Bently Nevada 21747-080-00 Extension Cable Product Specification
21747-080-00 is factory pre-calibrated matched extension cable designed exclusively for Bently Nevada 7200 and 3300XL series standard 8 mm eddy current proximity probe systems. It serves as the intermediate signal transmission link between field-mounted proximity probes and cabinet-installed proximitor preamplifiers, transmitting gap-dependent analog signals from probe assemblies to signal conditioning units for subsequent vibration and displacement measurement by rack-mounted 3300, 7200 or 3500 monitoring modules. Widely deployed on steam turbines, gas turbines, centrifugal compressors and large turbo-generators within power generation, petrochemical and metallurgical industries, this calibrated cable guarantees overall system linearity and measuring precision for rotor radial vibration and axial displacement protection loops. Every finished cable undergoes impedance matching verification, full-loop calibration pairing and insulation withstand testing prior to factory shipment to maintain stable signal transmission performance under industrial environments with high ambient temperature, lubricating oil mist and complicated electromagnetic interference from high-power motors and variable frequency drives.
Description
Bently Nevada 21747-080-00 Extension Cable Product Specification
1. Product Overview
21747-080-00 is factory pre-calibrated matched extension cable designed exclusively for Bently Nevada 7200 and 3300XL series standard 8 mm eddy current proximity probe systems. It serves as the intermediate signal transmission link between field-mounted proximity probes and cabinet-installed proximitor preamplifiers, transmitting gap-dependent analog signals from probe assemblies to signal conditioning units for subsequent vibration and displacement measurement by rack-mounted 3300, 7200 or 3500 monitoring modules. Widely deployed on steam turbines, gas turbines, centrifugal compressors and large turbo-generators within power generation, petrochemical and metallurgical industries, this calibrated cable guarantees overall system linearity and measuring precision for rotor radial vibration and axial displacement protection loops. Every finished cable undergoes impedance matching verification, full-loop calibration pairing and insulation withstand testing prior to factory shipment to maintain stable signal transmission performance under industrial environments with high ambient 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 21747-080-00 follows Bently’s dedicated extension cable coding specification. Base code 21747 represents the core cable series developed for 8 mm standard proximity transducer systems compatible with both 7200 and 3300XL platforms; the middle segment 080 defines fixed total finished cable length of 8 meters; the trailing segment 00 denotes standard PVC outer jacket material, original factory fixed dual 10-pin mini DIN connector configuration and non-armored standard construction variant. Cables with differing suffix digits or length codes carry distinct factory calibration parameters and cannot be directly interchanged on-site, as mismatched cable length or construction will invalidate the whole transducer system’s original calibration and result in severe measurement deviation and false machinery protection triggering.
3. Core Functional Characteristics
The cable adopts precision 75-ohm controlled impedance coaxial internal structure to realize perfect electrical matching with 8 mm 3300XL proximity probes and corresponding proximitor preamplifiers. High-density tinned copper braided shielding with over 95% coverage effectively suppresses external power-frequency clutter and high-frequency electromagnetic interference during long-distance signal transmission in industrial cable trenches alongside high-current power wiring. Both terminals are factory pre-molded with integrated 10-pin mini DIN connectors without field splicing or cutting permission; any on-site modification of cable length or connector replacement will permanently void original factory system calibration. Standard PVC outer jacket provides reliable protection against general industrial dust, light oil splash and mechanical abrasion during equipment long-term running, and the complete cable is pre-calibrated together with matched probe and proximitor at factory to secure consistent linear output characteristics of the entire measurement loop.
4. Electrical and Construction Specifications
Strictly fixed 75-ohm characteristic impedance is maintained along the whole cable length to comply with Bently 3300XL transducer system design standard, ensuring consistent signal integrity from probe tip to proximitor input. The two ends are equipped with original factory 10-pin mini DIN molded connectors respectively for probe side and proximitor side connection. Full cable length is locked at 8 meters per factory specification, which is counted into total system calibrated length together with integral cable of paired 22810 series proximity probes. Low capacitance and low loss internal insulation material minimizes high-frequency signal attenuation within the full working frequency band from DC up to 10 kHz. All finished cables are paired calibrated with designated transducer sets before delivery, prohibiting random cross matching with unmatched length extension cables on-site.
5. Environmental Working Parameters
Continuous permissible operating ambient temperature ranges from -40°C to +85°C for regular industrial cabinet and bearing housing surrounding installation. Spare storage temperature is controlled between -55°C and +90°C under dry non-condensing storage environment with applicable relative humidity spanning 5%RH to 95%RH without dew condensation accumulating on cable outer surface. The cable can withstand routine mechanical vibration of 10 Hz to 2 kHz generated by adjacent operating rotating equipment; long-term continuous immersion in heavy corrosive liquid, strong acid mist and persistent high-temperature steam is forbidden to prevent outer jacket cracking and internal insulation aging. For installation locations above 1000 meters altitude, shorten periodic inspection cycle appropriately to check jacket integrity regularly.
6. Installation and Routine Maintenance Guidance
Arrange signal cable routing separately away from high-current AC power cables and inverter output wiring during field cabling construction to reduce cross electromagnetic coupling interference. Avoid sharp bending, overstretching and heavy mechanical extrusion on cable body to prevent internal conductor damage and impedance variation. In periodic equipment maintenance cycles, regularly inspect outer PVC jacket surface for cracking, oil corrosion and abrasion, and verify connector locking condition at both ends to eliminate loose contact-induced intermittent signal fluctuation. When on-site replacement is required after cable failure, only spare cable with identical full part number 21747-080-00 is permitted for direct swap. All replacement cables complete impedance inspection and factory calibration matching test before outgoing delivery to guarantee full interchangeability within original transducer monitoring loops.
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