330171-10-24-05-02-00 Bently Nevada 5mm Probe 1/4-28

Product Overview

In the 1980s, machinery protection relied on contact sensors that wore out. Then Bently Nevada introduced the 3300 series, a non-contact eddy current system that changed industrial vibration monitoring. The 330171-10-24-05-02-00 is a 5mm probe from that lineage, engineered for precise displacement measurement in harsh environments.

This probe features a 1/4-28 UNF thread, a 0.5-meter total length, and a miniature coaxial ClickLoc connector. Its polyphenylene sulfide (PPS) tip and AISI 304 stainless steel case provide durability. The probe operates with a -17.5 Vdc to -26 Vdc power supply at 12 mA maximum, delivering engineering-grade precision for turbine and compressor monitoring.

Key Features & Technical Specifications

• Input Voltage: Requires -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
• Output Resistance: 50 Ω for stable signal transmission.
• Isolation: Probe DC resistance from center to outer conductor is 7.45 ± 0.50 Ω at 0.5 m.
• Probe Tip Material: Polyphenylene sulfide (PPS) for chemical resistance.
• Probe Case Material: AISI 304 stainless steel (SST) for corrosion resistance.
• Connector: Miniature coaxial ClickLoc connector, standard cable.
• Temperature Range: -35°C to +177°C (-31°F to +351°F).
• Weight: 0.323 kg.

Its 5mm tip diameter enables precise gap measurement, while the 1/4-28 thread ensures secure mounting. The ClickLoc connector simplifies installation and maintenance.

Applications and Use Cases

This probe excels in rotating machinery monitoring. For instance, in a power plant, it measures radial vibration on steam turbines, preventing catastrophic failures. In oil refineries, it monitors compressor shaft displacement. Additionally, its wide temperature range suits gas turbine exhaust sections. The 0.5-meter cable length fits tight installations, and the unarmored design reduces weight.

Installation and Setup

Mount the probe using a 1/4-28 tapped hole. A #3 or larger tap drill is recommended. Maximum thread engagement is 0.375 in. Apply 5.1 N·m (45 in·lb) torque, not exceeding 7.3 N·m (65 in·lb). Ensure cable bend radius remains above 25.4 mm (1.0 in). Connect the ClickLoc connector to the extension cable, then to the proximitor. Verify -24 Vdc supply and 10 kΩ load for calibration.

Maintenance and Reliability

Inspect periodically for cable wear and connector integrity. Avoid temperatures below -34°C (-30°F) to prevent pressure seal failure. The PPS tip and stainless steel case resist most industrial chemicals. For engineering-grade accuracy, recalibrate annually or per site procedures. Contact AutoDCSTech with your exact requirements for precise matching.