Bently Nevada 2789-084 Extension Cable Product Specification
2789-084 is factory pre-calibrated matched coaxial extension cable supporting Bently Nevada eddy current proximity transducer systems. It connects the short integrated pigtail of proximity probes and corresponding proximitor to form a full closed-loop measurement circuit complying with API 670 turbomachinery protection standards. Widely deployed in power generation, petrochemical and metallurgical industries for TSI monitoring on steam turbines, turbo-generators, centrifugal compressors and large industrial blowers, this cable transfers analog voltage signals corresponding to shaft clearance changes to proximitors and subsequent 3500 rack monitor modules for real-time radial vibration, axial thrust displacement and Keyphasor pulse collection, as well as equipment fault warning and safety interlock protection. Every finished cable undergoes continuity test, impedance matching calibration, insulation resistance inspection and high-low temperature cycling aging test before shipment to guarantee stable signal transmission under harsh environments with high temperature, lubricant oil mist and complex electromagnetic interference inside bearing housings and control cabinets.
Description
Bently Nevada 2789-084 Extension Cable Product Specification
1. Product Overview
2789-084 is factory pre-calibrated matched coaxial extension cable supporting Bently Nevada eddy current proximity transducer systems. It connects the short integrated pigtail of proximity probes and corresponding proximitor to form a full closed-loop measurement circuit complying with API 670 turbomachinery protection standards. Widely deployed in power generation, petrochemical and metallurgical industries for TSI monitoring on steam turbines, turbo-generators, centrifugal compressors and large industrial blowers, this cable transfers analog voltage signals corresponding to shaft clearance changes to proximitors and subsequent 3500 rack monitor modules for real-time radial vibration, axial thrust displacement and Keyphasor pulse collection, as well as equipment fault warning and safety interlock protection. Every finished cable undergoes continuity test, impedance matching calibration, insulation resistance inspection and high-low temperature cycling aging test before shipment to guarantee stable signal transmission under harsh environments with high temperature, lubricant oil mist and complex electromagnetic interference inside bearing housings and control cabinets.
2. Part Number Definition
2789 represents the base series of standard calibrated coaxial extension cable for Bently eddy current probe systems; suffix 084 defines fixed factory-calibrated overall cable length, dual-end connector specification, inner coaxial structure and outer sheath configuration. This model is pre-set for designated matching probes and proximitors at the factory; replacing with mismatched non-original cables will invalidate the original calibration parameters of the entire measurement loop and cause measurement deviation.
3. Core Functional Features
Adopting double-layer full shielded coaxial internal construction, the cable effectively restrains external electromagnetic interference and high-frequency signal attenuation during transmission to maintain excellent linearity of the complete transducer system. Its outer sheath is made of high-temperature and oil-resistant polymer to shield inner insulation and conductors from mechanical scratch, extrusion damage and long-term lubricant corrosion. Standard gold-plated coaxial connectors are pre-installed on both cable ends for precise positioning and reliable locked connection with probe tail and proximitor port, lowering intermittent signal faults caused by poor contact. Fixed cable length is precisely calibrated during production to retain original sensitivity and effective linear measurement range of matched proximity measuring sets.
4. Electrical Specifications
Compatible with standard Bently proximitor negative DC supply ranging from -17.5VDC to -26VDC. Characteristic impedance and distributed capacitance are strictly factory-calibrated to coordinate with paired proximity probe parameters and reduce high-frequency signal reflection loss. Premium inner insulating material maintains high insulation resistance to avoid signal drift triggered by dampness or oil infiltration into cable core. Only designated original matching probes and proximitors are permitted to assemble with this cable to preserve factory-calibrated measuring accuracy.
5. Environmental Working Parameters
Continuous operating temperature of cable body ranges from -40°C to +177°C, suitable for high-temperature wiring near bearing pedestals and regular cabinet internal wiring. Spare storage temperature is controlled between -55°C and +95°C under non-condensing ambient condition; applicable working relative humidity spans 5%RH~95%RH with surface condensation prohibited. The cable withstands routine industrial vibration of 10Hz~2kHz from running rotating equipment; long-term continuous exposure to strong corrosive gas and persistent hot steam immersion is forbidden to extend service life of internal insulation and conductors. Shorten regular inspection cycle appropriately for installation above 1000 meters altitude.
6. Installation and Routine Maintenance Guidance
During field routing, separate cable path from high-voltage power lines and strong magnetic equipment to avoid cross interference and reserve proper cable slack for thermal expansion and equipment vibration instead of over-tensioning cable body. Align connector positioning notches fully before tightening lock nuts to realize complete connector engagement. In periodic maintenance, regularly check outer sheath integrity and connector fastening tightness to eliminate hidden intermittent signal loss risks. When on-site replacement is required, only spare cable with identical part number 2789-084 can be directly swapped. All replacement cables complete full factory electrical calibration and aging test before outgoing delivery to ensure full interchangeability during equipment overhaul.
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