Bently Nevada 3500/42-02-01 Proximitor Seismic Monitor

Bently Nevada 3500/42-02-01 Proximitor Seismic Monitor

Product Introduction

The 3500/42-02-01 from Bently Nevada provides reliable machinery protection monitoring. This Proximitor Seismic Monitor accepts up to four transducer inputs. You can connect proximity, velocity, or acceleration sensors. Additionally, this unit supports external terminations via I/O module type 128240-01. The 3500/42-02-01 works perfectly in hazardous areas with its cNRTLus approval.

Input Signal and Channel Configuration

This monitor accepts one to four transducer signals. Specifically, it handles proximity probes, velocity pickups, and accelerometers. However, note that Seismoprobe Prox/Accel and Velomitor are supported but not recommended. The input impedance measures 10 kΩ for both Proximitor and acceleration inputs. Therefore, you get stable and accurate signal conditioning.

Power Consumption and Operating Status

The 3500/42-02-01 consumes only 7.7 watts under typical operation. Front panel LEDs keep you informed. First, the OK LED lights when the monitor operates properly. Next, the TX/RX LED flashes during rack communication. Finally, the Bypass LED indicates when the monitor enters Bypass Mode. This clear visual feedback simplifies daily checks.

Sensitivity Settings Per Measurement Type

You can configure sensitivity for different measurement types. The 3500/42-02-01 offers flexible scaling options.

Radial Vibration & Thrust & Eccentricity

• 3.94 mV/μm (100 mV/mil) or 7.87 mV/μm (200 mV/mil)

Differential Expansion

• 0.394 mV/μm (10 mV/mil) or 0.787 mV/μm (20 mV/mil)

REBAM

• 40 mV/μm (1000 mV/mil) or 80 mV/μm (2000 mV/mil)

Acceleration & Acceleration2

• 10 mV/(m/s²) (100 mV/g)

Velocity & Velocity2

• 20 mV/(mm/s) pk (500 mV/(in/s) pk) or

• 5.8 mV/(mm/s) pk (145 mV/(in/s) pk) or

• 4 mV/(mm/s) pk (100 mV/(in/s) pk)

Shaft Absolute (Radial Vibration, Direct)

• 3.94 mV/μm (100 mV/mil) or 7.87 mV/μm (200 mV/mil)

Shaft Absolute Velocity

• 20 mV/(mm/s) pk (500 mV/(in/s) pk) or

• 5.8 mV/(mm/s) pk (145 mV/(in/s) pk) or

• 4 mV/(mm/s) pk (100 mV/(in/s) pk)

Buffered Transducer Outputs

Each channel includes a coaxial connector on the front panel. These buffered outputs are short-circuit protected. The output impedance measures 550 Ω. Additionally, the transducer power supply provides -24 Vdc. You can connect external analyzers without interrupting normal monitor operation.

Recorder Outputs and Current Loop

The 3500/42-02-01 provides +4 to +20 mA recorder outputs. These values stay proportional to the monitor full-scale scale. Each channel has its own individual recorder value. Short circuits on recorder outputs will not affect monitor operation. The voltage compliance ranges from 0 to +12 Vdc across a 0 to 600 Ω load. Resolution reaches 0.3662 µA per bit with ±0.25% error at room temperature. The update rate stays at approximately 100 ms or less.

Shaft Absolute Buffered Outputs

Shaft Absolute I/O modules include one output per channel group. Each output is short-circuit protected. The output impedance for Shaft Absolute is 300 Ω. This feature supports advanced shaft relative and absolute measurements.

Installation and Rack Requirements

Installation requires a standard Bently Nevada 3500 rack. The 3500/42-02-01 fits into one full-height front slot. The corresponding I/O module occupies one rear slot. Furthermore, ensure proper grounding before powering up. Always power down the rack when inserting or removing modules.

Packaging and Delivery

Packaging List

• 3500/42-02-01 Proximitor Seismic Monitor Main Module (1 unit)

• I/O Module (128240-01) with external terminations (1 unit)

• Installation quick reference card

Note: No certificates or warranty documents are included in the package.

Shipping Methods
FedEx, UPS, DHL

Frequently Asked Questions

1. Can the 3500/42-02-01 monitor both proximity and velocity sensors at the same time?
Yes. This monitor accepts up to four mixed transducer signals. You can connect proximity probes on channels 1-2 and velocity sensors on channels 3-4.

2. Why are Seismoprobe Prox/Accel and Velomitor not recommended?
While technically supported, these sensors may not provide optimal performance. Bently Nevada recommends using standard Proximitor or acceleration inputs for best results.

3. What happens if I short-circuit a recorder output?
Nothing damaging. The 3500/42-02-01 monitor operation remains unaffected. Short circuits on recorder outputs will not stop the monitoring function.

4. How fast does the recorder output update?
The update rate is approximately 100 ms or less. Therefore, you get near real-time analog signals for external recording devices.

5. Does the 3500/42-02-01 support differential expansion measurements?
Yes. You can set sensitivity to either 0.394 mV/μm or 0.787 mV/μm for differential expansion probes. This makes it suitable for thrust position monitoring.