Description
Bently 991‑06‑05‑02‑00
Technical Specifications:
- Matching Sensor System: 3300 NSv probe plus extension cable, total electrical length 5 meters
- Full‑Scale Measuring Range: ‑0.6 mm ~ +0.6 mm axial displacement
- Power Supply: Two‑wire loop power supply +12 VDC ~ +35 VDC
- Output Signal: 4‑20 mADC two‑wire loop
- Loop Accuracy: ±1.5% full‑scale
- Sensitivity: 7.87 V/mm
- Frequency Response: 0‑10 kHz
- Prox‑Out Diagnostic Terminal: Gap‑voltage measurement available
- Maximum Loop Resistance: 1000 Ω @35 VDC
- Mounting: 35 mm DIN‑rail clip or panel screw installation
- Operating Temperature: ‑40 °C ~ +85 °C
- Humidity: 0‑95% RH non‑condensing
- Startup suppression: Output maintains NOT‑OK status within 2‑3 seconds after power‑on Functional Features:
- Built‑in proximitor function, NSv probe directly connects to transmitter, eliminates separate proximitor hardware.
- Two‑wire loop power and signal transmission, minimizes field wiring quantity.
- Zero and span adjustable potentiometer for on‑site calibration work.
- Test‑input pin supports quick loop verification without real sensor connection.
- Sensor fault detection function locks output upon probe open‑circuit or short‑circuit fault, prevents false thrust‑position reading.
- Prox‑Out terminal outputs gap‑voltage, convenient for field probe‑cable fault diagnosis.
- Potted sealed structure adapts to high‑humidity cabinet environment. Application Scenarios: Axial thrust‑displacement monitoring of compressors, fans and pump units; machinery renovation projects without TSI rack; OEM equipment supporting; hazardous‑area on‑site thrust‑position signal transmission for control‑system input. Performance Parameters: Linear error ≤ ±1.5% FS; fault response time <200 ms; anti‑interference for industrial electromagnetic environment; low temperature drift. Material Composition: Flame‑retardant potting compound; multi‑layer PCB board; high‑precision signal‑processing chip; gold‑plated terminals; flame‑retardant plastic housing; metal DIN‑rail clip; silicone sealing gaskets. Structural Characteristics: Standard DIN‑rail rectangular housing; front‑side wiring terminal block; calibration potentiometer access window; rear DIN‑rail spring locking clip; housing printed with model, measuring range and serial identification. Working Principle: Internal high‑frequency excitation circuit delivers high‑frequency AC signal to NSv probe coil. When shaft moves axially, gap between probe and shaft target changes, eddy‑current intensity and coil impedance change accordingly. Internal circuit calculates actual axial displacement value from impedance variation and converts value into 4‑20 mA loop‑current output. Fault‑diagnosis circuit monitors sensor loop continuously. Prox‑Out terminal outputs DC gap‑voltage for maintenance inspection. Installation Requirements:
- Secure transmitter onto standard 35 mm DIN‑rail, confirm rear clip fully locked.
- Strictly observe two‑wire loop polarity, AC voltage must not access loop terminals.
- Total electrical length of NSv probe plus extension cable must strictly keep 5 meters matching factory calibration.
- Separate sensor signal wiring and 4‑20 mA output wiring away from high‑power drive cables.
- Perform zero‑span calibration via test‑input terminal after installation completion. Usage Notes:
- Prohibit cutting or splicing NSv probe and extension cable. Modified electrical length will invalidate measurement accuracy.
- Mark potentiometer position after calibration, avoid random adjustment during normal equipment operation.
- Loop resistance must not exceed maximum allowable value, otherwise output signal will distort.
- Regularly check gap‑voltage reading to detect connector loose and cable aging risk.
