The Bently Nevada 3500/45 is a dedicated four-channel precision position monitoring module tailored exclusively for Turbine Supervisory Instrumentation (TSI) and critical rotating machinery displacement protection within the 3500 rack system. Unlike vibration modules that track dynamic mechanical oscillation, this hardware focuses on static and micro-displacement position changes of core equipment components, capturing subtle axial and radial position deviations that directly reflect turbine operational health. Compatible with industry-standard Proximitor proximity probes, LVDT sensors and rotary potentiometers, it delivers high-resolution continuous position measurement for thrust position, differential expansion, casing expansion and valve position parameters. As a core foundational module for steam turbine safety monitoring, it converts tiny mechanical displacement variations into quantifiable data, helping operators detect rotor thrust abrasion, casing thermal expansion anomalies and structural offset faults at the earliest stage.

1. Core Technical Specifications

Module Type：3500/45 4-Channel Multi-Function Position Monitor Module

System Compatibility：Bently Nevada 3500 series machinery protection rack system

Channel Configuration：4 independent high-precision position monitoring channels

Supported Sensors：Proximitor eddy-current probes, AC/DC LVDT, rotary potentiometers

Monitoring Parameters：Thrust position, differential expansion, case expansion, valve position displacement

Measurement Sensitivity：High-precision customizable sensitivity for micro-displacement detection

Measurement Accuracy：≤0.5% full-scale precision for stable long-term monitoring

Signal Processing：Built-in adaptive signal conditioning and anti-ground loop interference circuit

Alarm Function：Custom configurable warning, danger trip and sensor fault alarm thresholds

Structure Specification：Full-height front module + full-height rear I/O module dual-slot structure

Operating Temperature：-30℃ ~ +65℃ industrial working range

Storage Temperature：-40℃ ~ +85℃

Certification：Class I Div 2, CSA, ATEX, IECEx full hazardous area compliance

2. Official Ordering Selection & Front/Rear Board Matching

Standard Ordering Model：3500/45-AA-BB-CC

AA Code: Sensor Input Type Configuration

BB Code: Precision & Filter Grade

CC Code: Safety Certification Grade

Front & Rear Board Official Matching List

3. Core Product Advantages

The 3500/45 occupies an irreplaceable core position in TSI turbine monitoring systems with its professional multi-dimensional displacement monitoring capability, filling the gap of precision position detection in general vibration monitoring modules. Its four independent channels support simultaneous collection of four different position parameters, realizing integrated monitoring of turbine thrust, casing expansion and valve displacement with a single module, effectively simplifying rack layout and reducing system construction costs. Equipped with exclusive ground loop suppression circuits, the module completely eliminates common signal drift faults caused by equipment potential difference, ensuring long-term stable and accurate micro-displacement data output. It supports flexible multi-mode expansion logic including single-ramp, dual-ramp and complementary differential expansion measurement, adapting to different types of steam turbine structural characteristics and operating modes. The module features ultra-low measurement drift after long-term continuous operation, requiring minimal regular calibration, and its industrial-grade shielding structure resists harsh factors such as on-site high temperature, vibration and electromagnetic interference, greatly improving the reliability of turbine safety protection systems.

4. Industrial Application Scenarios

Primarily deployed in steam turbine TSI monitoring systems across thermal power, cogeneration and heavy industrial enterprises, the 3500/45 is a mandatory core module for large turbine unit safety supervision. It precisely tracks rotor axial thrust displacement to prevent thrust tile wear and rotor collision failures caused by abnormal thrust movement. The module monitors thermal differential expansion between turbine rotors and casings in real time, avoiding unit vibration and friction damage induced by inconsistent thermal expansion coefficients. Additionally, it accurately collects casing absolute expansion and regulating valve position data, providing key data support for unit load adjustment and thermal state judgment. In petrochemical large-scale compressor units and industrial high-speed rotating equipment, it also serves as an important supplementary monitoring unit for mechanical position status, ensuring the safe and stable operation of high-value rotating equipment.