128702-01 BENTLY Keyphasor I/O Module

Description 128702-01 BENTLY Keyphasor I/O Module Product Dimensions： Product Description (Detailed Explanation) The 128702-01 is a half-height I/O module that resides in the rear of the 3500 rack. Its primary role is to receive raw pulses from rotating shafts—usually one pulse per revolution—and provide that signal to the monitoring system. The “Keyphasor” signal is fundamental to machinery diagnostics; it provides a timing reference that allows the system to measure vector parameters (amplitude and phase), determine shaft rotational speed, and perform synchronous data sampling. Without this module, sophisticated vibration analysis (like orbit plots or Bode plots) would be impossible. Product Parameters (Technical Specifications) Parameter Category Specification System Compatibility Bently Nevada 3500 Series Module Type Enhanced Keyphasor I/O Module (Internal Terminations) Input Channels 2 Isolated Channels (supports up to 4 per 3500/25 system) Supported Sensors Proximity Probes, Magnetic Pickups, Multi-event wheels Signal Range 0.8V to -21.0V (Standard) Input Impedance 10 kΩ (Standard) Isolation 500V rms (Channel-to-Channel and Channel-to-System) Mounting Rear Rack Position (directly behind 3500/25 monitor) Operating Temp -30°C to 65°C (-22°F to 150°F) Product Advantages (Key Benefits) Phase Precision: Provides the highly accurate timing required to calculate the exact angular position of vibration peaks, essential for identifying rotor unbalance. Dual Channel Support: Each I/O module supports two separate Keyphasor inputs, allowing for redundant sensing or monitoring of multiple shafts (e.g., high-pressure and low-pressure turbine stages). Isolation & Protection: Galvanic isolation prevents ground loops and protects the internal rack electronics from field-side electrical surges. Synchronous Processing: Enables the 3500 system to filter vibration data to specific harmonics (1X, 2X, etc.) based on the actual rotational speed. Hot-Swappable: Can be replaced without shutting down the entire 3500 rack, ensuring maximum system availability. Precautions (Important Notes) I/O Slot Alignment: The 128702-01 must be installed in the rear slot that directly corresponds to the 3500/25 Monitor in the front. Misalignment will prevent the system from recognizing the inputs. Termination Resistors: Ensure that the input signal levels match the transducer type. Magnetic pickups and proximity probes have different voltage requirements. Wiring Integrity: Keyphasor signals are sensitive to noise. Use high-quality shielded twisted-pair (STP) cabling and ensure the shield is grounded only at the 3500 rack end. Configuration: Software configuration via the 3500 Rack Configuration Software is required to define the threshold voltage and hysteresis for the trigger pulse. Product Applications (Typical Use Cases) Turbine-Generator Sets: Providing phase reference for steam and gas turbines in power plants to detect shaft misalignment or unbalance. Large Compressors: Monitoring speed and vibration phase in centrifugal or axial compressors in oil and gas refineries. Pumps & Motors: High-speed boiler feed pumps or large induction motors where critical speeds and resonance must be monitored. Predictive Maintenance: Feeding data into System 1 software for advanced diagnostics, such as polar plots and shaft centerline analysis. Shipping Port: Xiamen, China Payment: Bank of Chicago, Bank of Singapore Express cooperation: fedex, DHL, UPS and your express account Service: Professional Sales provides 24 hours /7 days online service Please make an inquiry for more models： Bently 125720-01 BENTLY 21000-16-10-00-256-13-02 BENTLY 128229-01 BENTLY 3300/16 BENTLY 172323-01/172362-01 BENTLY 3300/20 BENTLY 19047-01 BENTLY 3300/36 BENTLY 3300/55-04-04-18-18-00-00-05-01 BENTLY 3300/40 BENTLY 330103-00-04-10-02-00 BENTLY 3300/45 Bently 330103-00-06-10-02-00 BENTLY 3300/47 BENTLY 330104-00-05-10-02-CN BENTLY 3300/48 BENTLY 330104-00-06-10-02-00 BENTLY 3300/55 BENTLY 330106-05-30-10-02-00 BENTLY 3300/61 BENTLY 330130-040-00-00 BENTLY 3300/65 BENTLY 330130-045-00-00 BENTLY 330101-00-48-10-02-05 BENTLY 330180-91-00 BENTLY 330103-00-03-05-02-05 BENTLY 330180-X0-05 BENTLY 330103-00-04-05-02-00 BENTLY 330500-02-00 BENTLY 330103-00-04-10-02-00 BENTLY 33A3BEPM-W4 BENTLY 330103-00-05-10-02-00 BENTLY 33A3BEPM-Z2 BENTLY 330103-00-06-10-02-00 BENTLY 3500/22-01-01-01 BENTLY 330103-00-08-10-02-00 BENTLY 3500/22M BENTLY 330103-00-15-10-02-00 BENTLY 3500/22M BENTLY 330104-00-04-10-02-00 Bently 3500/32 BENTLY 330104-00-06-10-02-00 BENTLY 3500/42M BENTLY 330104-00-08-10-02-00 BENTLY 3500/45-01-00 BENTLY 330104-00-15-10-02-05 BENTLY 3500/53-03-00 BENTLY 330104-00-15-10-02-CN BENTLY 3500/53-03-00 BENTLY 330104-05-10-10-02-CN BENTLY 3500/92 BENTLY 330104-08-16-05-02-05 BENTLY 3500/94 BENTLY 330105-02-12-10-02-00 BENTLY 3503E BENTLY 330105-02-12-10-02-05 BENTLY 369-HI-R-0-0-0-0 BENTLY 330106-05-30-05-02-00 BENTLY 125720-01 BENTLY 330106-05-30-10-02-00 BENTLY 125760-01 BENTLY 330130-040-00-00 BENTLY 125768-01 BENTLY 330130-040-00-CN BENTLY 125800-01 BENTLY 330130-040-01-00 BENTLY 125800-01125768-01 BENTLY 330130-040-01-05 BENTLY 125800-013500/25149369-0 BENTLY 330130-040-02-00 BENTLY 125840-01 BENTLY 330130-045-00-00 BENTLY 128229-01 BENTLY 330130-080-00-00 BENTLY 128229-0195 BENTLY 330130-085-00-05 BENTLY 133323-01 BENTLY 330180-50-00 BENTLY 133396-01 BENTLY 330180-51-00 BENTLY 133442-01 BENTLY 330180-51-05 BENTLY 133442-013500/50 BENTLY 330180-90-00 BENTLY 135473-01 BENTLY 330190-040-01-00 BENTLY 135489-04 BENTLY 330194-13-20-10-00 BENTLY 136188-02 BENTLY 330500-01-04 BENTLY 136703-01 BENTLY 330500-02-00 BENTLY 146031-01 BENTLY 330703-000-060-10-02-00 BENTLY 149992-01 BENTLY 330703-00-80-10-02-00 BENTLY 1X35869 BENTLY 330704-000-060-10-02-00 BENTLY 21000-16-10-00-256-03-02 BENTLY 330709-000-060-10-02-00