Bently Nevada 3300/20-03-03-01-00-00 Dual Thrust Position Monitor
The Bently Nevada 3300/20-03-03-01-00-00 is a dual-channel thrust position monitor within the 3300 Series Turbine Supervisory Instrumentation developed by Baker Hughes, formerly GE Bently Nevada. Utilizing eddy current non-contact measuring technology, this module is designed for continuous online monitoring of shaft axial thrust position on critical rotating machinery. It accurately measures the rotor axial displacement relative to thrust bearings, and identifies early symptoms such as excessive axial load and thrust bearing wear, so as to prevent severe mechanical faults including rotor-stator contact. Featuring two independent input channels and high-precision signal conditioning circuits, it delivers stable and reliable measurement performance. The module supports hot-swap installation on standard 19-inch racks and can be combined with other modules of the 3300 series. Equipped with comprehensive self-diagnostics, it fully complies with API 670 standards and is widely used for condition monitoring of key rotating assets in various industrial sectors. This version is configured without relay outputs or analog outputs.
Description
Bently Nevada 3300/20-03-03-01-00-00 Dual Thrust Position Monitor
Product Overview
The Bently Nevada 3300/20-03-03-01-00-00 is a dual-channel thrust position monitor within the 3300 Series Turbine Supervisory Instrumentation developed by Baker Hughes, formerly GE Bently Nevada. Utilizing eddy current non-contact measuring technology, this module is designed for continuous online monitoring of shaft axial thrust position on critical rotating machinery. It accurately measures the rotor axial displacement relative to thrust bearings, and identifies early symptoms such as excessive axial load and thrust bearing wear, so as to prevent severe mechanical faults including rotor-stator contact. Featuring two independent input channels and high-precision signal conditioning circuits, it delivers stable and reliable measurement performance. The module supports hot-swap installation on standard 19-inch racks and can be combined with other modules of the 3300 series. Equipped with comprehensive self-diagnostics, it fully complies with API 670 standards and is widely used for condition monitoring of key rotating assets in various industrial sectors. This version is configured without relay outputs or analog outputs.
Basic Information
Model number is 3300/20-03-03-01-00-00, manufactured by Bently Nevada, a subsidiary of Baker Hughes. It is classified 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. Power is supplied by the system backplane at -24 VDC with a voltage tolerance of ±10%. The typical weight is approximately 1.0 kg. The protection class is IP20, intended for installation inside indoor control cabinets. The product conforms to CE and RoHS requirements, and meets all specifications of API 670 for rotating machinery monitoring instruments. No relay outputs or analog signal outputs are equipped on this model.
Function & Positioning
This module acts as a dedicated monitoring unit for shaft axial thrust position of rotating machinery, focusing on real-time data acquisition and status tracking of axial displacement. It receives signals from two eddy current proximity probes, and performs signal conditioning and linearization to achieve precise displacement measurement. Operators can configure parameters locally via the front panel keypad or remotely through host software systems. The dual-channel design enables redundant sensor arrangement and improves overall measurement reliability. The built-in self-diagnostic system continuously monitors power supply, internal circuits, probe connection status and signal quality, enabling rapid fault location and maintenance. As a standard component of the 3300 TSI system, it communicates with System 1 software as well as on-site DCS, PLC and SCADA systems to realize data transmission, trend analysis and equipment status management. Since there are no relay outputs, this module is mainly used for pure monitoring and data recording rather than on-site alarm or interlock control.
Core Performance Parameters
This device is fitted with two fully independent thrust position measuring channels. It is compatible with standard Bently Nevada eddy current proximity probes and matching signal conditioners. The standard measuring range is ±1.0 mm, with high overall accuracy and fine resolution to capture minor axial displacement changes steadily. The input impedance of each channel meets industrial standards, and the signal response is fast enough to reflect transient position variations timely. The operating voltage is -24 VDC, and the module maintains low power consumption during operation. There are no relay outputs or analog outputs. The isolation strength between input circuits and power circuits reaches 2500 VAC, providing strong resistance to electromagnetic interference. The operating temperature ranges from 0 °C to 65 °C, and the storage temperature ranges from -40 °C to 85 °C. The applicable relative humidity is 5% to 95%, and condensation is prohibited in the operating environment.
General Compatible Accessories
Compatible accessories include Bently Nevada 3300 XL series and 7200 series eddy current proximity probes, which serve as core sensing devices for displacement signal collection. Matched high-frequency low-noise coaxial cables are applied to connect probes and signal processing units to ensure high-quality signal transmission. Special eddy current signal conditioners are required to work with probes for signal conversion and processing. 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 power for the entire TSI system. Parameter configuration and status inspection can be completed via the local keypad and supporting System 1 host software.
Applicable Equipment & Industries
This monitor is applicable to a wide range of large rotating equipment, including steam turbines, gas turbines and turbo-generator units. 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 deployed in power generation industry for turbine and generator monitoring in thermal power and nuclear power plants. It is used in oil, gas and petrochemical industries to monitor compressors and process pumps under harsh operating conditions. It also serves metallurgy, air separation and chemical industries for monitoring critical high-speed rotating machinery, helping ensure continuous and stable production.
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