200 m/s² (acceleration), 0-500 μm (displacement)
  • Resolution: 16-bit ADC (0.01 mm/s for velocity, 0.01 m/s² for acceleration)
  • Frequency Response: 0.1 Hz to 10 kHz (flat response ±1 dB)
• Signal Processing & System Parameters
  • Signal Conditioning: Built-in charge amplifier (for accelerometers), low-pass/high-pass filters (configurable)
  • Alarm Functions: User-definable high/low vibration alarms (per ISO 10816), trend monitoring
  • Communication Protocol: Modbus TCP/IP, BACnet/IP (integrated with Centum VP/PRM)
  • Configuration Software: Yokogawa PRM Studio, Centum VP Engineering Environment
• Environmental & Physical Parameters
  • Operating Temperature: -10°C ~ +60°C
  • Storage Temperature: -40°C ~ +85°C
  • Vibration Resistance: 5g (10-500Hz, IEC 60068-2-6 standard)
  • Power Supply: 24V DC (18-32V wide range), power consumption ≤ 15W (including sensor excitation)
  • Protection Grade: IP20 (cabinet installation)
  • Installation Method: DIN 35mm rail mounting or Yokogawa standard rack installation
  • Dimensions: 140mm × 120mm × 45mm

Advantages & Features

1. High-Precision Vibration Measurement: Yokogawa VI-702 delivers 16-bit resolution and wide frequency response, enabling accurate detection of subtle vibration changes that indicate early-stage mechanical faults (e.g., bearing wear, misalignment, imbalance). Compliance with ISO 10816 ensures consistent, industry-standard measurement.
2. Integrated Sensor Excitation & Conditioning: The module provides 24V DC excitation for ICP/IEPE accelerometers and built-in signal conditioning, eliminating the need for external amplifiers or signal converters. This simplifies wiring and reduces system complexity.
3. Seamless Asset Health Integration: Yokogawa VI-702 connects directly to Yokogawa’s PRM software, enabling real-time vibration trend analysis, alarm notifications, and predictive maintenance scheduling. This integration transforms raw vibration data into actionable insights for equipment reliability teams.
4. Robust Industrial Design: With wide temperature tolerance and vibration resistance, Yokogawa VI-702 operates reliably in harsh industrial environments, including motor control centers, pump stations, and turbine enclosures. Isolated channels prevent cross-talk and electromagnetic interference (EMI) from nearby equipment.

Application Fields & Cases

1. Power Plant Turbine Vibration Monitoring: A combined-cycle power plant deployed Yokogawa VI-702 modules to monitor gas turbine vibration levels. The modules detected a 15% increase in bearing vibration (from 2.5 mm/s to 2.875 mm/s) weeks before a potential failure, allowing maintenance teams to schedule a planned outage and replace the bearing, avoiding a costly unplanned shutdown.
2. Oil Refinery Pump Health Management: An oil refinery integrated Yokogawa VI-702 into its PRM system to monitor critical crude oil transfer pumps. The module’s high-resolution measurement identified impeller imbalance in one pump, triggering an alarm before the imbalance caused seal damage or pump seizure.
3. Manufacturing Plant Motor Protection: A automotive manufacturing plant used Yokogawa VI-702 to monitor vibration in production line motors. The module’s frequency response (0.1 Hz to 10 kHz) detected gearbox wear in a conveyor motor, enabling proactive replacement and preventing a production line outage that would have cost $50,000/hour in downtime.

Competitor Comparison

Selection Suggestions & Precautions

1. Selection Suggestions: Yokogawa VI-702 is ideal for Yokogawa Centum VP/PRM users implementing predictive maintenance programs for rotating machinery. For applications requiring 8 channels, Yokogawa VI-704 is recommended. Users with Bently Nevada systems may prefer the 3500/42M for native integration.
2. Precautions:
   • Use shielded twisted-pair cables for sensor wiring to minimize EMI and ensure accurate vibration measurement.
   • Calibrate sensors and modules annually (per ISO 10816 guidelines) to maintain measurement accuracy.
   • Configure alarm thresholds based on equipment type (e.g., pumps vs. turbines) and ISO 10816 severity levels to avoid false alarms.
   • Ensure proper grounding of the module and sensors to prevent ground loops, which can distort vibration signals.
   • Verify sensor excitation voltage (24V DC for ICP/IEPE) matches Yokogawa VI-702 output to avoid sensor damage.

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