Bently Nevada 2789-168 Extension Cable Product Specification
2789-168 is factory pre-calibrated matched coaxial extension cable for Bently Nevada eddy current proximity probe system, designed to connect the integral pigtail of proximity probe and corresponding proximitor to form a complete transducer measurement loop in turbomachinery TSI monitoring system compliant with API 670 standard. Widely used on steam turbines, turbo-generators, centrifugal compressors and large industrial blowers in power, petrochemical and metallurgical industries, it transmits gap-varying analog signals converted by proximity probe to proximitor and subsequent 3500 rack monitor modules for real-time radial vibration, axial displacement and Keyphasor pickup monitoring as well as equipment safety alarm and interlock protection. Every finished cable passes factory continuity test, impedance matching calibration, insulation resistance check and alternating high-low temperature aging test before delivery to sustain stable signal transmission under harsh environments with high temperature, lubricant oil mist and complicated electromagnetic interference inside bearing housings and control cabinets.
Description
Bently Nevada 2789-168 Extension Cable Product Specification
1. Product Overview
2789-168 is factory pre-calibrated matched coaxial extension cable for Bently Nevada eddy current proximity probe system, designed to connect the integral pigtail of proximity probe and corresponding proximitor to form a complete transducer measurement loop in turbomachinery TSI monitoring system compliant with API 670 standard. Widely used on steam turbines, turbo-generators, centrifugal compressors and large industrial blowers in power, petrochemical and metallurgical industries, it transmits gap-varying analog signals converted by proximity probe to proximitor and subsequent 3500 rack monitor modules for real-time radial vibration, axial displacement and Keyphasor pickup monitoring as well as equipment safety alarm and interlock protection. Every finished cable passes factory continuity test, impedance matching calibration, insulation resistance check and alternating high-low temperature aging test before delivery to sustain stable signal transmission under harsh environments with high temperature, lubricant oil mist and complicated electromagnetic interference inside bearing housings and control cabinets.
2. Part Number Definition
2789 represents the base series of standard matched extension coaxial cable for Bently eddy current sensor system; the suffix 168 defines fixed overall calibrated length, terminal connector specification, inner coaxial structure and outer sheath configuration, marking it as factory-calibrated matching variant to coordinate with designated standard proximity probes and proximitors. Random substitution of unmatched cables will break original system calibration parameters.
3. Core Functional Features
Built with full double-shielded coaxial internal construction, this cable minimizes high-frequency signal attenuation and external electromagnetic interference from nearby high-voltage cables and frequency conversion devices during signal transmission, securing linearity of the whole measurement system. High-temperature resistant polymer outer sheath protects inner insulation and conductor against oil erosion, mechanical abrasion and extrusion damage during long-term field operation. Standard gold-plated coaxial connectors are pre-mounted on both cable ends for reliable locking connection with probe tail connector and proximitor port, preventing intermittent signal faults caused by poor contact. The entire cable length is fixed and calibrated at factory to keep original sensitivity and linear range of the paired proximity measurement loop intact.
4. Electrical Specifications
The cable is designed to match Bently standard proximitor power supply ranging from -17.5VDC to -26VDC. Its characteristic impedance and distributed capacitance are strictly calibrated at factory to match corresponding proximity probe specification, reducing high-frequency signal reflection loss and ensuring consistent calibrated sensitivity of the full measurement system. Premium inner insulating material maintains high insulation resistance to avoid signal drift triggered by dampness or oil penetration into cable core. Only paired original proximity probe and matching proximitor specified by factory can be assembled with this cable to retain original measurement precision.
5. Environmental Specifications
Continuous operating temperature of cable main body ranges from -40°C to +177°C, suitable for high-temperature laying near equipment bearing pedestals and indoor cabinet wiring. Spare storage temperature is controlled between -55°C and +95°C under non-condensing ambient condition, and applicable working relative humidity covers 5%RH~95%RH with no dew condensation allowed on cable surface. The cable can withstand routine industrial vibration from 10Hz to 2kHz generated by running rotating equipment; long-term continuous immersion in strong corrosive liquid or persistent hot steam environment is forbidden to avoid early deterioration of insulation layer and inner conductor damage. For installation above 1000 meters altitude, shorten regular inspection cycle properly.
6. Installation and Routine Maintenance Guidance
During field wiring, route the cable away from high-voltage power lines and strong magnetic sources, reserve appropriate slack allowance for equipment vibration and thermal expansion instead of tight stretching. Align the positioning slot of connectors before tightening lock nuts to guarantee full connector engagement. In periodic maintenance, regularly check cable outer sheath integrity, armor crack status and connector fastening tightness to eliminate hidden troubles of intermittent signal loss caused by sheath cracking or loose terminals. When replacement is required on site, only spare cable with identical part number 2789-168 can be directly replaced. All alternative spare cables complete full factory electrical calibration and aging test to ensure full interchangeability during equipment overhaul.
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