Bently Nevada 330704 3300 Eddy‑Current Proximity Transducer System

The Bently Nevada 330704 3300 is a standard eddy‑current proximity transducer system compatible with the Bently 3300 and 3500 machinery protection platforms. The full assembly includes probe, extension cable and oscillator‑demodulator, used to realize non‑contact measurement of shaft vibration, axial thrust position and rotor clearance of rotating machinery.

This sensor converts tiny metal shaft clearance changes into linear DC voltage signals and delivers stable measurement under high‑temperature, oil‑polluted and electromagnetic interference working conditions. It is a commonly stocked aftermarket spare part for turbomachinery monitoring cabinet maintenance, aged sensor replacement and on‑site system retrofitting in power and petrochemical plants.

Main Specifications

• Brand: Bently Nevada; Model:330704 3300; Type:Eddy‑Current Proximity Transducer Assembly
• System composition:Probe, extension cable and oscillator‑demodulator unit
• Measurement principle:Non‑contact eddy‑current induction for metal shaft displacement detection
• Output:Linear DC analog voltage, matched with Bently 3300 and 3500 series monitoring modules
• Function:Shaft radial vibration measurement, thrust position monitoring, rotor gap and eccentricity detection
• Feature:High measurement linearity, stable temperature performance, strong anti‑interference capability
• Operating Environment:Wide working temperature range, adapted to turbine and compressor harsh field environment
• Certifications:Industrial certification for turbomachinery online monitoring and machine protection systems

Core Functions

• Real‑time non‑contact acquisition of radial vibration and axial displacement data of rotating metal shafts.
• Convert mechanical clearance variation into standard analog voltage signals and send data to rack monitor modules.
• Maintain stable detection under high‑temperature, oil mist and strong electromagnetic interference industrial sites.
• Provide accurate displacement data for the 3500 protection system to trigger vibration alarms and safety interlock actions.
• Capture rotor eccentricity and thrust bearing wear trends to realize early warning of potential mechanical failures.
• Complete supporting sensor solution for overhaul, spare replacement and technical upgrading of original Bently monitoring systems.

Application Scenarios

• Shaft vibration and position sensing unit for Bently Nevada 3300 and 3500 turbomachinery protection racks.
• Critical spare sensor components for steam turbine, gas turbine and centrifugal compressor monitoring cabinets.
• Retrofit and spare replacement for aging proximity probes and signal cables of legacy monitoring systems.
• Online condition monitoring of large rotating equipment in power plants, petrochemical and energy industries.
• Thrust position supervision and shaft vibration protection for heavy‑duty industrial rotating machinery.

• Global aftermarket spare supply for maintenance teams maintaining Bently Nevada turbomachinery monitoring hardware.