Bently Nevada 3500/42 Monitor Module | 4-Channel Proximitor

Description

Product Overview

This is the Bently Nevada 3500/42 module (Part 125672-02). It is a dual-purpose monitor for machinery protection. It works with proximity and seismic sensors. This module checks vibration, position, and movement. Connect up to four sensors to one unit. It is a key part of the reliable 3500 monitoring system.

Main Features & Benefits

• Four Input Channels: Monitors up to 4 sensors on one module.
• Very Accurate: Provides readings within ±0.25% error.
• Smart Signal Filters: Includes special filters for clear vibration data.
• Wide Sensitivity Range: Adjustable for different measurements and units.
• Multiple Outputs: Gives buffered signals and industry-standard 4-20mA output.
• Easy Status Check: Front LEDs show power, communication, and bypass mode.
• Built-in Power Supply: Provides -24VDC to power connected proximity probes.

Full Technical Specifications

Product Identification

• Brand: Bently Nevada
• Series: 3500 Monitoring System
• Model Number: 3500/42
• Part Number: 125672-02
• Function: Proximitor and Seismic Vibration Monitor

Electrical Input Details

• Number of Inputs: 4 configurable channels.
• Input Resistance: 10 kΩ standard; 50/150 kΩ for TMR systems.
• Module Power Use: 7.7 watts from the rack.
• Probe Power Output: -24 VDC to drive connected sensors.

Measurement Ranges & Sensitivity

• Vibration (Radial/Thrust): 100 mV/mil or 200 mV/mil selectable.
• Differential Expansion: 10 mV/mil or 20 mV/mil selectable.
• Acceleration: 100 mV/g standard sensitivity.
• Velocity: Multiple ranges: 100, 145, or 500 mV/(in/s) peak.
• Frequency Range: From 0.09 Hz up to 4000 Hz depending on filter.

Output Specifications

• Buffered Signal Output: 550 Ω impedance, short-circuit protected.
• Record Output: 4 to 20 mA linear signal.
• Output Accuracy: ±1% of full scale maximum.
• Update Speed: New reading every 100 ms.
• Load Resistance: 0 to 600 Ω for current output.

Filter Specifications

• Vibration High-Pass Filter: Programmable for 1-600 Hz or 4-4000 Hz.
• Gap (Low-Pass) Filter: -3 dB at 0.09 Hz.
• Notch (Not 1X) Filter: Blocks vibration at 1X running speed.
• Vector (1X & 2X) Filter: Measures precise amplitude and phase.
• Position Filters: -3 dB at 1.2 Hz (Direct) and 0.41 Hz (Gap).

Environmental & Physical

• Operating Temperature: 0°C to +65°C.
• Storage Temperature: -40°C to +85°C.
• Humidity: 5% to 95% (non-condensing).
• Form Factor: Standard full-height 3500 series module.

Quality Assurance & Delivery

All products come with a 12-month quality warranty. We ship worldwide using express carriers: FedEx, UPS, and DHL. You will get an email with your tracking number.

Frequently Asked Questions

General Use

What sensors can I connect to the 3500/42 module?

You can connect proximity probes for shaft vibration or position. You can also connect seismic transducers for casing vibration. The module works with both types.

What is the purpose of the vector filter?

The vector filter isolates the vibration at exactly 1X or 2X running speed. This gives very accurate amplitude and phase data for balancing machinery.

Setup & Troubleshooting

How do I set the correct sensitivity (mV/mil)?

You must match the setting to your probe and cable. Check the nameplate on your transducer kit. The most common setting is 200 mV/mil. Set it in the configuration software.

The OK LED is off. What should I do first?

First, check that the module is fully plugged into the rack. Second, verify the rack has power. The OK LED should light when the module is powered and working correctly.

Buying Advice

I need to monitor a compressor with multiple vibration points. Is one module enough?

The 3500/42 has four channels. If you need to monitor four or fewer points (like two radial vibrations, one thrust, one casing vibe), one module is perfect. For more points, you will need additional modules.

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