Bently Nevada 2155/00 Proximitor Preamplifier Product Specification
2155/00 is factory pre-calibrated standalone proximitor preamplifier belonging to Bently Nevada classic 7200 series eddy current transducer system, specially matched for standard 8 mm diameter proximity probe assemblies. It acts as core signal conditioning unit between field-mounted proximity probes and cabinet-located 7200 / 3500 rack monitoring modules, converting tiny clearance variation between probe tip and conductive metallic target into stable linear DC analog voltage output. Processed analog signals are transmitted to backend monitor boards to implement continuous real-time measurement of rotating equipment radial shaft vibration and small-range axial displacement, widely used on steam turbines, gas turbines, centrifugal compressors and large generator units in power, petrochemical and metallurgical industries for machinery over-limit alarm and emergency shutdown interlock protection. Every finished unit completes linearity calibration, insulation withstand test and high-low temperature cyclic aging screening before factory delivery to guarantee stable conversion precision under harsh on-site environments with high ambient temperature, dense lubricant oil mist and complicated industrial electromagnetic interference near bearing housings.
Description
Bently Nevada 2155/00 Proximitor Preamplifier Product Specification
1. Product Overview
2155/00 is factory pre-calibrated standalone proximitor preamplifier belonging to Bently Nevada classic 7200 series eddy current transducer system, specially matched for standard 8 mm diameter proximity probe assemblies. It acts as core signal conditioning unit between field-mounted proximity probes and cabinet-located 7200 / 3500 rack monitoring modules, converting tiny clearance variation between probe tip and conductive metallic target into stable linear DC analog voltage output. Processed analog signals are transmitted to backend monitor boards to implement continuous real-time measurement of rotating equipment radial shaft vibration and small-range axial displacement, widely used on steam turbines, gas turbines, centrifugal compressors and large generator units in power, petrochemical and metallurgical industries for machinery over-limit alarm and emergency shutdown interlock protection. Every finished unit completes linearity calibration, insulation withstand test and high-low temperature cyclic aging screening before factory delivery to guarantee stable conversion precision under harsh on-site environments with high ambient temperature, dense lubricant oil mist and complicated industrial electromagnetic interference near bearing housings.
2. Part Number Definition Breakdown
2155 is the base model code for standard 8mm dedicated proximitor platform of Bently 7200 series; suffix /00 defines fixed internal circuit layout, locked factory calibration parameters, terminal definition and standard cast metal enclosure version. Models with different suffix markings carry inconsistent preset calibration coefficients and internal hardware configuration, which cannot be directly interchanged on-site without full-loop professional recalibration. Improper random substitution will cause obvious measurement drift and false protection action of the entire monitoring channel.
3. Core Functional Characteristics
Equipped with high-temperature resistant high-frequency oscillating circuit, this proximitor provides consistent high-frequency excitation source for matched 8mm eddy current probes and linearly translates physical gap fluctuation into proportional DC voltage within rated effective linear span. Built-in multi-stage filtering network effectively suppresses power frequency clutter and high-frequency interference introduced by surrounding variable frequency drives and high-current power cables to avoid signal distortion during long-distance transmission of factory-calibrated extension cables. Fully sealed cast aluminum metal housing features outstanding dust-proof, oil-proof and anti-vibration performance, enabling compact installation inside field junction boxes close to high-temperature bearing compartments and turbine casings. Integrated open-circuit and short-circuit fault diagnosis function reflects abnormal field wiring state via obvious output voltage offset value to simplify routine on-site troubleshooting work. Only when matched with original certified 8mm proximity probe and designated calibrated extension cable can the complete transducer system retain original factory fixed calibration data; non-standard self-matched cables will permanently invalidate pre-set calibration parameters.
4. Electrical and Metrological Specifications
The proximitor accepts regulated negative DC supply ranging from -17.5 VDC to -26 VDC, with typical field operating voltage at -24 VDC sourced from rack monitoring power output or dedicated regulated DC power unit. Factory locked fixed sensitivity is 7.87 V/mm (200 mV/mil) for standard 8mm probes, with full-range linearity tolerance controlled within ±5% conforming to API 670 industry standard. Valid linear measuring range spans from 1.27 mm to 9.27 mm for regular vibration and small-stroke displacement monitoring. Output signal consists of DC component for static position reading and AC component for dynamic vibration collection, with frequency response covering DC up to 10 kHz to satisfy both slow thermal drift monitoring and high-frequency dynamic vibration signal acquisition requirements. Standard screw-type terminal block is reserved for orderly wiring of power supply line, probe input cable and analog signal output cable respectively.
5. Environmental Working Parameters
Continuous permissible operating ambient temperature ranges from -40°C to +121°C to adapt high-temperature installation near heated bearing housings and turbine casings. Spare storage temperature is maintained between -55°C and +85°C under dry non-condensing storage environment; applicable working relative humidity is 5%RH~95%RH, and internal dew condensation inside metal enclosure is strictly forbidden to prevent internal circuit corrosion and short-circuit faults. The unit can withstand routine industrial running vibration of 10 Hz ~ 2 kHz generated by adjacent rotating equipment. Long-term continuous exposure to strong corrosive gas and persistent hot steam immersion is prohibited to extend service life of internal electronic components. For installation above 1000 meters altitude, shorten periodic inspection cycle appropriately.
6. Installation and Routine Maintenance Guidance
Pre-reserved mounting holes on metal casing enable rigid bolt fastening onto flat junction box base or customized installation bracket. During field wiring construction, separate signal cables away from high-current AC power wiring to reduce cross electromagnetic coupling interference and fully tighten all terminal fixing screws to eliminate intermittent signal fluctuation from poor contact. In regular maintenance cycles, periodically inspect casing integrity, terminal fastening condition and oil accumulation around installation position. When replacement is needed after unit failure, only identical full part number 2155/00 spare part is allowed for direct swap. All replacement preamplifiers complete full electrical performance testing and alternating temperature aging screening before factory shipment to ensure complete interchangeability during equipment overhaul.
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