Bently Nevada 3115-2800-190 Proximitor Transducer Product Specification
3115-2800-190 is an original eddy-current proximitor amplifier developed and manufactured by Bently Nevada under Baker Hughes, belonging to the classic 3115 legacy proximitor series built on eddy-current inductive measuring principle for non-contact rotating machinery condition monitoring. Serving as the core signal conditioning component of a complete proximity measuring assembly, this unit supplies high-frequency excitation voltage to matched proximity probe and extension cable combination, converting tiny clearance variations between probe tip and metallic rotating shaft into standardized linear analog voltage signals. Processed output signals are transmitted to Bently 3500 rack monitoring modules, local field indicators, PLC or DCS control systems to realize continuous online measurement of radial vibration, axial thrust displacement, rotational speed and keyphasor position of critical industrial rotating equipment. Every finished unit undergoes factory linearity calibration, high-pot insulation withstand test and cyclic thermal aging screening before delivery to maintain stable measurement accuracy under complicated industrial electromagnetic interference and fluctuating ambient temperature. Brand-new original products are produced in the United States with a standard 12-month factory warranty; professionally refurbished units go through full-parameter recalibration and continuous load aging test to restore original factory technical performance for field equipment spare replacement projects.
Description
Bently Nevada 3115-2800-190 Proximitor Transducer Product Specification
1. Product Overview
3115-2800-190 is an original eddy-current proximitor amplifier developed and manufactured by Bently Nevada under Baker Hughes, belonging to the classic 3115 legacy proximitor series built on eddy-current inductive measuring principle for non-contact rotating machinery condition monitoring. Serving as the core signal conditioning component of a complete proximity measuring assembly, this unit supplies high-frequency excitation voltage to matched proximity probe and extension cable combination, converting tiny clearance variations between probe tip and metallic rotating shaft into standardized linear analog voltage signals. Processed output signals are transmitted to Bently 3500 rack monitoring modules, local field indicators, PLC or DCS control systems to realize continuous online measurement of radial vibration, axial thrust displacement, rotational speed and keyphasor position of critical industrial rotating equipment. Every finished unit undergoes factory linearity calibration, high-pot insulation withstand test and cyclic thermal aging screening before delivery to maintain stable measurement accuracy under complicated industrial electromagnetic interference and fluctuating ambient temperature. Brand-new original products are produced in the United States with a standard 12-month factory warranty; professionally refurbished units go through full-parameter recalibration and continuous load aging test to restore original factory technical performance for field equipment spare replacement projects.
2. Model Coding Definition
The three-segment part number 3115-2800-190 divides into three independent specification definitions including product series, total calibrated system cable length and customized internal circuit configuration respectively. The prefix 3115 stands for Bently’s conventional proximitor platform with fixed oscillating and signal conditioning circuit designed for eddy-current impedance matching with designated proximity probes only. The middle numerical code 2800 specifies the total capacitance-calibrated overall length of the full measuring system consisting of probe plus complete extension cable at 2800 millimeters; internal circuit capacitance and impedance parameters are preset and locked according to this fixed total length, meaning random replacement of unmatched cable or incompatible probe will break the original impedance matching relation and trigger severe linearity deviation or complete signal failure of the whole measuring system. The suffix code 190 represents exclusive customized internal hardware configuration featuring fixed 18VDC nominal operating power circuit layout, dedicated internal filter component arrangement and exclusive terminal pin assignment for power supply, probe connection and signal output ports, which differentiates this model from other 3115 variants and prohibits arbitrary interchange without official factory circuit modification and recalibration.
3. Core Electrical Performance Specifications
This proximitor features rated 18VDC DC power input as defined by 190 customized circuit setting, with typical steady-state operating input current kept below 12mA under normal working load; when paired with intrinsic safety barriers for hazardous area installation, the supply voltage needs to be adjusted within -23VDC to -26VDC to avoid shrinkage of effective linear measuring range. Standard factory-calibrated sensitivity is fixed at 7.87V/mm or 200mV/mil matching its compatible proximity probe, delivering consistent linear voltage output across the full effective measuring stroke of 2mm nominal range. Built-in multi-stage EMI and RFI suppression circuitry effectively eliminates signal distortion caused by surrounding frequency converters, high-power motors and transient grid voltage surges from on-site power fluctuation. Its inherent frequency response ranges from 0Hz up to 10kHz, capable of capturing both slow static axial shaft drift and high-frequency dynamic radial vibration of high-speed rotating equipment. The signal output terminal permits direct connection to monitoring card terminals and passive signal isolators with maximum allowable external load resistance up to 10kΩ; integrated overvoltage and overcurrent protection components inside the circuit effectively prevent permanent component burnout under unexpected power surge or wiring short-circuit faults.
4. Mechanical Structure & Environmental Adaptability
The main housing of 3115-2800-190 proximitor adopts die-cast aluminum alloy sealed casing with integrated dual mounting structure supporting both standard DIN rail installation inside control cabinets and panel fixed installation on field local junction boxes without extra customized fixing accessories. Screw-type copper connection terminals are configured for power input, probe interface and analog signal output following exclusive pin definition corresponding to 190 circuit coding, simplifying field wiring operation and later maintenance disassembly works.
Permitted continuous working ambient temperature spans from -40℃ to +85℃ to satisfy ultra-low-temperature outdoor mounting and high-temperature layout near hot-running equipment across petrochemical, thermal power and metallurgical industries; safe product storage temperature covers -55℃ to +90℃ under dry non-condensing storage surroundings. Applicable relative operating humidity is limited from 5%RH to 90%RH with no internal condensation allowed to avoid internal circuit corrosion and insulation aging degradation. For installation sites above 1000 meters altitude, appropriate derating of continuous operating load is recommended to compensate reduced heat dissipation efficiency under thin atmospheric condition. The unit can sustain regular mechanical vibration ranging from 10Hz to 55Hz generated by adjacent running industrial machinery; long-term deployment in environments filled with corrosive chemical vapor, conductive metal dust and persistent oil mist is forbidden to extend the service life of internal precision electronic parts and casing sealing structure.
5. Application Scope & Routine Maintenance Guidance
Combined with matched 2800mm total-length proximity probe and extension cable assembly, 3115-2800-190 proximitor forms a complete non-contact eddy-current measuring system widely applied on steam turbines, centrifugal compressors, large feed water pumps, industrial blowers and generator rotors at thermal power stations, petrochemical refineries and coal chemical processing plants. It is mainly responsible for real-time online monitoring of rotor radial vibration magnitude, thrust bearing axial displacement value, rotating speed collection and keyphasor positioning detection, cooperating with Bently 3500 series monitoring rack to set equipment pre-alarm and emergency trip protection thresholds so as to avoid costly catastrophic mechanical breakdown triggered by abnormal rotor bouncing or excessive axial shifting.
For regular daily maintenance, periodic visual inspection on casing sealing integrity and terminal wiring tightness is mandatory to eliminate intermittent signal dropout and moisture penetration resulting from loose wiring; regular dust removal around the unit surface guarantees stable heat dissipation of internal precision circuit components. During breakdown replacement maintenance, only factory-calibrated probe and extension cable set with total system length of 2800mm can be adopted; mismatched cable dimension or non-compliant probe specification will destroy preset impedance matching and result in nonlinear measuring error or total signal loss. All aftermarket refurbished replacement proximitors complete full-range linearity calibration, long-hour load aging test and alternating high-low temperature shock inspection complying with original Bently factory standards before shipment to ensure measuring performance identical to brand-new original specifications.
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