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.

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.

In order to test a pressure transducer, you need to connect the transmitter to the multimeter and use the suitable excitation voltage to excite the transmitter. At zero load, measure the transmitter's voltage output. Record the voltage and compare it to the manufacturer's datasheet's no-load voltage specification.

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.

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

RMS (Root Mean Square) frequency of a spectrum is a single number that represents the overall level of energy across a frequency range. Basics of RMS (Root Mean Square) frequency in Vibration Analysis: It is challenging part to collect vibration data in vibration management and analysis of data collected.

An acceptable vibration level would be below 0.16 in/sec (pk) or 2.8 mm/sec (rms). Restricted Operation – the same motor/pump operating a vibration levels between 0.16-0.25 in/sec (pk) or 2.8-4.5 mm/sec (rms) should be considered to have a problem causing excessive vibration, such as unbalance or misalignment.

What is the principle of bently Nevada 3500? ›

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.

A vibrating wire consists of a piece of thin metallic wire held at tension between two fixed points. Once activated, the wire naturally vibrates at it's resonate frequency. This frequency is then measured. As tension and force on the wire changes, the vibration frequency either increase or decreases.

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.