why we use negative 24vdc to a proximeter

Answer Posted / munty

we use negative supply bcz the vibration sensor based on PNP
TRAANSISTOR philosophy, PNP the base voltage suppose to be
nagative.

Is This Answer Correct ?    9 Yes 1 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

What do you know about gail?

2020


How to Calibrate Level Switch in field

762


Any one can help me to identified, how can we interchange the device in FF

2296


give some question relative instrument fitter?

5771


What is standard of DCS panel design?and what is step of DCS panel design?wiring and type of connector(screw or DB connector)

1693






A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.

1667


Why mmwc unit is used?

738


what is sliding spool valves?

1797


How you calibrate absolute pressure with the calibration range of 0 to 1000 0C Absolute. Please explain the procedure for calibration.

1238


What is the PLC configuration in Cement industry?

3246


what different types of problems do occur while doing instrumentation commisioning and how to solve them? please explain in detail

1296


where proximity sensor installed on tank in loading arm application

1748


what is function of switch, and how is it work, explain with difination

1776


What is limitation of the ht.of the displacer of a level trol?

1808


how to tune siemens sipart electro pneumatic positioner..plz tel me..

1643