Answer / ram

In pid controller P stands for PROPORTIONAL BAND, I for
INTEGRAL MODE & D for DERIVATIVE MODE. We can also use this
mode for controlling purpose as individual mode. Means we
can use P mode alone or I mode or PI mode PD also. But using
this mode individuals will not provide the desired accurate
output.

So we need to use all the three parameters together to get
good accurate control over process variable.
In this PID mode P(ON-OFF) will try to give the output value
as possible as close to the set value but it will never get
the actual output to the set value. it has some limitations.
So to compensate for the errors remain P mode the I mode is
used. it takes the output value to the set point but after
certain time. it takes some time to get the desired output.
some oscillations are there due to I mode.

So finally to eliminate the damped response of I mode we use
the D mode. it will compensate for the offset error occurs
due to I mode. & try to reaches the desired output level fast.

Answer / muthu

to get free oscillated output for given input, PID
controller uses.

in pid setting, the following parameters are considered.

i) proportional gain, kp
ii) integral gain, ki
iii) derivative gain, kd

what is dry leg and wet leg in transmeter calibration?

3 Answers  

---

I have a steam flow DP transmitter that has output swinging. Steam valve is in manual.I have good steam pressure. The impulse lines have steam tracing on them. The steam tracing has a hole in it that is blowing raw steam on the high side impulse line only. Could this be causing the swinging?

1 Answers   Honeywell,

---

What is pressure,What is temperature,What is flow,What is level

4 Answers   Keltech, Petrofac,

---

what is the full formof HART

7 Answers  

---

what is the difference between RS 232,RS 485,RS 422, how they different from each other

15 Answers   TCS,

---

---

Absolute pressure is 700psi,what will be the gauge pressure?

1 Answers   IFFCO,

---

Whether the DP transmitter can be utilised in the medium of Vaccum for the measurement of Level?

10 Answers  

---

WHAT IS THE DIFFERENCE B/W PLC and DCS

10 Answers   Bhel,

---

I have a close vessel tank which is under vaccum when in running condition so pl. Provide it's range for dp type tx whose flange to flange distance is 440 mm and density is 1

1 Answers  

---

i have a dp tx range is 5000mmwc. in which calibration i use in a open tank.1.5*3.5*2.5 mtr.for level msmnt. what is the calculation.

2 Answers   Bajaj Hindusthan,

---

What is an analog input - output , digital input - output . Any example ???? How they r known its ai-ao or di - do

4 Answers   Torrent Pharma,

---

What is the DIfferences between SMART transmitters and PROFIBUS DP/PA Transmitters?

4 Answers  

---