Description
Bently Nevada 330980-50-00
Technical Specifications:
- Input: Receives signal from 3300 XL NSv proximity probes and matched extension cables
- Power Supply: -17.5 Vdc to -26 Vdc (without safety barrier); -23 Vdc to -26 Vdc (with safety barrier)
- Current Consumption: 12 mA typical
- Output Signal: 0 to -17 Vdc proportional to gap
- System Sensitivity: 7.87 mV/μm (200 mV/mil) ± 6.5%
- Linear Range: 0.5 to 1.75 mm (20 to 55 mil)
- Frequency Response: 0 to 10 kHz
- Operating Temperature: -51°C to +177°C (-60°F to +351°F)
- Mounting: Panel mount (4-hole pattern)
Functional Features:
- Processes eddy current signals from NSv proximity probes into proportional voltage output
- High immunity to radio frequency interference (RFI), allowing installation in fiberglass enclosures without adverse effects from nearby RF signals
- Supports panel-mount installation with standard 4-hole mounting footprint shared with older Proximitor designs
- Mounting base provides electrical isolation without requiring a separate isolation plate
- Compatible with 3300 XL NSv proximity probes and extension cables for system interchangeability
Application Scenarios:
- Centrifugal air compressors with tight clearance requirements
- Refrigeration compressors and process gas compressors
- Industrial fans, blowers, and pumps
- OEM machinery monitoring packages
- Applications connected to 990 vibration transmitters and 991 displacement transmitters
Performance Parameters:
- System sensitivity: 7.87 mV/μm (200 mV/mil) ± 6.5%
- Linear range: 0.5 to 1.75 mm (20 to 55 mil)
- Frequency response: 0 to 10 kHz
- Supply voltage sensitivity: less than 2 mV output change per 1 Vdc input variation
- Signal-to-noise ratio: 80 dB typical
Material Composition:
- Cast aluminum housing with anodized finish
- Internal PCB with tri-proof conformal coating
- ClickLoc镀金铜接头 (gold-plated copper ClickLoc connectors)
Structural Features:
- Compact panel-mount form factor
- 4-hole mounting pattern compatible with legacy Proximitor installations
- Electrical isolation integrated into the mounting base
- Factory-calibrated for system interchangeability
Working Principle:
The Proximitor contains a high-frequency oscillator circuit (1–2 MHz) that drives the probe coil to produce an alternating electromagnetic field. When the probe approaches a conductive target surface, eddy currents are induced on the target, and the reaction field changes the coil’s equivalent impedance. This impedance change is strictly proportional to the probe-to-target gap. The Proximitor uses phase-sensitive RF demodulation to separate the real part (corresponding to static gap) and the imaginary part (corresponding to dynamic vibration), then outputs a DC voltage proportional to the gap distance.
Installation Requirements:
- Mount in a panel using the standard 4-hole pattern
- Ensure adequate ventilation around the Proximitor housing
- Connect the extension cable from the NSv probe to the Proximitor input using ClickLoc connectors
- Verify that the total system electrical length (probe cable + extension cable) matches the Proximitor designation
- Ground the system according to Bently Nevada grounding practices to avoid ground loops
Usage Notes:
- The three components of the 3300 XL NSv system (probe, extension cable, Proximitor) must have consistent electrical lengths
- The Proximitor bias voltage and OK status must be verified after installation
- High RFI immunity allows installation in non-metallic enclosures, but proper grounding practices must still be followed
- Do not substitute with non-NSv Proximitor models without verifying system compatibility
