BENTLY NEVADA VIBRATION SENSOR PDF

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The XL Proximitor® Sensor incorporates numerous improvements over previous . to any target other than a Bently Nevada AISI steel target. Our proximity sensors detect and monitor conditions to protect your critical machinery. Our current Bently Nevada proximitor systems seostinicousma.cf KB. small target applications, such as measuring radial vibration on shafts smaller range than the Bently Nevada XL-series 5 and 8 mm Transducer System.


Bently Nevada Vibration Sensor Pdf

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Bently Nevada* Asset Condition Monitoring. XL 8mm The XL 8 mm Proximity Transducer System consists of: .. for radial vibration measurements. How-to do the Bently Nevada Vibration Probes Functional Testing and carry out the gap voltage adjustment for vibration probes. Vibration Monitors. Product Datasheet. Bently Nevada* Asset Condition Monitoring range of machine trains orindividualcasings where the sensor.

Previous to the introduction of the so-called "Bently probe," this shaft motion had to be indirectly inferred by measuring the vibration of the machine's casing. While machinery casing measurements can be valuable under certain conditions, machines that employ fluid bearings generally have damping and stiffness characteristics that do not adequately transmit shaft vibration to the machine's casing.

Consequently, direct observation of the machine's shaft rotor was recognized as a more accurate method of assessing condition on such machines. The eddy-current proximity probes pioneered by Bently addressed this need, and quickly became the preferred method of assessing vibration and overall mechanical condition on large turbomachinery employing fluid bearings.

Such machines and bearing types account for the vast majority of compressors, turbines, pumps, electric motors, generators, and other rotating equipment exceeding 1, HP, and can be found in abundance in most industrial plants. As a result, the primary focus of the company shifted from laboratory measurements to industrial measurements on rotating machinery.

Initially, the company sold only the sensors. However, there was a demand for monitoring instruments that could be permanently connected to the sensors installed on the machine, providing a continuous display of the vibration amplitudes and providing alarms whenever the vibration levels exceeded a user-configured warning level.

Bently Nevada began manufacturing monitoring systems as a result, and as user confidence grew in the reliability of such systems, customers began wiring the vibration alarms from these systems into the machine's controls to automatically shut down the machine in event of high vibration.

Thus, Bently Nevada's instrumentation became machinery protection systems, not just monitoring systems. The company continued to expand, making diagnostic instruments such as spectrum analyzers , tunable filters, and other signal conditioning and recording apparatus, in addition to its sensors and monitors. As time went by, it also became apparent that customers were in need of expertise to help interpret their vibration measurements.

In response to this, the company expanded its service organization in the s beyond instrument installation and repair to include a team of machinery diagnostic engineers, skilled in collecting and interpreting vibration signals to help customers identify and correct machinery malfunctions. By , Bently Nevada Corporation had more than 10, active products in its catalog and more than offices in 42 countries.

Its objective was to conduct rotordynamic research, furthering the knowledge of rotating machinery behavior, modeling techniques, and malfunction diagnostic methodologies. Its mission was considered complementary to Bently Nevada, with BRDRC focused on understanding how machinery behaved, and Bently Nevada focused on understanding and building instrumentation to measure machinery behavior.

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BRDRC also introduced several new data presentation formats, such as so-called "full" spectrum plots and "acceptance region" trend plots. Certain applications and measurements are known to Capacitance values for the field wiring provided by GE generate high-frequency content and are particularly for use with Bently Nevada transducers are shown in dependent upon field wiring that preserves the full Table 1.

Some common transducers applications and their dependence upon high-frequency Part Number Description Capacitance signal content are noted below. Table cating compressors. Each Nevada vibration transducers along with notes regarding application must be evaluated on its own merits by cable lengths. Obviously, as long as the field wiring considering the construction of the machine, the fre- provides a frequency response as good or better than the quencies it is likely to generate under normal operating transducer itself, there will be no degradation of high-fre- conditions blade pass, gear mesh, ball pass, etc.

However, the frequencies it is likely to generate under malfunction the total capacitance may exceed the allowable limits for conditions cavitation, structural resonances, rough load hazardous area applications. Thus, when applicable, the zone, etc.

Table 2 — Field wiring and signal quality considerations for typical Bently Nevada transducers. XL Radiation Resistant 15 ft. Velomitors Varies depending on Extended field wire lengths can attenuate relevant model. See pertinent high-frequency content and affect measurement integrity, transducer datasheet. Accelerometers Varies depending on Extended field wire lengths can attenuate relevant high- model.

134624360 Bently Nevada Vibration

See pertinent frequency content and affect measurement integrity. The apparatus is incapable of releasing sufficient elec- Goal trical or thermal energy under normal and abnormal Determine whether the transducer installation of operating conditions to cause ignition of a specific example 1 would be acceptable for a speed-indication flammable atmosphere. As can be seen, I. Consequently, A proximity transducer observing a tooth wheel designers will find that the maximum capacitance turning at rpm will generated a square-wave allowed for I.

Bently Nevada 3300 XL Series Proximitor System

At this frequency Hz , even the fundamental sive capacitive energy or excessive inductive energy, 1X component of the square wave will be attenuated and uses the more restrictive constraint. Invariably, as by more than 4 dB as noted in Figure 1. The user would noted, capacitance turns out to be the limiting factor either need to shorten the field wiring length or choose for our applications.

Consequently, the discussion here field wiring with a lower capacitance-per-meter rating.

However, be aware Hazardous Area Considerations that with other electrical or electronic apparatus you encounter, inductance may be the limiting factor. The Another extremely important issue with extended astute designer will know when an installation will need length field wiring is the need to remain compliant with to be concerned with capacitive constraints instead of hazardous area classifications when applicable.

Bently Nevada Vibration Probes Functional Testing

Today, inductive constraints, and vice-versa. The ers. Although each uses different principles of operation, principle behind such designs is to limit the amount of the idea of an energy-limiting circuit is the same.

When available energy such that a flammable atmosphere external barriers are used, a small voltage drop occurs cannot be ignited under the appropriate conditions.

Bently Nevada monitoring systems designed for use with external bar- Nonincendive N.Its objective was to conduct rotordynamic research, furthering the knowledge of rotating machinery behavior, modeling techniques, and malfunction diagnostic methodologies. Here, however, we As pointed out in example 3, although the length of are given the length and need to find the capacitance field wiring used here will allow the system to remain per unit length CUL.

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The origin of the foot limit Thus, along with our recommendation for 18 AWG wire came a recommendation to limit the length to For many years, the field wiring for Bently Nevada trans- no more than feet m in non-hazardous ducers has been recommended as 18 AWG.

In the company's early years, its non-contacting displacement sensors were used primarily for laboratory rather than industrial measurements.

Obviously, as long as the field wiring considering the construction of the machine, the fre- provides a frequency response as good or better than the quencies it is likely to generate under normal operating transducer itself, there will be no degradation of high-fre- conditions blade pass, gear mesh, ball pass, etc.

Invariably, as by more than 4 dB as noted in Figure 1. The short answer is that When Don Bently worked on making solid-state versions of the eddy-current measurement system it was actually originally designed in the s by GE engineers using vacuum tubes , he had a choice between using N-P-N transistors or P-N-P transistors.

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