MOD: 145655-08| Bently Nevada | 330180-X1-CN Proximitor Sensor

Product Overview

The Bently Nevada 145655-08 (330180-X1-CN) is a specialized vibration monitoring signal conditioner within the 3300 XL series. Serving as the primary interface for eddy current proximity transducer systems, this sensor is designed for critical asset protection in high-speed rotating machinery such as steam turbines, centrifugal compressors, and large industrial pumps. It converts the radio frequency (RF) signal from a proximity probe into a linear voltage output proportional to the distance between the probe tip and the shaft surface. This model is utilized to monitor radial vibration, axial position, and Keyphasor signals, providing essential diagnostic data to machinery protection systems. The inclusion of the 145655-08 modification and CN agency approvals ensures this unit meets specific OEM engineering standards and regional regulatory requirements for hazardous industrial environments.

Suffix Breakdown

The alphanumeric string for the 330180-X1-CN and associated 145655-08 modification designates the following mechanical and electrical configurations:

• 145655-08: A specific OEM modification or factory-authorized revision that defines unique internal component selection or calibrated response characteristics.

• 330180: The base 3300 XL Proximitor Sensor hardware platform.

• X1: System length and mounting configuration. This parameter defines the electrical calibration required to match the total length of the probe and extension cable (typically 5.0 or 9.0 meters) to maintain the specified scale factor.

• CN: China-specific agency approvals. This suffix indicates the unit is certified for use in hazardous locations according to regional electrical and safety standards.

Technical Specifications

FAQs

What is the significance of the 145655-08 modification code?

The 145655-08 modification indicates a specific hardware revision or calibration requested by the machinery manufacturer. When replacing sensors, matching the MOD number is critical to ensure that the channel calibration and frequency response remain consistent with the original system design.

Can this Proximitor be mounted directly to the machine frame?

The 330180-X1-CN should be installed in a protective enclosure or on a mounting rail that provides electrical isolation. Direct mounting to a machine frame that has a different ground potential than the monitoring system common can introduce noise and signal errors.

What power supply polarity is required for the 330180 series?

Like all Bently Nevada proximity systems, the 330180-X1-CN requires a negative DC power supply, typically -24 VDC. Reversing the polarity will prevent the unit from functioning and may lead to internal circuit damage.

Engineering & Installation Guide

Gap Voltage Setup and Calibration

During commissioning, the proximity probe must be physically adjusted to the proper "Gap" relative to the shaft. With power applied to the 145655-08 sensor, monitor the DC voltage between the "OUT" and "COM" terminals. For most 8 mm systems, the probe should be positioned so the sensor outputs approximately -10 VDC. This ensures the shaft is positioned in the center of the sensor's linear range, providing maximum headroom for vibration excursions.

Wiring Integrity and EMI Shielding

To ensure 24/7 reliability of Turbine Supervisory Instrumentation (TSI), the field wiring shield must be connected to the system common at the monitor/rack end only. Avoid "daisy-chaining" shields across multiple Proximitor sensors. The coaxial cable connectors between the probe and the 330180-X1-CN must be insulated using silicone tape or heat-shrink tubing to prevent them from accidentally grounding against the conduit or junction box.

Spare Stock and Replacement Policy

Because the 330180-X1-CN and MOD 145655-08 are calibrated to a specific system length, it is recommended to verify the total cable length (probe + extension cable) before installation. Replacing a 5-meter calibrated sensor with a 9-meter calibrated sensor (or vice versa) will result in a scale factor error of up to 20%, leading to incorrect vibration readings in the DCS or protection system.