330173-00-04-20-02-05 Bently Nevada 5mm Probe M8 Thread

Product Overview

For engineers managing rotating machinery, unexpected downtime from undetected vibration can cost thousands per hour. The Bently Nevada 330173-00-04-20-02-05 is a 3300 series 5mm probe engineered for exact displacement and vibration measurement. This unarmored probe features an M8 x 1 thread and a 2.0-meter total length, delivering engineering-grade precision in a compact stainless steel case. Its polyphenylene sulfide (PPS) tip and AISI 304 stainless steel case ensure durability in harsh industrial environments. With a miniature coaxial ClickLoc connector, installation is streamlined, reducing commissioning time and associated labor costs.

Technical Specifications

• Input Voltage: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
• Output Resistance: 50 Ω.
• Probe DC Resistance: 7.88 ± 0.50 Ω from center conductor to outer conductor.
• Probe Tip Material: Polyphenylene sulfide (PPS).
• Probe Case Material: AISI 304 stainless steel (SST).
• Total Length: 2.0 metres (6.6 feet).
• Weight: 0.323 Kg.
• Connector: Miniature coaxial ClickLoc connector, standard cable.
• Agency Approval: Multiple Approvals.

Each specification directly impacts operational cost: the low 12 mA consumption reduces power supply load, while the 50 Ω output resistance ensures signal integrity over long cable runs, minimizing costly false alarms. The 2.0 m length provides installation flexibility, avoiding the need for extension cables in many setups.

Applications and Use Cases

This probe is ideal for continuous monitoring of steam turbines, compressors, and large motors. In power generation, it detects shaft vibration early, preventing catastrophic failures that lead to unplanned outages. For oil and gas, the M8 x 1 thread enables secure mounting on API-compliant machinery. Additionally, the -35°C to +177°C temperature range supports reliable operation in extreme climates, reducing the need for costly environmental controls. By providing precise displacement data, the probe helps maintenance teams schedule repairs during planned shutdowns, cutting overtime expenses.

Installation and Setup

Install the probe using the M8 x 1 thread, ensuring a maximum thread engagement of 12 mm. The recommended probe case torque is 5.1 N·m (45 in·lb), with a maximum of 7.3 N·m (65 in·lb). Maintain a minimum cable bend radius of 25.4 mm (1.0 in) to prevent damage. For connector-to-connector torque, refer to the official datasheet. Proper installation avoids signal degradation and extends probe life, directly reducing replacement costs.

Maintenance and Reliability

Periodically inspect the probe tip for wear or contamination. The PPS tip resists most industrial chemicals, but exposure to temperatures below -34°C (-30°F) may cause premature pressure seal failure. In high-magnetic-field environments, the probe's output remains stable, as indicated by its low sensitivity to 60 Hz fields. Regular checks ensure measurement accuracy, preventing false trips and unnecessary maintenance spending.