144-202-000-135 Piezoelectric Accelerometer VIBRO-METERPLC Dragon Automation

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144-202-000-135 Piezoelectric Accelerometer VIBRO-METER

Internally, it uses quartz crystal or piezoelectric ceramic as the sensing element. When the sensor vibrates with the object being measured, the inertial mass applies a periodic force to the piezoelectric element. Due to mechanical stress, the piezoelectric element generates a charge signal proportional to the acceleration, thus achieving accurate measurement of vibration acceleration. The "20" in CA20X usually represents its nominal charge sensitivity of approximately 20 picocoulombs per second of gravitational acceleration, which is a medium sensitivity specification, balancing measurement range and resolution, and suitable for vibration monitoring scenarios in general industrial equipment. Judging from its structural form, CA20X most likely adopts a triangular shear type structure. The piezoelectric element is clamped to the central pillar of the triangle by a clamping ring. When sensing axial vibration, the piezoelectric element bears shear stress. This structure has excellent isolation effect on base deformation and temperature changes, and has a high resonant frequency and good linearity.

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　　The 144-202-000-135 piezoelectric accelerometer is an industrial-grade piezoelectric vibration sensor manufactured by VIBRO-METER, a Swiss company. Founded in 1952 and headquartered in Fribourg, Switzerland, VIBRO-METER is a professional manufacturer in the field of rotating machinery protection and condition monitoring. Its products are widely used in industries such as power, petrochemical, and aerospace. It has provided engine vibration monitoring systems for large commercial aircraft such as Boeing, McDonnell Douglas, and Airbus, and has accumulated over thirty years of R&D and manufacturing experience in the field of piezoelectric accelerometers.

　　The 144-202-000-135 belongs to VIBRO-METER's CA series piezoelectric accelerometer product line. This series of sensors operates based on the piezoelectric effect, using quartz crystals or piezoelectric ceramics as sensing elements. When the sensor vibrates with the object being measured, the inertial mass applies a periodic force to the piezoelectric element. The piezoelectric element generates a charge signal proportional to the acceleration due to mechanical stress, thus achieving accurate measurement of vibration acceleration. The "20" in 1144-202-000-135typically indicates a nominal charge sensitivity of approximately 20 picocoulombs per second of gravitational acceleration, a medium sensitivity specification that balances measurement range and resolution, suitable for vibration monitoring in general industrial equipment. Structurally, the 1144-202-000-135likely employs a triangular shear structure, with the piezoelectric element clamped to the central pillar of the triangle by a clamping ring. When sensing axial vibration, the piezoelectric element bears shear stress. This structure provides excellent isolation from base deformation and temperature changes, exhibiting a high resonant frequency and good linearity.

　　Regarding key performance parameters, the 144-202-000-135 typically operates within a frequency range of 0.5 Hz to 10 kHz. In practical use, the frequency is generally one-third of the resonant frequency to ensure measurement accuracy. Its installation resonant frequency, when bolted, can reach 28 kHz to 31 kHz. The measurement range is typically between ±50g and ±500g; higher sensitivity results in a smaller measurable range. Lateral sensitivity is generally less than 3% of the main sensitivity. The operating temperature range is typically -40°C to ±120°C. Output options include charge output and IEPE integrated piezoelectric output. The IEPE type incorporates a built-in MOSFET preamplifier, powered by a 2-20 mA constant current source, and outputs a low-impedance voltage signal with strong anti-interference capabilities. With VIBRO-METER's proprietary low-noise cable, signal transmission up to 1000 meters without attenuation can be achieved.

　　The 144-202-000-135 is widely used in industrial equipment condition monitoring and fault diagnosis, including vibration monitoring of rotating machinery such as motors, pumps, compressors, fans, and gearboxes. It is used to diagnose faults such as bearing wear, imbalance, misalignment, and breakage. It is also used in online vibration monitoring and protection systems for critical equipment in large power plant turbine units and petrochemical plants, and can perform vibration assessments according to international standards such as DIN45665 and DIN ISO 10816. In the aerospace field, VIBRO-METER's piezoelectric accelerometers have been installed in the engine monitoring systems of civil aircraft such as the Airbus A330, A340, McDonnell Douglas MD-11, and Boeing 737.

　　For installation, 144-202-000-135 recommends using steel bolts for fixing, as this is the best method to achieve the factory-specified resonant frequency. The installation torque is approximately 1.5 to 2.0 Nm for M3 threads and approximately 8 to 10 Nm for M5 threads. Bolts should not be fully screwed into the base bolt holes to avoid base deformation. Magnetic, adhesive, or handheld probes can also be used, but these methods will reduce the effective frequency response to varying degrees. The sensor mass should not exceed one-tenth of the dynamic mass of the measured vibrating part to avoid additional mass effects altering the original vibration characteristics. When using a piezoelectric accelerometer, note that it is a generator-type sensor with extremely high output impedance. It must be used with a high input impedance charge amplifier or IEPE constant current source. The transmission cable should be a low-noise, double-shielded cable, and the initial section of the cable should be fixed to the measured object to eliminate triboelectric effects.

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