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　　I. Core Structure and Working Principle

　　1. Sensing Core: Symmetrical shear mode polycrystalline piezoelectric element, with an integrally insulated shell to eliminate ground loop interference and resist industrial electromagnetic noise.

　　2. Built-in Signal Conditioning Circuit: Internally completes charge-to-current conversion, eliminating the need for an external charge amplifier; unlike ordinary IEPE voltage output, it adopts current modulation two-wire output, ensuring no attenuation over long distances. The two-wire current output is suitable for long-distance vibration protection monitoring of explosion-proof units.

　　3. Outgoing Cable Protection: Standard configuration includes a stainless steel corrugated pipe integrated sealed cable, completely waterproof, lubricating oil, steam, and coolant-resistant, suitable for installation in unit oil tanks and high-temperature chambers.

　　II. Core Product Advantages

　　1. Stable Long-Distance Transmission: Compared to IEPE voltage type, current output results in minimal cable voltage drop and interference, eliminating the need for repeaters in cross-regional cabling within large steam turbine rooms.

　　2. Intrinsically Safe Explosion-Proof Standard: The 143-103-000-502 Ex version possesses complete explosion-proof certification, allowing direct installation in high-risk areas such as natural gas compressors, refining units, and gas turbines.

　　3. Harsh Working Condition Protection: Metal-sealed corrugated conduit outlet, resistant to oil, water vapor, and dust, suitable for long-term 24/7 online monitoring.

　　4. Built-in Insulation and Interference Resistance: The sensor housing is isolated from the measurement circuit, ensuring no noise drift in vibration data under strong electromagnetic environments such as power plants and frequency converter rooms.

　　5. No External Signal Conditioning Required: Integrated circuitry simplifies monitoring system cabling and reduces intermediate connection failure points.

　　III. Typical Application Scenarios (Power/Petrochemical Core Equipment)

　　1. Vibration monitoring and shutdown protection interlocking for heavy-duty gas turbine and steam turbine bearing housings.

　　2. Condition monitoring for large reciprocating/centrifugal compressors and booster units.

　　3. Predictive maintenance for high-power fans, gearboxes, and pump sets.

　　4. Online monitoring of rotating machinery in explosion-proof areas such as oil refining, coal chemical, and LNG plants.

　　5. Vibration protection systems for steam turbine generator sets and feedwater pumps in power plants.

　　IV. Supporting System Configuration

　　Backend Data Acquisition: Vibro-Meter VM600, Meggitt VibroSmart, and various unit vibration protection devices.

　　Wiring: Two-core shielded twisted-pair cable, both lines supply power and transmit vibration current signals simultaneously.

　　V. Installation and Wiring Points

　　Installation Thread Standard: 1/4"-28 UNF, Tightening Torque 2.4 N·m

　　Two-wire connection: The power and signal lines share a shielded twisted pair cable, with the shield grounded at one end.

　　Back-end data acquisition: Must be used with a vibration rack with a current input channel (VM600 card dedicated channel); do not directly connect to the IEPE voltage input channel.

　　Installation requirements: The sensor base must be fully flush with the metal surface of the equipment, tightened to the specified torque, avoiding soft installation of the shims which reduces high-frequency response.

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