330878-91-00 Proximitor 50mm Bently Nevada No Approvals

Product Overview

The Bently Nevada 330878-91-00 is a 3300 XL 50 mm Proximitor Sensor with DIN-rail mounting and no agency approvals. It provides the same extended-range noncontact measurement capability as the 3300 XL 50 mm proximity transducer system for large displacement applications on rotating machinery. The unit is housed in A380 aluminum alloy and is factory-calibrated for reliable shaft vibration and position monitoring.

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: None
• 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 supports large displacement and differential expansion measurement
• DIN-rail mounting enables quick installation in control panels and junction boxes
• No agency approval option reduces cost for non-hazardous general industrial applications
• Identical electrical performance to approved variants, ensuring measurement consistency
• SpringLoc terminals simplify field wiring and reduce installation time
• Compact slim-profile housing fits high-density panel layouts

Applications

• General industrial machinery position monitoring without hazardous area requirements
• Large steam turbine differential expansion measurement in standard environments
• Hydro turbine and large pump axial displacement tracking
• Test stand and laboratory rotating equipment monitoring
• OEM machinery builds where agency certification is not mandated

FAQ

Q: How do I read the Bently Nevada 3300 XL 50 mm Proximitor ordering suffix?
A: The suffix uses three digits: first digit = length (5 = 5.0 m, 9 = 9.0 m); second digit = mount (0 = panel, 1 = DIN-rail); third digit = approvals (0 = none, 5 = multiple). For 330878-91-00, this decodes to 9.0 m system length, DIN-rail mount, no agency approvals.

Q: What is the difference between 330878-91-00 and 330878-91-05?
A> 330878-91-00 has no agency approvals; 330878-91-05 carries multiple approvals including CSA, ATEX, and IECEx. Electrical and physical specifications are identical.

Q: Can I upgrade from -00 to -05 later?
A: The sensors are physically interchangeable. If hazardous area certification becomes required, replace the -00 unit with a -05 approved unit.

Q: What probe and cable do I need?
A: Order one 3300 XL 50 mm proximity probe and one matching 3300 XL 50 mm extension cable for a complete system.

Q: Is DIN-rail mounting secure in high-vibration environments?
A: Yes. The DIN-rail clip design provides robust retention, and the A380 aluminum housing withstands industrial vibration levels.

Installation Guide

1. Power down the monitoring system before installation
2. Mount the sensor on a 35 mm symmetrical DIN rail inside the control enclosure
3. Connect the 3300 XL 50 mm probe and extension cable to the sensor input terminals
4. Apply -17.5 to -26 Vdc power to the SpringLoc terminals with correct polarity
5. Route the output signal cable to the monitor input channel
6. Adjust probe gap to the center of the linear range for maximum measurement symmetry
7. Energize the system and verify stable DC output voltage at the monitor

Selection Tips

• Select 330878-91-00 for cost-sensitive DIN-rail 9.0 meter 50 mm applications without agency approval requirements
• For panel mounting without approvals, choose 330878-90-00
• For multiple agency approvals, select 330878-91-05 (DIN) or 330878-90-05 (panel)
• For 5.0 meter system length, use 330878-51-00 (DIN) or 330878-50-00 (panel)
• Verify that the application does not require hazardous area certification before ordering the -00 variant
• Ensure monitor compatibility with 50 mm proximity probe 0.394 V/mm scale factor