330173-00-08-05-02-05 Bently Nevada 3300 5mm Probe M8x1

What Causes Proximity Probe Signal Drift in Turbomachinery?

Signal drift and false trips often trace back to the wrong probe for the application. The Bently Nevada 330173-00-08-05-02-05 solves this with engineering-grade precision. It is a 3300 5mm probe with an M8 x 1 thread and no armor. The probe uses a polyphenylene sulfide (PPS) tip and an AISI 304 stainless steel (SST) case.

330173-00-08-05-02-05 Key Specifications

• Power requirement: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
• Supply sensitivity: Less than 2 mV output change per volt input change.
• Output resistance: 50 Ω.
• Probe DC resistance: 7.45 ± 0.50 Ω at 0.5 m length.
• Probe cable: 75 Ω triaxial, FEP insulated.
• Tensile strength: 222 N (50 lbf) case to lead and lead to extension connectors.
• Probe case torque: 5.1 N·m (45 in·lb) recommended; 7.3 N·m (65 in·lb) maximum.
• Minimum cable bend radius: 25.4 mm (1.0 in).
• Probe temperature range: -35°C to +177°C (-31°F to +351°F).
• Weight: 0.323 kg.

Note: Operation at a more positive voltage than -23.5 Vdc can result in reduced linear range. Exposing the probe below -34°C (-30°F) may cause premature pressure seal failure.

Installation and Thread Engagement

The M8 x 1 thread allows a maximum thread engagement of 12 mm. The unthreaded length is 0 mm, and the overall case length is 80 mm. The total length is 0.5 meter (1.6 feet). A miniature coaxial ClickLoc connector with standard cable is fitted. This probe carries multiple agency approvals. For exact torque values, follow the recommended 5.1 N·m (45 in·lb) and never exceed 7.3 N·m (65 in·lb).

Reliability and Environmental Performance

Magnetic field effects are documented for a 5-meter system. At a 50 mil gap, the probe output is 0.0014 mil pp/gauss, and the XL extension cable is 0.0014 mil pp/gauss. The XL Proximitor Sensor contributes 0.0131 mil pp/gauss. These verified values help predict performance in high-field environments. The probe temperature range of -35°C to +177°C supports many industrial conditions. However, avoid temperatures below -34°C (-30°F) to protect the pressure seal.