Bently 990-04-50-01-00 Vibration Transmitter - Image 1

Bently 990-04-50-01-00 Vibration Transmitter - Image 2

Bently 990-04-50-01-00 Vibration Transmitter

Product Overview

The Bently 990-04-50-01-00 is a vibration transmitter designed primarily for monitoring the vibration of rotating machinery such as centrifugal air compressors, small pumps, motors, and fans. It converts vibration signals into proportional 4-20 mA current signals, which can be directly input into mechanical control systems for real-time monitoring and protection.

Technical Specifications

Input Signal: Accepts input from a single non-contact 3300 NSV proximity probe and its matching extension cable.

Category: Bently

Description

Output Signal: Provides a two-wire 4-20 mA DC current signal proportional to the vibration amplitude.
Power Supply: Requires a +12 to +35 VDC input at the transmitter terminals.
Accuracy: ±1.5% of the specified full-scale range.
Linear Range: 0.5 to 1.75 mm.
Sensitivity: 7.87 mV/μm (200 mV/mil).
System Length Options: 5 meters (16.4 feet) or 7 meters (23 feet).
Mounting Options: DIN rail clip or spacer mounting screws.
Hazardous Area Certifications: CSA/NRTL/C, ATEX (optional).

Functional Characteristics

Integrated Proximitor Sensor: Eliminates the need for external devices, reducing system complexity and cost.
Dynamic Signal Output: Non-isolated “PROX OUT” and “COM” terminals, along with a coaxial connector, provide dynamic vibration and gap voltage signal outputs for diagnostic purposes.
Zero and Span Adjustments: Zero and span potentiometers support loop adjustments without mutual interference, allowing for easy calibration in the field.
Function Generator Input: Enables quick verification of loop signal output by using a function generator as input to the test input pins.
Power-Up Suppression Circuit: Eliminates signal errors caused by line voltage transients, ensuring stable operation during power-up.
Abnormal/Signal Failure Circuit: Prevents high output or false alarms due to proximity probe failure or loose connections, enhancing system reliability.
Robust Design: Sealed structure suitable for high-humidity environments (up to 100% condensation), ensuring long-term stability and durability.
Compatibility: Compatible with 3300 NSV proximity probes, allowing installation in the smallest gaps typical of centrifugal air compressors.

Application Scenarios

The Bently 990-04-50-01-00 vibration transmitter is widely used in various industrial sectors for monitoring the vibration of rotating machinery, including:

Centrifugal Air Compressors: Monitors vibration levels to prevent mechanical failures and ensure efficient operation.
Small Pumps and Motors: Provides real-time vibration data for predictive maintenance and fault diagnosis.
Fans and Blowers: Detects abnormal vibration patterns to avoid unexpected downtime and costly repairs.
Other Rotating Equipment: Suitable for any application where vibration monitoring is critical for mechanical protection and process control.

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