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The18745-03 is a proximitor sensor module built for industrial condition monitoring and machinery protection systems. Serving as a core hardware component within Bently Nevada’s 7200 series, this device facilitates non-contact displacement and vibration measurements of shafts by converting the physical gap between a target metal surface and the sensor tip into an electrical signal output. It requires interlinking with corresponding proximity probes and extension cables to deliver standard signals to external machinery monitoring panels.
The output signal complies with API 670 standards and interfaces directly with downstream monitoring chassis
The temperature-stabilized circuit maintains a stable scale factor across wide ambient temperatures from -40°C to +85°C
It converts the physical gap between the probe tip and metal shaft directly into a proportional voltage signal of 200 mV/mil
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 an accurate, non-contacting displacement measurement. However, the most common use is for shaft position and vibration measurements on rotating and reciprocating machinery. They are designed 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 are compatible with API 670 requirements. As a core component of this hardware setup, the 18745-03 Proximitor Sensor works seamlessly within the complete system, which consists of a probe with integral coaxial cable, an extension cable, and the Proximitor itself. All 7200 proximity transducer systems are fully 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 18745-03 Proximitor Sensor 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.
Oil & Gas
Continuously monitoring the radial vibration and axial displacement of main shafts in large centrifugal compressors at refineries and LNG plants.
Thermal Power
Detecting static clearance and dynamic eccentricity of rotor bearings in heavy-duty gas and steam turbine generator sets to prevent mechanical rubbing.
Petrochemical
Measuring the relative displacement of crosshead sliders and piston rod drop in ethylene plants and high-pressure polyethylene reciprocating compressors.
Hydroelectric Power
Tracking the shaft runout (radial orbit) and thrust bearing axial deformation of large-diameter main shafts in hydro-generator sets in real time.
Metallurgy & Steel
Capturing the vibration response of rotating shafts under extremely high loads on large high-power blowers and heavy-duty gearboxes in hot and cold rolling lines.
Air Separation
Performing millisecond-level precise shaft position measurements on rotors spinning up to tens of thousands of RPM in high-speed turboexpanders within cryogenic air separation units.
When using the 18745-03 Proximitor, users must ensure it is paired with a 7200 series 5mm or 8mm probe and an extension cable to form a system with a total length of exactly 5 meters, as mismatched lengths will systematically skew the calibrated 200 mV/mil scale factor.
When mounting the 18745-03 Proximitor, its aluminum housing must be electrically isolated from the machine ground or control cabinet panel using an insulation base to prevent ground loop interference. Additionally, because this assembly runs on a negative DC supply voltage (-24 VDC), technicians must carefully verify the wire connections on the three dedicated terminal posts (VT, COM, and OUT) and strictly avoid adjusting physical wiring while the system is energized.
Alternative Names
Alternative Names
18745 03I8745-0318745-O3I8745-O3
Technical notes
Technical notes
Operating the Bently Nevada 18745-03 demands an appropriately paired 5mm/8mm transducer and extension cable assembly to keep its 200mV/mil calibrated linear output intact. Additionally, engineers should validate all 3-core shielded wiring terminations to bypass any potential signal attenuation triggered by high-frequency operational harmonics.
The 18745-03 is a Proximitor Sensor that serves as a core electrical component within a non-contacting gap-to-voltage proximity transducer system.
What is the primary industrial use of the 18745-03?
It is primarily used for shaft position and shaft vibration measurements on rotating and reciprocating machinery.
What role does the 18745-03 play within the electrical system?
As a core component, it works seamlessly within the complete measurement hardware setup alongside cables and probes to maintain signal flow.
What physical metrics can the 18745-03 measure?
It measures both static and dynamic distances between the sensor probe tip and the observed target object.
What is the basic operational principle of the 18745-03?
It operates based on a non-contacting measurement principle, capturing gap changes between the probe and a target to convert them into voltage signals.
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