BENTLY NEVADA 125680-01 Proximitor I/O Module is specifically designed to be used in conjunction with the 3500/40M Proximitor Monitor, providing sensor signal connection and interface integration for online condition monitoring of rotating machinery. This module is installed at the rear of the 3500 rack and, together with the front 3500/40M monitoring module, forms a complete vibration monitoring channel. It can be connected to eddy current displacement sensors (Proximity Transducers) and related extension cables to achieve continuous monitoring of key mechanical parameters such as shaft vibration, shaft displacement, eccentricity, and differential expansion.
As an important component of the 3500 Machinery Protection System, this module is compatible with the Bently Nevada 3500 Rack architecture and can be configured together with the 3500 Rack Configuration Software to provide standardized interfaces for equipment maintenance, spare part replacement, system expansion, and long-term maintenance.
Technical Specifications
| Product Name | 125680-01 |
| Manufacturer | Bently Nevada |
| Series | 3500 Series |
| Module Type | Proximitor I/O Module |
| Configuration | Internal Terminations |
| Compatible Monitor | 3500/40M |
| Channels | 4 |
| Signal Input | Proximity Transducer |
| Installation | 3500 Rack |
| Dimension | 26*16*5cm |
| Weight | 0.34kg |
| Country of Origin | USA |
| Condition | New Original |
| Warranty | 12 Months |
| Shipping | DHL FedEx UPS TNT |
| HS code | 9032900090 |
Inputs
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Signal
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Accepts from 1 to 4 proximity transducer signals
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Power Consumption
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7.7 watts, typical
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Input Impedance
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Standard I/O
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10 kΩ (Proximitor and acceleration inputs
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TMR I/O
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The effective impedance of three bussed TMR I/O channels wired in parallel to one transducer is 50 kΩ
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Sensitivity
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Radial Vibration
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3.94 mV/μm (100 mV/mil) or
7.87 mV/μm (200 mV/mil)
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Thrust
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3.94 mV/μm (100 mV/mil) or
7.87 mV/μm (200 mV/mil)
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Eccentricity
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3.94 mV/μm (100 mV/mil) or
7.87 mV/μm (200 mV/mil)
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Differential Expansion
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0.394 mV/μm (10 mV/mil) or
0.787 mV/μm (20 mV/mil)
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REBAM
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40 mV/μm (1000 mV/mil) or
80 mV/μm (2000 mV/mil)
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Outputs
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Front Panel LEDs
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OK LED
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Indicates when the 3500/40M SIL Proximitor is operating properly.
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TX/RX LED
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Indicates when the 3500/40M SIL Proximitor is communicating with other modules in the 3500 rack.
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Bypass LED
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Indicates when the 3500/40M SIL Proximitor is in Bypass Mode
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Buffered Transducer
Outputs
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The front of each monitor has one coaxial connector for each channel.
Each connector is short-circuit protected.
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Output Impedance
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550 Ω
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Transducer
Power Supply
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-24 Vdc
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Key Features
Designed specifically for Bently Nevada 3500/40M Proximitor Monitor
Internal Termination (internal wiring) structure, suitable for internal terminal connections in the rack
Supports 4 independent monitoring channels (Four Channels)
Receives input signals from the 3300 series eddy current sensors (Proximitor System)
Fully compatible with 3500 Rack and 3500 Rack System
Supports shaft vibration (Radial Vibration) monitoring
Supports axial displacement (Thrust Position) monitoring
Supports differential expansion (Differential Expansion) monitoring
Supports eccentricity (Eccentricity) monitoring
Supports REBAM (Rotor Bow) measurement application
Supports online continuous mechanical condition monitoring
Post-installation method, convenient for maintenance and replacement
Can be applied to new projects, spare parts inventory, and downtime maintenance projects
Supports global industrial automation and rotating machinery protection systems
How Does the 125680-01 Work?
125680-01 is not an independent monitoring module on its own; instead, it is an I/O interface module for the 3500/40M monitor. Its main function is to establish a data connection between the on-site sensor signals and the monitoring module within the 3500 rack, thereby establishing a stable input and output channel for the entire monitoring system.
The 3300 XL eddy current probe installed on site continuously collects the operating status signals of the equipment, which are transmitted via the extended cable to the Proximitor. Then, the 125680-01 completes the signal connection to the 3500/40M monitoring module. The monitor conducts real-time analysis of the collected data, capable of calculating parameters such as shaft vibration, axial displacement, eccentricity, differential expansion, and Rotor Bow. It also outputs alarm or shutdown protection signals based on the alarm values set by the system.
Since 125680-01 adopts the Internal Termination structure, all on-site wiring is located inside the rack, which is suitable for centralized wiring projects within the control cabinet.
Compatible With
BENTLY NEVADA 125680-01 can be applied to the following equipment and systems:
Bently Nevada 3500 Rack
As a 3500 series standard I/O module, it can be directly installed in the 3500 rack and,d together with the corresponding monitoring module, form a complete monitoring channel.
3500/40M Proximitor Monitor
125680-01 is specifically designed for the 3500/40M monitor. Both devices must be installed together as they cannot be used separately.
3300 XL Proximitor System
The complete measurement chain is composed of the 3300 XL 8 mm eddy current probe, Proximit, or an extension cable.
3500 Rack Configuration Software
System parameters, alarm values, and channel configurations can all be set through the 3500 configuration software.
The Difference Between Internal Termination and External Termination
| Comparison Item | Internal Termination | External Termination |
|---|---|---|
| Wiring Location | Inside the rack | External terminal blocks |
| Control Cabinet Wiring | Centralized internal wiring | External field wiring |
| Installation Method | Rear-mounted installation | External terminal connection |
| Maintenance | Suitable for standard control cabinets | Easier for on-site maintenance |
| Typical Applications | OEM equipment, integrated control cabinets | Large-scale field installation projects |
FAQ
Q: Is it necessary to reconfigure the software after installing 125680-01?
A: If the replacement is of the same model module and the system configuration remains unchanged, generally there is no need to re-establish the configuration file.
After the installation is completed, it is recommended to use the 3500 Rack Configuration Software to check the module identification status, channel parameters, and alarm settings, and conduct necessary functional verifications to ensure that the system resumes normal operation.
Q: When purchasing spare parts, do we need to replace the 3500/40M Monitor at the same time?
A: Usually not necessary.
If the on-site fault is confirmed to be from the I/O module, only replacing 125680-01 is necessary. If the monitoring module is functioning properly, generally there is no need to replace the Monitor simultaneously. However, for devices with a long operating time, some factories will, according to the annual maintenance plan, prepare both the Monitor and the I/O Module as spare parts at the same time to improve maintenance efficiency.
Q: What is the packaging method for the product?
A: All products are packed with anti-static materials, and additional cushioning protection materials are added according to the mode of transportation. For international shipping orders, generally, thick cardboard boxes are used for packaging; if the quantity of products is large or the transportation distance is long, wooden boxes can be provided as needed to reduce the risk of impact or compression during transportation.
Q: Are you providing a brand-new product or a repair part?
A: We can offer products in different states based on the inventory situation, including:
New and original brand-new version
Original factory-sealed packaging
Unused inventory items
All products will undergo appearance inspection and model verification before shipment to ensure that the model matches the order. If the customer has any special requirements, we can also provide product photos for confirmation.
Our Supply Capability
We have been supplying spare parts for the Bently Nevada 3500 series monitoring system for a long time, including 3500 monitoring modules, I/O modules, power modules, communication modules, and related accessories. We can provide inventory inquiries, product images, model confirmation, and global shipping services.
For equipment maintenance, system expansion, and long-term spare parts procurement projects, we can provide matching models, delivery cycle confirmation, and export packaging solutions based on customer requirements, assisting the procurement team in completing the spare parts planning and on-site maintenance tasks.