Related to control system, What is difference between 4-20
mA active & 4-20 mA pasive signal.
Answer / janes
4-20mA Active : 2 wire device. same pair of wire is used
for the Power supply and Output 4-20 mA Signal.
4-20mA Pasive : 4 wire Device. Device having external power
supply -110 Vac / 230 Vac / 24 Vdc and generate the 4-20mA.
Is This Answer Correct ? | 32 Yes | 0 No |
In control valve there are two type of valve seat we can use metal to metal seat & soft seat.On this valve seat i have following doubt. 1)I have never seen practically the internal assembly of valve so my doubt is that basically weather the seat is soft seat or metal its basic MOC is same as valve body(SS or CS) only in soft seat we are using PTFE ring & place on valve seat & in metal this PTFE ring is not threr am i correct??????? 2)what are the common general rule for using metal to metal seat & soft seat,means its depend on process parameter like liquid,gas, steam & on valve leakage class.
How to calibrate H2s Dectector
I have a Control VAlve having size of 2 ".Only the known parameter is Pressure drop . Its 2 Kg. Then How to calculate control valve sizing means Cv.
what is the meaning of wet leg & where is it used?
what is orfics working in main steam line. is it increase pressure, velocity of steam flow and dicrease steam flow rate. or any other
what is the basic principal of vertax flow meter
3 Answers Balrampur Chini Mill, Saba,
why we are using magnet for calibration of gas detector?
I want to know about DDCMIS in detail ? please explain it. Also give name of reference books in which it is explained in detail in very simple manner.
why we use -ve voltages in vibration prob?
why we take 4 to 20 mA as out put of every instrument like pressure transmittre ?why we cant take 0 to 20mA as output?
Yokogawa mass flow meter shows negative reading...what r the main causes for this problem?...
What is basic of instrumentation