Bently Nevada 28480-02-90-2-3 Proximity Probe Product Specification
28480-02-90-2-3 belongs to Bently Nevada standard eddy current proximity probe under classic proximity sensor product line, designed for non-contact radial vibration, axial displacement and Keyphasor rotational signal measurement on critical rotating machinery including steam turbines, centrifugal compressors, turbo generators and industrial blowers within power, petrochemical and metallurgical industries. This probe forms a complete proximity measuring system matched with designated extension cable and proximitor transducer, fully complying with API 670 machinery protection standard for TSI turbomachinery monitoring system integration. Every finished probe passes factory linearity calibration, high-low temperature cycling test, insulation resistance inspection and vibration endurance test to guarantee stable long-term operation under harsh industrial environment with lubricating oil mist, temperature fluctuation and complicated electromagnetic interference. Measured gap variation signal is transmitted to 3500 series monitor rack via supporting cable and proximitor for real-time parameter monitoring, abnormal alarming and equipment interlock protection control.
Description
Bently Nevada 28480-02-90-2-3 Proximity Probe Product Specification
1. Product Overview
28480-02-90-2-3 belongs to Bently Nevada standard eddy current proximity probe under classic proximity sensor product line, designed for non-contact radial vibration, axial displacement and Keyphasor rotational signal measurement on critical rotating machinery including steam turbines, centrifugal compressors, turbo generators and industrial blowers within power, petrochemical and metallurgical industries. This probe forms a complete proximity measuring system matched with designated extension cable and proximitor transducer, fully complying with API 670 machinery protection standard for TSI turbomachinery monitoring system integration. Every finished probe passes factory linearity calibration, high-low temperature cycling test, insulation resistance inspection and vibration endurance test to guarantee stable long-term operation under harsh industrial environment with lubricating oil mist, temperature fluctuation and complicated electromagnetic interference. Measured gap variation signal is transmitted to 3500 series monitor rack via supporting cable and proximitor for real-time parameter monitoring, abnormal alarming and equipment interlock protection control.
2. Part Number Definition Breakdown
The multi-segment part code 28480-02-90-2-3 defines core configuration parameters of the proximity probe respectively. The prefix 28480 represents base probe series specification for standard eddy current sensing structure; the second segment 02 stands for probe body overall length specification and built-in mounting thread standard; 90 denotes total system cable length configuration of 9 meters for the full measuring set including probe integral lead plus matched extension cable; the fourth digit 2 specifies cable armor structure and connector interface type; the final number 3 refers to customized mechanical structure variant and factory calibrated sensitivity grade for specific field installation requirement.
3. Core Functional Characteristics
The probe operates on eddy current induction principle to convert the clearance distance between probe tip and rotating shaft target surface into continuous analog electrical signal without mechanical contact, eliminating abrasion and wear issues of contact-type displacement sensors. It is applicable for continuous monitoring of rotor radial vibration, thrust axial position, shaft eccentricity and Keyphasor once-per-revolution pulse pickup after paired with matching extension cable and proximitor unit. The probe maintains fixed calibrated sensitivity within specified linear measuring range, supporting preset alarm threshold setup on subsequent monitor modules to trigger warning or shutdown interlock once mechanical displacement exceeds safe limit. Its robust encapsulated tip structure resists high operating temperature and oil contamination inside bearing housing, adapting for both indoor cabinet layout and high-temperature equipment compartment installation scenarios.
4. Electrical & Measuring Specifications
Matched with designated proximitor, the sensor system delivers fixed calibrated sensitivity consistent with Bently standard specification, featuring defined linear measurement range to cover normal operating clearance of industrial rotating equipment. The proximitor provides regulated negative DC supply ranging from minus 17.5VDC to minus 26VDC to power the entire probe-cable loop circuit. The probe internal insulation structure ensures high insulation resistance value to avoid signal drift caused by dampness or oil infiltration, and the coaxial signal transmission design effectively suppresses external electromagnetic interference for stable signal output quality. The integral lead cable and matched 9-meter full system cable adopt shielded coaxial construction to reduce external field disturbance during long-distance wiring from field equipment to control cabinet.
5. Environmental Working Specification
Continuous allowable working ambient temperature of the probe body ranges from minus 40 degrees Celsius up to +177 degrees Celsius, fitting high-temperature bearing housing installation near turbine and compressor bearing position; spare part storage temperature covers minus 55 degrees Celsius to +95 degrees Celsius under non-condensing ambient condition. Applicable working relative humidity falls within 5% to 95% non-condensing range, avoiding condensed liquid penetration into probe internal encapsulation. The probe can withstand routine industrial vibration from 10Hz to 2kHz during equipment operation, while long-term exposure to strong corrosive gas and continuous steam soaking is prohibited to extend service life of internal sensing coil and insulation material.
6. Installation & Maintenance Instruction
The probe adopts standard thread mounting design for threaded hole installation on bearing pedestal or sensor bracket, allowing adjustable screwing depth to set initial installation clearance between probe tip and rotating target surface according to onsite commissioning data. Full measuring system must use matching cable and proximitor with corresponding specification instead of mismatched spare parts to keep original factory calibration precision unchanged. During periodic maintenance, inspect probe mounting tightness, cable outer sheath integrity and connector fastening condition regularly to eliminate intermittent signal fault from loose connection or cable ageing damage. When replacement is required for damaged unit, only identical part number 28480-02-90-2-3 spare probe is allowed for direct substitution to maintain measuring accuracy of the whole monitoring loop.
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