3300 XL 50mm 330878-91-05 Bently Nevada Proximitor

Product Overview

The Bently Nevada 330878-91-05 is a 3300 XL 50 mm Proximitor Sensor with DIN-rail mounting designed for large displacement measurement applications on rotating machinery. It serves as the signal conditioning unit for the 3300 XL 50 mm proximity transducer system, providing extended-range noncontact measurement of shaft displacement, vibration, and position. The unit carries multiple agency approvals and is housed in durable A380 aluminum alloy.

Key Specifications

• Product Family: 3300 XL 50 mm Proximity Transducer System
• System Length: 9.0 meters (29.5 feet)
• Mounting: DIN-rail mount
• Agency Approvals: Multiple (CSA, ATEX, IECEx)
• Linear Range: 27.9 mm (1100 mils) maximum
• Scale Factor: 0.394 V/mm (10 mV/mil)
• Probe Type: 50 mm proximity probe (ordered separately)
• Material: A380 aluminum alloy housing
• Operating Temperature: -51°C to +100°C (-60°F to +212°F)
• Storage Temperature: -51°C to +105°C (-60°F to +221°F)
• Weight: 255 g (9 oz) typical
• Power Supply: -17.5 Vdc to -26 Vdc
• Output Resistance: 50 Ω

Features and Benefits

• 50 mm probe range enables measurement of large axial displacements and differential expansion
• DIN-rail mounting simplifies installation in standard industrial control enclosures
• Extended linear range of 27.9 mm is the longest in the Bently Nevada eddy current transducer line
• Multiple agency approvals facilitate deployment in hazardous area classifications worldwide
• Robust A380 aluminum housing withstands extreme industrial temperatures and vibration
• SpringLoc terminal strips provide secure, reliable field wiring without specialized tools

Applications

• Large steam turbine differential expansion monitoring
• Hydro turbine wicket gate position measurement
• Large compressor axial displacement tracking
• Generator end-play and thrust position monitoring
• Heavy rotating machinery with significant thermal growth

FAQ

Q: How do I decode the Bently Nevada 3300 XL 50 mm Proximitor suffix?
A: The three-digit suffix follows this pattern: first digit = system length (5 = 5.0 m, 9 = 9.0 m); second digit = mounting (0 = panel, 1 = DIN-rail); third digit = approvals (0 = none, 5 = multiple). For 330878-91-05, this means 9.0 m system length, DIN-rail mount, with multiple agency approvals.

Q: Which modules require the 3300 XL 50 mm transducer system?
A: Large steam turbine generators requiring differential expansion or rotor expansion measurement where the expected axial movement exceeds the range of 25 mm or 8 mm systems.

Q: What wire gauge range is supported?
A: The terminal block supports field wiring from 0.2 to 1.5 mm² (16 to 24 AWG) using three-conductor shielded triad cable.

Q: Is there a spring clamp version available?
A> The 3300 XL 50 mm Proximitor uses SpringLoc terminal strips for robust field wiring. Mounting options are panel or DIN-rail only.

Q: What is the output scale factor of the 50 mm system?
A: The 3300 XL 50 mm Proximitor outputs 0.394 V/mm (10 mV/mil), identical to legacy 7200 50 mm and 50 mm DE integral systems.

Installation Guide

1. De-energize the machinery protection system before installation
2. Clip the Proximitor Sensor onto a 35 mm symmetrical DIN rail
3. Connect the 3300 XL 50 mm proximity probe and extension cable to the sensor input
4. Wire -17.5 to -26 Vdc power to the SpringLoc terminals with correct polarity
5. Route the output signal to the monitor or data acquisition system
6. Adjust probe gap to the center of the linear range for maximum measurement symmetry
7. Power on and verify stable DC output voltage at the monitor

Selection Tips

• Choose 330878-91-05 for DIN-rail 9.0 meter 50 mm systems with multiple agency approvals
• For panel mounting, select 330878-90-05
• For 5.0 meter system length, use 330878-51-05 (DIN) or 330878-50-05 (panel)
• Without agency approvals, 330878-91-00 (DIN) or 330878-90-00 (panel) are available
• Verify the monitor supports 50 mm proximity probe input characteristics
• Consider complementary transducer arrangements when total DE range exceeds 27.9 mm