Bently Nevada 3300 XL 25mm 330850-90-05 Proximitor

Product Overview

The Bently Nevada 330850-90-05 is a 3300 XL 25 mm Proximitor Sensor designed for precise vibration and position monitoring on rotating machinery. It forms the signal conditioning core of the 3300 XL 25 mm proximity transducer system, delivering a linear output of 0.787 V/mm (20 mV/mil) across a 12.7 mm (500 mils) measurement range. The unit is factory-calibrated to AISI 4140 steel and is ideal for differential expansion monitoring on mid-size to large steam turbine generators.

Key Specifications

• Product Family: 3300 XL 25 mm Proximity Transducer System
• System Length: 9.0 meters (29.5 feet)
• Mounting: Panel 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

• Enhanced RFI/EMI immunity ensures stable readings in high-frequency electrical environments
• SpringLoc terminal strips enable fast, tool-free field wiring connections
• Backward compatible with legacy 7200 series and 25 mm DE integral transducer systems
• Compact housing fits high-density DIN-rail or traditional panel-mount arrangements
• Dual seals and robust cable entry protect against moisture and contaminants
• Factory calibration to AISI 4140 steel target ensures out-of-box measurement accuracy

Applications

• Differential expansion measurement on steam turbine generators
• Radial vibration monitoring on large rotating machinery
• Axial position and thrust monitoring in turbomachinery
• Condition monitoring systems in power generation plants
• Petrochemical and oil & gas machinery protection systems

FAQ

Q: How do I decode the Bently Nevada 3300 XL Proximitor ordering suffix?
A: The suffix uses a three-digit code. The first digit indicates system length: 5 = 5.0 meters, 9 = 9.0 meters. The second digit indicates mounting: 0 = panel mount, 1 = DIN-rail mount. The third digit indicates agency approvals: 0 = none, 5 = multiple (CSA, ATEX, IECEx). Therefore, 330850-90-05 decodes as 9.0 m, panel mount, with multiple approvals.

Q: What probe and extension cable does the 330850-90-05 require?
A: It accepts one noncontacting 3300 XL 25 mm proximity probe and a matching 3300 XL 25 mm extension cable. Both are ordered separately.

Q: What is the difference between 330850-90-05 and 330850-91-05?
A: 330850-90-05 is panel mount; 330850-91-05 is DIN-rail mount. Both share the same 9.0 meter system length and multiple agency approvals.

Q: Can I use this sensor with a 7200 series monitor?
A: Yes. The 3300 XL 25 mm Proximitor Sensor output is identical to 7200 and 25 mm DE integral systems, enabling direct upgrades without monitor reconfiguration.

Q: What happens if the supply voltage is more positive than -23.5 Vdc?
A: Operation at a voltage more positive than -23.5 Vdc can result in reduced linear range. Maintain -17.5 to -26 Vdc without barriers, or -23 to -26 Vdc with barriers.

Installation Guide

1. Verify all power to the monitoring system is de-energized before installation
2. Mount the Proximitor Sensor in a panel using the supplied hardware for the 90 (panel mount) option
3. Connect the 3300 XL 25 mm proximity probe to the sensor input via the extension cable
4. Wire the power supply to the SpringLoc terminals: -17.5 to -26 Vdc, observing polarity
5. Connect the output signal to the monitor input channel
6. Gap the probe to 7.0 mm (275 mils) using an AISI 4140 steel target for calibration verification
7. Energize the system and verify output voltage matches the expected scale factor

Selection Tips

• Select 330850-90-05 for panel-mounted 9.0 meter 25 mm systems requiring multiple agency approvals
• For DIN-rail mounting, choose 330850-91-05 instead
• For 5.0 meter system length, select 330850-50-05 (panel) or 330850-51-05 (DIN)
• Without agency approvals, 330850-90-00 (panel) or 330850-91-00 (DIN) are available
• Always order the matching 3300 XL 25 mm probe and extension cable for complete system assembly
• Verify your monitor accepts 25 mm proximity probe input characteristics before ordering