330172-12-23-10-01-05 Bently Nevada 5mm Probe 1/4-28

Product Overview: 330172-12-23-10-01-05

The Bently Nevada 330172-12-23-10-01-05 is a 3300 series 5mm proximity probe engineered for exact displacement and vibration measurement in rotating machinery. Because it uses a 1/4-28 UNF thread and includes armor, this probe suits harsh industrial environments where mechanical protection is essential. Furthermore, its polyphenylene sulfide (PPS) tip and AISI 304 stainless steel case provide durable, stable performance.

Key Specifications of the 330172-12-23-10-01-05

• Input Voltage: -17.5 Vdc to -26 Vdc at 12 mA maximum.
• Output Resistance: 50 Ω.
• Isolation: Probe DC resistance 7.59 Ω ± 0.50 from center to outer conductor.
• Probe Tip Material: Polyphenylene sulfide (PPS).
• Case Material: AISI 304 stainless steel.
• Thread: 1/4-28 UNF, maximum engagement 0.375 in.
• Total Length: 1.0 metre (3.3 feet).
• Weight: 0.323 kg.

Notably, the 330172-12-23-10-01-05 requires a negative supply voltage; operation above -23.5 Vdc reduces linear range. Additionally, sensitivity is less than 2 mV change per volt of input variation, ensuring engineering-grade precision.

Installation and Setup

When mounting the 330172-12-23-10-01-05, drill and tap a 1/4-28 hole using a #3 or larger tap drill. Then, apply a recommended torque of 5.1 N·m (45 in·lb) to the probe case, never exceeding 7.3 N·m (65 in·lb). Also, maintain a minimum cable bend radius of 25.4 mm (1.0 in). Because the probe includes a miniature coaxial ClickLoc connector with protector, connect it carefully to avoid damage. Finally, verify that the target is AISI 4140 steel and set the gap to 1.27 mm (50 mils) for standard calibration.

Applications and Use Cases

The 330172-12-23-10-01-05 excels in condition monitoring of steam turbines, compressors, and pumps. For instance, its armored construction protects the cable in high-vibration areas. Moreover, the wide temperature range of -35°C to +177°C allows use in extreme environments. Consequently, this probe helps predict bearing wear and imbalance before failure occurs.

Maintenance and Reliability

Inspect the 330172-12-23-10-01-05 periodically for physical damage or loose connections. Because the probe tip is PPS, avoid exposure to temperatures below -34°C, which may cause premature seal failure. Additionally, check cable integrity and connector torque. Regular inspection ensures reliable operation and extends service life, reducing unplanned downtime.