3500/40M Proximitor® Monitor

Overview

The Bently Nevada 3500/40M is a four-channel Proximitor monitor for the 3500 series machinery protection rack, processing signals from Bently Nevada proximity transducers to continuously track radial vibration, eccentricity, thrust position, differential expansion, and bearing condition (REBAM) on rotating machinery. Its ability to configure channel pairs for multiple measurement types from one module simplifies rack design compared with dedicating separate single-purpose monitors to each parameter.

As a core measurement module in the widely deployed Bently Nevada 3500 platform, the 3500/40M is engineered for continuous, safety-critical protection of turbines, compressors, and other high-value rotating equipment. Seven Star LLC supplies the Bently Nevada 3500/40M Proximitor monitor as an authorized Bently Nevada/Baker Hughes instrumentation partner to power generation, oil and gas, and process facilities across Oman and the GCC.

Operating Principle

The 3500/40M accepts signals from up to four Bently Nevada proximity transducers, processing them through programmable signal conditioning to derive the configured measurement type for each channel pair. Each channel provides a buffered transducer output through its own coaxial connector, with 550Ω output impedance and short-circuit protection, letting the raw or conditioned transducer signal be tapped for external data acquisition or portable diagnostic equipment without disturbing the protection function.

Engineering Design of the Bently Nevada 3500/40M

The monitor supports independently configurable alert and danger alarm thresholds across its four channels, adjustable from 0 to 100% of full-scale with accuracy within 0.13% of the desired setpoint. Programmable time delays from 0.1 to 60 seconds (measurement-type dependent) prevent nuisance trips from transient spikes while still responding quickly to genuine fault conditions. Three front-panel LEDs (OK, TX/RX communication, Bypass) give at-a-glance module status, and the monitor supports channel-pair configuration for radial vibration, eccentricity, thrust position, differential expansion, and REBAM bearing-condition measurement.

Key Features

• Four-channel Proximitor signal monitoring
• Configurable for radial vibration, eccentricity, thrust, differential expansion, REBAM
• Alarm setpoints adjustable 0–100% full-scale, ±0.13% accuracy
• Programmable alarm time delays, 0.1–60 seconds
• Buffered coaxial transducer outputs per channel, 550Ω impedance
• Short-circuit protected outputs
• Three front-panel status LEDs (OK, TX/RX, Bypass)
• Compatible with the full Bently Nevada 3500 rack platform

Industrial Applications

The 3500/40M is used for continuous vibration, position, and bearing-condition monitoring on turbines, compressors, and generators in power generation, oil and gas, and petrochemical facilities across Muscat, Sohar, and Salalah, where machinery protection systems must reliably detect developing mechanical problems before they cause catastrophic failure or unplanned shutdown.

Across the GCC’s power and process industries, the 3500/40M’s configurable channel pairs let one module cover multiple measurement types on a single machine train, while its buffered outputs support portable vibration analyzers and condition-monitoring software tapping the same transducer signals used for the protection function, without adding separate instrumentation.

Technical Specifications

Request a Quote for 3500/40M Proximitor® Monitor

Contact Seven Star LLC for pricing and availability on the Bently Nevada 3500/40M Proximitor monitor across Oman and the GCC. Our team can help configure the correct channel-pair measurement setup for your machinery protection rack.