Answer / senthil ramanujam mohan

I can give you simple example:-

Consider a temperature controller(on/off valve),
setpoint - 100deg
Offset - (-4)
dead band - 2
ERROR - SETPOINT - ACTUAL VALUE

If temperature raises from 90deg>>>>94>>at >96degrees the
valve closes.this is becoz we have an OFFSET of (-4
degrees)(setpoint - offset value)
So,now the valve is closed.temperature drops down from
96degrees<<95<< at 94degrees the valve starts open.this is
becoz we have a DEADBAND of 2degrees.

Error(contrl valve):-
setpoint - 100degree and actual value - 90degrees.
temp range - ( 0 to 200)for error scaling(becoz
controller works from 0 to 100%)
error scaling = 100/200 - 0.2 which is multiplying
factor for error to the controller
Finally,
ERROR = [ SETPOINT - ACTUAL VALUE ] X ERROR SCALING.
[ 100 - 90 ] X 0.2
[ 10 ] X 0.2
2.

hope you guys understand.

SOME OF YOUR QUESTIONS ARE NOT MAKING ANY SENSE SO TRY AND PUT IN A LITTLE BIT MORE EFFORT BEFORE YOU POST A QUESTION. WE WILL ONLY HELP THOSE WHO WE CAN SEE ARE TRYING TO HELP THEMSELVES.

0 Answers  

---

What are the processes Variables?

4 Answers  

---

What is the difference in clamp on type and inline type ultrasonic flow transmitter.

1 Answers  

---

what are the standards used for earthing instruments in the field?

1 Answers  

---

What is feedback system.

1 Answers   CCIE,

---

---

what is the difference between dcs & plc

2 Answers  

---

why we use cascade control and feed foreword control in 3 element control of boiler drum ?what is feed forward and cascade control system ?

0 Answers   Visa Steel,

---

What is intrinsic safety mean.

0 Answers   CCIE,

---

What is minimum distance between three thermocouples (2oo3) mounted on same pipe line (20")? Technically accepted by stright line mounted or circler mounted?

1 Answers  

---

WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?

8 Answers  

---

where the use of direct action control valve?

2 Answers  

---

Hi, I am Newely Joined in Construction company instrument engineer? Any one can Plz tell me How can I advanced preparation for Releated Engineering and construction Documents?

0 Answers  

---