3500/42-02-00 Bently Nevada Proximitor Seismic Monitor

3500/42-02-00 Proximitor Seismic Monitor Installation Guide

Product Introduction

The Bently Nevada 3500/42-02-00 belongs to the reliable 3500 Series. This Proximitor Seismic Monitor processes signals from one to four transducers. Specifically, it supports proximity probes, accelerometers, and velocity sensors. Therefore, it suits many rotating machinery monitoring tasks.

The I/O Module Type 02 allows multiple transducer types. For instance, Seismoprobe and Velomitor sensors are supported. However, Bently Nevada does not recommend these two types. The Hazardous Area Approval Option is 00 (none). This module consumes only 7.7 watts typically. Moreover, it offers front panel LEDs for status checking. These LEDs include OK, TX/RX, and Bypass indicators.

Core Value

This 3500/42-02-00 module delivers high accuracy. It provides ±0.33% of full-scale typical error. Besides, the module includes multiple filtering options. For example, direct and gap filters are user-programmable. Additionally, the monitor offers 1X and 2X vector filters. These features help detect unbalance and misalignment early.

Furthermore, the 3500/42-02-00 supports many measurement types. Radial vibration, thrust position, and eccentricity are standard. Also, it handles differential expansion and acceleration. Moreover, velocity measurements are possible. Therefore, one module can replace several single-purpose devices. This reduces rack space and costs. Meanwhile, each channel has a buffered output on the front panel. Each coaxial connector is short-circuit protected.

Technical Insights

The input impedance stands at 10 kΩ for Proximitor and acceleration inputs. Sensitivity settings vary by measurement type. For radial vibration, choose 3.94 mV/µm or 7.87 mV/µm. For differential expansion, use 0.394 mV/µm or 0.787 mV/µm. Acceleration inputs accept 10 mV per (m/s²). Velocity inputs accept 20 mV per (mm/s) pk. Additionally, recorder outputs provide +4 to +20 mA signals. These values are proportional to the monitor full-scale.

Frequency response depends on the selected filter. The direct filter offers a user-programmable range. For radial vibration, this range is from 4 Hz to 4000 Hz or 1 Hz to 600 Hz. The Not 1X filter has a minimum rejection of -34.9 dB. Meanwhile, the 1X and 2X vector filters achieve -57.7 dB rejection. Therefore, these filters suppress unwanted noise effectively. The update rate for recorder outputs is approximately 100 ms. Resolution reaches 0.3662 µA per bit.

The 3500/42-02-00 also provides shaft absolute buffered outputs. Output impedance for these signals is 300 Ω. The transducer power supply delivers -24 Vdc. For recorder outputs, voltage compliance ranges 0 to +12 Vdc across a 0 to 600 Ω load. Furthermore, short circuits on recorder outputs do not affect monitor operation.

Installation & Maintenance

Install the 3500/42-02-00 into a 3500 rack. First, power down the rack or ensure safe hot-swap conditions. Then align the module with the guide rails. Slide it in gently until the backplane connectors engage. Tighten the front screws securely. Next, connect each transducer to the front coaxial connectors. Use proper cabling to avoid noise induction. For proximity probes, maintain correct gap voltage.

Additionally, configure the monitor using the 3500 configuration software. Set sensitivity, full-scale range, and filter types for each channel. Verify OK LED illuminates after power-up. The TX/RX LED should blink during normal communication. To bypass the monitor for maintenance, use the Bypass mode. The Bypass LED confirms this mode is active.

Regular maintenance includes checking transducer cables. Inspect for cuts, corrosion, or loose connections. Also, test recorder outputs periodically. Measure +4 to +20 mA signals under known conditions. Besides, clean the front panel with a dry cloth. Do not use solvents. If the OK LED turns off, check configuration and supply voltage. Refer to the manual for detailed troubleshooting.

Buyer’s Guide FAQ

1. Does the 3500/42-02-00 support Velomitor sensors?
Yes, the 3500/42-02-00 supports Velomitor sensors. However, Bently Nevada does not recommend using them with this module.

2. How many channels does this monitor accept?
It accepts from one to four transducer signals. Each channel has an independent input and buffered output.

3. What is the output impedance for buffered transducer outputs?
The output impedance is 550 Ω. Each coaxial connector is short-circuit protected.

4. Can I use the 3500/42-02-00 for shaft absolute vibration?
Yes, it supports shaft absolute radial vibration and velocity measurements. Sensitivity options include 3.94 mV/µm or 7.87 mV/µm.

5. What is the typical power consumption?
The typical power consumption is 7.7 watts. This value assumes normal operating conditions with all channels active.