GE Honeywell L44723P01 Turbine Pressure Transducer Sensor

GE Honeywell L44723P01 Turbine Dynamic Pressure Transducer Sensor

The GE Honeywell L44723P01 is a high accuracy heavy duty dynamic pressure transducer sensor specifically designed for demanding aeroderivative and heavy duty gas turbine applications. The L44723P01 is a real-time combustion dynamics, compressor discharge pressures (P3) and fuel gas manifold pressure monitor designed to work successfully in severe vibration, rapid temperature cycling and high acoustic noise profiles.

This transducer features a hermetically sealed, corrosion resistant 316L stainless steel shell and piezoresistive sensing element for high frequency response and outstanding long term stability. It interacts directly with GE Speedtronic™ Mark V, Mark VI and Mark VIe control systems and with Honeywell Experion PKS and Woodward MicroNet platforms to give the precise pressure feedback required for surge protection, flameout monitoring and low-NOx combustion stability.

Model Details

• Manufacturer: General Electric (GE) / Honeywell Sensing & Control
• Model Number: L44723P01
• MPN: L44723P01
• OEM Designation: Sensor, Dynamic Pressure / Pressure Transducer Assembly
• Sensing Technology: Piezoresistive / Strain Gauge on Stainless Steel Diaphragm
• Enclosure Rating: IP67 / NEMA 4X Hermetically Sealed stainless steel housing

Key Features

• High Dynamic Frequency Response: Capable of detecting acoustic pulsations and pressure oscillations up to 5 kHz for early combustion instability detection.
• Ruggedized Industrial Design: Hermetically sealed 316L stainless steel body engineered to endure extreme engine bay vibration (up to 30g RMS) and fluid exposure.
• Wide Thermal Operating Range: Fully temperature-compensated from -40°C to +125°C (-40°F to +257°F) with minimal thermal zero shift.
• Standardized Industrial Interface: 2-wire 4–20 mA current loop output (or differential mV signal depending on signal conditioning module) with 1/4″-18 NPT or autoclave pressure porting.
• Plug-and-Play Integration: Directly pin-compatible with GE LM-series aeroderivative gas turbine wiring harnesses and junction boxes.

Part Number Cross-References

• GE OEM Part Number: L44723P01
• Honeywell OEM Part Number: L44723P01 / 30010044-001
• GE Energy / Speedtronic Catalog Reference: GE-L44723P01
• Cross-industry Equivalent: 112M34P01, 362A1048P001 (Verification against specific serial number required)

Equipment Compatibility

The GE Honeywell L44723P01 is qualified for marine propulsion, offshore oil & gas mechanical drive packages, and onshore power generation installations utilizing the following equipment:

• GE Aeroderivative Gas Turbines: LM2500, LM2500+, LM5000, LM6000, and TM2500 mobile sets.
• Control Systems: GE Mark V, Mark VI, Mark VIe Speedtronic Control Panels, Honeywell Experion PKS, Woodward MicroNet TMR.
• Marine Applications: Naval main propulsion turbines, commercial fast ferry boost turbines, floating production storage and offloading (FPSO) gas compression driver modules.

Applications

• Combustion Dynamics Monitoring: Detecting pressure oscillations and thermoacoustic instabilities inside Dry Low Emissions (DLE) or Single Annular Combustor (SAC) systems.
• Compressor Discharge Pressure (P3) Sensing: Providing continuous pressure monitoring at the high-pressure compressor exit to optimize fuel metering ratios.
• Fuel Gas & Liquid Fuel Manifold Pressure: Tracking dynamic fuel line pressure pulsations to prevent injector cavitation and uneven fuel distribution.
• Turbine Air Extraction Systems: Monitoring cooling and sealing air pressure lines across high-pressure (HP) and low-pressure (LP) turbine stages.

From the Desk of a Senior Marine Systems Engineer:

When retrofitting or replacing the L44723P01 dynamic pressure transducer on an LM2500 or LM6000 package aboard a vessel or offshore platform, cold-end dynamic pressure spikes are the leading cause of premature diaphragm fatigue. Follow these field-tested procedures to maximize operational life and prevent false trip signals:

Professional Installation Procedures

• Impulse Line Purging & Heat Isolation: Always clear the impulse line of liquid condensate, heavy hydrocarbon residues, or particulate before threading the sensor into the port. Ensure the acoustic isolation tube / snubber is installed if operating on high-temperature combustion casings to keep ambient temperatures at the sensor head below 100°C.
• Torque Specifications & Thread Sealing: Torque the 1/4″ NPT process connection to 25–30 Nm (18.5–22 ft-lbs) using a backup wrench on the sensor hex flats. Never apply torque to the main sensor canister or electrical connector body. Use high-temperature nickel-based anti-seize or PTFE tape sparingly—starting two threads back from the tip—to avoid clogging the internal diaphragm orifice.
• Wiring & Shielding Continuity: Connect the MIL-connector with hand-tightness plus 1/4 turn engagement. Ensure signal cable shielding is grounded at the control cabinet end only to avoid ground loops caused by hull-potential variations on marine vessels.
• Zero-Point Verification: Perform a static 0 bar ambient pressure check prior to firing the engine. Current signal output must register exactly 4.00 mA (±0.08 mA) across terminals A and B. Any reading exceeding 4.15 mA indicates diaphragm distortion or mechanical stress caused by over-torquing.

Frequently Asked Questions

What are the primary symptoms of a failing L44723P01 transducer on an LM2500 gas turbine?

Failing transducer typically manifests as erratic pressure spikes on the Mark VIe control console, high acoustic vibration false alarms during startup, signal drift away from the 4.00 mA baseline at zero pressure, or open-loop fault codes due to internal coil/strain gauge degradation.

Can the GE Honeywell L44723P01 pressure transducer be calibrated in the field?

While fine zero and span adjustments can be trimmed in the control panel software, physical sensor calibration requires a deadweight tester or precision pressure calibrator with 0.05% accuracy. If the sensor zero shift exceeds ±2% FS, the unit must be bench-recalibrated or replaced.

Is the L44723P01 suitable for high-temperature exhaust monitoring?

The sensor is temperature-compensated up to +125°C at the housing. For direct exhaust gas or flame-zone pressure monitoring where temperatures exceed this limit, an impulse stand-off pipe or cooling coil adapter must be used to dissipate heat before it reaches the transducer diaphragm.

How does the L44723P01 handle explosive gas atmospheres in offshore marine enclosures?

The L44723P01 features ATEX/IECEx intrinsically safe and explosion-proof ratings. When wired through an approved galvanic isolation barrier (such as a Pepperl+Fuchs or MTL barrier) in accordance with Class I Div 1 / Zone 1 guidelines, it is fully certified for hazardous marine engine rooms and gas compressor modules.