Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / parag pathak
Control Valve is final control element of clost loop. So
signal coming to control valve will be in pneumatic form
but depends on size of Valve. It can be 3-15 PSI or 0.2 -
1kg/cm2 but it is not fixed. There is one instrument called
Positioner which will convert 3-15 PSI signal to desired
siganl depending on Control valve.
For any Contol Valve signal will come from Control room in
the form of 4-20 mA. this 4-20 mA signal was converted to 3-
15 PSI signal by instrument called I/P converter. This
siganl will go to positioner and the positioner o/p is
given to valve actuator to get desired opening and closing.
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
any one can send me instrumentation previous interview papers? I prepare for MNC Company Interviews? my mail id- Rakesh.Golla@dodsaldxb.ae , and another mail rakesh.gvk@gmail.com
Give an example where you had aproblem on the job, and tell me how you solved the problem. and the finalvoutcome.
send me HPCL paper
If a control valve is hunting means means if we are giving 50% to the cv, the cv will open at 51% then slowly slwoly it will reaches 49% , so what to do for solve this problem. The cv is double acting and mounted for anti surge operation, it having 4 nos. volume booster, one sov, one positioner, etc..?
What is the cascade control
Describe the function of Accumulator into the Pump
What is super thermocoupal?
what does it mean an active front end in vfd plz explain it briefly
1.what is the effect of vapour presuure in orifice plate flow measurement 2.which is more effective 2 pressure sensors or one single differential pressure sensor in orifice plate measurement 3.how to design a v/i converter and i/v converter 4.how many type of thermocouple are there 5.how many leads are there in thermocouple measurement 6.how pressure sensors are connected in level measurement in differential pressure method 7.what is the output of capacitive pressure sensor (ac or dc),how its o/p is signal charactarized 8.what is the physical meaning of discharge coeeficient,why it is calculated,orifice plate what is its value,why it is less than 1,Q at upstream is equal to or not equal to Q at downstream of orifice plate why?what is vena contracta in orifice plate 9.why rotameter is called variable area flowmeter,it can measure flow even if area is not varying,why it is made tapered 10.design a 10 bit counter ,which counter you will prefer 11.how to remove self heating error in RTD 12.which is more sensitive pt100 or pt50 13.why thermocouple are connected in parallel 14.what is lead contact error in RTD,how to avoid 15.what is P,PI,PID,PD controller,why there is no ID controller 16.what is override,split range,sequential,ratio,feedforward,cascade controller 17.why we moved from SR to JK and then JK to master slave JK flipflop,give correct reason 18.how to measure level of a closed container which contains vapour and liquid,remember no vapour gas should be leaked,so ultrasonic and capacitive is not an option,design another method 19.how to design horse race counter including sensors and signal conditioning element 20.what is bevelling
wich is coming the first HAZOP OR SIL
what is metal of piston ring
can any one tell me when ongc placement test and its forms is available????/ pls tell me if u know
Any one can help me to identified, how can we interchange the device in FF
HOW CREATED LP & HP PRESURES IN DRUM FOR DRUM LEVEL MEASUREMENT!
What is instrumentation control?
