Bently Nevada 3115-2800-300 Proximitor Transducer Product Specification
3115-2800-300 is an original eddy current proximitor amplifier manufactured by Bently Nevada under Baker Hughes, belonging to classic 3115 legacy proximitor series engineered for non-contact machinery condition monitoring based on eddy current induction principle. Functioning as the core signal conditioning unit of complete proximity measurement system, this device supplies high-frequency excitation power to matched eddy current probe and extension cable assembly, converts tiny clearance fluctuation between probe tip and rotating metal rotor into standardized linear analog voltage output, then transmits processed signal to Bently 3500 rack monitoring modules, local display instruments or third-party PLC and DCS control systems for real-time vibration, axial displacement, rotational speed and keyphasor phase monitoring of critical rotating equipment. All finished units undergo strict factory linearity calibration, high-pot insulation withstand test and long-term thermal cycling aging before delivery to guarantee consistent measuring precision amid fluctuating field temperature and electromagnetic interference. Brand-new original products are fabricated in United States with standard 12-month factory warranty, while professionally refurbished variants complete full parameter recalibration and no-load aging test to restore original factory technical indexes for field equipment maintenance replacement projects.
Description
Bently Nevada 3115-2800-300 Proximitor Transducer Product Specification
1. Product Overview
3115-2800-300 is an original eddy current proximitor amplifier manufactured by Bently Nevada under Baker Hughes, belonging to classic 3115 legacy proximitor series engineered for non-contact machinery condition monitoring based on eddy current induction principle. Functioning as the core signal conditioning unit of complete proximity measurement system, this device supplies high-frequency excitation power to matched eddy current probe and extension cable assembly, converts tiny clearance fluctuation between probe tip and rotating metal rotor into standardized linear analog voltage output, then transmits processed signal to Bently 3500 rack monitoring modules, local display instruments or third-party PLC and DCS control systems for real-time vibration, axial displacement, rotational speed and keyphasor phase monitoring of critical rotating equipment. All finished units undergo strict factory linearity calibration, high-pot insulation withstand test and long-term thermal cycling aging before delivery to guarantee consistent measuring precision amid fluctuating field temperature and electromagnetic interference. Brand-new original products are fabricated in United States with standard 12-month factory warranty, while professionally refurbished variants complete full parameter recalibration and no-load aging test to restore original factory technical indexes for field equipment maintenance replacement projects.
2. Model Code Definition
The three-segment numerical coding 3115-2800-300 separately defines product series classification, total matched system cable length and customized internal circuit configuration. The prefix code 3115 represents classic legacy proximitor platform developed by Bently Nevada, featuring fixed internal oscillating circuit optimized for standard eddy current probe impedance matching and compatible with designated specification proximity sensor only. Middle numeric 2800 specifies the total capacitance-calibrated length of entire measuring system combining probe body plus full extension cable at 2800 millimeters; the internal circuit capacitance and impedance parameters are solidified according to this fixed overall length, which forbids random replacement of unmatched cable or probe otherwise leading to severe linearity drift and measuring failure caused by mismatched distributed capacitance. The trailing group 300 stands for exclusive customized internal hardware layout including fixed rated operating power circuit, customized signal filtering components and dedicated terminal pin assignment for power and signal wiring, distinguishing this specification from other standard 3115 series variants without authorized factory circuit modification and recalibration.
3. Core Electrical Performance Specifications
This proximitor accepts rated negative DC power supply ranging from -17.5VDC to -26VDC with typical steady operating input current controlled below 12mA under normal working status; when installed with intrinsic safety barrier for hazardous area application, input supply shall maintain between -23VDC and -26VDC to avoid effective linear range shrinkage. Designed with fixed standard sensitivity matching corresponding paired probe at 7.87V/mm (200mV/mil), it delivers stable linear output within full effective measuring stroke of 2mm standard range, and built-in multi-stage EMI/RFI suppression circuit effectively eliminates signal distortion triggered by surrounding frequency converter, high-power motor and industrial grid transient surge interference. Its available effective frequency response covers 0Hz to 10kHz to capture both slow static axial drift and high-frequency dynamic shaft vibration of rotating machinery. The output terminal supports direct connection to monitoring card terminals and passive signal isolators with maximum allowable external load resistance up to 10kΩ; internal integrated overvoltage and overcurrent protection components prevent permanent circuit burnout under abnormal power surge and short-circuit wiring fault.
4. Mechanical Structure & Environmental Adaptability
The main casing of 3115-2800-300 proximitor adopts die-cast aluminum alloy sealed housing with dustproof and splash-proof structural design, realizing dual installation compatibility for standard DIN rail mounting inside control cabinet and panel fixed installation on field junction box without extra customized fixing accessories. Standard screw-type copper terminals are configured for power input, probe connection and signal output ports following fixed pin definition corresponding to 300 customized coding specification, facilitating convenient on-site wiring and later maintenance disassembly operation.
Permissible continuous working ambient temperature spans from -40℃ up to +85℃, adapting to ultra-low temperature outdoor layout and high-temperature nearby equipment installation across petrochemical, thermal power and metallurgical industries; product safe storage temperature ranges from -55℃ to +90℃ under dry non-condensing storage environment. Applicable relative working humidity is limited between 5%RH and 90%RH with no internal condensation allowed to avoid internal circuit corrosion and insulation degradation. When mounted above 1000 meters altitude, proper reduction of continuous working load is recommended to compensate heat dissipation decline caused by thin air condition. The unit can withstand regular mechanical vibration from 10Hz to 55Hz generated by running industrial equipment; long-term deployment in working site filled with corrosive chemical vapor, conductive metal dust and persistent oil mist is prohibited to extend internal electronic component service lifespan.
5. Application Scope & Routine Maintenance Guidance
3115-2800-300 proximitor composes complete non-contact eddy current measuring system together with matched fixed-length 2800mm probe and extension cable set, widely applied on steam turbines, centrifugal compressors, large feed water pumps, industrial blowers and generator rotors in thermal power plants, petrochemical refining plants and coal chemical facilities. It mainly undertakes real-time monitoring of rotor radial vibration value, thrust bearing axial displacement, rotating speed pickup and keyphasor position detection, cooperating with Bently 3500 series monitoring rack to set equipment over-limit pre-alarm and emergency trip protection threshold to prevent catastrophic mechanical breakdown induced by abnormal rotor bouncing and axial shifting.
During regular daily maintenance, periodic visual inspection of housing sealing integrity and terminal wiring tightness is required to eliminate intermittent signal loss and moisture ingress caused by loose wiring; regular dust cleaning around device surface keeps normal heat dissipation of internal precision circuit. For breakdown replacement maintenance, only full-set matched probe and extension cable calibrated for total 2800mm system length shall be adopted; mismatched cable dimension or incompatible probe specification will break original impedance matching relation and result in non-linear measuring error or complete signal interruption. All aftermarket replacement refurbished proximitors pass full-range linearity calibration, load aging test and alternating high-low temperature shock inspection in strict accordance with original Bently factory standards before delivery to ensure measuring performance consistent with brand-new original specification.
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