Bently Nevada 31000-14-05-30-020-01-02 Probe Mount Housing Assembly Product Specification

31000-14-05-30-020-01-02 is a factory pre-assembled threaded probe mounting housing from Bently Nevada’s 31000 product family, specially engineered to install 3300XL series 8mm eddy-current proximity probes on bearing housings of critical rotating machinery such as steam turbines, centrifugal compressors, large feed pumps and industrial blowers. This complete assembly integrates structural housing, stainless steel internal sleeves, locking hardware, compression cable glands and elastic sealing components, enabling fixed through-housing installation for radial vibration monitoring and keyphasor speed pickup within machinery protection TSI systems. When matched with corresponding proximity probe, extension cable and compatible proximitor transducer, the unit forms a full non-contact clearance measurement loop to transmit real-time shaft gap data to Bently 3500 or legacy 3300 rack monitoring modules as well as site DCS and PLC control platforms. All finished assemblies pass factory dimensional inspection, air tightness sealing test and pre-assembly verification before shipment to ensure consistent mounting precision and long-term sealing reliability under harsh industrial conditions filled with high temperature, oil mist and trace corrosive vapor. Original units are manufactured to US factory standards, while qualified refurbished assemblies undergo full reassembly and sealing performance recheck for field maintenance replacement.

The seven-segment part number follows standardized Bently coding rules with independent parameter definition for each section:The first code 31000 stands for the core series designation of through-wall threaded mounting housing exclusively developed for 3300XL standard proximity probe series.The second digit group 14 indicates the inner cavity dimension is customized to accommodate industry-standard 8mm outer diameter 3300XL proximity probe body, limiting installation only to matched 8mm diameter probes.The third code 05 specifies factory pre-fixed internal integrated probe cable length at 0.5 meter pre-contained inside the housing assembly.The fourth code 30 represents installation spacer configuration, fitted with type-30 intermediate standoff sleeve to realize adjustable spacing between equipment casing surface and main housing body during field mounting.The fifth code 020 defines preset probe tip penetration depth at 2.0 inches from the thread end face toward measured metallic shaft surface for standard installation clearance setup.The sixth code 01 denotes internal fitting layout with single-piece compression-type cable sealing grommet structure for waterproof and dustproof locking of outgoing probe cable.The final segment 02 sets external mounting thread specification as standard 3/4-14 NPT male thread for direct threading into pre-tapped bearing housing mounting holes. Each coded parameter is factory locked, so random part replacement without matching specifications will cause assembly failure or incorrect probe installation depth.

The main housing body is produced from glass-fiber-reinforced conductive PPS polyphenylene sulfide thermoplastic material, featuring excellent anti-static performance, outstanding hydrocarbon oil resistance and high-temperature endurance to adapt continuous high ambient temperature near hot-running equipment. Internal positioning sleeves, locking nuts and threaded adapters adopt AISI304 stainless steel for superior anti-rust and mechanical strength against long-term vibration fatigue. All built-in sealing O-rings are made of oil-resistant neoprene rubber to block cutting fluid, lubrication oil mist and fine metal powder from penetrating into inner cavity. The whole assembly meets IP66 environmental ingress protection level for dust and splash prevention. With fixed 3/4-14 NPT external thread and pre-calibrated 2-inch probe extension stroke, the component requires no extra on-site machining after installation and keeps stable probe positioning dimension under long-cycle equipment operation.

This mounting housing works cooperatively with standard Bently 3300XL 8mm proximity probe, customized extension cable and corresponding proximitor transducer which runs on rated negative DC supply ranging from -17.5VDC to -26VDC. The complete measurement system maintains factory-calibrated standard sensitivity of 7.87V per millimeter with effective frequency response from 0Hz up to 10kHz, supporting both static axial displacement tracking and high-frequency dynamic radial vibration collection for high-speed rotating rotors.

Permitted continuous operating ambient temperature ranges from -40℃ to +120℃ to cover low-temperature outdoor layout and high-temperature installation adjacent to turbine and compressor casings; safe storage temperature spans from -55℃ to +90℃ under fully dry non-condensing surroundings. Applicable working relative humidity is controlled between 5%RH and 90%RH without internal condensation to prevent component corrosion and insulation degradation. When installed at altitude over 1000 meters above sea level, periodic inspection frequency of sealing parts needs proper increase due to changed atmospheric condition. The assembly can sustain regular industrial mechanical vibration within 10Hz to 55Hz; long-term service in environments with strong corrosive gas, accumulated conductive metal scraps and persistent chemical vapor is strictly forbidden to extend service life of sealing rings and internal structural fittings.

31000-14-05-30-020-01-02 mounting assemblies are widely deployed on bearing housings of steam turbines, centrifugal compressors, large boiler feed pumps and generator sets in thermal power plants, petrochemical refineries and metallurgical rolling workshops, undertaking fixed installation of vibration and keyphasor probes for machinery safety protection systems to trigger pre-alarm and emergency trip once shaft vibration or axial shift exceeds safety threshold.

During regular on-site maintenance, operators need periodic visual inspection of housing thread tightness and external sealing integrity to avoid oil and moisture infiltration caused by loose assembly; regular clearance check of protruding probe tip dimension is required to confirm no shift of preset penetration depth under long-term equipment vibration. For breakdown spare replacement, only full housing assembly with identical part specification shall be selected; mismatched thread size or penetration setting will lead to wrong measuring gap and inaccurate monitoring data. All aftermarket refurbished mounting housings complete sealing pressure test and dimensional re-verification per original factory technical standards before delivery to guarantee installation consistency matching brand-new original products.