The Bently Nevada 3500/45 140072-02 + 140072-04 Position Monitor is a high-performance module designed for precise axial position and rod position measurement in rotating and reciprocating machinery. As part of the proven 3500 Machinery Protection System, it provides continuous monitoring of shaft axial displacement, thrust position, and rod position to ensure early detection of misalignment, thrust bearing wear, or mechanical shift.

This monitor utilizes advanced digital signal processing to deliver accurate position readings, configurable alarm logic, and reliable system protection. It integrates seamlessly into the 3500 rack platform, supporting centralized data acquisition and plant-wide condition monitoring.

Designed for industrial environments, it offers robust performance under extreme conditions, making it a trusted choice in power generation, oil and gas, petrochemical, and other process industries.

Product Specifications

Product Applications

The 3500/45 Position Monitor is widely applied in industries requiring precise axial position measurement for machinery protection, including:

• Steam Turbines – Monitoring thrust position to detect axial movement caused by bearing wear.

• Gas Turbines – Ensuring thrust bearings remain within safe operational limits.

• Centrifugal Compressors – Protecting against axial displacement due to process instability.

• Reciprocating Compressors – Measuring rod position to detect crosshead wear and alignment issues.

• Industrial Pumps – Detecting shaft axial drift that can lead to seal or bearing failure.

• Gearboxes – Monitoring axial shaft position to identify early-stage gear wear or misalignment.

Product Advantages

• High Accuracy Measurement – Micrometer-level precision for critical machinery protection.

• Multiple Sensor Compatibility – Works with various proximity probe systems for flexible installation.

• Advanced Alarm Logic – Independent Alert and Danger setpoints for proactive protection.

• Seamless Rack Integration – Fully compatible with the 3500 rack monitoring platform.

• Industrial-Grade Reliability – Performs consistently in high-vibration, high-temperature environments.

• Predictive Maintenance Support – Supplies both instantaneous position readings and long-term trend data.

FAQ

1. What primary functions does the 3500/45 Position Monitor perform?

   It measures axial, rod, and thrust positions to protect machinery from misalignment and bearing wear.

2. What sensor types are compatible with the module?

   It supports proximity probes such as the 3300 XL series and other Bently Nevada eddy current probes.

3. Can it monitor both static and dynamic position changes?

   Yes, it can capture both slow drift and rapid displacement changes in shaft position.

4. How are alarm thresholds configured?

   Alert and Danger setpoints are independently programmable through the 3500 Configuration Software.

5. What is the maximum frequency response?

   The module supports a DC to 10 kHz response, depending on the sensor used.

6. Does it provide proportional outputs?

   Yes, it outputs 4–20 mA proportional to the measured position.

7. Is buffered output available?

   Yes, buffered outputs allow direct connection to portable analyzers without interrupting system monitoring.

8. Can it be hot-swapped?

   Yes, it can be replaced without powering down the 3500 rack system.

9. Is it certified for hazardous locations?

   Yes, with the correct configuration it meets ATEX, IECEx, and CSA hazardous area standards.

10. What is its sampling capability?

    It supports up to 1024 samples per channel per second for precise measurement.