Interested to Buy Any Domain ? << Click Here >> for more details...
While preparing the graphic diagrams trend display, 3 types
of trends are prepared by Yokogawa system vender. These are
for process variable, manipulated variable & set point
variable.
Why these 3 trends are required? Explain the purpose of
these 3 trends.
- 1 Answers
- 3909 Views
- I also Faced
- E-Mail Answers
Answer Posted / dev
This is process control related que.
First, process variable is what we need to measure for
specified process. Suppose, water tank in which exit temp.
is to be measure then temp. is our process variable for what
we are doing the process.
Second one, manipulated variable is what we use its value to
control the process variable. Taking the above ex. of exit
temp. water tank process then manipulated variable is the
most effective parameter which affects the exit temp.
sensitively say water flow in the tank, then the water flow
is the manipulated variable for temp. control..
And the third and last is, the set point, which is our motto
for the process. i.e. in above ex. exit temp. should not go
beyond the set point. We have to maintain the set point to
restrain the damage.... practically process variable always
fluctuates or may get set point but remember that it won't
steady....
This all variables are considered mostly when we use
cascade control in the single process...
Hope it will explain why all the variables are imp. for
process.. if not yet then u can mail me
e-mail: devashishbhatt3@gmail.com
| Is This Answer Correct ? | 3 Yes | 0 No |
Post New Answer View All Answers
what is the process to make control schematic ?
How to Calibrate Vibration Probe (Axial, Redial) in field
what is easiest way to read STL language in PLC?
what is zero and span ?
please someone tell me what is function of vibration sencer and how many types and how to control viberation.please. my id is jimmykhan077@gmail.com
Name different parts of a pressure gauge. Explain the use of hair spring in the pressure gauge.
which type of filter gives the constant phase characteristics?
State bernoulli’s application.
List three types Level Gauges with their working principles
Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
How many interlocks at turbine? Plz explain briefly
How does your previous experience relate to the job you are applying for ?
principle of automatic votage regulator
What is the right procedure for adjusting the gap voltage of bently nevada vibration sensor?
Can anybody tell me how to select the size of earthing cable for DCS & PLC system.Please tell me any relevant answer here or mail it to me.
