Product Overview

The 126623-01 is a specialized Aero GT I/O Module designed for the Bently Nevada 3500/44M Aeroderivative Gas Turbine Monitoring System. This module serves as the critical hardware interface between the monitor electronics and field-mounted transducers, including accelerometers and Velomitor velocity sensors. Engineered specifically for the unique high-frequency vibration characteristics of aeroderivative turbines, it ensures high-fidelity data acquisition for machinery protection and diagnostic analysis.

This specific configuration supports External Terminations, allowing for flexible wiring layouts and easier maintenance in complex industrial environments. By providing buffered transducer outputs and precision signal conditioning, the 3500/44-02-00 enables operators to track 1X vibration components and band-pass filtered data with extreme accuracy, preventing catastrophic engine failure through real-time machinery protection.

Key Technical Characteristics

• Aeroderivative Optimization: Tailored for high-speed gas turbines with machine speeds ranging from 60 to 240,000 cpm, utilizing 6-pole rolloff filters for sharp signal attenuation.

• Multi-Channel Versatility: Supports up to four independent channels, accepting inputs from velocity transducers, accelerometers, and integrated Velomitor sensors.

• Advanced Filtering Logic: Features user-configurable Constant Q filters (3 or 5 Hz bandwidth) and 22 selectable operating speeds from 2,400 to 18,000 RPM for precise tracking.

• Dual Keyphasor Support: Accepts two separate Keyphasor inputs, providing the necessary timing reference for accurate phase and speed tracking across the turbine's operating range.

• High-Speed Data Processing: Maintains an update rate of 100 ms or less, ensuring that alarm logic for Alert and Danger setpoints responds instantly to transient vibration events.

• Robust Signal Integrity: Buffered outputs include short-circuit protection, while recorder outputs provide proportional signals for external DCS or PLC integration with high resolution (0.3662 µA per bit).

Technical Specifications

• Manufacturer: Bently Nevada (Baker Hughes)

• Model Number: 3500/44-02-00

• Order Number: 126623-01

• Input Impedance: >95 kΩ (Aero GT); 3.5 MΩ (Velomitor)

• Power Consumption: 7.7 Watts (Typical)

• Frequency Response: 4 Hz to 30 kHz (-3 dB)

• Transducer Power: -23 Vdc nominal

• Operating Temperature: -30°C to +65°C (-22°F to +150°F)

• Accuracy: Within ±0.33% of full-scale (Typical)

• Physical Dimensions: 24cm x 24cm x 9cm

• Weight: 0.45 kg (1.0 lb)

Industrial Applications

• Aviation-Derived Gas Turbines: Monitoring vibration levels on GE LM series, Rolls-Royce, and Pratt & Whitney industrial turbine units.

• High-Speed Compressors: Providing axial and radial vibration data for high-performance compression trains in the oil and gas sector.

• Power Generation: Serving as a primary TSI (Turbine Supervisory Instrumentation) component for rapid-start peak-load power plants.

• Predictive Maintenance: Supplying real-time spectral data to Bently Nevada System 1 software for early detection of bearing fatigue and rotor imbalance.