Technical Specifications Applicable Probe: Bently 3308 series 8mm high temperature proximity probe Power Supply: -24V DC Output Signal: Linear gap voltage signal Operating Temperature: -40℃ ~ +70℃ Mounting: Bracket mounting Housing: Cast aluminum alloy shielding housing
Functional Features Special excitation circuit for 3308 series high temperature 8mm eddy current probe. Convert probe impedance variation into stable linear analog voltage output. Built-in self-diagnosis to detect probe cable open circuit and short circuit. Aluminum alloy shielding housing reduces electromagnetic interference in industrial site. Screw terminal structure for convenient field wiring and inspection. Stable long-time continuous operation performance.
Application Scenarios Preamplifier for 3308 series high temperature eddy current probe measuring loop. High temperature section shaft vibration monitoring of steam turbine and gas turbine. Axial thrust displacement measurement of high temperature centrifugal compressor. Power plant high temperature rotating machinery online protection system. Petrochemical plant high temperature critical equipment condition monitoring.
Structural Characteristics Cast aluminum alloy metal housing with mounting lugs. Internal PCB integrated dedicated oscillator, signal conditioning and fault diagnosis circuit. Screw terminal block for power supply, probe signal and output signal. Cable entry openings for field wiring. Shielded metal housing structure.
Working Principle Dedicated oscillator circuit generates matched high-frequency excitation signal for 3308 high temperature probe coil. Eddy current induced on metal rotor surface changes coil impedance with gap distance. Signal conditioning circuit converts impedance variation into linear voltage proportional to gap value. Built-in diagnostic circuit monitors measuring loop health continuously.
Installation Requirements Fix proximitor to rigid mounting bracket, stay away from high temperature heat source. Connect high temperature probe extension cable to signal terminals following wiring diagram. Connect -24V DC power supply without polarity reversal. Ground aluminum housing to protective ground bus. Separate signal cables from high voltage power cables. Check signal output and diagnostic status after power on.
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