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The 86691-01780-1300-15 is a non-contact eddy current proximity transducer probe assembly manufactured by Bently Nevada. It is primarily installed inside the bearing housings of large industrial rotating machinery specifically to measure shaft radial vibration, axial displacement, or keyphasor speed, serving as the foundational hardware source for enterprises to conduct machinery condition monitoring and protection on critical equipment.
ClickLoc Coaxial Miniature Connector
Armored Cable Performance
Chemical & Fluid Resistance
Through a fully enclosed mechanical wrapper and a stainless steel armored long sleeve, this model ensures that the coaxial transmission core wire inside the probe is protected from the risk of external pulling and breakage, and stably introduces the most pristine physical electrical variations collected through the low-loss ClickLoc coaxial connector at the tail into the backend extension communication cable.
As the source signal acquisition hardware for the machinery protection system on the industrial site, this specific specification probe assembly can seamlessly interface with multiple generations of Bently Nevada machinery monitor rack frameworks. Whether facing long-term high-temperature mineral oil immersion inside the bearing housing, high-pressure synthetic lubricating oil spraying, or severe moisture penetration accompanied by airflow, its defense line fused with a Teflon jacket and special engineering plastics acts as a stable physical barrier to prevent signal distortion during transmission.
This high-strength, long-life hardware characteristic enables it to assist the factory’s central control system in conducting uninterrupted over-limit logic monitoring on critical rotor assemblies over several years or even multiple overhaul cycles, and to trigger interlock trip protection in a timely manner when abnormal vibration or sudden displacement variations occur, thereby effectively avoiding the risk of catastrophic property damage to the unit due to harsh operating conditions.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Bently Nevada 86691-01780-1300-15 Proximity Transducer Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Petroleum Refining
Used for axial displacement monitoring of large rich gas compressors and heavy oil catalytic cracking turbine trains in crude distillation or hydrocracking units to prevent major shaft axial movement.
Thermal Power
Installed inside the high-main shaft bearing housings of 300MW/600MW/1000MW supercritical steam turbine generator sets to continuously capture shaft oil film vibration and relative thermal growth displacement.
Nuclear Power
Used for non-contact shaft vibration and keyphasor speed precision tracking on conventional island large steam turbine main bearings and reactor secondary circuit large feedwater pumps in nuclear power plants.
Air Separation Industry
Installed inside the bearing housings of main air compressors, booster oxygen compressors, and cryogenic liquid pumps in large air separation units to capture high-frequency rotor dynamic unbalance at high speeds.
Iron, Steel and Metallurgy Industry
Used for non-contact relative shaft vibration monitoring of blast furnace blower trains, large sintering exhaust fans, and blast furnace Top Pressure Recovery Turbine (TRT) units.
Pulp and Paper Industry
Used for extraction steam turbines in the captive power plants of large modern paper mills and for dynamic micron-level displacement safety monitoring of large pulp turbine separator main shafts.
During the use of 86691-01780-1300-15, it is critical to strictly adjust the initial installation gap between the probe tip and the metallic shaft surface using a calibration instrument (such as the TK-3) to ensure the initial output voltage sits within the linear core zone required by the Proximitor (typically around -10 VDC).
Meanwhile, knocking or squeezing the probe tip is strictly prohibited, and double nuts must be applied during mechanical fixing to prevent loosening caused by long-term high-frequency vibration.
Furthermore, field wiring must be routed through conduit to protect the stainless steel armored cable from excessive pulling, and the ClickLoc coaxial connector at the tail must be fully sealed using dedicated heat-shrink tubing or insulating boots to thoroughly isolate it from high-temperature lube oil and moisture inside the bearing housing, preventing impedance changes that trigger a monitoring system "Not OK" fault.
86691-01780-1300-15 is a non-contact displacement sensing device built upon the induction mechanism of high-frequency alternating magnetic fields. This assembly mainly consists of a rigid metallic threaded protective body, a terminal sensing tip, and an armored cable capable of resisting mechanical pulling. In actual industrial fields, it is typically attached externally to the bearing housing casings of machinery or aligned with the surface of a rotating shaft using dedicated clamps or brackets. The sensing tip houses a precise conductive coil inside which receives high-frequency alternating current through matching extension cables and proximitors. This action creates a miniature spatial induction field between the probe tip and the metallic rotating shaft surface while generating an instant electrical response to any tiny clearance distance fluctuations, shaft centerline motion trajectories, or sudden amplitude variations. The specific suffix coding adopted by this model defines its customized specifications regarding wiring length, armored wrapping coverage, and coaxial miniature connectors. This enables it to interface perfectly with various generations of Bently Nevada framework monitoring modules. It also provides excellent spatial shielding capabilities against oil contamination and high-temperature moisture penetration to deliver the foundational physical electrical signals for continuous monitoring, over-limit alarming, and emergency trip protection of rotating machinery within extreme internal enclosure environments.
It is a non-contact eddy current displacement sensor probe manufactured by Bently Nevada.
What is the core function of 86691-01780-1300-15?
It is used for high-precision measurement of radial vibration, axial displacement, or keyphasor speed signals of rotating machinery shafts.
What is the basic operating principle of 86691-01780-1300-15?
The probe tip coil generates an alternating magnetic field, producing eddy currents when the metallic shaft approaches, which changes the impedance and converts it into a displacement signal.
How to properly install the 86691-01780-1300-15?
It must be rigidly secured using a dedicated probe mounting bracket, adjusting the threads to maintain the correct initial gap voltage between the probe tip and the shaft surface.
What equipment needs to be used in conjunction with 86691-01780-1300-15?
It must be connected to a dedicated Proximitor sensor, which then interfaces with the monitor modules of a 3500 or 3300 machinery protection system.
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