Bently Nevada 21747-065-00 Extension Cable Product Specification
21747-065-00 is factory pre-calibrated matched extension cable specially developed for Bently Nevada 7200 and 3300XL 8 mm eddy current proximity transducer systems. It acts as the intermediate signal transmission link between 22810-series 8mm proximity probes installed on bearing housings and proximitor preamplifiers mounted inside control cabinets, delivering gap-related analog voltage signals for rotor radial vibration and axial position monitoring on steam turbines, gas turbines, centrifugal compressors and large generator sets across power, petrochemical and metallurgy industries. Every finished cable completes precise impedance matching, full-loop calibration pairing and high-voltage insulation testing before factory release to guarantee stable signal transmission amid complicated industrial environments with high oil mist, wide temperature fluctuation and heavy electromagnetic interference from frequency converters and high-power power cables. Any random replacement with unmatched-length cables will break the original system calibration and trigger inaccurate measurement or unexpected equipment protection trips.
Description
Bently Nevada 21747-065-00 Extension Cable Product Specification
1. Product Overview
21747-065-00 is factory pre-calibrated matched extension cable specially developed for Bently Nevada 7200 and 3300XL 8 mm eddy current proximity transducer systems. It acts as the intermediate signal transmission link between 22810-series 8mm proximity probes installed on bearing housings and proximitor preamplifiers mounted inside control cabinets, delivering gap-related analog voltage signals for rotor radial vibration and axial position monitoring on steam turbines, gas turbines, centrifugal compressors and large generator sets across power, petrochemical and metallurgy industries. Every finished cable completes precise impedance matching, full-loop calibration pairing and high-voltage insulation testing before factory release to guarantee stable signal transmission amid complicated industrial environments with high oil mist, wide temperature fluctuation and heavy electromagnetic interference from frequency converters and high-power power cables. Any random replacement with unmatched-length cables will break the original system calibration and trigger inaccurate measurement or unexpected equipment protection trips.
2. Part Number Definition Breakdown
The three-segment coding of 21747-065-00 follows Bently’s standard extension cable naming rule. The base code 21747 stands for the dedicated cable series for 8mm proximity sensors compatible with both 7200 and 3300XL monitoring platforms. Middle code 065 defines the fixed overall finished cable length at 6.5 meters. The last two-digit code 00 represents standard non-armored construction with regular PVC outer jacket and original factory pre-molded dual 10-pin mini DIN connectors at both ends. Variants with different suffix digits feature distinct internal calibration parameters and cannot be cross-used on-site, as changed cable construction or length will alter the total calibrated loop length required by the paired proximitor.
3. Core Functional Characteristics
This extension cable is constructed with precision 75-ohm controlled impedance coaxial inner structure to achieve perfect electrical matching with all 22810 series 8mm proximity probes and matched proximitor preamplifiers. High-density tinned copper braided shielding with over 95% coverage effectively blocks outside power-frequency disturbance and high-frequency electromagnetic coupling interference during long-distance signal routing alongside heavy-current power lines in cable trenches. Both terminals are permanently factory molded with integrated 10-pin mini DIN connectors; field cutting, splicing or connector replacement is strictly forbidden since such modification invalidates factory pre-calibration permanently. Standard PVC outer sheath offers reliable protection against industrial dust, incidental light oil splashing and routine mechanical abrasion for long-term continuous field operation. The entire cable assembly is calibrated together with matched probe and proximitor at manufacturer factory to retain consistent linear output of the full measurement circuit.
4. Electrical and Construction Specifications
Fixed 75-ohm characteristic impedance is maintained uniformly across the full 6.5-meter cable length to comply with Bently’s 3300XL proximity system design criteria and preserve complete signal integrity from probe sensing tip to proximitor input terminal. Two ends adopt original factory 10-pin mini DIN molded connectors separately for probe-side and proximitor-side connection. This 6.5-meter length is counted into the total calibrated loop length together with the integral built-in cable of paired 22810 series probes to confirm the correct setup parameter of corresponding proximitor unit. Low-loss and low-capacitance inner insulating material restrains signal attenuation across the whole effective working frequency band ranging from DC up to 10 kHz. Each individual cable undergoes paired calibration with designated transducer group before shipment, prohibiting arbitrary matching with extension cables of different specifications during on-site maintenance.
5. Environmental Working Parameters
The permissible continuous operating ambient temperature spans from -40°C to +85°C for regular installation around equipment bearing pedestals and control cabinet surroundings. Recommended spare part storage temperature ranges between -55°C and +90°C under dry, non-condensing storage condition, with applicable ambient relative humidity covering 5%RH to 95%RH without dew formation on cable outer surface. The cable can withstand normal mechanical vibration of 10 Hz to 2 kHz generated by adjacent running rotating machinery, while long-term soaking in strong corrosive fluid, concentrated acid vapor and persistent high-temperature steam is prohibited to avoid outer jacket cracking and inner insulation aging. For installation sites above 1000 meters above sea level, shorten routine inspection cycle to periodically check jacket integrity and connector tightness.
6. Installation and Routine Maintenance Guidance
During field wiring layout, separate the transducer extension cable routing away from high-current AC power cables and inverter output wiring to minimize electromagnetic cross-coupling interference. Avoid sharp acute bending, excessive stretching and heavy mechanical compression on cable body to prevent inner conductor breakage and unexpected impedance shift. Within regular equipment maintenance cycles, routinely inspect PVC jacket surface for oil corrosion, abrasion and crack damage, and check locking status of both-end connectors to eliminate intermittent signal fluctuation caused by loose connection. Once original cable fails on site, only spare parts with identical full part number 21747-065-00 are allowed for direct replacement. All replacement cables pass factory impedance inspection and calibration matching test prior to delivery to ensure full interchangeability inside the original vibration monitoring loop.
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