Description
Bently Nevada 3300 XL 8mm Proximitor® Sensor
Part Number: 330780-50-00
1. Product Introduction
The 330780-50-00 is a critical signal processing unit within the Bently Nevada 3300 XL 8mm Proximity Transducer System. It functions as the oscillator-demodulator and driver for the 8mm proximity probes. This Proximitor converts the raw radio frequency (RF) signal from the probe into a linear DC voltage proportional to the gap between the probe tip and the target shaft material. Designed with RFI/EMI protection and high-temperature tolerance, it is the industry standard for reliable signal conditioning in harsh industrial environments.
330780-50-00
2. Main Technical Specifications
- Part Number Breakdown:
- 330780: 3300 XL 8mm Proximitor Sensor.
- 50: System Length. This Proximitor is calibrated to support a Total System Length of 5.0 meters.
- 00: Standard options / approvals (Base model).
- Input Power:
- Voltage: -23.0 to -26.4 VDC (Unregulated supply from monitor rack).
- Current: Typical current draw is < 15 mA per channel.
- Output Signal:
- Linearity: ±1% of full scale (typically 80 mils / 2mm linear range).
- Sensitivity: 7.87 V/mm (200 mV/mil) across the linear range.
- Output Impedance: Low impedance (suitable for driving long cables to monitoring racks).
- Physical Specifications:
- Housing: Polycarbonate (or optional metal housing depending on revision).
- Dimensions: 3.50 inches x 2.00 inches x 1.00 inches (Standard DIN rail or panel mount).
- Environmental Specifications:
- Operating Temperature: -51°C to +100°C (-60°F to +212°F).
- Approvals: Standard versions usually meet CSA and CENELEC requirements (verify with specific datasheet for “00” suffix).
3. Typical Applications
The 330780-50-00 is utilized wherever continuous, high-precision shaft vibration or position measurement is required:
- Radial Vibration Monitoring: Primary signal conditioning for fluid film bearing machines (turbines, compressors).
- Axial Position (Thrust) Monitoring: Providing critical analog signals for thrust active protection systems.
- Speed/Keyphasor® Measurement: Processing timing signals from a dedicated proximity probe.
- Rack-Based Monitoring Systems: Direct interface to Bently Nevada 3500, 3300, and older 7200 monitoring racks.
4. Avoid Technical Pitfalls (Best Practices & Warnings)
- Critical: System Length Matching: The “50” in the part number indicates this unit is calibrated for a 5.0-meter system. You must pair this Proximitor with a Probe and Extension Cable that sum up to exactly 5.0 meters. Using a 5.0m Proximitor with a 3.0m or 8.0m cable set will result in incorrect scaling, leading to potentially catastrophic measurement errors.
- Probe Mismatch (11mm vs. 8mm): Do not use this 8mm Proximitor (330780) with 11mm Probes (3300 XL 11mm system). While the connectors may look similar, the linearization curves are different. The 11mm system requires part number 330180.
- Supply Voltage Polarity: Proximitors are sensitive to reverse polarity. Ensure the -24 VDC input is connected correctly (negative to common, positive to supply return) to avoid permanent damage to the internal electronics.
- Environmental Sealing: If mounted in a field junction box, ensure the enclosure has proper breathers/drain plugs. If the Proximitor is mounted vertically, do not mount it with the electrical connector pointing downwards, which can trap moisture and corrosion.
- Grounding: The terminal block grounding screw must be connected to the plant ground grid. Improper grounding causes noise (ground loops) that manifests as “ski slope” noise on the vibration waveform.
5. Related Product Recommendations
- Matching Probes: 330103 or 330130 Series 8mm Probes.
- Matching Extension Cables: 330730 or 330709 Series Cables.
- Housing/Enclosure: Bently Nevada 128775-01 or standard NEMA 4X junction boxes for field mounting.
- Monitor Racks: 3500/05 Rack with 3500/40M or 3500/42M Monitor Modules.
- Interface Cables: 3-pin or 4-pin shielded cables (e.g., Belden 8771 or equivalent) for connecting the Proximitor output to the rack.
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