Bently Nevada 21747-045-00 Extension Cable Product Specification
21747-045-00 is factory pre-calibrated matching extension cable engineered for Bently Nevada 7200 and 3300XL standard 8 mm eddy current proximity transducer systems. It works as the dedicated signal transmission jumper between field-mounted 22810-series proximity probes and cabinet-installed proximitor preamplifiers, transferring gap-proportional analog voltage signals to 3300, 7200 or 3500 rack monitor modules for rotor radial vibration and axial displacement measurement. Widely equipped on steam turbines, gas turbines, centrifugal compressors and large turbo-generators within power, petrochemical and metallurgical industries, this calibrated cable ensures the complete sensor loop maintains original factory linearity for machinery safety protection. Every finished cable passes impedance consistency testing, paired system calibration and insulation withstand inspection before factory delivery to sustain stable signal transmission under harsh field conditions including high bearing housing temperature, lubricant oil mist and heavy electromagnetic interference from variable frequency drives and high-current power circuits.
Description
Bently Nevada 21747-045-00 Extension Cable Product Specification
1. Product Overview
21747-045-00 is factory pre-calibrated matching extension cable engineered for Bently Nevada 7200 and 3300XL standard 8 mm eddy current proximity transducer systems. It works as the dedicated signal transmission jumper between field-mounted 22810-series proximity probes and cabinet-installed proximitor preamplifiers, transferring gap-proportional analog voltage signals to 3300, 7200 or 3500 rack monitor modules for rotor radial vibration and axial displacement measurement. Widely equipped on steam turbines, gas turbines, centrifugal compressors and large turbo-generators within power, petrochemical and metallurgical industries, this calibrated cable ensures the complete sensor loop maintains original factory linearity for machinery safety protection. Every finished cable passes impedance consistency testing, paired system calibration and insulation withstand inspection before factory delivery to sustain stable signal transmission under harsh field conditions including high bearing housing temperature, lubricant oil mist and heavy electromagnetic interference from variable frequency drives and high-current power circuits.
2. Part Number Definition Breakdown
Each code segment of 21747-045-00 follows Bently’s standard extension cable coding rules. Base code 21747 represents the core cable series exclusively for 8 mm proximity probes compatible with both 7200 and 3300XL product platforms. Middle segment 045 specifies fixed finished cable physical length of 4.5 meters. The trailing code 00 stands for standard non-armored structure, regular PVC outer jacket and factory pre-molded dual 10-pin mini DIN connectors at two terminals. Cables with different length markings or suffix digits carry different factory calibrated electrical parameters and cannot be directly substituted on-site; improper replacement will alter total calibrated loop length, destroy system original calibration and lead to measurement deviation or accidental protection trip.
3. Core Functional Characteristics
Built with precision 75-ohm controlled-impedance coaxial inner construction to realize perfect electrical matching with standard 8 mm proximity probes and matched proximitor preamplifiers. High-density tinned copper braided shielding with over 95% coverage effectively filters power frequency noise and high-frequency electromagnetic crosstalk during long-distance cabling alongside industrial power cables. Both terminals are permanently factory molded with integrated 10-pin mini DIN plugs; field cutting, splicing or changing connectors is strictly forbidden, as any physical modification will permanently invalidate pre-set factory calibration data of the whole transducer loop. Standard PVC outer sheath protects inner core from industrial dust, incidental light oil splash and routine mechanical abrasion during long-term unit operation. Each cable is fully calibrated with matched probe and proximitor as a complete set at factory to guarantee consistent linear conversion performance of the measurement system.
4. Electrical and Construction Specifications
Uniform 75-ohm characteristic impedance is maintained across the full 4.5-meter cable length to satisfy Bently 3300XL system design standards and preserve signal integrity from probe tip to proximitor input. Two ends are fitted with original factory 10-pin mini DIN molded connectors respectively for probe connection and proximitor connection. This 4.5-meter fixed length accumulates with the built-in integral cable of paired 22810-series probes to form the total calibrated length required for corresponding proximitor setup. Low-capacitance, low-loss internal insulation material minimizes signal attenuation across working frequency range from DC up to 10 kHz. All finished units complete paired calibration with designated sensor sets before shipment; random cross matching with extension cables of different lengths is prohibited in field maintenance work.
5. Environmental Working Parameters
Continuous allowable operating ambient temperature ranges from -40°C to +85°C for regular installation near bearing housings and control cabinets. Spare storage temperature is kept between -55°C and +90°C under dry non-condensing storage space, with applicable relative humidity from 5%RH to 95%RH without surface dew condensation. The cable withstands routine industrial vibration of 10 Hz ~ 2 kHz from adjacent running rotating equipment. Long-term continuous immersion in corrosive liquid, acid fog and persistent high-temperature steam is not permitted to prevent outer jacket cracking and inner insulation deterioration. For installation locations above 1000 meters altitude, shorten periodic inspection cycle appropriately.
6. Installation and Routine Maintenance Guidance
Arrange cable routing separately away from high-current AC cables and inverter output lines during field construction to reduce cross electromagnetic interference. Avoid sharp small-radius bending, over-stretching and heavy squeezing on cable body to prevent internal conductor damage and impedance drift. In regular maintenance cycles, check PVC jacket for oil corrosion, abrasion and cracking, and verify connector locking tightness on both ends to avoid loose-contact induced intermittent signal fluctuation. When cable damage requires replacement, only spare with identical full part number 21747-045-00 can be directly swapped. All replacement cables complete impedance test and calibration matching before factory outbound to ensure full interchangeability within original sensor monitoring loops.
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