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18745-04
Proximitor Sensor
In Stock
Ships by Friday, August 21
Fast Shipping Available
Product Describe：
Non-contact eddy-current proximity sensor
Industrial-grade casting resistant to oil
dirt, moisture, and chemical contaminants
Rugged cast aluminum with a corrosion-resistant coating
The 18745-04 is a high-precision Proximitor Sensor from the legacy 7200 series product line. It serves as the active signal-conditioning hardware within noncontacting, gap-to-voltage transducer systems, converting raw eddy-current inputs into calibrated analog voltage signals. This specific model accommodates 5 mm and 8 mm 7200 series proximity probes and extension cables for a 9-meter total system length, capturing static displacement (position) as well as dynamic distances (vibration) between the probe tip and the observed conductive target.
Stable Frequency Response Range from 0 Hz (DC) to 10 kHz
Excellent Compatibility with Multi-Generation Legacy Monitoring Architectures
Harsh Environment Durability and Full API 670 Standard Compliance
The primary installation setup centers on shaft position and vibration measurements on high-speed rotating and reciprocating machinery. The hardware integrates with multiple machine configurations, including gas and steam turbines, compressors, pumps, centrifuges, electric motors, and generators. Operating as a complete loops-matching network, the system delivers 80 mils (2 mm) of linear measuring range and complies with American Petroleum Institute (API) Standard 670 requirements. A complete operating loop consists of the sensor probe with an integral coaxial cable, a matched extension cable, and the 18745-04 Proximitor unit. Physically built to support multi-generation infrastructure, this Proximitor ensures backward and forward connectivity, making all 7200 proximity transducer systems fully compatible with Bently Nevada 3300 and 9000 Monitoring Systems. The assembly mounts via standard 35mm DIN-rail configurations or a 2.00” x 2.00” panel footprint, maintaining clear output signal traits under severe machinery enclosure environments.
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 18745-04 Proximitor Sensor Module 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.
Fossil Fuel Power Generation
Continuously monitors the axial displacement of high/low-pressure steam turbine rotors to prevent catastrophic rubbing between stationary and rotating parts caused by uneven thermal expansion or thrust bearing wear.
Petroleum Refining & Petrochemical
Captures high-frequency radial vibration waveforms of the compressor main shaft in real-time for early diagnosis of aerodynamic and hydrodynamic faults, such as rotor unbalance, misalignment, and oil whirl.
Nuclear Power Generation
Monitors the orbit trajectory of the main pump shaft system under extremely harsh environments to ensure the structural integrity of the continuous reactor coolant circulation loop.
Iron & Steel Metallurgy
Collects speed and Keyphasor signals from the blast furnace air supply shafting, while monitoring relative vibration to prevent severe equipment damage from surging caused by aerodynamic excitation.
Air Separation Industry
Monitors the radial runout of pinions inside high-speed integrally geared compressors, ensuring the high-efficiency operation of oxygen and nitrogen liquefaction separation loops.
Mining & Mineral Processing
Monitors the bearing housing displacement of high-speed input and intermediate shafts, preventing gear tooth breakage or bearing burnout under excessive ore impact loads.
The aluminum casing must be completely electrically isolated from the field machine ground and securely fixed on insulated rails or inside a dedicated Proximitor housing to prevent ground loop interference. Keep the coaxial connector entirely free from oil and moisture, using a dedicated torque wrench during tightening to avoid stripping the threads. It must be paired strictly with a 7200 Series 5mm probe and a 9-meter total length system cable; mixing it with probes from other families like the 3300 XL is forbidden, and live wiring in the field is prohibited to ensure the safety of the intrinsically safe loop.
Alternative Names
Alternative Names
18745 0418745-O4I8745-04I8745-O4
Technical notes
Technical notes
The Bently Nevada 18745-04 is a 7200 series 5mm/8mm proximity probe sensor developed for non-contact axis vibration, axial displacement, and speed measurement. Calibrated for a 9.0-meter system length, it transforms high-frequency signals into standard linear DC voltages at a scale factor of 200 mV/mil. Featuring high electromagnetic interference immunity and compliance with API 670 standards, this sensor ensures stable and reliable condition monitoring for critical rotating machinery like steam turbines and compressors in harsh industrial environments.
The 18745-04 is a 7200 Series 5mm proximity Proximitor sensor manufactured by Bently Nevada, utilized to convert high-frequency gap variations at the probe tip into a proportional voltage signal.
What core engineering role does 18745-04 play in rotating machinery monitoring?
It functions as the signal conditioning core in the proximity transducer loop, providing high-frequency excitation to the field probe and demodulating AC/DC voltage outputs that reflect actual shaft vibration or axial position.
How to properly wire and use the 18745-04?
Connect it to the 9-meter system cable assembly (including the probe) via the coaxial connector, and connect the -24V DC power, Common (COM), and Signal Output (OUT) to the monitoring cabinet at the terminal block side.
Can the 18745-04 be connected directly to a 3300 XL Series 8mm probe?
No. The 18745-04 is specifically for the 7200 Series 5mm probe system. It does not match the impedance and frequency characteristics of a 3300 XL Series 8mm probe, and mixing them will cause severe signal distortion.
In routine maintenance, what should be noticed regarding the coaxial connector on the 18745-04?
The threads and center contacts of the coaxial connector must be kept absolutely dry and clean, preventing oil and moisture from entering. During physical tightening, a dedicated torque wrench must be used to prevent excessive force from stripping the threads.
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