Bently Nevada 330780-51-05 3300 XL 11mm Proximitor Sensor

Product Overview

The Bently Nevada 330780-51-05 is a 3300 XL 11 mm Proximitor Sensor with a 5.0 meter (16.4 feet) system length, DIN rail mount, and multiple agency approvals (CSA, ATEX, IECEx). The 11 mm probe diameter provides a longer linear range and improved measurement accuracy compared to the standard 8 mm system, making it the preferred choice for applications requiring extended measurement range or higher resolution. Its thin-profile design enables mounting in either high-density DIN-rail installations or traditional panel mount configurations.

Key Specifications

• Product Type: 3300 XL 11 mm Proximitor Sensor
• System Length: 5.0 meters (16.4 feet)
• Mounting Option: DIN rail mount (high-density or traditional panel)
• Linear Range: 4.0 mm (160 mils) — 60% greater than 8 mm system
• Average Scale Factor: 3.94 V/mm (100 mV/mil)
• Power Requirements: -17.5 Vdc to -26 Vdc (max 12 mA without barriers); -23 Vdc to -26 Vdc with barriers
• Supply Sensitivity: <2 mV per volt input change
• Output Resistance: 50 Ω
• Operating Temperature: -35°C to +85°C (-31°F to +185°F)
• Storage Temperature: -51°C to +100°C (-60°F to +212°F)
• Relative Humidity: 100% condensing (non-submersible with protected connectors)
• Material: A380 aluminum housing
• Weight: Approx. 0.255 kg
• Agency Approvals: 05 = Multiple (CSA, ATEX, IECEx)

Features & Benefits

• Extended 4.0 mm linear range — 60% greater than the 8 mm system, enabling measurement of larger axial displacements and vibration amplitudes without probe replacement
• DIN rail mounting — thin-profile design snaps onto standard 35 mm DIN rail, reducing cabinet footprint by 40% compared to traditional panel mount proximitors
• Multiple hazardous area approvals — CSA (North America), ATEX (Europe), and IECEx (international) certifications enable installation in Class I, Div 1 and Zone 0/1 environments without additional barriers
• Improved RFI/EMI immunity — achieves European CE mark approvals without special mounting considerations; prevents interference from nearby radio transmitters and VFDs
• SpringLoc terminal strips — tool-free wiring with robust spring-clamp connections, reducing installation time and improving vibration resistance
• Backwards compatible — replaces 7200-series 11 mm and 14 mm transducer systems while maintaining monitoring rack compatibility

Typical Applications

• Large steam turbine axial position and thrust bearing monitoring
• Gas turbine compressor end float measurement
• Hydroelectric generator air gap and magnetic center monitoring
• Large pump and compressor axial displacement protection
• Machine tool spindle position and vibration monitoring
• Hazardous area installations in refineries, chemical plants, and offshore platforms

Installation Guide

1. Verify hazardous area requirements — confirm your zone classification (Class I, Div 1 or ATEX Zone 1) and ensure the -05 approval suffix matches your safety documentation.
2. Mount on DIN rail — snap the proximitor onto a standard 35 mm DIN rail in a vibration-free, environmentally controlled cabinet. Ensure 25 mm clearance on all sides for ventilation.
3. Connect probe and extension cable — join the 11 mm probe to the extension cable, then to the proximitor; verify connectors are fully seated.
4. Apply power — supply -17.5 to -26 Vdc (or -23 to -26 Vdc with barriers). Verify output bias voltage of approximately -8.5 Vdc.
5. Gap probe to target — set the probe gap to the midpoint of the 4.0 mm linear range (approximately 2.0 mm from target) for optimal linearity.
6. Verify scale factor — confirm 3.94 V/mm (100 mV/mil) output using a calibration fixture or known displacement.
7. Document barrier installation — if using intrinsic safety barriers, record barrier part numbers and loop resistance in your commissioning documentation.

FAQ

Q: What is the difference between 330780-51-05 and 330780-50-00?
A: The 330780-51-05 has DIN rail mounting and multiple agency approvals (CSA, ATEX, IECEx). The 330780-50-00 has panel mounting and no approvals. Both have 5.0 meter system lengths. Choose 51-05 for hazardous area DIN rail installations; choose 50-00 for general-purpose panel mount applications.

Q: What is the advantage of 11 mm over 8 mm probes?
A: The 11 mm system provides a 4.0 mm linear range versus 2.0 mm for the 8 mm system — a 60% increase. This enables measurement of larger axial displacements and higher vibration amplitudes without changing probes. It also offers improved signal-to-noise ratio on large targets.

Q: Is this proximitor compatible with 3300 XL 8 mm probes?
A: No. The 330780 is an 11 mm proximitor with unique coil geometry and calibration. It must be used with 11 mm probes and extension cables only.

Q: What does the -05 approval suffix cover?
A: The -05 suffix indicates multiple hazardous area approvals including CSA (North America), ATEX (Europe), and IECEx (international). It is suitable for Class I, Div 1 Groups A-D and Zone 0/1 installations when wired per Bently Nevada drawing 167538.

Q: Can I mount this proximitor on a panel instead of DIN rail?
A: The -51 suffix is optimized for DIN rail mounting. While physical panel mounting is possible with adapter brackets, it is not recommended as it defeats the space-saving design intent and may affect thermal performance.

Selection Tips

• Choose 330780-51-05 for hazardous area applications requiring DIN rail mounting and international approvals (CSA/ATEX/IECEx).
• If you need panel mounting without hazardous area certification, the 330780-50-00 is the cost-optimized alternative.
• For 9.0 meter system length, select 330780-90-05 (panel mount) or 330780-91-05 (DIN mount).
• Verify your target size — 11 mm probes require larger minimum targets than 8 mm systems for factory-calibrated accuracy.
• Confirm your monitoring system supports the 11 mm scale factor (3.94 V/mm or 100 mV/mil) before ordering.
• Always check the barrier compatibility for your hazardous area loop — Bently Nevada recommends -23 to -26 Vdc when barriers are installed.