Bently Nevada 3300/20-03-01-02-00-00 Dual Thrust Position Monitor

The Bently Nevada 3300/20-03-01-02-00-00 is a dual-channel thrust position monitor within the 3300 Series Turbine Supervisory Instrumentation developed by Baker Hughes, formerly GE Bently Nevada. Adopting eddy current non-contact measurement technology, it is designed for continuous online monitoring of shaft axial thrust position on critical rotating machinery. The module precisely measures the axial displacement of the rotor relative to thrust bearings, and detects early anomalies such as excessive axial load and thrust bearing wear, preventing severe mechanical failures including rotor-stator contact. It features two independent signal input channels and high-performance signal conditioning circuits to ensure accurate and steady measurement. Supporting hot-swap installation on standard 19-inch racks, it can be combined flexibly with other modules of the 3300 series. Integrated comprehensive self-diagnostics enable real-time status supervision of the whole unit. This model has no relay outputs or analog outputs, focusing purely on data acquisition and monitoring. It fully complies with API 670 standards and is widely deployed across multiple industrial sectors.

Model number is 3300/20-03-01-02-00-00, manufactured by Bently Nevada, a brand of Baker Hughes. It is defined as a dual-channel thrust position monitor and belongs to the 3300 Series TSI system. It adopts 19-inch standard rack mounting and supports hot swap during system operation without shutdown. Power is supplied by the system backplane at -24 VDC with a permissible voltage deviation of ±10%. The typical weight is approximately 1.0 kg. The protection class is IP20, suitable for installation inside indoor industrial control cabinets. The product meets CE and RoHS requirements and complies with API 670 specifications for rotating machinery monitoring devices. This version is configured with standard internal electrical isolation, and is not equipped with relay outputs or analog signal outputs.

This module serves as a dedicated monitoring unit for shaft axial thrust position of large rotating machinery, mainly responsible for real-time displacement measurement and operating status tracking. It receives signals from two eddy current proximity probes, and completes signal conditioning, linearization and processing to deliver high-precision detection results. Operators can perform local parameter configuration via the front panel keypad or remote setup through upper computer systems. The dual-channel design allows redundant sensor arrangement, effectively improving the reliability of measured data. The built-in self-diagnostic system continuously monitors power supply, internal circuits, probe connection status and signal quality, facilitating quick fault diagnosis and maintenance. As a standard component of the 3300 TSI system, it establishes communication with System 1 software as well as on-site DCS, PLC and SCADA systems to realize data transmission, trend analysis and equipment status management. Without alarm or interlock relays, this module is applied for pure monitoring, data recording and analysis instead of on-site protection control.

The module is equipped with two fully independent thrust position measuring channels. It is compatible with full range of Bently Nevada standard eddy current proximity probes and matched signal conditioners. The standard measurement range is ±1.0 mm, featuring high accuracy and fine resolution to stably capture tiny axial displacement changes. Each signal channel has high input impedance and fast response speed to timely reflect transient shaft position variations. The operating voltage is -24 VDC, and the overall power consumption remains at a low level. There are no relay outputs or analog outputs. The isolation strength between input circuits and power circuits reaches 2500 VAC, delivering strong electromagnetic interference resistance. The operating temperature ranges from 0 °C to 65 °C, and the storage temperature ranges from -40 °C to 85 °C. The working relative humidity is 5% to 95%, and condensation is strictly prohibited in the operating environment.

Compatible accessories include Bently Nevada 3300 XL series and 7200 series eddy current proximity probes, which act as core sensing elements for displacement signal collection. Matched high-frequency low-noise coaxial cables are used to connect probes and signal processing units to ensure stable and low-distortion signal transmission. Special signal conditioners for eddy current probes are required to cooperate with probes for signal conversion and amplification. The module fits 3300 series standard 19-inch racks and supporting backplanes that provide power supply and system communication bus. The 3300/10 series redundant power supply module can provide stable operating power for the entire TSI system. Local parameter setting and status inspection can be completed via the front panel keypad, while remote management and data analysis rely on the supporting System 1 host software.

This monitor is applicable to various large critical rotating equipment, including steam turbines, gas turbines and turbo-generator sets. It also matches centrifugal compressors, axial compressors, large industrial fans, multi-stage process pumps, high-speed drive motors and turbo expanders. In industrial applications, it is widely used in power generation industry for monitoring turbine and generator units in thermal power and nuclear power plants. It serves oil, gas and petrochemical industries to monitor compressors and process pumps under complex and harsh working conditions. It is also commonly deployed in metallurgy, air separation and chemical industries to monitor key high-speed rotating machinery, ensuring continuous and stable operation of production lines.