Bently 991‑06‑50‑02‑00

Bently 991‑06‑50‑02‑00

Product Introduction: 991‑06‑50‑02‑00 is 991‑series integrated thrust‑position transmitter, integrating complete proximitor conditioning‑circuit. It works with 3300 NSv proximity‑probe and matched extension‑cable with total‑system electrical‑length 5 meters. Full‑scale axial‑displacement measuring‑range is ‑0.6 mm ~ +0.6 mm. It converts shaft axial‑thrust‑gap‑variation signal detected by eddy‑current‑probe into 4‑20 mA two‑wire loop‑output‑signal for DCS‑PLC system acquisition. It implements shaft thrust‑position monitoring without requirement for rack‑mount separate proximitor hardware, applied for axial‑thrust‑monitoring of various rotating‑machinery.

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Description

Bently 991‑06‑50‑02‑00

Technical Specifications:

  • Matching Transducer‑System: 3300 NSv probe plus extension‑cable, total electrical‑length 5 meters
  • Full‑Scale Measuring‑Range: ‑0.6 mm ~ +0.6 mm axial thrust displacement
  • Power‑Supply Mode: Two‑wire loop‑powered, +12 VDC ~ +35 VDC
  • Output Signal: 4‑20 mADC two‑wire loop
  • Loop‑Accuracy: ±1.5% full‑scale
  • Nominal Sensitivity: 7.87 V/mm
  • Frequency‑Response: 0 Hz ~ 10 kHz
  • Diagnostic Terminal: Prox‑Out gap‑voltage output terminal available
  • Maximum Allowable Loop‑Resistance: 1000 Ω @35 VDC
  • Mounting Form: 35 mm DIN‑rail clip‑mount or panel screw‑mount installation
  • Operating Temperature: ‑40 °C ~ +85 °C
  • Relative Humidity: 0‑95% RH non‑condensing
  • Startup‑Suppression Function: Output maintains NOT‑OK fault‑state within 2‑3 seconds after power‑on Functional Features:
  1. Built‑in complete proximitor‑function; NSv proximity‑probe system directly connects into transmitter input terminals without external proximitor hardware.
  2. Two‑wire loop‑power design, single‑pair cable completes both power‑supply feeding and 4‑20 mA signal‑transmission, reduces field‑instrument‑wiring workload.
  3. Accessible zero‑point and span potentiometers support on‑site field‑calibration adjustment.
  4. Dedicated test‑input pin enables loop‑function verification without physical NSv‑sensor connection.
  5. Sensor‑loop fault‑detection function locks output to defined fault‑current level when probe open‑circuit or short‑circuit fault occurs, prevents control‑system receiving false thrust‑position‑readings.
  6. Prox‑Out diagnostic‑terminal outputs raw gap‑voltage measurement value, convenient for field‑diagnosis of probe, connector and extension‑cable faults.
  7. Fully potted sealed internal‑structure, adapts high‑humidity industrial‑instrument‑cabinet environment. Application Scenarios: Axial thrust‑displacement monitoring for steam‑turbines, gas‑turbines, compressors and large centrifugal‑pump‑units; machinery‑renovation‑projects without full‑rack TSI‑protection‑hardware; OEM‑equipment supporting; hazardous‑area field‑thrust‑position‑signal conversion for control‑system input. Performance Parameters: Linear‑error ≤±1.5% full‑scale; fault‑response‑time less than 200 ms; excellent anti‑electromagnetic‑interference‑performance for industrial‑cabinet environment; low temperature‑drift across full operating‑temperature‑band. Material Composition: Flame‑retardant potting compound; multi‑layer printed‑circuit‑board; high‑precision signal‑processing integrated‑chips; gold‑plated wiring‑terminals; flame‑retardant engineering‑plastic housing; metal DIN‑rail spring‑locking clip; silicone sealing gaskets. Structural Characteristics: Standard DIN‑rail rectangular housing dimension; front‑side wiring‑terminal‑block; sealed calibration‑potentiometer access window; rear spring‑loaded DIN‑rail locking clip; housing surface printed with model‑number, thrust‑position full‑scale‑range and unique unit serial‑number. Working Principle: Internal high‑frequency‑excitation circuit delivers high‑frequency AC excitation‑signal to NSv proximity‑probe coil. Shaft axial thrust‑movement changes gap‑distance between probe tip and shaft thrust‑collar target‑surface. Gap‑change alters eddy‑current intensity on metal‑target‑surface and generates probe‑coil‑impedance‑variation. Transmitter internal circuit converts impedance‑variation into real‑time axial‑displacement engineering‑value and outputs corresponding 4‑20 mA loop‑current signal. Onboard fault‑diagnosis circuit continuously monitors sensor‑loop health‑condition. Prox‑Out terminal outputs raw DC gap‑voltage for maintenance‑inspection work. Installation Requirements:
  8. Fasten transmitter onto standard 35 mm DIN‑rail inside instrument‑cabinet, confirm rear spring‑locking clip fully engaged.
  9. Strictly follow two‑wire loop‑polarity requirement; AC‑voltage must never connect to loop‑power terminals.
  10. Total electrical‑length of NSv probe plus matched extension‑cable must keep exact 5‑meter value matching factory‑calibration setting.
  11. Route NSv sensor‑cable and 4‑20 mA output‑cable separately away from high‑power drive‑cables to avoid electromagnetic‑noise‑coupling.
  12. Perform zero‑point and span calibration operation via test‑input terminal after installation‑wiring completes. Usage Notes:
  13. Prohibit cutting, splicing or re‑solder modification for NSv probe and matched extension‑cable assembly. Modified electrical‑length destroys measurement‑linearity and factory‑calibration.
  14. Mark potentiometer position after finishing calibration; avoid arbitrary adjustment during normal‑unit‑operation‑period.
  15. Loop‑circuit resistance must not exceed maximum allowable‑value; excessive resistance produces 4‑20 mA output‑signal distortion.
  16. Regularly check Prox‑Out gap‑voltage reading during equipment‑inspection‑cycle, detect connector‑loosening and cable‑aging risk in advance.

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