please can anyone tell me in detail, what's mean by open
loop and close loop?
Answers were Sorted based on User's Feedback
Answer / siddhartha mishra
In open loop the varialble is for monitoring purpose e.g.
if we are using a pressure transmitter of pressure
indication only then the connection will be said to be open
loop whereas in closed lood the varialble is measured and
controlled also e.g. if we are using the pressure
transmitter as well as a control valve to maintain the
pressure in the tank then the connections will be said to
be in closed loop
Is This Answer Correct ? | 21 Yes | 2 No |
In open loop you will not get the feeddack from system
whereas in closed loop you will get the feedback from the
system.
Is This Answer Correct ? | 20 Yes | 2 No |
Answer / senthil.doosan
example for open loop - u can only monitor the output of
the transmitter(pressure,flow,temp.level)
example for closed loop-u can monitor the output of the
transmitter (pressure,flow,temp.level) and u can control
the process by using these parameters feedback by final
control element.
Is This Answer Correct ? | 16 Yes | 1 No |
Answer / jayesh
in open loop feed back is not used betwen out put and in put
and
in closed loop feed back is used betweemn out and in put .
Is This Answer Correct ? | 3 Yes | 0 No |
Answer / akhil pawar
in open loop,op signal is not given to set point again,
means feedback is absent.so if op is not as we desird we
have to adjust it manually.
while in closed loop, op value is given to set point through
feedback path. when op value is given to set point , it
compare it and produce error signal which processes further
and desired value for op is adjusted autmatically.
in all modern control system, feedback is used.
Is This Answer Correct ? | 2 Yes | 0 No |
I want to use 1/2 inch SS316 tube in my high pressure & temperature (64 kg/cm2 & 500 deg C)after condensate pot in pressure tranmistter. 1) Is it possible to use 1/2" ss316 tube in high pressure and temperature line. Tube manufacturer is local vendor. 2)On sarting the plant, We need to do system fluse that time condesate is not in the condesate pot so steam is directly contact with the tube. We have no exact calculation to know our tube is ok or nor at this time. pleae,reply.
why twisted pair of wires is used in instrumentation ?
Explain the difference between the types of input variables plc?
Anybody know how to create a ladder programme for power switch in TV remote without using counter... ie TV can be turn on and turn off using single push button switch... on pressing the switch first time TV turn on and hold the on state till i press the switch again, and after TV turn off.
what is absolute pressure and where use in process?
what is difference btween rotameter and orifice plate?
How would you choose differential range?
what's the minimum level required of SIL (safety integrity level)to use fire and gas system?
how to calibrate the radar transmitter for measuring the exact tank level if tank is having agitator moving continiously because due to agitator tank surface level will vary every time.
HOW CREATED LP & HP PRESURES IN DRUM FOR DRUM LEVEL MEASUREMENT!
i need some objective type questions in instrumentation
how control valve works?