Many products have not yet been listed online; please contact us for more information.

　　If the product model differs from the displayed image, the model number takes precedence. Please contact us for specific product photos; we can arrange for warehouse staff to take and verify images.

　　We operate 76 shared warehouses globally, so it may sometimes take a few hours to provide an accurate response; we appreciate your understanding. Rest assured, we will address your inquiries as quickly as possible.

　　CP21X 143-216-000-011 Alternative Names:

　　Vibration Meter CP21X 143-216-000-011

　　CP21X 143-216-000-011 High-Temperature Piezoelectric Dynamic Pressure Sensor

　　The CP21X 143-216-000-011 Vibro-Meter (Meggitt) high-temperature piezoelectric dynamic pressure sensor is designed for long-term online monitoring and testing of pulsating pressure and combustion instability in turbine combustion chambers. The sensor utilizes a VC2 single-crystal piezoelectric sensing element and features a two-wire charge-output structure. It pairs with IPC704/IPC707 charge amplifiers to convert picocoulomb-level charge signals into standard voltage or current signals for integration into data acquisition and unit monitoring systems. This model features an integrated mineral-insulated (MI) high-temperature cable and holds Ex ib intrinsic safety certification, ensuring stable, long-term operation under hazardous conditions involving high temperatures, vibration, and strong electromagnetic interference.

　　II. Working Principle

　　This sensor measures dynamic pressure based on the direct piezoelectric effect: when the VC2 single-crystal piezoelectric material is subjected to mechanical stress, polarization occurs within the crystal lattice, generating a charge output on the material's upper and lower surfaces that is proportional to the amount of strain. The pressure of the medium acts upon the sensing diaphragm at the front of the sensor, transferring the pressure load to the internal piezoelectric crystal, where pressure fluctuations are converted into compressive stress within the crystal;

　　Compression of the crystal generates an electrical charge, the magnitude of which is linearly proportional to the amplitude of the dynamic pressure variation; the sensor responds only to changes in pressure and cannot measure static, constant pressure;

　　The minute charge generated—measured in picocoulombs (pC)—is transmitted via an integrated mineral-insulated (MI) high-temperature cable to a downstream charge amplifier;

　　The charge amplifier performs impedance transformation, amplification, and filtering on the high-impedance charge signal, outputting a standard voltage or current signal to data acquisition and unit condition monitoring systems for the analysis of pressure pulsation spectra, amplitudes, and combustion oscillation characteristics.

　　Key structural features: Compression-mode crystal configuration and an internally insulated housing design; the sensor’s natural resonant frequency is 80 kHz—well above the upper limit of the operating bandwidth—ensuring stable phase and amplitude response within the 2 Hz to 15 kHz measurement range; acceleration sensitivity is ≤0.0625 pC/g, significantly minimizing measurement crosstalk errors caused by housing vibration.

　　III. Core Technical Advantages

　　Ultra-wide high-temperature operating range: Operates between -54°C and +650°C; can be mounted directly in the gas turbine combustion chamber zone to withstand high-temperature environments, meeting long-term online combustion pulsation monitoring requirements for heavy-duty and aero-derivative gas turbines; the low-temperature range also allows for pulsation testing in cryogenic media.

　　Excellent frequency response characteristics: Nominal frequency response of 2 Hz to 15 kHz (±5%), covering the full spectrum of combustion oscillations from low to high frequencies; capable of capturing broadband dynamic pressure signals such as thermoacoustic oscillations, combustion surges, combustion chamber pressure pulsations, and turbulent disturbances; high resonant frequency of 80 kHz ensures strong resistance to high-frequency shock interference. Stable Piezoelectric Single-Crystal Sensing Element: Utilizes VC2 single-crystal piezoelectric material. Compared to standard piezoelectric ceramics, it offers minimal sensitivity drift at high temperatures, low long-term creep, and excellent temporal stability, making it suitable for years of continuous online monitoring. Sensitivity is fixed at 25 pC/bar. It features a dynamic range of 0.0005–250 bar and withstands short-term overloads up to 350 bar, including instantaneous pressure spikes during combustion.

　　Low Vibration Crosstalk: Acceleration sensitivity is ≤0.0625 pC/g. In environments with strong turbine base vibrations, it significantly reduces interference from mechanical vibration coupling into the pressure measurement channel, ensuring the reliability and accuracy of the pressure pulsation spectrum.

　　Integrated Mineral-Insulated (MI) High-Temperature Cable: The cable is integrally packaged with the sensor body. It is resistant to high temperatures, radiation, and oil contamination, making it suitable for high-temperature installation routes. The termination offers options for a LEMO connector or a Vibro-Meter proprietary high-temperature connector, ensuring compatibility with charge amplifier wiring.

　　Ex ib Intrinsically Safe Certification: Holds ATEX explosion-proof certification, allowing for installation and use in hazardous areas containing explosive gases—such as those found in oil and gas, chemical processing, and power plants—while meeting safety standards for gas turbines and offshore platform equipment.

　　Compact Structure and Flexible Installation: The sensor body is small and lightweight, fitting into the confined spaces of combustion chamber pressure ports. It supports various mounting adapters, is compatible with OEM pressure interfaces, and is suitable for both retrofit installations and new equipment integration.

　　Note: This sensor features a charge output and must be paired with a dedicated charge amplifier; it cannot be connected directly to standard voltage acquisition modules. It measures only dynamic pressure pulsations and is not suitable for steady-state static pressure measurement. 4. Typical Application Areas

　　1) Gas Turbines (Core Application)

　　Online monitoring of combustion dynamics in the combustors of heavy-duty industrial gas turbines and aero-derivative gas turbines to detect thermoacoustic oscillations, combustion instability, and combustion surge;

　　Spectral analysis of combustor pressure pulsations to identify low-frequency combustion oscillations and high-frequency turbulent noise, guiding fuel ratio adjustments and burner optimization to prevent thermal-acoustic resonance from damaging combustor components;

　　Bench testing for new engine development, combustor performance testing, and comparative testing of combustion stability before and after unit retrofitting.

　　2) Turbomachinery and Power Equipment Testing

　　Internal dynamic pressure pulsation testing for steam turbines and compressors;

　　Dynamic pressure data acquisition for engine combustion test rigs and pulse combustion devices;

　　Pressure shock and pulsating load testing during component fatigue tests.

　　3) Oil & Gas, Power Generation, and Marine Propulsion

　　Long-term monitoring of combustion status for gas turbines on offshore platforms and distributed energy units;

　　Combustion pulsation monitoring for marine gas turbine propulsion systems;

　　Dynamic pressure monitoring for combustion devices and industrial burners in the petrochemical industry.

　　4) Fault Diagnosis and Unit Protection

　　Real-time monitoring of combustor pressure pulsation amplitude and frequency spectra to provide early warnings of combustion oscillations, flashback, and flameout precursors;

　　Integration with the Vibro-Meter VM600 condition monitoring system to enable alarms for combustion anomalies and equipment protection, thereby reducing the risk of unplanned shutdowns caused by damage to combustors and hot-gas path components.

Recommended related products:
143-211-000-122
143-211-000-301
143-211-000-142
143-211-000-082
143-113-000-751
143-113-000-71
143-113-000-542
143-211-000-172
143-211-000-311
143-211-000-112
143-211-000-072
143-211-000-032
143-113-000-911
More......