Product Overview

The 330192-10-80-90-CN is an Extended Temperature Range (ETR) Proximity Probe belonging to the Bently Nevada 3300 XL 8 mm series. This transducer is engineered for vibration and position measurements in environments where standard probes exceed their thermal limits. The ETR version utilizes perfluoroalkoxy (PFA) insulated triaxial cabling to maintain signal integrity under high thermal stress. This specific configuration features a 1.0-inch unthreaded length, an 8.0-inch overall case length, and a 9.0-meter total cable length. It is primarily utilized within the 3500 and 3300 Machinery Protection Systems (TSI) for monitoring steam turbines, gas turbines, and large industrial compressors. The "CN" designation indicates compliance with country-specific agency approvals for hazardous area installations.

Technical Configuration

The 3300 XL ETR probe system provides a linear output voltage proportional to the gap between the probe tip and the target shaft.

• Thermal Resilience: Rated for extended temperatures beyond standard 3300 XL specifications.

• Probe Tip: Constructed from Polyphenylene sulfide (PPS) for high chemical and thermal stability.

• Cabling: 75 ohm triaxial PFA insulated cable designed to reduce parasitic capacitance and environmental interference.

• Mounting: 3/8-24 threaded body with a 1.0-inch unthreaded section for precise gap adjustment in deep-reach machine housings.

Technical Specifications

Ordering Information

Accurate identification of the dash options is critical for ensuring the probe reaches the target surface through the machine casing.

• Product Number: 330192

• Option 10: 1.0 in Unthreaded Length

• Option 80: 8.0 in Overall Case Length

• Option 90: 9.0 m Total Length

• Option CN: Country Specific Approvals

Engineering & Installation Guide

Precision installation is mandatory to ensure the E-E-A-T reliability of the Machinery Protection System.

• Gap Setting: Probes must be gapped using a digital voltmeter at the Proximitor output. The standard linear range typically centers at -10.0 Vdc for a 4140 steel target.

• Mechanical Clearances: Ensure the probe tip has a minimum side clearance of two probe tip diameters from any adjacent metal to avoid side-viewing interference.

• Temperature Gradient: While the ETR probe is rated for high temperatures, the connection between the probe lead and the extension cable should be located in a lower-temperature zone if possible, or protected with high-temperature connector protectors.

• Handling Precautions: PFA insulated cables are more susceptible to kinking than standard coaxial cables. Maintain a minimum bend radius of 25.4 mm (1.0 in) to prevent internal conductor damage.

• Signal Noise: Ensure the triaxial shield is properly grounded at the Proximitor Sensor end only. Avoid multiple ground points to prevent ground loops in the TSI rack.

FAQ

• Is this ETR probe compatible with standard 3300 XL extension cables?

  The ETR probe requires a specific 3300 XL ETR extension cable to ensure the system remains within its technical temperature and electrical specifications.

• What is the impact of using the "CN" approval option?

  The "CN" option ensures the hardware meets specific national standards for explosive atmospheres; check the Field Notification Letter in the Bently Nevada technical library for regional specifics.

• Can this probe be used for Keyphasor applications?

  Yes, the 3300 XL 8 mm ETR probe is suitable for phase reference (Keyphasor) signals provided the target notch meets the minimum depth and width requirements.