Bently Nevada 21515-00-36-10-02 Eddy Current Proximity Probe Product Specification
21515-00-36-10-02 is a factory pre-calibrated 5 mm standard eddy current proximity probe designed for Bently Nevada 7200 series transducer system, compatible with matching 2155 series proximitor preamplifiers and certified extension cables to build a complete non-contact measuring system. Based on eddy current induction principle, the probe converts tiny clearance variation between sensing tip and conductive metallic rotating target into linear analog voltage output, which is transmitted to 7200 or 3500 rack monitoring modules for real-time measurement of rotor radial vibration, axial displacement and Keyphasor speed signal collection on critical rotating machinery. Widely deployed on steam turbines, gas turbines, centrifugal compressors and large turbo-generators in power generation, petrochemical and metallurgical industries, this probe fully complies with API 670 machinery protection standards to support pre-alarm setup and emergency shutdown interlock functions for unit safety control. Every finished probe passes strict linearity calibration, high-low temperature cyclic aging test and hermetic sealing inspection before factory delivery to maintain stable measuring accuracy under harsh field environments with high bearing housing temperature, lubricating oil mist and complicated electromagnetic interference from high-power motors and variable frequency drives.
Description
Bently Nevada 21515-00-36-10-02 Eddy Current Proximity Probe Product Specification
1. Product Overview
21515-00-36-10-02 is a factory pre-calibrated 5 mm standard eddy current proximity probe designed for Bently Nevada 7200 series transducer system, compatible with matching 2155 series proximitor preamplifiers and certified extension cables to build a complete non-contact measuring system. Based on eddy current induction principle, the probe converts tiny clearance variation between sensing tip and conductive metallic rotating target into linear analog voltage output, which is transmitted to 7200 or 3500 rack monitoring modules for real-time measurement of rotor radial vibration, axial displacement and Keyphasor speed signal collection on critical rotating machinery. Widely deployed on steam turbines, gas turbines, centrifugal compressors and large turbo-generators in power generation, petrochemical and metallurgical industries, this probe fully complies with API 670 machinery protection standards to support pre-alarm setup and emergency shutdown interlock functions for unit safety control. Every finished probe passes strict linearity calibration, high-low temperature cyclic aging test and hermetic sealing inspection before factory delivery to maintain stable measuring accuracy under harsh field environments with high bearing housing temperature, lubricating oil mist and complicated electromagnetic interference from high-power motors and variable frequency drives.
2. Part Number Definition Breakdown
Each segmented code of 21515-00-36-10-02 follows Bently’s dedicated proximity probe coding rules. Base code 21515 stands for core product series of 5 mm standard front-mounted proximity probe exclusively developed for 7200 transducer platform; segment 00 defines fixed internal coil layout, body mechanical dimension and original factory electrical calibration parameters; segment 36 specifies special extended mounting thread specification for customized installation requirement; segment 10 represents fixed pre-molded integral cable length of 1.0 meter attached directly to probe body; final segment 02 denotes standard miniature coaxial terminal connector fitted at cable end for connection with matched extension cable. Probes with any altered segment codes carry different mechanical dimensions or calibrated electrical characteristics and cannot be directly replaced on-site without full-loop recalibration, otherwise the original factory calibration of entire measuring loop will be invalidated and lead to measurement deviation or unexpected equipment protection malfunction.
3. Core Functional Characteristics
The probe sensing head and threaded mounting body are manufactured from high-strength corrosion-resistant stainless steel material with outstanding anti-oil and anti-vapor performance inside confined bearing chamber environment. Internal induction coil is fully fixed and encapsulated by high-temperature epoxy potting compound to eliminate internal air gap, effectively preventing coil displacement or inter-turn short-circuit caused by long-term equipment continuous vibration and ambient temperature fluctuation. Equipped with standard 75-ohm controlled impedance coaxial integral cable covered by high-temperature insulation material, the cable features dense braided shielding to suppress external electromagnetic noise during signal transmission. Field cutting, splicing or replacement of the original integral cable and terminal connector is strictly prohibited, any physical modification will permanently void factory preset calibration data. Only when assembled with original certified extension cable and designated 2155 series proximitor can the complete transducer system retain fixed linear conversion characteristic, enabling backend monitor modules to configure safety threshold values for machinery over-limit protection. Abnormal open-circuit or short-circuit fault of probe wiring can be rapidly identified via obvious output voltage offset to simplify on-site troubleshooting work.
4. Electrical and Metrological Specifications
The complete transducer system is powered by matched proximitor with regulated negative DC supply ranging from -17.5 VDC to -26 VDC, and typical field operating voltage is -24 VDC. Factory locked fixed sensitivity is customized for standard 5 mm probe specification with full-span linearity tolerance controlled within ±5% in accordance with API 670 industrial standard. Valid linear measuring range is designed for conventional small-gap radial vibration and short-stroke axial displacement monitoring of most industrial rotating shafts. Effective frequency response covers DC up to 10 kHz to satisfy collection demands of both slow thermal expansion drift signal and high-frequency dynamic shaft vibration signal. The minimum recommended target diameter and applicable target material follow Bently standard specification for carbon steel workpiece; recommended pre-installation gap is set near the middle point of linear range to secure stable working point during long-term operation.
5. Environmental Working Parameters
Continuous permissible operating ambient temperature of probe sensing part ranges from -35°C up to +120°C to adapt high-temperature installation near heated turbine bearing housings and cylinder casings. Spare storage temperature is maintained between -55°C and +85°C under dry non-condensing storage environment; applicable working relative humidity ranges from 5%RH to 100%RH, while long-term continuous immersion in liquid oil or condensed water is forbidden to protect internal insulation integrity of coil and cable. The probe can withstand routine industrial vibration of 10 Hz to 2 kHz generated by adjacent running rotating equipment. Persistent exposure to strong corrosive gas and continuous hot steam environment shall be avoided to extend service life of internal components. For installation locations above 1000 meters altitude, shorten regular inspection cycle appropriately to check mounting tightness and cable condition periodically.
6. Installation and Routine Maintenance Guidance
Cut off power supply of the whole monitoring loop before field installation, screw the probe into reserved threaded hole of bearing housing or customized mounting bracket, adjust pre-installation clearance to rated design gap and lock fastening nut to prevent loosening induced by long-time equipment running vibration. During cabling construction, separate probe signal cable routing away from high-current AC power cables and inverter output wiring to reduce cross electromagnetic coupling interference. In periodic maintenance cycles, regularly inspect outer cable insulation for cracking, oil corrosion and abrasion damage, and check connector locking condition at cable end. If probe failure requires on-site replacement, only spare part with identical full part number 21515-00-36-10-02 is allowed for direct swap. All replacement probes complete full electrical performance testing and alternating temperature aging screening before factory shipment to guarantee complete interchangeability inside original vibration monitoring loops.
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