Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / abhishek k sharma
1:-4ma - 20ma are used to ged know about the live zero
positon.it means that if we use 0ma then we cannot get
excect error as postioner do not gos negative values.
2:- also we have less chances of noise in 4ma to 20ma range
which help us to carry out calibration.
3:- it do not produces spack if we joints its (+)/(-) so
can be used in hazard conditions.
4:-it is idealy accepted for calibration of instruments by
all.
| Is This Answer Correct ? | 6 Yes | 4 No |
Post New Answer View All Answers
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.
can we create an interrupt in plc through scada?
I need to know steps to Calibration Valve Guard......
how many types of preheaters are in cement industry & what r they can any body explain?
How to calculate mmwc values into tonnes?
Hi Friends , i need one urgent help , i am preparing for M.tech entrance examination , i need some obejective questions related to instrumentation field. where can i get those ? can anyone help me pls ?
Which type of diaphragm use in costic line, dm water line, natural gas line, oil line?
Drum level tx with GP4 with zero elevation:7300mmh20 on HP and 8050mmh2o on LP as range but on commissioning the tx readiing is max,Why this reading?
Can any body help to get Rsemulator 5000 free from internet if possible then give me any link or any help .
how to measure draft pressure in transmitter pl. give its single line digram
how to calculate range of level transmitter?
How to calibration coriolis flow meter?
Why does a pressure gauge installed on reactor, doesn't have any vent line below to release the pressure? Is it any kind of designing mistake or it actually does not require any vent line? And if it does not require any vent line below it then how we are gonna release the pressure built inside the pressure gauge?
What is mean by analytical instrumentation?
Im having problems with interfase betwen SPI v7.0 and SPPID v5.05. Previous versions of Intools shoul be fixed with SPPIDproj.ocx file. It was necessary to replace this file with one that allows the connection between different versions of SPPID. It is necessary in the current version to do the same?Thanks
