126615-01 3500/40M Proximitor Monitor Module is a four-channel preamplifier monitoring module (Proximitor Monitor Module) in the Bently Nevada 3500 series mechanical protection system. It is mainly used to receive dynamic and static signals output by the eddy current sensors (Proximitor System) and to continuously monitor the operating status of rotating machinery. The module is installed at the front of the 3500 frame and is used in conjunction with the corresponding I/O module to achieve real-time measurement of parameters such as shaft vibration, axial displacement, eccentricity, differential expansion, and Rotor Bow (rotor bending), and to output alarm or protection signals based on the alarm values set by the system.
For users who have deployed the 3500 series system, BENTLY NEVADA 126615-01 is one of the common spare parts models. It is suitable for equipment maintenance, system upgrades, and inventory spare parts procurement. It is also the 3500/40M Monitor Module that many industrial enterprises prioritize for stock during their annual maintenance.
| Technical Specifications | |
| Product Number | 126615-01 |
| Product Name | Proximitor Monitor Module |
| Manufacturer | Bently Nevada |
| Series | 3500 Series |
| Model | 3500/40M |
| Channels | 4 |
| Module Type | Monitor Module |
| Supported Sensor | Proximitor System |
| Rack | 3500 Rack |
| Alarm | Programmable |
| OK Relay | Supported |
| Front Display | LED |
| Hot Replace | According to the system procedure |
| Configuration | 3500 Rack Software |
| Power Supply | Rack Powered |
| Installation | Front Slot |
|
Dimension |
26*16*5cm |
|
Weight |
0.34kg |
| Origin | USA |
| Condition | New Original |
| Warranty | 12 Months |
| Shipping | DHL UPS FedEx |
| HS code | 8504902000 |
|
Input Signal |
-10 Vdc to +10 Vdc |
|
Power Consumption |
10.5 Watts |
|
Product Type |
Proximitor Monitor Seismic I/O Module |
|
Ethernet |
100Base-FX Fiber |
|
Operating Temperature |
-30°C to +65°C (-22°F to +150°F) |
|
Input Voltage |
24VDC |
|
Input Current |
5 Amps |
|
Outputs |
8 Analog Channels, 8 Digital Channels |
|
Storage Temperature |
-40°C to +85°C |
|
Humidity |
5% to 95% (non-condensing) |
|
Ingress Protection |
IP67 |
3500 Series Standard Four-Channel Proximitor Monitor Module
Support continuous online mechanical condition monitoring
Support for the 3300 XL Proximitor System input
Programmable alarm and dangerous value setting
Support radial axis vibration monitoring
Front panel LED status display
Support axial displacement (Thrust Position) monitoring
Support 3500 Rack Configuration Software configuration
Support differential expansion monitoring
Compatible with the 3500 Rack standard frame
Support eccentricity measurement
Can be used for equipment upgrades, system expansions, and spare parts replacements
Working Principle
BENTLY NEVADA 126615-01 3500/40M Proximitor Monitor Module is the core monitoring unit in the 3500 mechanical protection system. It is responsible for collecting, processing, and analyzing the dynamic and static signals from the eddy current sensors (Proximitor System) and outputs corresponding status information according to the preset alarm logic. The module adopts a four-channel independent monitoring architecture. Each channel can be independently configured according to the actual working conditions and can simultaneously complete multiple monitoring tasks such as vibration, displacement,t and rotor status, and is suitable for large-scale rotating machinery in continuous operation.
The Proximitor Monitor Module receives the voltage signals output by the 3300 XL series eddy current probes. After that, it completes signal conditioning, which includes filtering, amplification, linear correction, and digital conversion, etc., to improve measurement accuracy and data consistency. The processed signals are then calculated by the internal processor of the module in real time and converted into corresponding mechanical status data, such as radial shaft vibration (Radial Vibration), axial displacement (Thrust Position), eccentricity (Eccentricity), differential expansion (Differential Expansion), and Rotor Bow, etc. All monitoring data are updated continuously in real time and can continuously reflect the operating status of the equipment without the need for manual intervention.
In terms of alarm management, the module supports four independent monitoring channels (4 Independent Monitoring Channels). Each channel can separately set Alert and Danger alarm values, and also supports the OK status detection function. When any monitoring parameter exceeds the set threshold, the system will output alarm information according to the preset logic and complete data communication through the 3500 rack and the TDI (Transient Data Interface) module. The real-time monitoring data will be uploaded to the upper-level monitoring system, DCS, or equipment status management platform to achieve operation trend analysis, alarm records, and maintenance decision support.
From the perspective of the system architecture, this module not only handles the sensor signal processing tasks but is also responsible for the key calculation steps in the mechanical protection logic. By synchronously analyzing dynamic vibration signals, static gap voltage (Gap Voltage), and position change data, it can provide continuous state monitoring for key equipment such as gas turbines, steam turbines, centrifugal compressors, generators, and large motors. Combined with the 3500 series communication module, relay module, and control system, it can further achieve alarm interlock, equipment protection, and operation status management, meeting the application requirements of long-term online monitoring of mechanical protection systems in industrial sites.
Installation Guide:
Pre-installation Preparation
Verify the product model 126615-01;
Confirm the 3500 Rack configuration;
Check the model of the accompanying I/O module;
Confirm the connection status of on-site probes and cables.
Installation steps:
1. Shut down the 3500 system power;
2. Install 126615-01 into the designated slot;
3. Check the connection status of the Monitor and I/O module;
4. Power on the system;
5. Use the 3500 Configuration Software to confirm the parameters;
6. Verify the alarm and monitoring functions.
Debugging suggestions
After the installation is completed, it is necessary to check the status of each channel, the input signals of the probes, and the alarm logic. Only after confirming that the monitoring data is normal can it be put into operation.
The signal acquisition and processing procedure in the API 670 system
In large rotating equipment, electric eddy current probes (Eddy Current Proximity Probes) are commonly used to continuously measure the operating status of the shaft system.
A typical signal path is as follows:
Proximity Probe → Extension Cable → Proximitor Sensor → 126615-01 Monitor Module → 3500 Rack → Protection System
The on-site probes detect the changes in the gap between the rotating shaft and the probe, converting mechanical displacement into electrical signals. After the signal is converted by the Proximitor Sensor, it is received and processed by 126615-01.
The module internally, based on the 3500/40M configuration parameters, processes the input signal as follows:
Signal conditioning (Signal Processing)
Data conversion (Signal Processing)
Engineering unit conversion (Engineering Quantity Calculation)
Alarm comparison (Alarm Comparison)
Status monitoring (Status Diagnosis)
API 670 mechanical protection systems typically require that the monitoring module have a clear signal processing path and maintenance method. 126615-01 is installed in the Bently Nevada 3500 Rack and can be configured with different monitoring channels according to project requirements.
The information that needs to be confirmed when purchasing 126615-01 for the API 670 project
If this module is used for projects related to API 670, it is recommended to confirm the following before procurement:
Current 3500 system model;
Monitoring function requirements (vibration, displacement, differential expansion, etc.);
The model of the Proximitor probe used;
I/O module type (Internal or External Termination);
3500 Rack configuration;
Original module Part Number;
System software version.
FAQ
Q: 126615-01 How to handle the signals from the Proximitor sensor?
A: 126615-01 receives the analog voltage signal output from the Proximitor Sensor and completes the data conversion through the internal signal processing circuit.
The signal processing process mainly includes:
Receive the output signal from the probe;
Complete the signal conditioning of the input;
Conduct digital conversion;
Calculate the engineering value based on the channel configuration;
Compare with the alarm threshold;
Output the monitoring status.
Q: How is the alarm function of 126615-01 implemented?
A: 126615-01 supports alarm logic settings based on channel parameters.
Each monitoring channel can usually be set to:
Alert Level (Warning Value)
Danger Level (Danger Value)
OK Status Check
Q: 126615-01 Can product information be provided before shipment?
A: According to the requirements of the client's project, the following can be provided:
Product photos;
Model confirmation information;
Packing information;
Commercial invoice;
Packing list;
Export-related documents.