330850-90-00 | Bently Nevada 3300 XL 25 mm Proximitor Sensor (9.0 m)

Product Overview

The Bently Nevada 330850-90-00 is a 3300 XL 25 mm Proximitor Sensor configured for 9.0 meters (29.5 ft) system length with panel mounting and no agency approvals. The extended cable length enables installation in large machinery where the proximitor must be mounted remotely from the measurement point, such as large steam turbines, hydroelectric generators, and heavy-duty compressors with significant probe-to-cabinet distances.

Key Specifications

• Product Family: 3300 XL 25 mm Proximity Transducer System
• System Length: 9.0 meters (29.5 feet)
• Mounting Option: Panel mount
• Agency Approval: None (00 suffix)
• Probe Input: One noncontacting 3300 XL 25 mm proximity probe + extension cable
• Linear Range: 12.7 mm (500 mils)
• Average Scale Factor: 0.787 V/mm (20 mV/mil) ±5%
• Frequency Response: 0 Hz to 10 kHz (±1 dB)
• Power Supply: -17.5 Vdc to -26 Vdc (without barriers), max 12 mA; -23 Vdc to -26 Vdc (with barriers)
• Supply Sensitivity: < 2 mV output change per 1 V input change
• Output Resistance: 50 Ω
• Target Material: Factory calibrated for AISI 4140 steel
• Housing Material: A380 aluminum alloy
• Operating Temperature: -35°C to +85°C (-31°F to +185°F)
• Storage Temperature: -51°C to +100°C (-60°F to +212°F)
• Weight: Approx. 0.22 kg
• Dimensions: 8.0 × 6.2 × 6.5 cm

Compatibility & Applications

The 9.0 m system length is essential for large steam turbine differential expansion monitoring, hydroelectric generator air gap measurement, large centrifugal compressor bearing vibration tracking, heavy-duty pump motor shaft position monitoring, and gas turbine rotor dynamics assessment where the probe location is far from the instrument cabinet.

FAQ

• Q: What is the difference between 50-00 and 90-00? A> "50" = 5.0 m system length; "90" = 9.0 m system length. Both are panel mount with no approvals. Select based on the physical distance between the probe mounting location and the proximitor installation point.
• Q: Does the longer cable affect signal quality? A> The 9.0 m system is factory-matched and calibrated. Signal integrity is maintained within specification. Do not attempt to splice or extend cables beyond the factory length.
• Q: Can I use a 5.0 m probe with a 9.0 m proximitor? A> No. The probe, extension cable, and proximitor form a matched system. Mixing components from different system lengths will result in incorrect scale factor and degraded linearity.
• Q: What is the maximum cable run? A> The 9.0 m system length includes the probe, extension cable, and proximitor. The output signal from the proximitor can typically be run an additional 300 m to the monitor.

Installation Guide

1. Mount the proximitor on a grounded panel in the instrument cabinet or junction box.
2. Route the 9.0 m probe/extension cable assembly through conduit or cable tray to the measurement point.
3. Ensure cable bend radius meets manufacturer specifications (typically 25 mm minimum).
4. Connect the probe to the proximitor and verify continuity.
5. Apply power and verify gap voltage at the target center position.
6. Connect output to the monitoring system.

Selection Tips

• Select 330850-90-00 for 9.0 m system length, panel mount, non-hazardous applications.
• For 9.0 m with hazardous area approvals, use 330850-90-05 (panel) or 330850-91-05 (DIN).
• For 9.0 m with China approval, use 330850-90-CN.
• Measure the actual distance from probe to cabinet before ordering; excessive cable slack can introduce noise pickup.