BENTLY 128275-01-E

Description

Detailed parameter table

Product introduction

The 128275-01-E from Bently Nevada is a complete eddy current proximity sensor system consisting of a precision probe and integrated driver, designed as a versatile measurement solution for 3500 Machinery Protection Systems. This integrated system directly measures shaft vibration, axial position, and runout in rotating machinery, providing conditioned output signals that form the foundation of comprehensive machinery health monitoring. Bently Nevada’s 128275-01-E serves as a critical measurement subsystem, converting physical displacement into reliable electrical signals that, when transmitted through 163179-01 extension cables to processing modules, enable both real-time protection and long-term performance analysis.

Bently Nevada’s 128275-01-E addresses the need for flexible, high-performance non-contact measurement across diverse industrial applications. Its modular design combines a rugged field-mounted probe with a rack-mountable driver, providing signal conditioning close to the measurement point to minimize noise interference. When paired with 136188-01 signal input modules, this system delivers stable, calibrated measurements that appear on 3500/60 displays, supporting informed decision-making for both operational and maintenance teams.

Core advantages and technical highlights

Extended measurement range: The 128275-01-E offers an expanded 0-5 mm measurement range—more than double that of standard 2 mm probes—making it ideal for applications requiring monitoring of larger shaft movements, such as axial position in turbines or thermal expansion in large rotating equipment. This extended range provides greater flexibility in machinery design and installation while maintaining measurement precision.

Integrated signal conditioning: Unlike basic probe assemblies, this system includes a dedicated driver that provides excitation, signal amplification, and conditioning close to the measurement point. This localized processing improves signal-to-noise ratio, particularly over longer cable runs, ensuring measurement integrity even in electrically noisy environments common in power generation and processing facilities.

Dual-material compatibility: The system’s configurable driver allows precise measurement of both ferrous and non-ferrous target materials, eliminating the need for different sensor types when monitoring machinery with mixed metallurgy. This versatility simplifies inventory management and reduces installation errors in complex facilities with diverse equipment.

Enhanced environmental resilience: The 316 stainless steel probe maintains performance in extreme temperatures from -55°C to +177°C and features an IP68 rating for protection against dust and water ingress. The driver module includes surge protection and conformal coating, ensuring reliable operation in harsh industrial environments where vibration, temperature fluctuations, and electrical noise are prevalent.

BENTLY 128275-01-E

Typical application scenarios

In large steam turbine installations, the 128275-01-E monitors axial thrust bearing position and rotor vibration across the extended range required for thermal expansion during startup and shutdown cycles. The probe installed in the turbine casing measures shaft movement, while the driver mounted in a nearby junction box conditions the signal before transmission via 163179-01 cables to the main control room. Processed data appears on 3500/60 displays, allowing operators to monitor thermal growth and detect abnormal axial movement that could indicate bearing degradation.

Oil refineries utilize the 128275-01-E in centrifugal compressor monitoring systems, where its extended range accommodates the larger shaft movements common in these machines. The system’s ability to measure non-ferrous alloys makes it suitable for monitoring aluminum or copper alloy components, while its rugged probe construction withstands the high temperatures and hydrocarbon exposure typical in refining environments. Measurements integrate with the 3500 system to provide early warning of impeller imbalance or seal wear.

Heavy manufacturing facilities deploy the 128275-01-E on large rotating equipment such as paper machine rolls and steel mill motors, where its extended range monitors both vibration and thermal expansion. The system’s driver mounted in control cabinets provides stable output signals to 136188-01 modules, with data displayed on 3500/60 screens for operators. Maintenance teams use the trend data to schedule preventive interventions before unexpected equipment failure disrupts production.

Related model recommendations

163179-01 (Bently Nevada): Extension cable connecting 128275-01-E probes to drivers.

136188-01 (Bently Nevada): Signal input module processing 128275-01-E outputs.

3500/60 (Bently Nevada): Display module visualizing data from 128275-01-E systems.

3500/05-01-02-00-00-01 (Bently Nevada): Power supply for driver modules.

330130-080-00-00 (Bently Nevada): Calibration fixture for system verification.

128276-011 (Bently Nevada): Complementary 2 mm range probe for multi-point monitoring.

3500/20 (Bently Nevada): Rack housing driver interface electronics.

125388-01H (Bently Nevada): HMI displaying trends from 128275-01-E measurements.

Installation, calibration and maintenance instructions

Installation preparation: Before installing the 128275-01-E, verify the measurement range (0-5 mm) suits the application requirements and that the target material is compatible. Select probe mounting locations that provide a clear line of sight to the measured surface with minimal obstructions. Position the driver module in a protected environment within 10 meters of the probe, ensuring ambient temperatures remain within 0°C to +60°C. Required tools include non-magnetic feeler gauges, torque wrench, and calibration equipment.

Mounting procedure: Secure the probe in its mounting bracket using specified hardware, torquing to 2.0 Nm (17.7 in-lbs) to prevent loosening under vibration. Set the initial gap between 1.5 mm and 3.5 mm using non-magnetic feeler gauges, ensuring the probe tip is parallel to the target surface within 0.5°. Mount the driver module on a DIN rail in a control cabinet, connecting power (24 VDC from 3500/05-01-02-00-00-01) and signal outputs to the 136188-01 module. Connect probe to driver using 163179-01 extension cables, ensuring proper connector alignment.

Calibration process: After installation, calibrate the system using the 330130-080-00-00 fixture to verify linearity across the 0-5 mm range. Configure the driver for the target material using DIP switches or software tools. Apply known gap values and record output voltages, confirming they fall within ±5% of the calibrated range. Perform a temperature stability check if operating in extreme environments. Document all calibration data and store with system records.

Maintenance suggestions: Include the 128275-01-E in quarterly inspections, checking probe mounting security, cable integrity, and driver status indicators. Clean the probe tip with a soft cloth if contamination is visible—avoid abrasives that could damage the sensing surface. During scheduled shutdowns, recheck the gap setting and verify calibration using the 3500/60 display. Inspect driver connections for corrosion and ensure cooling vents remain unobstructed. Replace probes if output signals become non-linear or if physical damage is detected.

Service and guarantee commitment

Bently Nevada provides the 128275-01-E with a 36-month warranty covering manufacturing defects and performance issues for both probe and driver components under normal operating conditions. Our technical support team offers specialized guidance on system installation, material configuration, and calibration procedures to ensure optimal integration with 163179-01 cables and 136188-01 modules.

We offer comprehensive training on eddy current system principles, installation best practices, and troubleshooting techniques specific to the 128275-01-E. Beyond the warranty period, our service agreements include system recalibration, performance verification, and expedited replacement services for both probe and driver components. Bently Nevada’s commitment to quality ensures the 128275-01-E delivers reliable measurement data throughout its operational lifecycle, backed by our global network of service professionals.