why we set -10 volt in vibration sensor output,why not +10 volt
Answers were Sorted based on User's Feedback
Answer / seenu
What u said all are correct but they are using PNP Transistor
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / omar faruk
1. Noise are lesser added in negative voltage supply rather than positive supply.
2. To activate NPN transistor Negative Supply is mandatory.
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / kamrul haque
Vibration Sensor are NPN transistor so they can give negative voltage only so they are set -10 v only.its because transistor works linear in -2 to -18v so -2 to-10 8 volts same in -10 to -18 so it can measure both away and near distnce.
Is This Answer Correct ? | 1 Yes | 1 No |
Hi friends, from Aug 4th onwards iam getting spikes for analog inputs in our DCS for a period of 800ms. I throughly checked every thing, finally i found that the DI, DO's from MCC panels shields are terminated in the Signal Earth where Analog Input signals shields are terminated. Is there any problem with this type of termination?. i checked the induction voltage from MCC and getting around 25VAC, please suggest me in this concern. Our plant is 8months old only. DCS is Siemens Make Simatic PCS7, and the transmitters are Yokogawa make.
Definition of reverse and acting controllers:
1.Give example of analog and digital signal 2. What is yhe advantage of 8086 than 8085
5 Answers Bhel, College School Exams Tests, Profitec,
what is the procedure for auto tune in masoneialn 12300 series displacer type transmitter?
in mass flow meter what is drive friquancy ?
How a oxygen sensor & analyzer work at boiler or furnace, what’s the principle & science is beyond this, How O2 sensor scene & convert signal & move toward analyzer & analyzer show reading in percent?
1 Answers GS Engineering Construction, KNIC,
What is compensation for flow ? Why we use compensation ? What are the factors of different compensation ? We not use then what problems may happen ?
IS THEIR ANY AGEING EFFECT ON FLOW NOZZLE, ORIFICE, MANIFOLD, OR TRANSMITTER ?
How does your previous experience relate to the job you are applying for ?
What is difference between scada and virtual instrumentation?
relation between flow and differential pressure.
how to use level tranasmitter in closed tank application.?