330850-91-05 | Bently Nevada 25mm DIN Proximitor

Product Overview

The Bently Nevada 330850-91-05 is a 3300 XL 25 mm Proximitor Sensor with DIN-rail mounting designed for precise vibration and position monitoring on rotating machinery. It delivers a linear output of 0.787 V/mm (20 mV/mil) across a 12.7 mm (500 mils) range, making it ideal for differential expansion applications on steam turbine generators. The unit features multiple agency approvals and is factory-calibrated to AISI 4140 steel.

Key Specifications

• Product Family: 3300 XL 25 mm Proximity Transducer System
• System Length: 9.0 meters (29.5 feet)
• Mounting: DIN-rail mount
• Agency Approvals: Multiple (CSA, ATEX, IECEx)
• Linear Range: 12.7 mm (500 mils)
• Scale Factor: 0.787 V/mm (20 mV/mil)
• Power Supply: -17.5 Vdc to -26 Vdc, 12 mA maximum
• Output Resistance: 50 Ω
• Supply Sensitivity: Less than 2 mV change per volt change in input
• Material: A380 aluminum alloy housing
• Weight: 255 g (9 oz)
• Operating Temperature: -51°C to +100°C (-60°F to +212°F)
• Storage Temperature: -51°C to +105°C (-60°F to +221°F)

Features and Benefits

• DIN-rail mounting enables rapid installation in standard industrial control enclosures
• Enhanced RFI/EMI immunity maintains signal integrity near high-frequency equipment
• SpringLoc terminal strips provide secure, tool-free wiring connections
• Backward compatible with legacy 7200 series and 25 mm DE integral systems
• Compact slim-profile housing maximizes panel space utilization
• Multiple agency approvals support global deployment in hazardous areas

Applications

• Differential expansion monitoring on steam turbine generators
• Radial vibration and axial position measurement in turbomachinery
• Machinery protection systems in power generation facilities
• Condition monitoring in petrochemical and oil & gas plants
• High-density control panel installations requiring DIN-rail mounting

FAQ

Q: How do I read the Bently Nevada 3300 XL Proximitor suffix code?
A: The three-digit suffix follows this structure: first digit = system length (5 = 5.0 m, 9 = 9.0 m); second digit = mounting style (0 = panel, 1 = DIN-rail); third digit = approvals (0 = none, 5 = multiple). For 330850-91-05, this translates to 9.0 m system length, DIN-rail mount, with multiple agency approvals.

Q: What is the mounting difference between 330850-91-05 and 330850-90-05?
A: 330850-91-05 features DIN-rail mounting clips for 35 mm symmetrical rail installation, while 330850-90-05 is designed for panel mount.

Q: Does the DIN-rail version have the same electrical specifications?
A: Yes. Both 90 and 91 variants share identical electrical performance, linear range, and output characteristics.

Q: What cables and probes are required?
A: The sensor requires one 3300 XL 25 mm proximity probe and one 3300 XL 25 mm extension cable, ordered separately.

Q: Can I replace a 7200 series sensor with this unit?
A: Yes. The output is electrically identical to 7200 and 25 mm DE integral systems, allowing direct replacement without monitor changes.

Installation Guide

1. De-energize the monitoring system before handling the sensor
2. Clip the Proximitor Sensor onto a 35 mm symmetrical DIN rail inside the control enclosure
3. Connect the 3300 XL 25 mm 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 input channel
6. Set the probe gap to 7.0 mm (275 mils) against an AISI 4140 target
7. Power on and verify the output voltage corresponds to the 0.787 V/mm scale factor

Selection Tips

• Choose 330850-91-05 for DIN-rail mounted 9.0 meter 25 mm systems with multiple approvals
• For panel mounting, select 330850-90-05
• For 5.0 meter system length, use 330850-51-05 (DIN) or 330850-50-05 (panel)
• Without agency approvals, 330850-91-00 (DIN) or 330850-90-00 (panel) are available
• Ensure the control panel has adequate 35 mm DIN rail space before ordering
• Order matching 3300 XL 25 mm probe and extension cable as separate line items