330191-00-16-20-05 Bently Nevada 3300 XL 8 mm ETR Probe

Product Overview: What Is the 330191-00-16-20-05?

The 330191-00-16-20-05 is a Bently Nevada 3300 XL 8 mm ETR proximity probe engineered for precise, non-contact displacement and vibration measurement in rotating machinery. As part of the 3300 XL series, this probe delivers engineering-grade precision for critical turbomachinery applications. The model features a 3/8-24 UNF thread, a 1.6-inch overall case length, and a 2.0-meter total length. It is supplied without armor and carries CSA, ATEX, and IECEx approvals for use in hazardous areas.

Key Specifications of the 330191-00-16-20-05

• Input Voltage: Requires -17.5 Vdc to -26 Vdc when installed with a nonincendive circuit per installation drawing 140979.
• Output Current: 12 mA maximum consumption; -23 Vdc to -26 Vdc with barriers.
• Isolation: Not specified in available data; refer to official datasheet.
• Sensitivity: Less than 2 mV output voltage change per volt input voltage change.
• Output Resistance: 50 Ω.
• Nominal Probe DC Resistance: 7.88 ± 0.50 Ω at 2.0 m.
• Probe Tip Material: Polyphenylene sulfide (PPS).
• Probe Case Material: AISI 303 or 304 stainless steel.
• Cable: 75 Ω triaxial, FEP-insulated standard cable; PFA-insulated ETR cable.
• Tensile Strength: 330 N (75 lbf) probe case to probe lead; 270 N (60 lbf) at connectors.
• Connector Material: Gold-plated brass or beryllium copper.
• Maximum Connector Torque: 0.565 N·m (5 in·lbf).
• Thread Engagement: 3/8-24 UNF, maximum 0.563 in.
• Weight: 323 g/m (11.4 oz).
• Temperature Range: -55°C to +232°C (probe only, EPL Ga/Gc T1).

Notably, the patented TipLoc molding method creates a robust bond between probe tip and body, while the CableLoc design provides 330 N pull strength. These features ensure reliable performance in high-vibration environments.

Applications and Use Cases

The 330191-00-16-20-05 excels in condition monitoring of steam turbines, compressors, and pumps. Because it measures radial and axial displacement without contact, it is ideal for high-speed rotating equipment. Additionally, its hazardous area approvals make it suitable for oil and gas installations. For optimal robustness against physical abuse, Bently Nevada recommends using 8 mm probes whenever possible. This probe is also compatible with the FluidLoc option, which prevents oil leakage through the cable interior.

Installation and Setup

Install the probe using a 3/8-24 UNF threaded mounting. Ensure maximum thread engagement of 0.563 in for secure mounting. Connect the probe to a Bently Nevada extension cable and proximitor for proper operation. Note that one-meter systems do not use an extension cable. Verify that the supply voltage remains within -17.5 Vdc to -26 Vdc for nonincendive circuits, or -23 Vdc to -26 Vdc with barriers. Operation at a more positive voltage than -23.5 Vdc can reduce linear range. For precise matching, contact AutoDCSTech with your exact requirements.

Maintenance and Reliability

Periodically inspect the probe tip and cable for physical damage or wear. Since the probe seals differential pressure with a Viton O-ring, check for leaks in high-pressure applications. However, probes are not pressure tested prior to shipment. The stainless steel case and PPS tip resist corrosion and abrasion. In addition, the gold-plated connectors maintain signal integrity over time. For engineering-grade precision, adhere to the specified temperature schedule for your EPL classification.