Product Overview
The 3500/34 125696-01 is a precision position monitor module within Bently Nevada’s 3500 Machinery Protection System, specialized in monitoring critical axial and radial position parameters of rotating equipment. As a key component of the 3500 series, this module is engineered to track shaft movement—particularly thrust position, which directly indicates the health of thrust bearings, one of the most vulnerable components in high-speed machinery.
In industrial setups, the 3500/34 125696-01 acts as a safeguard against catastrophic failures, converting raw sensor data into actionable insights that alert operators to excessive axial movement, a precursor to bearing damage or rotor contact. Its seamless integration with the 3500 chassis and compatibility with interface modules like the 3500/20 ensures this critical data reaches control systems in real time. What sets the 3500/34 125696-01 apart is its combination of high accuracy and rugged reliability, performing consistently in harsh environments with temperature swings, vibration, and electrical noise. Whether monitoring a gas turbine in a power plant or a centrifugal compressor in a refinery, the 3500/34 125696-01 is indispensable for maintaining equipment integrity and minimizing downtime.
Technical Specifications
| Parameter |
Value |
| Product Model |
3500/34 125696-01 |
| Manufacturer |
Bently Nevada |
| Product Type |
Axial/Radial Position Monitor Module (3500 System) |
| Input Channels |
4 (proximity probe inputs) |
| Measurement Range |
0 to 25 mm (axial position), ±12.5 mm (radial position) |
| Output Signals |
4-20 mA analog, digital relay outputs (alert/trip) |
| Operating Temperature |
-5°C to 65°C (23°F to 149°F) |
| Dimensions |
152 mm x 102 mm x 229 mm (H x W x D) |
| Mounting Type |
Rack-mounted in 3500 System Chassis |
| Compatibility |
3500/05 Power Supply, 3500/20 Interface Module, 3301 Series Probes |
| Diagnostic Features |
Sensor fault detection, signal drift alerts, self-test |
| Protection Rating |
IP20 (dust-resistant, chassis-mounted) |
| Certifications |
CE, UL 508, ATEX II 3G Ex nA IIC T4 Gc |
Key Features and Benefits
The 3500/34 125696-01 stands out for its precise measurement of axial and radial position, with a range that covers the full spectrum of movement in large rotating machinery. This accuracy is critical for detecting thrust bearing wear—a leading cause of turbine and compressor failures—by tracking subtle shifts in shaft position that precede catastrophic damage.
Its four-input design allows the 3500/34 125696-01 to monitor multiple points on a single rotor, providing a comprehensive view of positional stability. For example, in a gas turbine, it can track both axial thrust from combustion pressure and radial movement from rotor imbalance, correlating data to identify root causes of wear.
Integrated diagnostics enhance reliability: the 3500/34 125696-01 continuously checks for probe faults, signal drift, or wiring issues, ensuring operators receive trustworthy data. Its compatibility with the 3500 chassis and 3500/20 interface simplifies integration, while its rugged construction—resistant to temperature extremes and electrical noise—ensures consistent performance in harsh environments like refineries and power plants.
Application Scenarios
The 3500/34 125696-01 is essential in industries where positional stability is critical. In power generation, it monitors steam turbine axial position, tracking thrust from steam pressure that can wear thrust bearings. For example, in a combined-cycle plant, if the turbine shaft shifts axially by more than 0.5 mm, the 3500/34 125696-01 triggers an alert, allowing operators to adjust load and prevent bearing failure.
In oil and gas, the 3500/34 125696-01 safeguards centrifugal compressors, where high pressure differentials cause axial movement. It detects shifts that indicate worn impeller seals, enabling maintenance before gas leaks or rotor contact occur. Its ATEX certification makes it ideal for offshore platforms, where explosive atmospheres demand reliable monitoring.
Chemical processing plants use the 3500/34 125696-01 to monitor pump shafts, ensuring radial position stays within limits to prevent seal damage and fluid leaks. By correlating positional data with vibration readings from other 3500 modules, it provides a complete picture of machinery health.
Related Models
3500/34 125696-02 – 8-channel variant for monitoring larger rotors with multiple measurement points.
3500/34 125695-01 – Previous generation model with a narrower measurement range (0 to 15 mm axial).
3500/05 – Power supply module that provides stable power to the
3500/34 125696-01 in the 3500 chassis.
3500/20 – Interface module that transmits data from the
3500/34 125696-01 to DCS/SCADA systems.
330101-00-25-20-12-05 – Proximity probe optimized for use with the
3500/34 125696-01.
3500/33 – Relay module that expands the
3500/34 125696-01’s output capabilities for complex safety sequences.
3500/92 – 3500 chassis backplane, essential for mounting and connecting the
3500/34 125696-01.
Installation and Maintenance
Installation of the 3500/34 125696-01 requires mounting it in an available slot within the 3500 chassis, ensuring a secure backplane connection for power and communication. Proximity probes must be calibrated to the module’s range and wired with shielded cables, routed away from high-voltage lines to avoid interference. Proper grounding of both the module and probes is critical for measurement accuracy. The chassis should be installed in a dry, well-ventilated area to maintain temperatures within the -5°C to 65°C range.
Maintenance for the 3500/34 125696-01 includes quarterly inspections of terminal connections and probe alignment, as misalignment can skew readings. Annual calibration using Bently Nevada tools ensures measurement precision. The module’s self-test feature should be run monthly to verify diagnostic functionality. Cables should be checked for wear, with replacements made promptly. For critical applications, replace the module every 10 years to maintain reliability.
Product Warranty
The 3500/34 125696-01 is backed by a one-year warranty from Xiamen Xiongba E-commerce Co., Ltd., covering manufacturing defects and offering free replacement of faulty units. This warranty reflects confidence in the product’s quality, built on Bently Nevada’s reputation for durable industrial components. Our global support team provides timely assistance with installation, calibration, and troubleshooting, ensuring minimal downtime for your 3500 system. We stand behind the 3500/34 125696-01, committed to keeping your machinery protection systems reliable and effective.
Company Introduction
Xiamen Xiongba E-commerce Co., Ltd. Branch specializes in the field of industrial automation, focusing on the sales of Distributed Control Systems (DCS), robot systems, and modules and spare parts for large-scale servo control systems. Our business covers a wide range of industrial automation products, including PLCs, MOTOROLA MVME industrial modules, Anybus communication converters, RTU remote modules, industrial PCs, low-frequency industrial displays, and SCSI human-machine interfaces. With over a decade of industry experience, Xiongba has grown into a global supplier of industrial automation spare parts. We source directly from overseas, offering products and parts from multiple countries and manufacturers. This helps solve customers' procurement challenges, ensures product quality, and provides a significant price advantage. We offer a one-year warranty and free replacement service.
