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　　The 143-103-000-642 is a piezoelectric dynamic pressure sensor specifically developed for monitoring pulsating pressure (combustion oscillation/thermoacoustic oscillation) in gas turbine combustors. It only measures alternating dynamic pressure and cannot measure static pressure. It is a charge output type and must be used with the charge amplifier IPC704.

　　Manufacturer: Vibro-Meter (now part of Meggitt Sensors). It is widely used in GE's Mark VIe heavy-duty gas turbine control system and is a standard sensor for dynamic pressure in the low-NOx combustor of gas turbines.

　　Key Technical Parameters

　　Sensitivity: 232 pC/bar (16 pC/psi), tolerance ±5%

　　Frequency Range: 2 Hz ~ 10000 Hz

　　Continuous Operating Temperature: -54 ℃ ~ 650 ℃

　　Short-Time Limit Temperature: Maximum 700℃

　　Dynamic Measurement Range: 0.00004 ~ 20 bar

　　Shock Overload Withstand: Instantaneous peak 250 bar

　　Linearity: ±1%FS

　　Acceleration Sensitivity: ≤0.05 pC/g (anti-vibration interference, patented acceleration compensation structure)

　　Resonant Frequency: >50 kHz

　　Output Type: Two-wire charge signal, passive, no sensor-side power supply required

　　Cable: Integrated mineral-insulated MI high-temperature armored cable; LEMO connector/high-temperature dedicated connector optional at the end

　　Material: Inconel 600 alloy, high temperature resistant, resistant to flue gas corrosion

　　Explosion-proof: Equipped with ATEX Explosion-proof certified, suitable for hazardous areas.

　　Typical component chain: 143-103-000-642 (charge output) → IPC704 charge conditioner → Mark VIe / vibration acquisition system. The IPC704 converts the charge signal into a 4–20mA current or voltage signal, which is then sent to the control system.

　　Key Usage Precautions

　　Piezoelectric Sensor Inherent Characteristics: Cannot measure static pressure! Static pressure readings are unavailable when the machine is stopped; only pressure fluctuations are captured.

　　The cable is a MI mineral-insulated high-temperature cable; arbitrary lengthening is strictly prohibited. The charge signal is highly susceptible to interference, requiring extremely strict wiring specifications.

　　High-Temperature Installation: The sensor body cannot be additionally water-cooled; the mounting threads must be high-temperature resistant and sealed.

　　Common Ordering Part Number Example: 143-103-000-931 (Standard model, cable length customized according to project)

　　Comparison Reference within the Same Series:

　　143-103-000-642 : 232 pC/bar, 0–10 kHz, 650℃ (Mainstream model for general-purpose gas turbine combustion chambers)

　　CP211: 25 pC/bar, upper limit 15 kHz (High dynamic range, low sensitivity)

　　CP235: 750 pC/bar, high sensitivity, maximum 520℃

　　Common Fault Diagnosis Experience:

　　No Signal: Check IPC704 Power supply issues, damaged cable insulation, and moisture-induced leakage at joints (charge sensors are most vulnerable to insulation degradation).

　　High signal noise: Grounding loops, cable crushing damage, and high-temperature aging of the sensor body causing leakage.

　　Sensitivity drift: Long-term operation above the rated temperature causes piezoelectric crystal performance degradation, requiring factory calibration.

　　Vibro-Meter 143-103-000-642 Pressure Sensor Typical Engineering Application Cases

　　Case 1: GE 9FA DLN2.6 Combined Cycle Power Plant (Most common field application in China)

　　Project Overview: 3×9FA heavy-duty gas turbines + steam combined cycle, DLN dry-type low-NOx combustors; each gas turbine has 6 combustors, each equipped with  143-103-000-642, forming a combustor dynamic pressure monitoring system (CDM).

　　System Architecture: 143-103-000-642 (integrated MI mineral-insulated high-temperature armored cable) → IPC704 signal conditioner → Mark VIe control system PTUR vibration I/O package.

　　Monitoring Objectives

　　Real-time capture of 80–500Hz thermoacoustic oscillation pressure pulsations;

　　Identification of combustion instability under low load and natural gas/hydrogen blending conditions;

　　Triggering alarms when pulsation amplitude exceeds limits, guiding DLN fuel blending optimization;

　　Preventing fatigue cracks in the flame tube and transition section caused by high-intensity oscillations.

　　Key Points for On-Site Implementation

　　Threaded flanges are directly installed in the combustion chamber shell's measuring holes, without water cooling, and can withstand long-term wall temperatures of approximately 600℃;

　　LEMO connectors are placed outside the insulation layer to avoid high-temperature baking of the connectors;

　　MI cables must not be cut or inter-connected (charge signals are highly susceptible to leakage).

　　Typical Fault Scenario (Operational and Maintenance Example): During deep peak shaving of the unit, combustion pulsations continuously increase, identified as circumferential oscillations by 143-103-000-642 spectrum data; after adjusting the fuel grading ratio, the oscillation amplitude decreases, preventing unplanned shutdowns.

　　Case 2: GE 7FA.05 DLN2.5 Distributed Energy Power Station

　　Operating Characteristics: Frequent start-stop cycles, deep day-night peak shaving, large fuel quality fluctuations, and a high susceptibility to intermittent combustion oscillations.

　　143-103-000-642  Function: To compare vibration probe signals and distinguish between "mechanical vibration noise" and "actual combustion pulsation" (143-103-000-642 has low acceleration sensitivity ≤0.05 pC/g and advantages in resisting shell vibration interference).

　　Solution Highlights:

　　143-103-000-642  + flame detector are configured in the same cylinder; pressure pulsation and light intensity signals are used together to determine flameout precursors; Mark VIe protection logic is incorporated to suppress oscillation amplification.

　　Case 3: Gas Turbine Complete Unit Test Bench (OEM/Research Institute)

　　Application Scenarios: Durability testing of gas turbine combustion chamber components, fuel adaptability testing (natural gas, hydrogen blending, LNG).

　　Measurement Point Layout

　　4-8 143-103-000-642 probes are evenly distributed around the circumference of the annular combustion chamber to simultaneously acquire dynamic pressure time-domain and spectrum data. The signals are sent to a high-speed acquisition system for analysis:

　　Axial and circumferential modal oscillation frequencies;

　　The impact of equivalence ratio changes on thermoacoustic instability;

　　Comparison of vibration suppression effects of the new nozzle structure.

　　Selection Rationale

　　2-10kHz wideband, long-term temperature resistance up to 650℃, high sensitivity of 232 pC/bar, suitable for long-term continuous testing in the laboratory.

　　Case Study 4: GE LM6000 Aero-derived Gas Turbine in an Overseas LNG Power Plant

　　Operating Conditions: Aero-derived gas turbine, LNG vaporized gas as fuel, rapid load fluctuations.

　　Purpose: Continuously monitor the pulsating pressure of the annular combustion chamber as a basis for dynamic feedforward control of the fuel valve; suppress oscillations in advance, balancing low NOx emissions and combustion stability. The control system uses a Mark VIe Lite, directly connected to the 4–20mA signal converted by the IPC704. Case 5: Retrofit Project: Installing a CDM System on an Aging 9E Gas Turbine

　　Background: Early 9E units lacked dynamic combustion monitoring, resulting in repeated instances of flame tube thermal fatigue damage; online monitoring was added.

　　Retrofit Solution: A 143-103-000-642 sensor was installed through an opening, and an IPC704 terminal box was added. The signal was connected to the existing Mark VIe control system, eliminating the need to replace the main controller.

　　Benefits: Combustion chamber component damage risks can be predicted before major overhauls, optimizing maintenance cycles.

　　Comparison of Similar Sensors (Project Selection Reference)

　　143-103-000-642 : 232 pC/bar, 2–10kHz, long-term 650℃ → Standard configuration for mainstream heavy-duty F-class gas turbines

　　CP211: 25 pC/bar, higher frequency, lower sensitivity → Strong pulsation conditions

　　CP235: 750 pC/bar, ultra-high sensitivity, upper limit 520℃ → Precision testing for weak oscillations

　　General Engineering Considerations (Common to all cases)

　　Piezoelectric principle cannot measure static pressure; no DC output during shutdown is normal.

　　MI high-temperature cables cannot be arbitrarily lengthened, and ordinary junction boxes cannot be used in the middle.

　　The insulation requirements for the entire circuit are extremely high; moisture and carbon buildup at the joints will cause noise drift.

　　IPC704 must be used with 143-103-000-642 ; IEPE type sensor acquisition modules cannot be used interchangeably.

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