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The 21747-075-01 is a stainless steel armored probe extension cable belonging to the 7200 Series 5mm and 8mm proximity transducer systems. As a key component of the industrial non-contacting measurement system, this cable is deployed between the physical measurement end and the signal processing end, delivering low-loss and high-fidelity transmission for high-frequency RF signals. This product is widely applied in large rotating machinery across power, petrochemical, and metallurgical industries, ensuring stable transmission of radial shaft vibration, axial displacement, and Keyphasor signals.
Fully certified under ATEX, IECEx, and CSA frameworks for safe operation in hazardous arease
The integrated stainless steel flexible armor resists heavy crushing and foot traffic, supports up to a 133-Newton tensile load, and permits raw routing without cable trays
The 85Ω coaxial core paired with gold-plated connectors ensures high-frequency signal transmission without reflection or distortion, precisely capturing micrometer-level displacement
The 7200 5 mm and 8 mm Proximity Transducer Systems are noncontacting, gap-to-voltage transducer systems that measure static as well as dynamic distances between the probe tip and the observed target. The general application is any requirement for a noncontacting displacement measurement. The typical use is for shaft position and vibration measurements on rotating and reciprocating machinery. They are configured for use with virtually any machine type including gas and steam turbines, compressors, pumps, centrifuges, electric motors and generators. The systems offer 80 mils (2 mm) of linear measuring range and comply with API 670 requirements. A system consists of a probe with integral coaxial cable, an extension cable, and Proximitor. All 7200 proximity transducer systems are compatible with 3300 and 9000 Monitoring Systems.
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 21747-075-01 Extension Cable 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.
Thermal Power Generation
Used in subcritical or supercritical coal-fired power units to transmit radial shaft vibration signals from the oil-film bearings of large high-pressure feedwater pumps, where the armor resists high-temperature oil mist outside the bearing housing.
Hydroelectric Power Generation
Routed outside the thrust and guide bearing housings of Francis or Kaplan hydro-generator sets to stably deliver axial displacement and shaft runout signals captured by the probe to the Proximitor enclosure.
Petroleum Refining
Deployed for transmitting high-speed rotor Keyphasor reference signals (speed) on large rich-gas compressors and flue gas turbines within heavy oil catalytic cracking units, preventing chemical vapor corrosion.
Natural Gas Pipelines
Applied in unmanned mainline booster stations for shaft displacement monitoring of gas turbine-driven centrifugal compressor trains, where the armored conduit protects exposed cables against rodent gnawing.
Nuclear Power Plants
Deployed on the roller/fluid-film bearing pedestals of main heater drain pumps or circulating water pumps on the conventional island side to provide a long-term, continuous vibration data link.
Coal Chemical & Ammonia Production
Used for thrust bearing position measurements in carbon dioxide and syngas compressor units, where the outer Tefzel jacket resists degradation from high-concentration ammonia vapors on-site.
Key precautions for Bently Nevada 21747-075-01, ensure all wiring is performed with the monitor channel power completely turned off, and tighten connectors moderately (typically finger-tight plus an additional 1/4 turn using a dedicated wrench) while strictly avoiding hot-plugging or over-torquing the coaxial center pins. This 7.5-meter cable features a characteristic impedance of 85 Ohms for the legacy 7200 system and must never be mixed with 50-Ohm system components like the 3300 XL series, as doing so will introduce severe measurement errors. During routing, strictly observe the minimum bending radius constraint of no less than 25.4 mm, and always seal exposed connectors outside the bearing housing with genuine connector protectors or self-fusing tape to prevent moisture or oil ingress from causing abnormal signal drifts.
Alternative Names
Alternative Names
21747 075 012I747-075-0I21747-O75-O12I747-O75-OI
Technical notes
Technical notes
The Bently Nevada 21747-075-01 is a stainless steel armored probe extension cable for the 7200 Series 5mm/8mm system. With a length of 7.5 meters, a low-loss 85-Ohm coaxial core, and Tefzel insulation, it pairs with a 1.5-meter integral lead probe to match a 9.0-meter total system length. It features high tensile strength, lube-oil resistance, and hazardous area certifications to guarantee stable displacement and vibration signal transmission in harsh industrial environments from -40°C to +93°C.
What exactly is the Bently Nevada 21747-075-01 device?
The 21747-075-01 is a Proximitor probe extension cable within the Bently Nevada 7200 Series 5mm and 8mm proximity transducer systems, used to link the physical probe to the Proximitor sensor.
How do you properly use cable products like the 21747-075-01?
To use it, connect one end to a 7200 probe and the other end to a 7200 Proximitor. Route it through cable trays or protective conduits, avoid sharp edges that could score the casing, and ensure coaxial connectors are tightly secured and sealed.
Can the 21747-075-01 be used directly in a 3300 XL 8mm system?
No, they cannot be directly mixed. The 21747-075-01 is manufactured for the legacy 7200 Series (85-Ohm impedance), whereas the 3300 XL system utilizes next-generation 50-Ohm cables. Mixing them blindly will result in severe measurement errors.
What is the impedance of the internal coaxial core of the 21747-075-01?
The standard characteristic impedance of its internal coaxial core is 85 Ohms (85 Ω), which perfectly matches the oscillating bridge circuitry of the 7200 Proximitor.
What is the minimum bending radius when routing the 21747-075-01 in the field?
For the 21747-075-01 cable with stainless steel armor, the recommended minimum bending radius is typically not less than 25.4 mm (1.0 inch). Sharp kinks are strictly prohibited.
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