GE / Bently Nevada 990 Vibration Transmitter 990-05-XX-03-05 (2024)

FAQs

How does the bently Nevada vibration sensor work? ›

They work on the eddy current principle, where the sensor coil impedance changes as the gap between the probe and the rotating equipment changes due to vibration.

Use a vibration shaker or exciter to generate controlled vibrations. Apply different frequencies and amplitudes to the sensor and measure the corresponding output signals. This test helps determine the sensor's frequency response and linearity.

The vibration transmitter's 4-20 mA output is proportional to overall acceleration vibration. The sensor also outputs the dynamic acceleration signal.

How do Vibration Sensors Work? The vibration sensor consists of a piezoelectric crystal that has a seismic mass attached to it. When the equipment/machine under study experiences vibrations, the crystal is subjected to stress, and an electric signal is generated, which is then converted to valuable data.

Probe tips should be made of steel and be no longer than six inches. Once installation is complete, it is recommended that the vibration sensor be tested for proper operation. Measure the DC bias output voltage (BOV) by powering the sensor and connecting a voltmeter across the sensor's signal and common leads.

The gE value, also known as the basic rating life or rating life, refers to the expected operational life of a bearing under a certain load based on static and dynamic loading conditions.

Vibration sensors are used for monitoring systems, whereas vibration transmitters are used for control system inputs.

Vibration can be expressed in metric units (m/s²) or units of gravitational constant g, where 1 g = 9.81 m/s². An object can vibrate in two ways: free vibration and forced vibration. Free vibration occurs when an object or structure is displaced or impacted and then allowed to oscillate naturally.

3500/40M Proximitor† Monitor accepts input from Bently Nevada 3300XL series of Proximitor and seismic transducers conditions the signal to provide various vibration and position measurements, and compares the conditioned signals with user-programmable setpoints that can drive alarms and relay logic in the 3500 relay ...

This vibration sensor works based on an unstable mechanical configuration that forms part of the electrical circuit. When movement or vibration occurs, the unstable portion of the circuit moves and breaks the current flow, which produces an alarm.

How does a vibrating wire sensor work? ›

A vibrating-wire sensor operates on the principle that a tensioned wire, when plucked, will vibrate at its resonant frequency. Physical changes to the sensor cause a change in the tension of the wire. An electromagnetic "plucking and pickup" coil strums the wire across a specified frequency spectrum.

This type of monitoring uses transmitters that provide a 4 to 20 milliamp (mA) signal connected directly to the control system to monitor the vibration data. This monitoring concept incorporates alarms and shutdown capabilities that help prevent machine failures and identify abnormal trends.