The Bently Nevada 3500/42M (1034549-21) is a Proximitor Seismic Monitor I/O Module within the highly regarded Bently Nevada 3500 Series Machinery Protection System. This module is a critical component for monitoring the health of rotating machinery by accepting inputs from both proximity and seismic transducers.

Product Description

The Bently Nevada 3500/42M is a four-channel monitor that plays a dual role in machinery protection and condition monitoring. It's designed to accept input signals from:

• Proximity transducers: These non-contacting probes measure the relative vibration or position of a rotating shaft.
• Seismic transducers: These (like accelerometers or velocity transducers) measure absolute vibration of the machine casing or structure.

The module conditions these raw transducer signals to provide various vibration and position measurements. These conditioned signals are then continuously compared against user-programmable alarm setpoints (Alert and Danger levels). If a parameter exceeds its setpoint, the module can trigger alarms and initiate relay logic within the 3500 system to protect the machinery, potentially by initiating a shutdown.

The "M" in 3500/42M indicates that it's a newer, enhanced version compared to older 3500/42 models, often offering improved capabilities or compliance. The specific part number 1034549-21 likely refers to a particular variant or configuration of the 3500/42M, possibly related to internal termination options or specific certifications.

Product Specifications

• Model: Bently Nevada 3500/42M Proximitor Seismic Monitor
• Part Number (I/O Module): 1034549-21 (This typically refers to the I/O module or a specific configuration for the main monitor card).
• Channels: 4-channel monitor (inputs are programmed in pairs).
• Input Signals: Accepts inputs from 1 to 4 proximity, velocity, or acceleration transducer signals.
• Input Impedance: Typically 10 kΩ for proximitor and acceleration inputs.
• Input Voltage Range: -10 Vdc to +10 Vdc (for signal processing).
• Transducer Power Supply: Provides -24 Vdc for transducers.
• Measured Parameters (User-Programmable):
• Radial Vibration
• Thrust Position
• Differential Expansion
• Eccentricity
• REBAM (Rolling Element Bearing Analysis Method)
• Acceleration
• Velocity
• Shaft Absolute
• Circular Acceptance Region
• Alarms: User-programmable Alert and Danger setpoints for each active static value.
• Outputs: Often provides individual 4-20 mA proportional outputs for each channel (depending on the I/O module type).
• Power Consumption: Typically 7.7 watts.
• Resolution: 0.3662A per bit (specific to internal processing).
• Compliance: Designed to meet API 670 standards for machinery protection systems.
• Environmental: Robust design for industrial environments, including wide temperature range and humidity resistance (e.g., 95% non-condensing).

Product Application Cases

The Bently Nevada 3500/42M is a cornerstone in machinery protection and condition monitoring for critical rotating equipment across various heavy industries.

• Power Generation: Essential for protecting steam turbines, gas turbines, hydro turbines, and generators. It monitors shaft vibration, bearing health, and axial position to prevent catastrophic failures, ensure grid stability, and optimize power output.
• Oil and Gas Industry: Widely used on compressors (centrifugal, reciprocating), pumps, and large fans in refineries, pipelines, and offshore platforms. It detects issues like unbalance, misalignment, bearing wear, and surge conditions to ensure safe and continuous hydrocarbon processing and transportation.
• Petrochemical and Chemical Processing: Safeguards critical rotating machinery like reactors, mixers, and various types of pumps and compressors. Reliable monitoring helps prevent unscheduled shutdowns and maintain product quality and safety in continuous chemical processes.
• Pulp and Paper Industry: Monitors large fan motors, refiners, and dryers to ensure continuous operation and prevent costly damage, which is vital for maintaining production in paper mills.
• Other Heavy Industries: Applied wherever large, high-speed, or critical rotating assets are in use, such as in mining (large conveyors, crushers), cement production (kilns, mills), and steel manufacturing (rolling mills, blowers), providing continuous insight into machine health and protection against costly failures.

Click to download the relevant instruction manual

350042.pdf