Bently Nevada 176449-02 3500/42M Proximitor Seismic Monitor

Product Overview

The Bently Nevada 176449-02 serves as a 3500/42M Proximitor Seismic Monitor designed for continuous machinery protection. This module tracks vibration and position parameters from up to four transducers, then compares these values against user-configured alarm setpoints. When parameters exceed set limits, the module triggers appropriate alerts to protect valuable machinery assets.

The 176449-02 is the product number for the 3500/42M monitor module itself, representing the main board assembly. This module fits into standard 3500 series racks and works with various I/O modules depending on specific application requirements. The monitor accepts a wide range of transducer types, making it a versatile choice for different machinery monitoring scenarios.

Input Specifications

The 176449-02 accepts signals from one to four proximity, velocity, or acceleration transducers. Typical power consumption measures 7.7 watts. The standard I/O provides an input impedance of 10 kΩ for both Proximitor and acceleration inputs.

Sensitivity options vary by measurement type. For radial vibration, thrust, and eccentricity measurements, users can select either 3.94 mV/μm or 7.87 mV/μm. Acceleration inputs operate at 10 mV/(m/s²). Velocity inputs offer multiple scaling choices, including 20 mV/(mm/s) pk, 5.8 mV/(mm/s) pk, or 4 mV/(mm/s) pk.

The 3500/42M monitor supports various transducer types including proximity probes, accelerometers, and velocity sensors. This flexibility allows the 176449-02 to adapt to diverse application requirements, from bearing vibration monitoring to shaft position measurements.

Signal Conditioning and Filtering

The 176449-02 offers sophisticated signal conditioning capabilities. For radial vibration measurements, the direct filter is user-programmable with a single-pole -3 dB point ranging from 4 Hz to 4000 Hz. The gap filter provides -3 dB at 0.09 Hz. For thrust and differential expansion, the direct filter delivers -3 dB at 1.2 Hz while the gap filter operates at 0.41 Hz.

Specialized filtering options include the Not 1X filter, which achieves a minimum stopband rejection of -34.9 dB. Additionally, the 1X and 2X vector filters attain a minimum rejection of -57.7 dB. These filters effectively remove unwanted frequency components, ensuring accurate vibration analysis.

Accuracy specifications remain consistent across measurement types. Direct and gap measurements achieve ±0.33% of full-scale typical and ±1% maximum. The Smax measurement maintains ±5% maximum accuracy. For acceleration measurements, 4-pole filter designs serve both high-pass and low-pass applications. The Velocity II filter quality uses 4-pole high-pass and 2-pole low-pass designs.

Outputs and Status Indication

The front panel features three visual status LEDs. The OK LED illuminates when the monitor operates properly. The TX/RX LED indicates communication activity with other modules in the 3500 rack. The Bypass LED signals when the monitor enters Bypass Mode.

Each channel has a coaxial connector on the front panel that serves as a buffered transducer output. These connectors are short-circuit protected and feature an output impedance of 550 Ω. The transducer power supply delivers -24 Vdc.

The 176449-02 provides individual +4 to +20 mA recorder outputs for each channel. These outputs are proportional to the monitor's full-scale range. Short circuits on recorder outputs do not affect monitor operation. The voltage compliance ranges from 0 to +12 Vdc across a load resistance of 0 to 600 Ω. Resolution is rated at 0.3662 µA per bit with ±0.25% error at room temperature and ±0.7% error across the temperature range. The update rate is approximately 100 ms or less.

Shaft Absolute Measurements

The 3500/42M monitor supports shaft absolute measurements through specialized I/O modules. These modules provide one output for each channel group. Each output is short-circuit protected and features an output impedance of 300 Ω.

Shaft absolute measurements include radial vibration, direct, and velocity options. Radial vibration sensitivity can be set to either 3.94 mV/μm or 7.87 mV/μm. Direct measurements offer the same sensitivity choices. Velocity measurements offer multiple scaling options: 20 mV/(mm/s) pk, 5.8 mV/(mm/s) pk, or 4 mV/(mm/s) pk.

Velocity and Acceleration Measurements

For velocity measurements, the 176449-02 achieves ±0.33% of full-scale typical and ±1% maximum accuracy. When using MTL 764(-) Zener external barriers, accuracy ranges from +1% to -3% exclusive of filters. Velomitor sensor accuracy varies by full-scale range: ±3% typical for 0-0.5 range, ±2% typical for 0-1.0 range, and ±1% typical for 0-2.0 range.

The velocity frequency response includes RMS from 10 to 5,500 Hz at -3 dB, and peak or peak-to-peak from 3 to 5,500 Hz at -3 dB. The 1X and 2X vector filters remain valid for machine speeds from 60 to 100,000 cpm for Velocity II measurements.

For acceleration measurements, accuracy stays within ±0.33% of full-scale typical and ±1% maximum, exclusive of filters. The bias filter delivers -3 dB at 0.01 Hz, while the Not OK filter provides -3 dB at 2400 Hz. The 1X and 2X vector filters are valid for machine speeds from 60 cpm to 100,000 cpm.

Environmental and Physical Specifications

The monitor operates at +25 ºC (+77 ºF) unless otherwise noted. This module maintains high accuracy across a wide temperature range, ensuring reliable performance in demanding industrial environments. The robust construction suits installation in 3500 series racks commonly found in power generation, oil and gas, and heavy manufacturing facilities.

The module board measures 241.3 mm in height, 24.4 mm in width, and 241.8 mm in depth. Gross weight is approximately 0.91 kg (2.0 lbs). The module fits standard 3500 series rack slots and is mechanically interchangeable with other modules in the product line.

Installation Guidelines

Installing the Bently Nevada 176449-02 follows a straightforward process. First, power down the 3500 rack before inserting or removing any module. Next, slide the module into the designated slot until it seats fully. Then, secure the module using the retaining screws on the top and bottom.

The 176449-02 works with various I/O modules that provide the specific termination and barrier configurations required for different transducer types. Users must select the appropriate I/O module based on their transducer and hazardous area requirements. Proper configuration in the 3500 rack configuration software ensures measurement accuracy and reliable protection.

The 3500/42M monitor works with various Bently Nevada transducers, including 3300 XL and 7200 series proximity probes, Velomitor sensors, and accelerometers. Users should select the appropriate transducer type during configuration.

Packaging List

The shipment includes the following items:

• 1 x Bently Nevada 176449-02 3500/42M Proximitor Seismic Monitor Module

• 1 x Installation and Configuration Manual

Certificates and warranty documents are not included in the packaging list and are handled separately.

Shipping Method: FedEx, UPS, or DHL

Frequently Asked Questions

What is the Bently Nevada 176449-02?

The 176449-02 is the product number for the 3500/42M Proximitor Seismic Monitor main board. This 4-channel module provides continuous vibration and position monitoring for critical rotating machinery.

What types of transducers work with the 176449-02?

This monitor accepts signals from proximity probes, accelerometers, and velocity sensors. The specific I/O module selected determines the exact transducer compatibility.

What is the power consumption of the 176449-02?

The 176449-02 typically consumes 7.7 watts of power during normal operation.

How do I configure the 176449-02 for my application?

You can configure the module using the 3500 rack configuration software. This software allows you to set transducer types, sensitivities, alarm limits, and other parameters for each channel.

What are the physical dimensions of the 176449-02?

The module measures 241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in) and weighs approximately 0.91 kg (2.0 lbs).