Bently Nevada 140734-01 Proximitor Monitor

Module Overview

The Bently Nevada 140734-01 proximitor monitor provides continuous shaft displacement measurement for rotating machinery protection. This 3500 series module interfaces directly with eddy current proximity probes. It converts gap voltage into engineering units for position monitoring. Maintenance engineers rely on this module for shaft position and vibration analysis.

Input Channel Configuration

The Bently Nevada 140734-01 features 2 independent proximity probe input channels. Each channel supplies regulated -24 V DC excitation for eddy current probes. The module accepts signals from 5 mm and 8 mm probe systems. Separate conditioning circuitry exists for each input channel. This redundancy ensures measurement reliability in critical applications.

Measurement Range and Sensitivity

The module measures shaft displacement over a 0 to 2 millimeter range. It achieves a resolution of 0.002 millimeters for precise position tracking. The input sensitivity adjusts from 2 to 10 millivolts per micrometer. Each channel includes programmable scaling for direct engineering units. This flexibility supports various probe calibration constants.

Output Signaling and Alarm Capabilities

The Bently Nevada 140734-01 provides two 4-20 mA analog outputs for system integration. It includes 2 alarm relays for position trip and danger setpoints. Each channel offers independently adjustable alert and danger thresholds. The module also supplies buffered probe signals for diagnostic use. These outputs enable comprehensive proximity monitoring strategies.

Signal Processing and Filtering

The module incorporates adjustable band-pass filtering for noise rejection. Low-pass filters range from 0.5 to 10 hertz for position measurements. A high-pass filter removes DC drift from signal conditioning. The module provides averaging for stable gap readings. This processing ensures accurate proximity measurements.

Communication and System Integration

The Bently Nevada 140734-01 interfaces through the 3500 rack backplane. It exchanges data with the system controller for alarm management. The module supports 3500 configuration software for parameter setting. It provides Modbus communication for external monitoring. This integration fits seamlessly into machinery protection systems.

Physical Dimensions and Installation

The module measures 65 millimeters in width, 150 millimeters in height, and 120 millimeters in depth. The unit weighs 0.5 kilograms for straightforward insertion. It plugs directly into any 3500 rack slot. The module requires no additional mounting hardware. This design simplifies field replacement and maintenance.

Power Consumption and Heat Dissipation

The Bently Nevada 140734-01 draws 130 milliamperes from the backplane supply. It dissipates approximately 4.5 watts during typical operation. The aluminum enclosure aids natural convection cooling. This low power design suits dense rack configurations. The module operates reliably without forced airflow.

Diagnostic and Status Indication

Front-panel LEDs display power, communication, and channel status clearly. A green OK LED confirms normal module operation and configuration. Each channel has dedicated alarm and danger indicator LEDs. The module sends diagnostic codes to the system controller. These indicators enable quick identification of measurement problems.

Environmental Specifications

The module operates from -20°C to +65°C ambient temperature. It withstands 10% to 95% non-condensing humidity conditions. The unit meets ISA S71.04 environmental standards for industrial use. The conformal-coated PCB resists moisture and contaminants. The robust design handles industrial vibration.

Technical Specifications Table