Bently Nevada 3115-190 Proximitor Transducer Product Specification
3115-190 is an eddy-current proximitor signal conditioner manufactured by Bently Nevada (Baker Hughes Group), belonging to the classic 3115 series non-contact monitoring module built on eddy-current sensing technology. As the core signal conversion unit of the proximity measurement system, this proximitor supplies high-frequency excitation to matching proximity probe and extension cable, converts tiny clearance variations between probe tip and metallic rotating shaft into standard linear analog voltage signals. The processed output signal is transmitted to Bently 3500 monitoring racks, local indicators, PLC or DCS systems for continuous monitoring of shaft radial vibration, axial thrust displacement, rotational speed and keyphasor signal on critical rotating machinery such as compressors, steam turbines, blowers and generator units. Every finished product undergoes factory linearity calibration, high-pot withstand voltage test and thermal cycling aging inspection before delivery to guarantee stable measuring accuracy under complex industrial electromagnetic and temperature environments. New original units are US-manufactured with standard 12-month factory warranty, while professionally refurbished items complete full parameter recalibration and load aging test to restore original factory performance for equipment maintenance replacement.
Description
Bently Nevada 3115-190 Proximitor Transducer Product Specification
1. Product Overview
3115-190 is an eddy-current proximitor signal conditioner manufactured by Bently Nevada (Baker Hughes Group), belonging to the classic 3115 series non-contact monitoring module built on eddy-current sensing technology. As the core signal conversion unit of the proximity measurement system, this proximitor supplies high-frequency excitation to matching proximity probe and extension cable, converts tiny clearance variations between probe tip and metallic rotating shaft into standard linear analog voltage signals. The processed output signal is transmitted to Bently 3500 monitoring racks, local indicators, PLC or DCS systems for continuous monitoring of shaft radial vibration, axial thrust displacement, rotational speed and keyphasor signal on critical rotating machinery such as compressors, steam turbines, blowers and generator units. Every finished product undergoes factory linearity calibration, high-pot withstand voltage test and thermal cycling aging inspection before delivery to guarantee stable measuring accuracy under complex industrial electromagnetic and temperature environments. New original units are US-manufactured with standard 12-month factory warranty, while professionally refurbished items complete full parameter recalibration and load aging test to restore original factory performance for equipment maintenance replacement.
2. Model Code Definition
The two-segment part number 3115-190 consists of series identifier and customized circuit configuration code. The prefix 3115 represents Bently’s conventional standard proximitor platform with fixed internal oscillating and signal conditioning circuit designed for eddy-current impedance matching with designated proximity probes; this base series requires full system capacitance matching between proximitor, probe and extension cable to maintain rated linear sensitivity. The suffix code 190 stands for exclusive customized internal hardware setting including fixed rated operating power specification, optimized internal EMI filter layout and dedicated terminal pin assignment for power supply, probe port and signal output. This unique circuit configuration differentiates 3115-190 from other standard 3115 variants, and random interchange without factory recalibration will cause measuring nonlinearity or signal failure. The total calibrated cable length of the matched probe plus extension cable shall be confirmed separately according to on-site design configuration.
3. Core Electrical Performance Specifications
This proximitor accepts standard negative DC supply ranging from -17.5VDC to -26VDC with typical steady operating current below 12mA under normal working conditions. It is factory preset with fixed standard sensitivity of 7.87V/mm (200mV/mil) matched to its compatible proximity probe, featuring stable linear output within the rated effective measuring range of 2mm. Built-in multi-stage EMI/RFI suppression circuits effectively restrain signal distortion induced by surrounding inverters, high-power motors and transient grid voltage spikes. The frequency response covers 0Hz to 10kHz, which is capable of capturing slow static axial drift and high-frequency dynamic shaft vibration of various rotating equipment. The analog output terminal supports connection with monitoring modules and signal isolators with maximum permissible external load resistance up to 10kΩ; internal overvoltage and overcurrent protection components prevent permanent circuit damage from unexpected power surge or short-circuit faults. When used in hazardous explosion-proof areas, matched intrinsic safety barriers must be equipped with regulated supply voltage within specified range.
4. Mechanical Structure and Environmental Requirements
The main body adopts die-cast sealed aluminum alloy housing with dual mounting design for standard DIN rail installation inside control cabinets and panel mounting on field junction boxes without extra customized fixing accessories. Screw-type copper terminals are arranged per fixed pin definition corresponding to 190 specification for power input, probe connection and signal output, facilitating convenient field wiring and later maintenance disassembly.
Permitted continuous working ambient temperature ranges from -40°C to +85°C to adapt high-temperature nearby-equipment layout and low-temperature outdoor installation in petrochemical, power and metallurgical industries; storage temperature spans -55°C to +90°C under dry non-condensing environment. Applicable relative working humidity is 5%RH ~ 90%RH with no internal condensation allowed to avoid internal circuit corrosion and insulation degradation. For installation altitude above 1000 meters, proper load deration is recommended to compensate heat dissipation reduction caused by thinner air. The device withstands regular industrial vibration of 10Hz~55Hz; long-term operation in sites with corrosive gas, heavy oil mist and scattered conductive metal dust is strictly prohibited to prolong service life of internal precision electronic components and housing sealing.
5. Application Scope and Routine Maintenance Guidance
3115-190 proximitor forms a complete eddy-current monitoring system when paired with properly matched proximity probe and calibrated extension cable, widely applied on steam turbines, centrifugal compressors, feed pumps, industrial blowers and generator rotors of power plants, petrochemical refineries and coal chemical factories. It realizes real-time equipment condition monitoring, over-limit pre-alarm and emergency trip protection linkage to avoid severe mechanical faults caused by abnormal rotor vibration or axial displacement.
During regular maintenance, operators need periodic inspection of housing sealing condition and terminal fastening tightness to prevent loose wiring induced intermittent signal loss and moisture intrusion; regular surface dust cleaning maintains normal heat dissipation of internal circuits. For spare replacement, only probe and extension cable with factory-calibrated overall system length matching the original design shall be selected; mismatched cable capacitance or incompatible probe will break impedance matching and lead to measuring error or total signal failure. All aftermarket refurbished proximitors pass full linearity calibration, continuous load aging and high-low temperature alternating shock test following original Bently factory standards before delivery to keep performance consistent with original new products.
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