Overview
Configured for machinery vibration and position monitoring in the Bently Nevada 3500 Machinery Protection System, the Bently Nevada 3500/40-03-01 (3500/40M Proximitor Monitor Module) accepts proximity transducer signals, conditions measurement channels, and compares measured values with programmable alarm setpoints. The -03 configuration uses a Proximitor I/O module with internal barriers and internal terminations, while -01 specifies the cNRTLus hazardous-area approval option. (Baker Hughes DAM)
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/40-03-01 |
| Base Model | 3500/40M Proximitor Monitor |
| Brand | Bently Nevada |
| Product Type | Proximitor Monitor Module |
| System | 3500 Machinery Protection System |
| Channel Configuration | 4 channels; channels are configured in pairs |
| Input | 1 to 4 Bently Nevada proximity transducer signals |
| Input Impedance | 10 kOhm, standard I/O |
| Power Consumption | 7.7 W typical |
| Transducer Power Supply | -24 VDC |
| Buffered Output | One coaxial connector per channel; short-circuit protected |
| Buffered Output Impedance | 550 Ohm |
| Radial Vibration Sensitivity | 3.94 mV/um or 7.87 mV/um |
| Thrust Sensitivity | 3.94 mV/um or 7.87 mV/um |
| Eccentricity Sensitivity | 3.94 mV/um or 7.87 mV/um |
| Differential Expansion Sensitivity | 0.394 mV/um or 0.787 mV/um |
| REBAM Sensitivity | 40 mV/um or 80 mV/um |
| Radial Vibration Direct Filter | 4 Hz to 4000 Hz or 1 Hz to 600 Hz, programmable |
| Radial Vibration Gap Filter | -3 dB at 0.09 Hz |
| Alarm Setpoint Range | 0 to 100% of full-scale |
| Alarm Setpoint Accuracy | Within 0.13% of desired value |
| Operating Temperature | 0 deg C to +65 deg C with internal barrier I/O module; -30 deg C to +65 deg C with non-barrier I/O configurations |
| Storage Temperature | -40 deg C to +85 deg C |
| Humidity | 95%, noncondensing |
| Monitor Dimensions | 241.3 mm H x 24.4 mm W x 241.8 mm D |
| Monitor Weight | 0.91 kg |
| Barrier I/O Module Dimensions | 241.3 mm H x 24.4 mm W x 163.1 mm D |
| Barrier I/O Module Weight | 0.46 kg |
| Rack Space | 1 full-height front slot for monitor; 1 full-height rear slot for I/O module |
| I/O Module Configuration | Internal barriers and internal terminations |
| Hazardous Area Approval Option | cNRTLus, Class I, Division 2 |
| Origin | USA |
The core electrical and physical specifications above follow the current Bently Nevada 3500/40M datasheet. (Baker Hughes DAM)
Eddy-Current Probe Scaling and Rotor Dynamics
The 3500/40M processes signals from Bently Nevada proximity transducers and converts the conditioned inputs into machine-monitoring static values. Depending on channel configuration, the monitor provides radial vibration, thrust position, differential expansion, eccentricity, or REBAM measurements. (Baker Hughes DAM)
For radial vibration, the monitor supports 100 mV/mil and 200 mV/mil sensitivity settings. It also provides direct, gap, 1X amplitude and phase, 2X amplitude and phase, Not 1X, and Smax measurement values. The 1X and 2X vector functions support machine speeds from 60 cpm to 60,000 cpm. (Baker Hughes DAM)
The monitor uses programmable filtering to process rotor-dynamic signals. Its radial vibration section includes direct, gap, Not 1X, constant-Q notch, Smax, and 1X/2X vector filtering. Therefore, the selected channel configuration determines which vibration parameters and filters become active. (Baker Hughes DAM)
Frequently Asked Questions
Q: Is the 3500/40-03-01 a four-channel monitor?
A: Yes. The 3500/40M provides four monitoring channels, and the channels operate in pairs. Channels 1 and 2 form one functional pair, while channels 3 and 4 form another. (Baker Hughes DAM)
Q: What does the “-03” configuration specify?
A: The -03 I/O option specifies a Proximitor I/O module with internal barriers and internal terminations. The “-01” suffix specifies the cNRTLus hazardous-area approval option. (Baker Hughes DAM)
Q: Does the internal-barrier configuration affect operating temperature?
A: Yes. With the internal-barrier I/O module and internal termination, the specified operating range is 0 deg C to +65 deg C. (Baker Hughes DAM)
Field Installation Guidelines
Install the monitor in the designated full-height front slot of a compatible 3500 rack and install the associated I/O module in the corresponding rear slot. (Baker Hughes DAM)
Verify the I/O configuration before wiring. The -03 option uses internal barriers and internal terminations, so the field wiring arrangement differs from external-termination configurations.
Route proximity transducer wiring separately from high-current power conductors and switching circuits where practical. Maintain appropriate cable shielding and grounding practices specified by the system installation documentation.
Before commissioning, verify the proximity probe type, channel assignment, signal polarity, transducer scaling, and configured measurement function. For eddy-current systems, confirm the probe and driver operating point before enabling machinery alarm logic.
Configure channel functions and alarm parameters through the applicable 3500 Rack Configuration Software. The manufacturer specifies minimum software revisions for the 3500/40M, including 3500/01 Version 2.50, 3500/02 Version 2.20, and 3500/03 Version 1.21. (Baker Hughes DAM)
For hazardous-area installations, use the applicable Bently Nevada installation drawings and approval documentation. The internal-barrier configuration has specific installation requirements associated with its hazardous-area approval. (Baker Hughes DAM)
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