330191-00-33-15-00 | Bently Nevada 8 mm ETR Proximity Probe

Bently Nevada 330191-00-33-15-00: 3300 XL 8 mm ETR Proximity Probe

The Bently Nevada 330191-00-33-15-00 is an 8 mm eddy current proximity probe from the 3300 XL series. It provides precise, non-contact measurement of shaft vibration, axial position, and radial displacement in rotating machinery. This probe features a 3/8-24 UNF thread, a 3.3-inch overall case length, and a 1.5-metre total length. It is supplied without armor and without agency approval, making it ideal for standard industrial installations where intrinsic safety certification is not required.

Technical Specifications

• 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; refer to official datasheet.
• Probe DC Resistance: 7.73 Ω ± 0.50 Ω from center conductor to outer conductor.
• Output Resistance: 50 Ω.
• Supply Sensitivity: Less than 2 mV change in output voltage per volt change in input voltage.
• Probe Tip Material: Polyphenylene sulfide (PPS).
• Probe Case Material: AISI 303 or 304 stainless steel.
• Cable Type: 75 Ω triaxial, FEP insulated (standard) or PFA insulated (ETR).
• Connector Material: Gold-plated brass or gold-plated beryllium copper.
• Maximum Connector Torque: 0.565 N•m (5 in•lbf).
• Thread: 3/8-24 UNF, maximum thread engagement 0.563 in.
• Weight: 323 g/m (11.4 oz).
• Temperature Range (Probe Only): -55°C to +232°C (T1) for EPL Ga and Gc.

Key Features and Engineering Advantages

The 3300 XL 8 mm probe incorporates patented TipLoc and CableLoc designs. TipLoc molding provides a robust bond between the probe tip and body, while CableLoc ensures 330 N (75 lbf) pull strength. The 8 mm probe body offers thicker encapsulation of the probe coil in molded PPS plastic, resulting in a more rugged tip and a stronger case. This makes the 330191-00-33-15-00 highly resistant to physical abuse in demanding industrial environments.

Comparison with Other Proximity Probe Options

• 3300 XL 8 mm vs. 5 mm: The 8 mm probe provides a thicker PPS encapsulation and a larger diameter case, offering greater robustness against physical abuse. The 5 mm probe is smaller and suited for limited-space applications.
• ETR vs. Standard Cable: The ETR (Extended Temperature Range) cable uses PFA insulation, allowing operation up to +232°C. Standard FEP cable is limited to lower temperatures.
• Armored vs. Non-Armored: This model is without armor. Armored versions include a flexible stainless steel jacket for additional mechanical protection.
• Agency Approval: This unit has no agency approval (option 00). Approved versions are available for hazardous area installations.

Applications and Use Cases

The 330191-00-33-15-00 is suitable for continuous monitoring of critical turbomachinery, including steam turbines, gas turbines, compressors, and pumps. Its 1.5-metre total length and 3/8-24 UNF thread allow direct mounting in standard probe holders. The extended temperature range cable ensures reliable operation in high-temperature zones, such as near turbine exhausts. Additionally, the probe's rugged construction minimizes failure risk in high-vibration environments.

Installation and Maintenance

Install the probe using a 3/8-24 UNF threaded holder, ensuring maximum thread engagement of 0.563 in. Connect the probe to a Bently Nevada extension cable and proximitor for a complete measurement system. Verify that the input voltage is within -17.5 Vdc to -26 Vdc. For nonincendive installations, follow drawing 140979. Periodically inspect the probe tip and cable for mechanical damage or contamination. Clean the probe tip with a soft cloth and approved solvent, if necessary. Do not exceed the maximum connector torque of 0.565 N•m.

Frequently Asked Questions

Q: What is the input voltage requirement for the 330191-00-33-15-00?

A: The probe requires -17.5 Vdc to -26 Vdc when installed with a nonincendive circuit per installation drawing 140979. With barriers, use -23 Vdc to -26 Vdc.

Q: What is the maximum current consumption?

A: The maximum consumption is 12 mA.

Q: What is the probe DC resistance?

A: The nominal probe DC resistance is 7.73 Ω ± 0.50 Ω from center conductor to outer conductor.

Q: Is this probe agency approved?

A: No, this model has agency approval option 00, meaning approval is not required. For hazardous area installations, consult Bently Nevada for approved alternatives.

For precise matching and engineering-grade support, contact AutoDCSTech with your exact requirements.