Bently Nevada 18736-01 Proximitor Detailed Product Specification
18736-01 is a factory pre-calibrated eddy-current proximitor belonging to Bently Nevada classic 7200 series transducer lineup, manufactured in the United States as core signal conditioning component for non-contacting proximity measurement systems composed of proximity probe, matched coaxial extension cable and proximitor unit. Different from fixed single-spec 18745 series models, this unit supports dual compatibility with standard 5mm and 8mm 3300XL proximity probes after standardized factory calibration, serving as a versatile universal signal converter for rotating machinery monitoring. Based on eddy-current induction measurement principle, it converts variable clearance between conductive rotating shaft target and probe tip into linear negative DC analog output voltage, and transmits processed measuring signals to 7200 rack monitoring modules, local field indicators as well as plant DCS and PLC control systems to implement continuous real-time tracking of radial shaft vibration, axial thrust displacement and rotor differential expansion, fully complying with API 670 international turbomachinery protection specification widely adopted across global process industries. No extra field hardware modification is needed to switch between 5mm and 8mm matched probe assemblies within calibrated parameter scope.
Description
Bently Nevada 18736-01 Proximitor Detailed Product Specification
1. Product Overview
18736-01 is a factory pre-calibrated eddy-current proximitor belonging to Bently Nevada classic 7200 series transducer lineup, manufactured in the United States as core signal conditioning component for non-contacting proximity measurement systems composed of proximity probe, matched coaxial extension cable and proximitor unit. Different from fixed single-spec 18745 series models, this unit supports dual compatibility with standard 5mm and 8mm 3300XL proximity probes after standardized factory calibration, serving as a versatile universal signal converter for rotating machinery monitoring. Based on eddy-current induction measurement principle, it converts variable clearance between conductive rotating shaft target and probe tip into linear negative DC analog output voltage, and transmits processed measuring signals to 7200 rack monitoring modules, local field indicators as well as plant DCS and PLC control systems to implement continuous real-time tracking of radial shaft vibration, axial thrust displacement and rotor differential expansion, fully complying with API 670 international turbomachinery protection specification widely adopted across global process industries. No extra field hardware modification is needed to switch between 5mm and 8mm matched probe assemblies within calibrated parameter scope.
2. Matching Probe and Cable Configuration Definition
The 18736-01 receives dual-range factory calibration to adapt both 5mm-diameter 330101 series and 8mm-diameter 330104 series proximity probes paired with corresponding 330130 coaxial extension cables; total combined length of probe integrated cable plus extension cable is pre-defined and fixed during factory calibration, with mainstream preset full-loop length options of 5 meters and 9 meters for on-site installation. Random field cutting, arbitrary replacement or mismatched combination of non-calibrated probes and cables will alter overall circuit capacitance value, triggering sensitivity shift and linearity deviation to degrade measurement precision severely. The interconnection between probe tail and extension cable uses gold-plated locking coaxial connectors featuring excellent anti-corrosion, moisture-proof and low signal attenuation performance, adapting to moderately humid and slightly corrosive control cabinet environment inside power plants and petrochemical facilities. Field parameter fine-tuning is available to switch calibration mode between 5mm and 8mm matching specifications without returning to factory for recalibration, which marks its core advantage over single-calibration 18745-01/03/04 variants.
3. Core Electrical Performance Parameters
Nominal rated input power supply ranges from -18VDC to -24VDC negative DC voltage, with -24VDC recommended as standard operating input voltage; optimized low power consumption circuit design effectively restrains excessive internal heat accumulation during long-term uninterrupted continuous operation. Standard factory-set calibration sensitivity remains fixed at 200mV/mil, equal to 7.87V per millimeter of gap change between probe tip and target metal surface, consistent with unified parameter criteria of full 7200 series proximitor products. Valid linear measurement coverage is split corresponding to matched probe specifications: around 80 mils (2mm) effective clearance range for 5mm probes and extended calibrated span for standard 8mm probe matching, with full-scale linearity error strictly controlled below 1% of total measuring range to guarantee high-precision detection of static shaft position offset and dynamic high-frequency vibration fluctuation. Its frequency response bandwidth spans from DC (0Hz) up to 10kHz, enabling synchronous acquisition of steady-state axial displacement data, rotor radial vibration, shaft eccentricity and Keyphasor phase reference pulse signals without waveform distortion or amplitude loss.
Output DC voltage varies linearly from near 0V to -24VDC following full calibrated clearance variation; dedicated test terminals are reserved on terminal block to facilitate periodic field calibration and on-site fault diagnosis without mandatory production shutdown. Integrated multi-layer protection circuits including reverse polarity prevention, overvoltage clamping, transient surge suppression and output short-circuit protection shield internal PCB components from damage caused by incorrect field wiring and instantaneous power grid fluctuation.
4. Mechanical Structure and Mounting Specification
Constructed with high-strength blue flame-retardant industrial plastic housing, 18736-01 shares consistent outer outline dimension with mainstream 18745 DIN rail-mounted products: 81.3mm in height × 61.2mm in width × 63.5mm in depth, net weight approximately 225 grams, allowing direct interchangeable spare replacement with 18745 serial models under identical DIN installation footprint without cabinet mechanical modification. One single power status LED indicator is arranged on front panel for intuitive energization inspection; lower terminal area is divided into three independent screw wiring ports with clear printed marking for power supply input, probe coaxial signal input and analog signal output separately to lower field wiring error probability. All internal circuit boards receive full conformal coating treatment to resist dust accumulation, ambient dampness and mild corrosive industrial gas erosion inside control cabinets, with enclosure protection grade IP20 limiting installation only to indoor cabinet environment and prohibiting open-air splash-prone outdoor application. Two optional mounting solutions are supported: standard DIN top-hat rail snap-on installation or direct fixed panel mounting via screw fasteners.
5. Environmental Operating Specifications
Continuous rated working ambient temperature scope covers -20℃ ~ +70℃ for regular indoor cabinet installation; short-time intermittent overload operation permits transient environment temperature ranging from -40℃ up to +85℃ to adapt temporary high-temperature layout near hot-running equipment casings. Storage and transportation temperature range extends from -40℃ ~ +125℃ to satisfy cross-region spare part long-distance logistics delivery and long-term warehouse storage under extreme cold or high-temperature climate conditions. Permissible operating relative humidity is controlled within 5%~95% non-condensing condition to eliminate internal short-circuit risk induced by cabinet dew and condensed moisture attached on electronic components.
6. Industrial Application Coverage
Benefiting from dual-probe compatible design, 18736-01 is widely deployed for critical equipment monitoring in thermal power stations, petrochemical refining plants, natural gas compression stations and metallurgical production lines, covering medium and large steam turbines, gas turbines, centrifugal compressors, large induced draft fans, feedwater pumps and auxiliary generator sets. It continuously monitors core operational indicators including radial shaft vibration, rotor axial thrust position and differential expansion to capture early hidden faults such as shaft rub impact, bearing fatigue wear and rotor alignment deviation. Once measured data exceeds pre-set alarm or trip threshold, connected rack monitoring system triggers local audible-visual alarm or safety interlock shutdown to prevent catastrophic damage of high-value core production equipment. When paired with Keyphasor pickup sensors, this proximitor also provides rotational speed and phase reference data for post-failure spectrum analysis and long-term equipment predictive maintenance trending recording.
7. Certification and Warranty Terms
Genuine original 18736-01 complies with Bently Nevada internal factory quality control standards, CE electrical safety certification and API 670 global machinery protection requirements; factory original dual-spec calibration certificate can be supplied upon customer request for incoming quality inspection formalities. When installed, wired and operated strictly within specified electrical and environmental working limits without artificial physical damage, reverse power connection or overvoltage misuse, the product is covered under twelve-month limited manufacturer warranty starting from goods delivery date, covering inherent manufacturing defects of internal electronic components and circuit assembly. Customized ATEX Class I Division 2 explosion-proof variant is available via pre-order for installation inside classified hazardous explosive gas industrial areas.
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