CP235 143-235-000-012

CP235 143-235-000-012 is a Meggitt Vibra-meter piezoelectric pressure sensor with charge output, specially designed for measuring high-temperature dynamic pressure pulsation and not suitable for static pressure measurement. Built-in acceleration compensation and support for ATEX explosion-proof. It is necessary to collect signals in conjunction with a charge amplifier and use mineral insulated high-temperature armored cables. It is mainly applied to the monitoring of combustion oscillation and surge in the combustion chamber of industrial gas turbines and the dynamic pressure test of power equipment. The product is anti-vibration and stable, and it is a mature accessory for gas turbine Oems. When in use, strictly control the installation torque, cable bending and heat conduction. It is recommended to calibrate regularly.

PRECAUTIONS FOR USE

1. The signal and the supporting hardware CP235 143-235-000-012 is a charge output sensor and cannot be directly connected to a common voltage acquisition card. It must be equipped with a charge amplifier. IPC704 is recommended. The charge amplifier should be placed as close as possible to the sensor to reduce the capacitive noise and signal attenuation caused by long cables. Use dedicated low-noise high-temperature MI cables, and the cables cannot be replaced with ordinary shielded wires at will. The bending radius of the cable must strictly comply with the manual. Excessive bending of mineral insulated armored cables can damage the internal insulation layer. The charge signal is a high-impedance signal. Proper shielding grounding and single-point grounding should be carried out to avoid the introduction of interference noise by ground loops.

2. The maximum continuous temperature of the CP235 143-235-000-012 sensor head during installation should be 520℃, and the temperature at the connector end must not exceed the standard. When installing, pay attention to heat conduction isolation. If necessary, add heat dissipation gaskets to prevent high-temperature conduction from burning out the connector. The torque for threaded installation must strictly follow the datasheet specifications. Do not over-tighten to prevent damage to the internal piezoelectric crystal due to compression. It is recommended to use the matching high-temperature sealing parts. The sensing diaphragm must not be knocked or scratched. Damage to the diaphragm will directly change the sensitivity and cause measurement deviations.

3. Pressure usage restrictions:

Only measure dynamic pressure pulsation. The superimposed static back pressure is recommended to be ≤20bar. The static pressure must not exceed this value; otherwise, it will cause preload drift. Although the short-term peak overload can reach 100bar, it cannot withstand high pressure continuously for a long time. Frequent over-range impact pressure will permanently damage the piezoelectric element.

4. Vibration and Environment:

Although CP235 143-235-000-012 comes with built-in acceleration compensation, extremely large impacts and violent collisions can still cause damage to the crystal pre-tightening structure. The installation location should avoid extreme impact areas as much as possible. ATEX explosion-proof version: In hazardous areas

Core Functions

1. Measurement principle: Based on the piezoelectric effect, pressure acting on the piezoelectric crystal generates a charge signal proportional to the dynamic pressure. It is necessary to use an external charge amplifier, such as IPC704, to convert the high-resistance charge signal into a voltage/current signal for collection.

2. Dynamic pressure pulsation collection: Capture the tiny pressure fluctuations superimposed on the static back pressure; Dynamic measurement range: 0.00005 to 5 bar; The peak overload can reach up to 100 Barvibra-mete... .

3. Frequency response coverage: Frequency response 2 Hz to 10 kHz, natural resonance frequency 55 kHz, suitable for medium and high-frequency dynamic pressure measurement of gas turbine combustion oscillation, pressure pulsation, combustion noise, etc. Vibro-Mete... .

4. Acceleration compensation: Built-in acceleration compensation structure significantly reduces measurement interference caused by shell vibration (vibration sensitivity ≤0.15-0.375 pC/g), ensuring measurement accuracy even on strong vibration equipment. Vibra-mete... .

5. Explosion-proof environment measurement: Equipped with ATEX explosion-proof certification (Ex ia/Ex ib/Ex nA), it can be used for a long time in explosive hazardous areas. Vibra-mete... .

6. Wide temperature range measurement: The operating temperature of the sensor body is -55℃ to +520℃, and it can be exposed to high-temperature gas environments for a long time. It is equipped with an integrated mineral insulated MI high-temperature cable, which can withstand high temperatures. Different cable lengths are available for selection, and high-temperature connectors are used for output.

7. Linear measurement: The linearity within the dynamic range is ≤±1%, making it suitable for quantitative analysis of pressure pulsation in the engine combustion chamber.

Typical application scenarios

1. Monitoring of combustion oscillation and combustion instability in the combustion chamber of industrial gas turbines; Pressure pulsation test during the start-up, shutdown and variable load processes of gas turbines; Long-term online combustion dynamic monitoring of gas turbine OEM units (143-235-000-012 is the standard order model for gas turbines).

2. Aviation/ground gas engine test bench:

Dynamic pressure in the combustion chamber, combustion noise, and detonation pulsation tests.

3. Compressors and turbine equipment:

Dynamic pressure monitoring for pressure pulsation and surge precursors in high-pressure compressor pipelines.

4. Power equipment R&D and testing:

Dynamic pressure tests for burners, boilers, and injection devices, as well as transient pressure fluctuation tests.

5. Energy explosion-proof area:

Dynamic pressure pulsation monitoring in hazardous gas environments, which must comply with ATEX explosion-proof installation standards. Not applicable scenarios: Static pressure, slow steady-state pressure measurement; The piezoelectric charge signal will drift slowly through leakage and cannot measure constant static pressure.

DataSheet DownLoad