Description
1. Overview
SHINKAWA MP-2W2 is a high-performance dual-channel eddy current preamplifier developed by Shinkawa Electric for industrial TSI (Turbine Supervisory Instrumentation) systems, serving as the core front-end signal processing device of rotating machinery monitoring systems.Matched with SHINKAWA FK and VK series eddy current displacement sensors, it is mainly applied to high-speed rotating equipment including steam turbines, gas turbines, large generator sets and centrifugal compressors. It isolates, amplifies, filters, shapes and linearly converts weak high-frequency impedance signals collected by sensors, and outputs standard, stable and low-drift analog signals to supply high-precision original acquisition data for rear-end VM-5 series monitoring modules.
The MP-2W2 features independent signal processing for two channels with electrical isolation and no crosstalk between channels, which can realize signal preprocessing for two measuring points simultaneously. It is widely used in dynamic and static parameter monitoring scenarios such as shaft vibration, axial displacement, rotor eccentricity, cylinder differential expansion and rotor-stator clearance.With the advantages of ultra-low temperature & time drift, high signal fidelity, strong anti-electromagnetic interference capability and maintenance-free long-term operation, it perfectly adapts to harsh working conditions with high temperature, high humidity and intensive electromagnetic interference at power, chemical and oil & gas sites. It acts as a critical front-end hardware to ensure accurate, stable and reliable TSI monitoring of large rotating units.
2. Technical Features
2.1 Independent Isolated Dual-Channel Design with High Integration & Wide Applicability
It adopts a fully independent dual-channel signal acquisition and processing architecture with electrical isolation between channels to avoid signal crosstalk and mutual interference. A single unit can complete signal preprocessing for two eddy current sensors synchronously, effectively reducing the quantity of on-site installed equipment and wiring costs.It is flexibly compatible with various TSI measuring points including shaft vibration, displacement, eccentricity and differential expansion, and supports single-point and multi-point combined monitoring schemes for units. It covers a wide range of industrial scenarios including new unit matching, legacy unit renovation and module replacement.
2.2 Ultra-High Linear Signal Conversion & Long-Term Stability with Minimal Drift
Equipped with exclusive linear amplification and signal correction circuits from Shinkawa, it optimizes processing logic for weak analog signals from eddy current sensors, delivering excellent linearity in signal conversion without waveform distortion or amplitude offset.The module has extremely low temperature drift and time drift coefficients, maintaining highly consistent output signals under wide temperature fluctuation conditions. No zero offset or data drift occurs during long-term continuous operation. It can accurately restore micron-level tiny deformation and vibration fluctuation of shafting, providing authentic and reliable original signals for high-precision rear-end monitoring, fault diagnosis and condition evaluation.
2.3 Multi-Stage Filtering & Anti-Interference for Complex Industrial Electromagnetic Environments
Built-in multi-stage processing circuits for high-frequency clutter suppression, electromagnetic isolation and line anti-jitter can effectively filter high-frequency interference, electromagnetic noise and voltage surges generated by inverter startup/shutdown, operation of high-power equipment and power grid fluctuation on site.It fundamentally eliminates common drawbacks of traditional preamplifiers such as susceptibility to environmental interference, data jitter and signal jumping, and ensures stable and pure signals throughout all working conditions including unit barring, warming-up, startup & shutdown transients, load variation and steady-state operation.
2.4 Full Compatibility with Sensors & Strong System Adaptability
It is natively compatible with the full range of SHINKAWA FK and VK eddy current displacement sensors with multiple probe measuring ranges, and can seamlessly work with the complete SHINKAWA VM-5 TSI monitoring system with simple wiring and no complex configuration commissioning.It also supports mainstream eddy current sensing devices of the same type in the industry, and can directly replace domestic and overseas dual-channel preamplifiers of equivalent specifications. It is applicable to upgrade renovation of legacy TSI systems and online replacement of faulty equipment without modifying on-site wiring and system programs.
2.5 Industrial Triple-Proof Rugged Structure for Maintenance-Free Long-Term Operation
Adopting an integrated fully sealed modular triple-proof (dustproof, moisture-proof, anti-corrosion) structure, it features wide temperature resistance, aging resistance, vibration resistance and powerful anti-electromagnetic interference performance to adapt to harsh industrial environments.There are no vulnerable adjustable components inside the unit; the circuit structure is stable with an extremely low failure rate. It supports 24/7 non-stop continuous operation, meets unattended operation and maintenance requirements of power plants and chemical plants, and greatly reduces later maintenance costs and shutdown risks.
3. Specification Parameters
3.1 Basic Model Parameters
- Model: MP-2W2
- Brand & Series: SHINKAWA TSI System Front-End Supporting Equipment
- Device Type: Dual-Channel Eddy Current Sensor Preamplifier
- Compliance Standard: API 670 International Standard for Rotating Machinery Monitoring
- Core Functions: Isolation, high-frequency amplification, clutter filtering, waveform shaping and linear preprocessing of dual-channel eddy current signals; output standard and stable signals for rear-end monitoring modules
- Compatible System: SHINKAWA VM-5 Series TSI Turbine Supervisory Instrumentation System
- Applicable Equipment: Steam turbines, gas turbines, generator sets, large centrifugal compressors and industrial high-speed rotating units
3.2 Acquisition & Signal Performance Parameters
- Channel Configuration: Independent signal processing for two channels with complete electrical isolation and zero crosstalk
- Compatible Sensors: SHINKAWA FK/VK series eddy current displacement sensors and general industrial non-contact eddy current sensors
- Processed Signal: High-frequency weak impedance analog signals from sensors
- Signal Characteristics: High linear conversion, low distortion, ultra-low temperature drift and ultra-low time drift
- Anti-Interference Capacity: High-frequency clutter suppression, electromagnetic noise reduction and line jitter shaping
- Stability Performance: No zero drift, data jump or signal distortion during long-term continuous operation
3.3 Electrical Parameters
- Operating Power Supply: Standard industrial 24 VDC direct current power supply
- Output Signal: Standardized linear analog signal for precise acquisition by rear-end TSI modules
- Protection Mechanism: Built-in automatic protection against overvoltage, overcurrent, short circuit, sensor open circuit and abnormal signals
- Power Consumption: Low-power design suitable for long-term non-stop operation
3.4 Environmental Parameters
- Operating Temperature: -40 ℃ ~ +70 ℃ for stable operation over wide temperature range
- Storage Temperature: -55 ℃ ~ +125 ℃
- Operating Humidity: 5% ~ 95% RH (non-condensing)
- EMC Compliance: Meets industrial EMC standards to withstand strong electromagnetic interference in power and chemical plants
- Protection Structure: Fully sealed triple-proof reinforced structure with dust, moisture and aging resistance
- Operation Mode: 24-hour non-stop continuous stable monitoring
3.5 Mechanical & Maintenance Parameters
- Mounting Method: Universal wall-mounted and cabinet embedded installation applicable to various industrial cabinet scenarios
- Structural Features: Highly integrated monolithic design with shock resistance, impact resistance, aging resistance and ultra-low failure rate
- Operation & Maintenance Features: Plug-and-play without complex calibration and commissioning; supports online replacement and maintenance-free long-term operation
- Applicable Scenarios: New system complete set, legacy system renovation, faulty preamplifier replacement and multi-point measuring point expansion
4. Working Principle
As the primary front-end signal processing unit of the TSI system, the SHINKAWA MP-2W2 dual-channel preamplifier adopts an independent closed-loop preprocessing mechanism for each channel.
After power-on, the unit automatically completes hardware self-test, power supply detection and loop verification, and enters normal signal processing mode once all statuses are confirmed normal.
During unit operation, two eddy current sensors collect weak high-frequency original signals including shaft vibration, axial displacement, thermal expansion clearance and rotor eccentricity in real time, and transmit them synchronously to the input ports of the preamplifier.
Through independent high-frequency amplification circuits, electromagnetic isolation units and multi-stage filtering modules, the preamplifier amplifies, denoises, shapes and linearly corrects the two channels of signals respectively. It accurately eliminates invalid false data caused by on-site electromagnetic interference, line clutter and environmental disturbance, and retains authentic dynamic vibration and static displacement deformation signals of the shafting.
The preprocessed standardized pure signals are stably output to rear-end VM-5 series monitoring modules for data calculation, threshold comparison, status judgment, alarm interlock and data upload.The device monitors power supply status, sensor loop continuity and signal quality in real time throughout operation. Once faults such as sensor open circuit, line short circuit, out-of-range signal and loop abnormality are detected, it will lock the abnormal state automatically to prevent false acquisition and false alarm of rear-end modules, and guarantee the accuracy, stability and safety of the entire TSI monitoring system starting from the signal source.
5. Application Scenarios
5.1 TSI Monitoring Systems for Turbo-Generator Sets in Power Plants
Widely used in TSI systems of steam turbines and gas turbine units for thermal power, cogeneration and combined-cycle power plants, it provides dual-channel front-end signal preprocessing for core measuring points such as shaft vibration, axial displacement, rotor eccentricity and cylinder differential expansion.It covers all working conditions including unit barring, warming-up, startup & shutdown, load variation and steady power generation, ensures distortion-free and pure shafting monitoring signals, and delivers basic signal support for unit safety interlock, condition evaluation and fault early warning.
5.2 Condition Monitoring for Large Rotating Equipment in Chemical & Oil & Gas Industries
Applicable to key rotating equipment such as large centrifugal compressors, blowers and high-speed pump sets in chemical, oil & gas and coal chemical industries. It realizes high-precision signal conversion for shafting displacement and vibration monitoring of equipment.It effectively resists harsh field conditions including intensive electromagnetic interference and temperature & humidity fluctuation, stably captures tiny abnormal signals of equipment, supports predictive maintenance and advance fault prediction, and ensures continuous stable production of production lines.
5.3 Complete Matching & Upgrade Renovation of New and Legacy TSI Systems
It can be directly matched with brand-new complete SHINKAWA VM-5 TSI systems, and is fully compatible with legacy SHINKAWA TSI equipment. Faulty legacy preamplifiers can be replaced online without modifying on-site wiring and reconfiguring parameters, which rapidly restores system monitoring accuracy and stability, greatly shortens renovation construction period and cuts equipment operation & maintenance and renovation costs.
5.4 Special High-Precision Monitoring for Static Shafting Faults
Benefiting from ultra-low drift, high linearity and high-fidelity signal processing capability, it supports accurate monitoring of latent static faults which cannot be captured by conventional vibration monitoring, such as rotor thermal bending, residual eccentricity, insufficient warming-up and excessive thermal expansion deviation.It makes up for the defects of ordinary preamplifiers including insufficient precision, severe signal drift and obvious data jitter, and comprehensively improves the refined monitoring and fault diagnosis capability of unit shafting.
