Bently 990‑05‑70‑02‑00

Bently 990‑05‑70‑02‑00

Product Introduction: 990‑05‑70‑02‑00 belongs to Bently 990‑series integrated NSv vibration‑transmitter. It embeds complete proximitor conditioning‑circuit inside DIN‑rail‑mount housing. It works exclusively with 3300 NSv proximity‑probe plus matched extension‑cable for total‑system electrical‑length 7 meters. The full‑scale measurement‑range is 0‑0.125 mm peak‑to‑peak shaft radial‑vibration. It converts eddy‑current‑sensor shaft‑vibration signal into industry‑standard 4‑20 mA two‑wire loop‑signal output, directly feeds measurement‑value to DCS, PLC or SCADA control‑systems. It eliminates requirement for separate rack‑mount proximitor hardware, widely used for rotating‑machinery vibration‑monitoring without full‑3500‑rack TSI protection‑system.

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Description

Bently 990‑05‑70‑02‑00

Technical Specifications:

  • Compatible Transducer‑System: 3300 NSv probe plus extension‑cable, total electrical‑length 7 meters
  • Measured Parameter: Shaft radial vibration, peak‑to‑peak amplitude
  • Full‑Scale Measurement‑Range: 0‑0.125 mm peak‑to‑peak
  • 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
  • Frequency‑Response: 5 Hz ~ 6000 Hz (-3 dB)
  • Diagnostic Terminal: Prox‑Out gap‑voltage output terminal available
  • Maximum Allowable Loop‑Resistance: 1000 Ω @35 VDC
  • Mounting Method: 35 mm standard DIN‑rail clip mounting or panel screw‑mounting
  • Operating Temperature: ‑40 °C ~ +85 °C
  • Relative Humidity: 0‑95% RH non‑condensing
  • Startup‑Inhibition Function: Output holds below fault‑level current within 2‑3 seconds after power‑on Functional Features:
  1. Fully integrated proximitor circuit; NSv proximity‑probe system connects directly into transmitter without external separate proximitor unit.
  2. Two‑wire loop‑power architecture, same pair of signal‑cables deliver power‑supply and transmit 4‑20 mA measurement‑signal, reduces field‑wiring quantity.
  3. On‑board zero‑point and span adjustable potentiometers support on‑site calibration adjustment.
  4. Dedicated test‑input terminal allows loop‑function verification without real NSv sensor‑connection.
  5. Built‑in sensor‑loop fault‑detection circuit; upon probe open‑circuit, short‑circuit or cable‑fault condition, output locks to defined NOT‑OK fault‑current level to prevent control‑system false‑vibration‑alarm.
  6. Prox‑Out diagnostic‑terminal outputs raw DC gap‑voltage value, supports field‑troubleshooting for probe, connector and extension‑cable faults.
  7. Fully potted sealed internal‑construction, adapts high‑humidity industrial‑instrument‑cabinet operating‑environment. Application Scenarios: Radial‑shaft‑vibration online‑monitoring for compressors, fans and centrifugal‑pump‑units; machinery‑retrofit‑projects without 3500‑series TSI rack‑hardware; OEM original‑equipment‑manufacturer machine‑matching; hazardous‑area field‑signal‑conversion feeding DCS‑PLC control‑system. Performance Parameters: Amplitude linear‑error ≤±1.5% full‑scale; fault‑response‑time less than 200 ms; strong immunity against industrial‑field electromagnetic‑noise; low temperature‑drift across full operating‑temperature‑range. Material Composition: Flame‑retardant potting compound; multi‑layer analog‑digital mixed‑signal printed‑circuit‑board; high‑precision signal‑conditioning integrated‑chips; gold‑plated signal‑input‑output 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 accessible wiring‑terminal‑block; sealed calibration‑potentiometer access window; rear spring‑loaded DIN‑rail locking clip; housing surface printed with model‑number, full‑scale‑range value and unique unit serial‑number. Working Principle: Internal high‑frequency‑excitation circuit generates high‑frequency AC excitation signal and sends to connected NSv proximity‑probe coil. Shaft radial‑vibration changes physical gap‑distance between probe tip and rotating metal‑shaft‑target. Gap‑variation induces eddy‑current‑magnitude‑change on shaft‑surface, further generates probe‑coil‑impedance‑variation. Transmitter internal circuit samples impedance‑variation signal, calculates real‑time peak‑to‑peak vibration‑amplitude value, converts measured‑value into 4‑20 mA loop‑current signal. Fault‑diagnosis circuit continuously monitors sensor‑loop health‑status. Prox‑Out terminal outputs raw gap‑voltage value for maintenance‑inspection purpose. Installation Requirements:
  8. Securely clip transmitter onto standard 35 mm DIN‑rail inside instrument‑cabinet, confirm rear spring‑locking clip fully engaged.
  9. Strictly respect two‑wire loop‑signal polarity; never connect AC‑voltage onto loop‑power terminals.
  10. Total electrical‑length of NSv probe plus matched extension‑cable must maintain exact 7‑meter value matching transmitter factory‑calibration setting.
  11. Separate NSv sensor‑cable and 4‑20 mA output‑cable routing‑path away from high‑power motor and inverter power‑cables.
  12. Complete zero‑point and span calibration operation via test‑input terminal after installation and wiring completion. Usage Notes:
  13. Forbid cutting, splicing or re‑solder modification to NSv probe and matched extension‑cable assembly. Modified electrical‑length will invalidate measurement‑accuracy and factory‑calibration.
  14. Mark potentiometer position after finishing calibration; prohibit random adjustment during normal‑equipment‑running status.
  15. Do not exceed maximum allowable loop‑resistance value; excessive loop‑resistance causes 4‑20 mA output‑signal distortion.
  16. Periodically measure Prox‑Out gap‑voltage value during routine‑inspection work to detect connector‑loosening and cable‑aging risk ahead of actual equipment‑fault occurrence.

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