Answer / honey sekar

Because OF that Bently nevada probe proximitors are made by
PNP principle ,some of proximitor's we are using +24 vdc
which was made by NPN principle in few plant's

Answer / taha

to generate frequency required -24v as minimum

Answer / s n vyas

For High speed rotating equipment only, we are using this negative voltage for vibration sensor. This negative voltage is always set as gap voltage between the sensor and surface of the rotating equipment. This gap voltage is always set as -10Vdc. This because of Ratio frequency, which is created by the controller of vibration sensor. These frequencies are generated under negative voltage only. Which is also varies with respect to eddy current flow. The amplitude of this ratio frequency is measured as vibration. For your information, Noise level is very less in negative voltage compare than positive voltage which will not affect the sensitive range of measurement of vibration. For your information:-This concept is used in Bently Nevada vibration monitoring system.

Answer / ashok

1. Equipment needs safe
2. If cable damaged the prox- tip not to make short with
card which convert in to mA

I work on a electronic positioner transmitter 4211 at the field.I connect my multimeter in series to get the current output then I calibrate it to 4ma in 0% of position of the valve and 20ma in 100% position of the valve.My problem is in the field I get the correct output current based on my multimeter but in the dcs they only receive 40% in a output 20ma of this positioner.Then I try to simulate in this analog card and they receive the equivalent percent on the value that I simulated.Is ther any possibility to reset the zero and span of this positioner 4211 fisher.And what other possibility I can do to fixed this.This is my email add ( landicho_randy@yahoo.com )

4 Answers  

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why orfice is not used for main steam flow calculation

0 Answers   OEG,

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0 Answers  

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send me model hpcl questions pleas..........my mail id mohideen.dharvesh@gmail.com

0 Answers   HPCL,

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i want all model questions paper for robert bosch

1 Answers   Bosch, Patni,

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Condensation within a sight glass? Would you expect there to be more problems when using a sight glass if there is condensation on the inside or the outside of the glass, and why?

1 Answers  

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What should be the main consideration while starting the Rotating compressor when we dont know the cut in and the cut off pressure setting of the pressure switch

0 Answers  

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Why rdt and thermocouple both give different output .and one things more, how to generate  ohm or mili volt  plz mail me merajalam143545@yahoo.com

0 Answers   Samsung,

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what is a mapping in plc & dcs

1 Answers   Arctern, ARM Cement,

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Absolute pressure is 700psi,what will be the gauge pressure?

1 Answers   IFFCO,

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Functions of electropneumatic valve positioner:

4 Answers  

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What is the load line in control valve?

1 Answers   IFFCO,

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