Overview
The Bently Nevada 3500/42 125672-02, also cataloged as the 3500/42 Proximitor/Seismic Monitor Module, provides four-channel signal conditioning for proximity and seismic inputs within the 3500 Machinery Protection System. It accepts signals from up to four proximity transducers and processes measurement data for machinery condition monitoring.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/42 125672-02 |
| Spare Model | 3500/42 |
| Product Type | Proximitor/Seismic Monitor Module |
| Brand | Bently Nevada |
| Manufacturer | Bently Nevada |
| System | 3500 Machinery Protection System |
| Channel Count | 4 channels |
| Input Type | Proximity and seismic transducer signals |
| Signal Inputs | 1 to 4 proximity transducers |
| Gap Filter | -3 dB at 0.09 Hz |
| Smax | 0.125 to 15.8 times running speed |
| 1X and 2X Vector Filter | Constant Q filter |
| Stopband Rejection | Minimum -57.7 dB |
| Standard | 10 kOhm |
| Output Impedance | 550 Ohm |
| Voltage Compliance | 0 to +12 VDC across load |
| Power Consumption | 7.7 W typical |
| Origin | USA |
| Weight | 1.26 kg |
| Estimated Shipping Dimensions | 5.5 x 29 x 23 cm |
| Tariff Code | 8537101190 |
| Shipment Origin | Xiamen, China |
Eddy-Current Probe Signal Processing
The 3500/42 accepts proximity transducer signals and conditions the input for machinery monitoring. The four-channel architecture allows the module to process individual probe channels within the rack-mounted 3500 system.
For eddy-current probe applications, correct probe scaling depends on the installed transducer system and target characteristics. Therefore, technicians should verify the probe gap voltage before commissioning and confirm that the measured electrical bias corresponds to the configured monitoring range.
The module also provides gap filtering with a -3 dB point at 0.09 Hz. Additionally, its 1X and 2X vector filtering uses a Constant Q filter with a minimum stopband rejection of -57.7 dB. These filtering characteristics support separation of selected rotational components from other signal content.
The specified Smax range extends from 0.125 to 15.8 times running speed. Consequently, configuration should match the monitored machine’s rotational characteristics and the selected measurement function.
Frequently Asked Questions
Q: How many transducer inputs does the 3500/42 125672-02 support?
A: The supplied specification identifies 1 to 4 proximity transducer inputs for the four-channel monitor.
Q: What is the specified power consumption?
A: The module consumes 7.7 W typical according to the supplied technical data.
Q: What are the specified output electrical characteristics?
A: The supplied data specifies 550 Ohm output impedance and 0 to +12 VDC voltage compliance across the load.
Field Installation Guidelines
Install the 3500/42 module in the designated 3500 rack position and verify mechanical engagement before energizing the system.
Route transducer wiring separately from high-current power conductors and other sources of electromagnetic interference. Maintain consistent cable shielding practices throughout the signal path.
For eddy-current probe installations, verify probe polarity, signal continuity, and gap voltage before placing the monitoring channel into service. A nominal -10 VDC gap target is commonly associated with Bently Nevada eddy-current probe systems, but the applicable value must follow the specific transducer and system configuration.
Confirm that the configured channel type matches the connected transducer before enabling alarm or monitoring functions. Finally, verify the signal response at the rack level before returning the protected machine to normal operation.
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