why are set -10vdc in bently neveda vibration system.
Answers were Sorted based on User's Feedback
Answer / mohd
when the shaft moves toward the probe ,the gap vpltage will
change and that will be reflect on the negative voltage .
the main idea of using -10Vdc is to avoid interfering with
the noise signal which could give error in the reading .
Is This Answer Correct ? | 8 Yes | 3 No |
Answer / dharmendra borada
Dears,
Bently Nevada Probes having Supply of -24VDC Supply because of NPN Transister used, so Sensor has to work between 0 to -24 VDC Range.
if u see the Graph of it's Vibration charesteristics it will be Linear Between -2 VDC to -22 VDC range & Vibration belongs towards &/or away from the probe.
and we can't say Vibration of M/C will be in which direction happens.
So it is Better to select middle point of it's Range as we can't assume Vibration Direction.
That's y Average/Middle point of Linear Graph range(-2 VDC to -22VDC) is -10 VDC(to Give Justice to Probe.
That's the reason of -10VDC Gap Setting needed.
Dear's this is the Answer according to my Knowledge.
Thanks in Advance.
Regards,
Dharmendra Borad
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / sudhansu
Bentil naveda vibration senser works on proximity principle of eady current type.so as the manufacturer define it as npn transister type so we got a negative proportional voltage with respect to gap generated.
so -ve output is due to -1)eady current and 2) for npn transistor.
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / manishahir
-ve for npn transistor and 10 for both side measure vibration ie towards the probe and opposite side of probe.so its change -10 to -24 and -10 to 0.
Is This Answer Correct ? | 1 Yes | 2 No |
what are the use of belew gear in general ??
Explain types of valves?
what is the difference between Digital output DO signals /Commands for start/stop and Solenoid valves ??
Why we. Don't measure current in parallel? Why we measure current in series and why we measure voltage in parallel only?
2 Answers Almeer Technical Services,
What is a flow meter?
sir ,iam in dem urgent need of HPCL Paper of Instrumentation Branch plz send me at your earliest convenience at ujjwal_sharma1983@yahoo.com
why ultra sonic level transmitter is installed in 90 degree?
What are all the type of vibration measurement measuring in turbine, what is the output of vibration sensor.
principle of rtd
when the instrument tapping on pipe line is located below and transmitter is located above the tapping point for liquid service transmitter, what should we do, is there any additional drain valve is required??
what the differant between Wet Leg /Dry Leg
Which topics are covered in Process Control?