Bently Nevada 106765-25 Interconnect Cable Product Specification

106765-25 is a factory pre-terminated shielded interconnection cable originally manufactured by Bently Nevada, a Baker Hughes subsidiary in the United States, specially engineered as the matched extension cable for Velomitor XA piezoelectric velocity transducers in rotating machinery condition monitoring systems. The suffix “-25” stands for fixed finished overall length of 25 meters, with one end factory fitted with hermetically sealed metal connector for direct mating with sensor body and the opposite end stripped bare for field termination to proximitor or 3500 series monitoring rack terminal blocks. Designed in strict compliance with API 670 industrial standard for turbomachinery protection, this cable serves as the exclusive intermediate signal transmission path to deliver sensor excitation power and converted vibration analogue signals between field-mounted velocity pickup sensors and cabinet-installed monitoring modules, widely deployed on critical rotating equipment across thermal power generation, petrochemical refining, metallurgical processing and offshore oil & gas production facilities. Every finished cable undergoes full factory electrical calibration and environmental aging test to guarantee fixed electrical length matching, which is the core prerequisite to eliminate measurement drift and abnormal false alarm for machinery vibration monitoring loops.

First of all, the cable completes dual-way signal transmission: it conducts DC supply voltage from proximitor module to Velomitor XA sensor to maintain normal transducer operation, while feeding back low-level vibration analogue induction signals captured by the piezoelectric pickup back to monitoring hardware for amplitude, frequency and fault characteristic analysis. Its precisely controlled distributed capacitance and impedance realize low-loss broadband signal transfer within the working frequency range of 4.5Hz to 2kHz, restricting signal attenuation and waveform distortion under long-distance wiring up to 25 meters. The full enclosed multi-layer shielding construction provides minimum 85dB shielding efficiency against external electromagnetic interference generated by variable frequency drives, high-current power cables and large industrial motors, effectively avoiding noise contamination to weak millivolt-level vibration signals on industrial site with complicated electromagnetic environment. In addition, the hermetic sealed connector structure prevents ingress of moisture, industrial oil, corrosive gas and dust into internal wiring contacts, securing stable long-term circuit continuity under continuous mechanical vibration from on-site running equipment.

The cable core conductor adopts multi-strand tinned copper wire configuration, which improves cable bending flexibility and restrains oxidation corrosion at wire core to stabilize long-term conductive performance and reduce inherent DC resistance per meter. Primary insulation layer is extruded with high-performance fluoropolymer (Teflon) material featuring outstanding oil resistance, high temperature resistance and chemical inertness against acid, alkali and various industrial lubricants commonly seen in turbine and compressor compartments. Outside insulation is wrapped with dense braided tinned copper shielding layer covering full cable circumference, followed by customized high-temperature resistant outer jacket to resist mechanical abrasion, impact and ambient chemical erosion. The probe-side connector complies with Mil-C-26482 military standard, made of solid 316L stainless steel with full hermetic sealing treatment; keyed anti-misplug design prevents wrong orientation during field installation, and integrated rubber splash-proof boot further improves environmental tightness of connection joint. Minimum allowable dynamic bending radius reaches ten times of outer cable diameter to satisfy wiring routing around equipment base and cabinet internal narrow layout without inner conductor fracture damage. Gross shipping weight of single 25-meter finished cable assembly is approximately 3.0kg under original factory anti-static packaging.

Rated working voltage of the cable is 300V alternating current or 75V direct current, with maximum permissible carrying current of 2A for single core wire to match standard sensor power supply specification of Bently monitoring system. Distributed capacitance is controlled below 60pF per foot to maintain consistent electrical length matching between full cable assembly and paired proximitor unit, with total electrical length tolerance controlled within ±0.2% of nominal value after factory calibration to avoid systematic measuring error. DC conductor resistance is limited under 0.05Ω per meter to cut down power supply loss from monitoring module to field sensor and reduce signal amplitude attenuation in long-distance transmission. Overall circuit noise is suppressed below 0.004mm/s RMS across full working frequency bandwidth, ensuring original vibration waveform restoration during signal transmission.

Continuous rated working ambient temperature range covers -55°C up to +121°C, enabling stable operation inside high-temperature turbine casing surrounding area and low-temperature outdoor coastal platform control cabinet simultaneously. Product storage temperature spans -50°C to +85°C under dry and ventilated warehouse condition without corrosive liquid splash or condensed moisture on cable surface. Applicable working relative humidity is from 5%RH to 95%RH under non-condensing environment, adapting high-humidity cabinet environment of coastal petrochemical plants and offshore drilling equipment control room. The finished cable assembly can withstand instantaneous mechanical shock up to 5000g during transportation and equipment overhaul dismounting without internal wire breakage or shielding layer separation. The outer jacket and connector sealing component pass industrial oil immersion test to resist long-term erosion from turbine lubricating oil and hydraulic fluid on working site.

This 106765-25 interconnect cable is exclusively matched with Bently Nevada Velomitor XA series piezoelectric velocity sensors as field pickup component, and compatible with full range of Bently 3300 series and 3500 series rack-mounted monitoring modules including vibration monitor cards for casing vibration, bearing housing vibration monitoring. It is the standard wiring component for permanent online condition monitoring system of steam turbine, centrifugal compressor, induced draft fan, rolling mill and large reciprocating pump units in power, petrochemical and metallurgy industries. The collected vibration signals transmitted via this cable support real-time equipment abnormal vibration pre-alarm and emergency trip interlock logic setup of turbomachinery protection system, helping operators identify early bearing wear, rotor unbalance and gear meshing fault of rotating equipment before severe breakdown occurs. When applied in Class I hazardous explosive area, intrinsic safety isolation barrier must be added on intermediate wiring route complying with local explosion-proof electrical regulation.

Every individual 106765-25 cable completes multiple mandatory pre-delivery inspections at original US production factory, including electrical length verification, insulation resistance test, shielding effectiveness detection, high-low temperature cycling aging test and connector air tightness inspection to eliminate hidden manufacturing defects before delivery. Original factory limited warranty period lasts for twelve consecutive months starting from the date of product delivery to end user; free replacement or maintenance service is available for products with confirmed inherent production flaw under rated working environment and standardized wiring installation within warranty term. Damage induced by unauthorized cable cutting, wrong wiring connection, overvoltage surge impact, artificial mechanical pulling, chemical corrosion and ultra-temperature over-range operation is excluded from official warranty coverage, and relevant maintenance cost shall be borne by product user side.