Bently Nevada 3001-28-42-36-02 Proximity Probe Assembly Product Specification

3001-28-42-36-02 is a factory-calibrated eddy-current proximity probe belonging to classic 3300XL non-contact measuring system engineered by Bently Nevada, designed for real-time monitoring of radial shaft vibration, axial thrust displacement and Keyphasor rotational speed for critical rotating machinery including steam turbines, centrifugal compressors, large generator sets, industrial blowers and heavy-duty process pumps across thermal power, petrochemical refining, metallurgy and chemical manufacturing industries. Every finished probe undergoes strict factory capacitance matching, continuity testing, high-low temperature cycling inspection and sealing durability verification before shipment to guarantee consistent linear output and measuring precision when paired with matched extension cable and 330180 series proximitor transducer. It forms a complete closed-loop measurement circuit together with designated extension cable and proximitor to convert mechanical clearance variation into standard linear voltage signal for subsequent data acquisition via 3500 monitoring rack, site DCS or PLC safety interlock control system.

The five-segment part number follows Bently standard modular coding specification with independent parameter definition for every coded field:The first code 3001 represents core product series designation for standard 8mm diameter proximity probe with M10×1 metric mounting thread, the most widely applied probe specification within 3300XL sensor lineup for general industrial bearing housing installation.Second segment 28 specifies the exposed unthreaded tip length of 28mm, which refers to the bare probe sensing section from probe head to the start of mounting thread, allowing flexible deep insertion into limited-space bearing mounting bore without thread interference.Third group 42 stands for total probe shell overall length at 420mm, tailored for deep-installation working condition where equipment bearing pedestal features lengthy mounting cavity structure.Fourth code 36 defines the factory fixed built-in integral cable length of 3.6 meters pre-connected at probe rear end, this cable length is pre-calculated in full-loop capacitance matching with matched extension cable and proximitor, random field cutting or length modification will break preset electrical matching and cause measuring drift.Final suffix 02 denotes standard connector configuration and outer cable structure: equipped with original stainless steel threaded coupling at cable terminal, non-armored standard fluoropolymer outer jacket without customized metal armor wrapping, universal standard terminal layout compatible with regular 330130 series extension cable connectors. All specification parameters are solidified during factory production and cannot be altered arbitrarily on installation site.

The probe sensing head adopts high-purity alloy core with precise CNC machining, wrapped by high-temperature resistant modified PPS insulating material featuring outstanding oil resistance, anti-corrosion and stable dielectric property under drastic ambient temperature fluctuation. Probe outer shell is constructed with solid stainless steel to resist mechanical collision, workshop lubricating oil corrosion and high-temperature steam erosion near equipment hot casing. Internal lead wire applies multi-strand oxygen-free copper to minimize high-frequency signal attenuation and improve anti-electromagnetic interference performance during signal transmission. Intermediate insulating layer uses fluoropolymer material with fixed dielectric constant to maintain stable capacitance value required by eddy-current measuring principle; outer protective jacket of integrated cable is made of wear-resistant thermoplastic elastomer to prevent scratch damage from on-site wiring friction, dust accumulation and oil mist soaking. The end stainless steel connector is equipped with built-in elastic sealing ring to block moisture, fine metal powder and hydraulic oil penetrating into internal wiring junction when mated with extension cable terminal. The whole probe cable maintains proper flexible bending property to facilitate along-equipment wiring without insulation cracking under standard construction bending radius.

This proximity probe is exclusively matched with 3300XL standard system proximitor transducer powered by rated DC supply ranging from -17.5VDC to -26VDC. The complete measuring loop consisting of probe, matched extension cable and proximitor keeps factory calibrated standard sensitivity of 7.87V/mm (200mV/mil), effective working frequency band covers 0Hz to 10kHz to satisfy both static slow axial displacement tracking and high-frequency dynamic rotor radial vibration sampling requirement.

Continuous permissible operating ambient temperature ranges from -40℃ up to +125℃, adapting low-temperature outdoor equipment layout and high-temperature installation nearby turbine and compressor hot bearing housings; recommended dry storage temperature is controlled within -55℃ ~ +95℃ under non-condensing storage environment. Applicable working relative humidity limits between 5%RH and 95%RH with no internal condensation permitted inside cable and probe structure to avoid insulation aging and internal core short-circuit failure. The probe can endure regular industrial ambient vibration of 10Hz~60Hz; long-term service in environment filled with strong corrosive chemical gas and continuous hot steam immersion is forbidden to extend service lifespan.

3001-28-42-36-02 proximity probes are massively deployed in TSI machinery protection system of power plants, oil refineries and heavy metallurgical workshops, mounted on rotating equipment bearing pedestals to collect real-time clearance signals for vibration and axial position monitoring, supporting equipment over-limit alarming and emergency trip interlock protection to avoid catastrophic unit breakdown.

During routine field maintenance work, operators need periodic visual inspection of probe shell integrity, outer cable jacket abrasion status and connector tightening degree to prevent intermittent signal loss caused by loose connection or jacket rupture leading to oil infiltration inside wiring. For equipment breakdown replacement, only spare probe with identical full part number specification can be adopted; mismatched built-in cable length or unthreaded tip dimension will change total measuring loop capacitance and directly result in monitoring zero drift and invalid measured data. All alternative replacement probes complete full electrical parameter recalibration and sealing aging test per original factory standards before outgoing delivery to guarantee interchangeability during unit overhaul and spare part swap.