Thanks for explaining it in a simple and not missing the technical and application of the Proximity probes, a great help to instrument techs and engineers.
Jim, not to be critical, but you have the polarity of your voltmeter backwards. Bently uses a -24VDC power supply and the output of the proximeter is (-) negative. This is critical when understanding the gap voltage is part of diagnosing a machine condition. It is use for radial shaft position (X/Y) and axial position for thrust measurements. Monitoring shaft centerline using DC Gap voltage can tell the analyst alot about shaft position in the bearing. When using a standard proximiter, it is -24VDC and when using the Bently 990 transmitter, it is +24VDC. This is also critical to know because the phase reference on the 990 transmitter is 180 degrees out of phase.
Dear sir. I have two probes with different part number, PN: 86691-08065-0435-25 and PN:86691-09246-0435-25. I only know they are 2.5 m length but i am not sure they can be used interchangeably. Is it possible? What are their differences?
I don't have that manual, so I cannot say for certain. From a performance standpoint it should work. Difference will be in the custom features. Such as mounting options, length of armored jacket, etc..
This procedure verifies accuracy. You must determine the amount of acceptable error based on machine tolerances. Excessive error usually indicates a mismatched or faulty component. The resistance test can help diagnose.
3 роки тому
At 3:13, what is actually the neutral point of the oscillation ? Is it the initial gap voltage when the shaft stops spinning or when there is no vibration ?
The neutral point is the mid point between upper and lower travel during vibration. If the shaft is not vibrating, there is no neutral point because the voltage is not fluctuating. Or are you asking what the expected DC voltage will be during vibration?
3 роки тому
Thank you, I got your point. But what can we do with the DC voltage when the shaft is vibrating, or we just care about the AC voltage and use it to calculate frequency & amplitude of the vibration ?
@ DC voltage is still used in Radial Vibration. Most people track DC voltage and set alarm points to warn if a probe is out of range. It can also used for measuring shaft movement while it is rotating for diagnostic purposes. Bearing wear can cause shaft drift over time, which can be identified with gap voltage while it is running. Pressure dam bearings cause the shaft to ride on an oil wedge. Radial vibration probes can monitor this shaft movement with the gap voltage. This is why it is important to set all probes at the exact same voltage so you can monitor movement across the shaft length.
You cannot adjust the proximitor. This is because there is no scaling taking place inside the proximitor. This function occurs at the monitoring rack. Good question.
Excuse me sir. My name is agus. I have some question related with vibration system. 1. Whats the function for minus DC power supply? 2. Whats correlation between DC power supply and AC power supply which generated by probe?
Answer 1: The polarity doesn't matter unless you are a transistor, which in this case is why the polarity is reversed. For the purpose of understanding how it works, it makes little difference.
Answer2: Think of the AC as DC with a wave. Normal AC changes polarity, this doesn't. You just have to switch a meter to AC to measure the dynamics of the sinewave that is created. It's AC with a voltage bias.
This product was originally invented a long time ago. At that point in time, due to the availability of semiconductors, it was more practical and cost efficient to apply a negative voltage, which provided the proper gate voltage for the more common semiconductor type. It is no longer a thing that people consider during instrument design. The -24volts has been adopted by all the newer iterations of the product line.
Thanks for explaining it in a simple and not missing the technical and application of the Proximity probes, a great help to instrument techs and engineers.
Jim, not to be critical, but you have the polarity of your voltmeter backwards. Bently uses a -24VDC power supply and the output of the proximeter is (-) negative. This is critical when understanding the gap voltage is part of diagnosing a machine condition. It is use for radial shaft position (X/Y) and axial position for thrust measurements. Monitoring shaft centerline using DC Gap voltage can tell the analyst alot about shaft position in the bearing. When using a standard proximiter, it is -24VDC and when using the Bently 990 transmitter, it is +24VDC. This is also critical to know because the phase reference on the 990 transmitter is 180 degrees out of phase.
Vibration monitoring thought to be most complex but you made it simpler.
Thanks
Thank you for the compliment!
Very good explanation, now I have a better understanding of Proximity probes.
Continue upload videos,
It's so informative .thank you
Thank you, I will
Simple to the point explanations, thank you.
very good ,explained clearly thank you sir.
Thank you for the kind words.
Excellent explained.... great job...
Thank you!
out class presentation...God bless you
Thank you friend!
Nice explanation
Thank you!
Thank you for your video. I have a confused question " Can vibration monitoring module supply +24VDC and -24VDC ?"
Are you referring to the proximitor card on the bently nevada monitoring rack?
@@jimdiggins101 Yes, Sir
Great, clear explanation. Excellent.
Thanks!
Awesome instruction.
Thanks
Simple explanation, but hard to find it. Do you know any supplier I can buy proximeters from? I am located in Brazil.
I don't know. Baker Hughes owns Bently Nevada and they have a global presence. I'm sure there is a local representative. I would check their website.
I got great information... Tq brother
I'm glad you liked it, thanks for the feedback.
How does the eddy current generate in the metal? Does the varrying magnatic field has something with it?
You are correct
great video..thanks a lot
Bom dia, muito bom o vídeo obrigado vai me ajudar muito no trabalho!!
Great video! How do you put in and out the override switch? Normally this is via the monitor software?
I'm not familiar with an override. Are you referring to the bypass switch?
@@jimdiggins101 in between i figured out, every slot has a digital input alarm. At our plant we can override with a switch the DI!
@@Jokesxxl you mean, trip multiply??
@@kasumy17 i looked further, i mean a override switch for alarm if you replace a sensor
@@Jokesxxl okay, you mean bypass the alarm, while you replace de sensor during an operation machine??
Dear sir. I have two probes with different part number, PN: 86691-08065-0435-25 and PN:86691-09246-0435-25. I only know they are 2.5 m length but i am not sure they can be used interchangeably. Is it possible? What are their differences?
I don't have that manual, so I cannot say for certain. From a performance standpoint it should work. Difference will be in the custom features. Such as mounting options, length of armored jacket, etc..
if ISF% bigger than the manufacturer's standard, how recalibrate transducer?
This procedure verifies accuracy. You must determine the amount of acceptable error based on machine tolerances. Excessive error usually indicates a mismatched or faulty component. The resistance test can help diagnose.
At 3:13, what is actually the neutral point of the oscillation ? Is it the initial gap voltage when the shaft stops spinning or when there is no vibration ?
The neutral point is the mid point between upper and lower travel during vibration. If the shaft is not vibrating, there is no neutral point because the voltage is not fluctuating. Or are you asking what the expected DC voltage will be during vibration?
Thank you, I got your point. But what can we do with the DC voltage when the shaft is vibrating, or we just care about the AC voltage and use it to calculate frequency & amplitude of the vibration ?
@ DC voltage is still used in Radial Vibration. Most people track DC voltage and set alarm points to warn if a probe is out of range. It can also used for measuring shaft movement while it is rotating for diagnostic purposes. Bearing wear can cause shaft drift over time, which can be identified with gap voltage while it is running. Pressure dam bearings cause the shaft to ride on an oil wedge. Radial vibration probes can monitor this shaft movement with the gap voltage. This is why it is important to set all probes at the exact same voltage so you can monitor movement across the shaft length.
Thank you. I learned alot.
thank you God bless you, that was great
Glad you enjoyed it!
Can we do the adjustment in proximitor like we do in transmitters
You cannot adjust the proximitor. This is because there is no scaling taking place inside the proximitor. This function occurs at the monitoring rack. Good question.
Excuse me sir. My name is agus. I have some question related with vibration system.
1. Whats the function for minus DC power supply?
2. Whats correlation between DC power supply and AC power supply which generated by probe?
Answer 1: The polarity doesn't matter unless you are a transistor, which in this case is why the polarity is reversed. For the purpose of understanding how it works, it makes little difference.
Answer2: Think of the AC as DC with a wave. Normal AC changes polarity, this doesn't. You just have to switch a meter to AC to measure the dynamics of the sinewave that is created. It's AC with a voltage bias.
Thank you
You're welcome
The supply given is -24 Volts. Why not a positive supply?
This product was originally invented a long time ago. At that point in time, due to the availability of semiconductors, it was more practical and cost efficient to apply a negative voltage, which provided the proper gate voltage for the more common semiconductor type. It is no longer a thing that people consider during instrument design. The -24volts has been adopted by all the newer iterations of the product line.
very informative
Thank you.
Jadi ini sensor proximitor atay vibration mas. Maaf masih awam
Hello, this video was very useful. How can we contact with you?
I have my contact information listed on my UA-cam page. Thanks for watching.
sr. if you need more info about it, i can send it to you,