Bently Nevada 28407-00-25-36-02 Proximity Probe Product Specification
28407-00-25-36-02 is a 25mm series eddy current proximity probe manufactured by Bently Nevada, belonging to classic large-range displacement transducer product lineup designed for turbomachinery protection and condition monitoring compliant with API 670 industrial standard. This probe is core component of complete proximity measuring system which needs matched dedicated extension cable and corresponding proximitor transducer to form full measurement loop, widely applied for differential expansion, axial thrust position and large-range shaft displacement measurement on large steam turbines, turbo-generators, heavy-duty centrifugal compressors and industrial large blowers in power generation, petrochemical refining and metallurgical industries. Every finished probe undergoes strict factory linearity calibration, high-low temperature cycling aging test, insulation resistance detection and anti-vibration endurance inspection before factory delivery to guarantee stable long-term running under harsh working environment with high temperature, lubricant oil mist and complex electromagnetic field interference inside bearing housings. The clearance variation signal between probe tip and metal rotor target surface is converted into standard analog voltage signal and transmitted to 3500 series rack monitoring modules for real-time data collection, abnormal alarm triggering and equipment safety interlock control.
Description
Bently Nevada 28407-00-25-36-02 Proximity Probe Product Specification
1. Product Overview
28407-00-25-36-02 is a 25mm series eddy current proximity probe manufactured by Bently Nevada, belonging to classic large-range displacement transducer product lineup designed for turbomachinery protection and condition monitoring compliant with API 670 industrial standard. This probe is core component of complete proximity measuring system which needs matched dedicated extension cable and corresponding proximitor transducer to form full measurement loop, widely applied for differential expansion, axial thrust position and large-range shaft displacement measurement on large steam turbines, turbo-generators, heavy-duty centrifugal compressors and industrial large blowers in power generation, petrochemical refining and metallurgical industries. Every finished probe undergoes strict factory linearity calibration, high-low temperature cycling aging test, insulation resistance detection and anti-vibration endurance inspection before factory delivery to guarantee stable long-term running under harsh working environment with high temperature, lubricant oil mist and complex electromagnetic field interference inside bearing housings. The clearance variation signal between probe tip and metal rotor target surface is converted into standard analog voltage signal and transmitted to 3500 series rack monitoring modules for real-time data collection, abnormal alarm triggering and equipment safety interlock control.
2. Part Number Coding Definition
Each segment of part code 28407-00-25-36-02 defines exclusive product configuration parameters separately. The prefix code 28407 represents base model of 25mm large linear range proximity probe product series; the second segment 00 refers to standard probe body thread specification and non-customized probe head mechanical structure; number 25 stands for core specification of 25mm nominal sensor size with fixed factory calibrated sensitivity and dedicated linear measurement scope; 36 indicates total overall length of integrated probe lead cable for the probe itself; the last digit 02 specifies connector type, outer cable sheath structure and factory calibration grade for system matching requirement.
3. Core Product Functions and Working Principle
Operating based on high-frequency eddy current induction theory, the probe converts gap distance changes between sensing tip and conductive rotating target into continuous proportional analog electrical output without any mechanical contact, completely avoiding abrasion and failure risks of contact-type displacement sensors. Its primary application focuses on large-range differential expansion measurement of turbogenerator rotor and stator, thrust bearing axial displacement monitoring and extra-long stroke shaft position detection which cannot be covered by conventional 5mm or 8mm standard proximity probes. After matching with qualified proximitor unit, the system outputs linear voltage signal corresponding to actual clearance value, enabling backend monitoring equipment to set multi-stage warning and shutdown protection thresholds. Once measured displacement exceeds preset safety limit, related interlock relay will be activated to protect critical rotating equipment from catastrophic mechanical damage caused by excessive expansion or axial shifting. Besides static position monitoring, the probe also supports occasional Keyphasor pulse pickup for rotational speed verification under special installation layout.
4. Electrical and Metrology Specifications
The complete transducer system with this probe is powered by regulated negative DC voltage ranging from -17.5VDC to -26VDC supplied by matched proximitor unit, consistent with universal Bently proximity sensor power supply specification. It features fixed factory-set calibrated sensitivity matched to 25mm series standard parameter, possessing extra-wide effective linear measurement range to satisfy large differential expansion measurement demand of heavy industrial turbomachinery. Internal coil and insulated encapsulation structure maintains excellent high insulation resistance to prevent signal drift induced by dampness, oil permeation or temperature fluctuation. The integrated lead cable adopts full shielded coaxial structure to restrain external electromagnetic interference from surrounding power cables and frequency conversion equipment, ensuring stable signal transmission quality during long-distance wiring from field equipment to control cabinet. Only designated matching extension cable and proximitor with same series specification are permitted to pair with this probe to retain original calibration accuracy intact.
5. Environmental Working Parameters
Permitted continuous operating temperature range of probe body is from -40℃ up to +177℃, adapting high-temperature installation environment near turbine bearing pedestal and high-heat unit compartment; spare part storage ambient temperature covers -55℃ to +95℃ under non-condensing storage condition. Applicable working relative humidity ranges between 5%RH and 95%RH with no internal condensation allowed inside probe encapsulation to avoid insulation aging and internal short-circuit fault. The probe can withstand regular industrial ambient vibration from 10Hz to 2kHz during equipment normal operation, while continuous long-term exposure to strong corrosive gas, steam immersion and acid mist surroundings is prohibited to extend service life of internal sensing coil and encapsulating materials.
6. Installation and Routine Maintenance Guidance
The probe is equipped with standard external mounting thread for threaded hole fixing on equipment bearing support or customized installation bracket, allowing fine-tuning of screwing depth to set optimal initial installation clearance between probe tip and target surface according to site commissioning data. During periodic maintenance cycle, maintenance personnel shall regularly check probe fastening tightness, outer cable sheath integrity and connector locking status to eliminate intermittent signal loss caused by loose connection or cable aging damage. When on-site probe breakdown occurs, only replacement spare with identical part number 28407-00-25-36-02 is allowed for direct swapping; random substitution with mismatched specification sensor will result in linearity deviation and inaccurate measurement data. All alternative spare probes complete full factory recalibration and temperature aging test in line with original factory standards to guarantee full interchangeability during equipment overhaul and system maintenance.
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