Bently Nevada 28400-10-25-36-02 Eddy Current Proximity Probe Product Specification
28400-10-25-36-02 is a factory-calibrated eddy current proximity probe from Bently Nevada’s standard 25mm probe series, designed for non-contact displacement and vibration measurement of critical turbomachinery in power, petrochemical and metallurgical industries, complying fully with API 670 turbomachinery protection specifications. As a core component of a complete proximity transducer system, it must be matched with specified extension cable and compatible proximitor to form an intact measuring loop for TSI supervision systems. Typical measurement applications include large-range axial thrust displacement, casing differential expansion and heavy-duty shaft position monitoring on steam turbines, turbo-generators and large centrifugal compressors. Every finished probe undergoes linearity calibration, alternating high-low temperature cycling test, insulation resistance inspection and vibration durability test before shipment to ensure stable performance under harsh working conditions with high ambient temperature, heavy lubricating oil mist and complicated electromagnetic interference. Gap variation between probe tip and metallic target surface is converted into proportional analog voltage signals and transmitted to 3500 series rack monitor modules for real-time data tracking, pre-alarm activation and safety interlock protection of rotating equipment.
Description
Bently Nevada 28400-10-25-36-02 Eddy Current Proximity Probe Product Specification
1. Product Overview
28400-10-25-36-02 is a factory-calibrated eddy current proximity probe from Bently Nevada’s standard 25mm probe series, designed for non-contact displacement and vibration measurement of critical turbomachinery in power, petrochemical and metallurgical industries, complying fully with API 670 turbomachinery protection specifications. As a core component of a complete proximity transducer system, it must be matched with specified extension cable and compatible proximitor to form an intact measuring loop for TSI supervision systems. Typical measurement applications include large-range axial thrust displacement, casing differential expansion and heavy-duty shaft position monitoring on steam turbines, turbo-generators and large centrifugal compressors. Every finished probe undergoes linearity calibration, alternating high-low temperature cycling test, insulation resistance inspection and vibration durability test before shipment to ensure stable performance under harsh working conditions with high ambient temperature, heavy lubricating oil mist and complicated electromagnetic interference. Gap variation between probe tip and metallic target surface is converted into proportional analog voltage signals and transmitted to 3500 series rack monitor modules for real-time data tracking, pre-alarm activation and safety interlock protection of rotating equipment.
2. Part Number Segmentation Definition
Each code segment of 28400-10-25-36-02 stands for fixed configuration parameters. The base code 28400 represents the standard 25mm probe base structure series; the second segment 10 defines customized probe body structure, mounting thread type and mechanical dimension variant; 25 refers to 25mm nominal tip size with corresponding factory fixed sensitivity and wide linear measurement range; 36 specifies the length of probe’s factory-integrated integral lead cable; the final code 02 denotes connector specification, outer cable sheath material and calibrated grade for system matching.
3. Core Functional Features
Working on high-frequency eddy current induction principle, the probe realizes contact-free distance detection without mechanical wear between sensing head and rotating target. It is mainly used for large-stroke displacement measurement scenarios beyond the measuring range of conventional small-size proximity probes. After pairing with matching proximitor, the whole transducer system outputs linear voltage signals corresponding to actual clearance values, enabling backend monitor modules to set multi-level alarm and trip thresholds. Once monitored displacement exceeds preset safe limits, the system triggers alarm or equipment shutdown interlock to prevent severe mechanical failures such as excessive thrust pad wear and abnormal thermal expansion of unit components. In certain field arrangements, this probe can also be applied for Keyphasor pulse pickup to provide phase reference for shaft vibration analysis.
4. Electrical and Metrological Specifications
The full transducer loop is powered by matched proximitor supplying regulated negative DC voltage ranging from -17.5VDC to -26VDC, consistent with Bently’s universal eddy current sensor power standard. The probe retains fixed factory-calibrated sensitivity and designated wide linear measuring range to satisfy large displacement monitoring requirements of heavy turbomachinery. Internal coil and high-performance encapsulated insulation guarantee excellent insulation resistance to avoid signal drift caused by oil penetration or ambient humidity change. The integral lead cable adopts full shielded coaxial construction to restrain external electromagnetic interference during signal transmission. Only original matching extension cable and designated proximitor are allowed for assembly to keep factory calibration precision unchanged.
5. Environmental Performance Parameters
The continuous operating temperature of probe body ranges from -40°C to +177°C, suitable for installation inside high-temperature bearing housings and equipment compartments of turbines and compressors. Storage temperature for spare parts is controlled between -55°C and +95°C under non-condensing environment. Applicable working relative humidity covers 5%RH to 95%RH, and condensation inside probe encapsulation is forbidden to prevent insulation degradation and internal short circuit. The probe can endure regular industrial vibration of 10Hz~2kHz during equipment operation, while long-term continuous exposure to strong corrosive gas and persistent hot steam immersion is prohibited to prolong internal component service life. For installation above 1000 meters altitude, shortening routine inspection cycle is recommended for better heat dissipation management.
6. Installation and Routine Maintenance Guidance
The probe features standard external mounting thread to be screwed into pre-tapped holes on bearing pedestals or customized installation brackets. Technicians adjust screwing depth during commissioning to set correct initial gap between probe tip and target surface as required by design documents. In regular maintenance work, inspect probe mounting tightness, cable outer sheath integrity and connector locking condition periodically to avoid intermittent signal faults induced by loose wiring or cable aging. When replacement is needed, only spare probe with identical part number 28400-10-25-36-02 can be directly installed; using mismatched specification products will lead to linearity deviation and inaccurate measurement data. All replacement probes complete full recalibration and temperature aging test per original factory standards before delivery to ensure full interchangeability during unit overhaul.
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