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　　I. Product Positioning and Core Overview The 144-280-000-225 is a charge-output piezoelectric accelerometer designed specifically for extremely harsh industrial environments. It does not contain a built-in electronic amplifier (non-IEPE/ICP type), thus possessing extremely high high-temperature resistance. This sensor is mainly used for high-temperature, high-frequency vibration monitoring in gas turbines, steam turbines, aircraft engines, and large industrial pumps and fans.

　　II. Core Technical Parameters

　　1. Electrical and Sensitivity Characteristics Rated transfer ratio (sensitivity): 10 pC/g (picocoulombs/gravitational acceleration).

　　Capacitance: Approximately 100 pF (sensor itself).

　　Insulation resistance: Greater than 10^12 ohms at 20°C; greater than 10^9 ohms at the maximum operating temperature (260°C).

　　2. Measurement range and frequency response: Dynamic measurement range: 0.01 g to 200 g (peak).

　　Shock limit: Approximately 2000 g (single impact).

　　Linearity: Better than ±1% within the measurement range.

　　Frequency range: 1 Hz to 10,000 Hz (10 kHz), with a flat response curve within the specified frequency band.

　　Mount resonant frequency: Greater than 30 kHz (high resonance ensures accuracy in high-frequency vibration measurements and avoids signal distortion).

　　3. Environmental and physical characteristics: Operating temperature range: -55°C to +260°C (higher temperatures are possible for some special configurations or short-term tolerance, but 260°C is the upper limit for standard safe long-term operation).

　　Housing Material: 316L stainless steel (or equivalent corrosion-resistant, high-temperature-resistant aerospace-grade stainless steel), using a hermetically sealed laser welding process, typically achieving an IP68 protection rating.

　　Lateral Sensitivity: Less than 5% (effectively isolates interference vibrations from non-measuring axes).

　　Housing Isolation: The signal ground is completely insulated from the housing, effectively preventing ground loop interference in industrial environments.

　　III. Structure, Installation, and Connector Configuration

　　1. Structural Design: Internal Structure: Employs a shear-mode piezoelectric crystal structure. Compared to traditional compression designs, the shear-mode structure exhibits extremely low sensitivity to base strain and thermal transients, making it more stable when measuring on turbine housings subject to severe temperature fluctuations.

　　2. Pins and Connector: Connector Type: The tail typically uses a 7/16-27 UNS threaded connector (2 pins, with locking mechanism).

　　Pin Definitions:

　　Pin A: Positive signal (charge output +)

　　Pin B: Negative signal/return terminal (charge output -)

　　Casing: Shielding/Ground (completely isolated from internal A and B pins).

　　3. Physical and Mechanical Parameters: Mounting Thread: Standard is typically M6 × 1 or 1/4-28 UNF bolts.

　　Mounting Torque: Recommended 4.5 Nm to 5.5 Nm (excessive or insufficient torque will affect high-frequency response).

　　Weight: Approximately 60 to 80 grams (excluding cable).

　　IV. Signal Conditioning and System Compatibility: Because the 144-280-000-225 outputs a weak charge signal (pC), it cannot be directly connected to a standard voltage acquisition module or PLC.

　　It must be used with the following equipment:

　　Low-Noise Cable: Must use Vibro-Meter original or high-quality charge cables (such as the matching components for cable model 144-280-...). This type of cable has a special conductive layer inside to suppress the triboelectric effect caused by cable swaying.

　　Charge Amplifier/Preamplifier: Such as Vibro-Meter's IPC 704 or IPC 707 charge conditioner. The charge amplifier converts the pC signal to standard industrial voltage (such as 0-10V) or current signal (such as 4-20mA, off-the-shelf bus).

　　Monitoring Module: The final signal is sent to a mechanical condition monitoring system such as VM600 (such as the AMC4 module) or VibroSmart (VSV301).

　　V. Typical Application Areas

　　Gas Turbines and Steam Turbines: Monitoring bearing housing vibration and casing vibration. Aero-engine Testing: Vibration and shock data capture on R&D and factory test benches.

　　Large Industrial Pumps and Compressors: Continuous Condition Monitoring (CBM) for high-risk, high-temperature rotating machinery in the petrochemical and power industries.

　　High Vacuum and Nuclear Power Environments: Benefiting from its all-metal seal and lack of built-in electronic components, it exhibits extremely strong resistance to radiation and high vacuum environments.

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