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　　The Vibro-Meter CE134 444-134-000-403 is a piezoelectric accelerometer (high-impedance vibration sensor) designed specifically for gas turbines, the nuclear industry, and other extreme environments. Manufactured by Vibro-Meter, a brand under Meggitt, this sensor is primarily used for long-term vibration monitoring, condition monitoring, and loose-part monitoring of mechanical equipment. Its core advantage lies in its use of a VC2 type single-crystal piezoelectric element, which maintains excellent signal stability and superior insulation resistance even at extremely high temperatures.

　　Key Technical Parameters

　　Temperature Range: Continuous operating temperature -54°C to +650°C, extreme environments withstand -196°C to +700°C (suitable for cryogenic to ultra-high temperature gas turbine environments).

　　Category Sensitivity: 10 pC/g ± 5% (at a reference frequency of 120 Hz).

　　Frequency Response: Nominal range 3 Hz to 2,800 Hz (up to 3,700 Hz in some versions or under specific test conditions).

　　Dynamic Measurement Range: 0.001 g to 200 g peak value.

　　Mount Resonance Frequency: > 17 kHz.

　　Shock Resistance: Withstands peak impacts up to 500 g (1 ms half-sine wave).

　　Housing Material: Typically made of Inconel 600 (Inconel nickel alloy), offering excellent resistance to high-temperature corrosion and moisture.

　　Pressure Insulation: Operates under pressures up to 140 bar (at 23°C).

　　System Operating Principle and Accessories

　　Differential Charge Output: The sensor itself does not have an amplifier circuit; it outputs a weak charge signal. It leads the signal out through a built-in rigid two-core mineral-insulated (MI) cable, providing strong electromagnetic interference (EMI) immunity.

　　Signal Conditioning: Requires an external charge amplifier (most commonly a Vibro-Meter IPC707 signal conditioner) to convert the charge signal into a standard industrial current (e.g., 4-20 mA) or voltage signal before inputting it to a monitoring system (e.g., VM600 or MMS6000).

　　Main Features

　　Charge Output: The sensor outputs an unamplified charge signal, typically requiring connection to an external charge amplifier/signal conditioner (e.g., IPC707 or related industrial conditioning board) via a two-core stainless steel rigid mineral-insulated (MI) cable to convert the charge signal into a standard current or voltage signal output.

　　Explosion-proof certification: Certified by ATEX/Ex and other relevant international standards, allowing safe application in hazardous industrial areas where explosive gases may be present (such as petrochemical and natural gas transportation).

　　Integrated mineral-insulated cable: Comes with a rigid mineral-insulated (MI) dual-core cable, typically terminated with a Lemo connector or Vibro-Meter's proprietary high-temperature connector to ensure signal transmission is protected from extreme external temperatures and strong electromagnetic interference.

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