ravi vaya


{ City } jamnagar
< Country > india
* Profession * instrumentation
User No # 70717
Total Questions Posted # 3
Total Answers Posted # 21

Total Answers Posted for My Questions # 5
Total Views for My Questions # 11836

Users Marked my Answers as Correct # 62
Users Marked my Answers as Wrong # 23
Questions / { ravi vaya }
Questions Answers Category Views Company eMail

What is protocol ?

3 Instrumentation 5802

How to calculate flow of air bubbler type level transmiter  According hight and density 

Qatar Petroleums, RKS,

2 Instrumentation 4663

I faced several time siemens ps2 positioner automatically getting Chang in it's set point direction after auto calibration  So is there any causes biside this or  any  permissives ?

Instrumentation 1371




Answers / { ravi vaya }

Question { 31655 }

can we use a control valve without positioner


Answer

We can use control valve without positioner .
But control valve spring opareting range must be 3 to 15 psi

Is This Answer Correct ?    1 Yes 2 No

Question { Nestle, 24062 }

what is the principal of flow transmeter,level trans
meter,presser transmeter?


Answer

Why flow in squr root ?

Is This Answer Correct ?    0 Yes 0 No


Question { 8502 }

please can anyone tell me in detail, what's mean by open
loop and close loop?


Answer

Open loop is not give as feed back,when close loop is give
as feed back.

An open loop`s example is any PRV,PSV etc.

And

All control valves is close loop.

Is This Answer Correct ?    1 Yes 1 No

Question { 5017 }

HOW TO IDENTIFY THE RELAYS WHICH APPLICATION IN WHICH RELAY
USING


Answer

How works diffrential relay ?

Is This Answer Correct ?    1 Yes 1 No

Question { Hindustan Unilever Limited, 11975 }

WHY WE NOT USE 2-20mA,1-20mA,3-20mA or 10-50mA SIGNAL?
INSTEAD OF 4-20mA.


Answer

Because 4 mA is called live zero of transmeter
If we set 0 mA at 0 pressure ya any ,we can`t deside inst.
is working ok .

And also mA is be a linear from 4 mA

Is This Answer Correct ?    3 Yes 1 No

Question { 2838 }

what is the conductivity sensor output formula and what is
the ph sensor output formula?


Answer

Conductivity in micro seimence = K x 1000000 / resistance

Is This Answer Correct ?    0 Yes 0 No

Question { IBM, 9230 }

how the 2.5bar pressure able to control the 40bar steam


Answer

That's why in high pressures line(like super heater's  steam in power plant)  having double seated globe valves.therefor double seated plugs has line pressure both side equal (upside same and down side same ) is equal to line pressure 0 
So thus, plug will operate according valve's pressure.....

Is This Answer Correct ?    0 Yes 0 No

Question { 15149 }

what is datum line?


Answer

Which point is we can take a refrance point for hight of
level .
Means our level is XXX mm from Datum line .
The bottum of measerd level tank is Datum line

Is This Answer Correct ?    5 Yes 0 No

Question { 5480 }

how the actually positioner of control valve working?
where we gave 3-15psi pressure to I/P converter where it is firstly applied ?- on I/P to positioner then what happen?
is control valve operate on 3-15 psi or its bench pressure?


Answer

Valve Positioner actually working is following steps:
Supose valve is air to open and right now is at it's normal condition.at this condition positioner will not send any air to control valve.

Now given command to 10 percent to open 
So first positioner will send air strat to applying air to actuator ,when actuator will get sufficient air to perform operation it will start opening.
Now when the  valve will reach to the set point mean 10 percent,positioner will stop the air and maintain valve opening at a set point.
This thing is same in the closing

Thous positioner is works  to control the opening and closing .

 

Is This Answer Correct ?    1 Yes 0 No

Question { ABB, 26193 }

how to calibrate absolute pressure transmitter


Answer

Absolute presure is atmospheric pressure + gauge pressure
So,while calibrating Transmeter must add atmospheric
pressure in given presuure .

Is This Answer Correct ?    16 Yes 6 No

Question { 5884 }

Can a Differential Pressure Transmitter be used as a normal
pressure transmitter??


Answer

If the pressure range is low we can use DPT as PT.

Is This Answer Correct ?    13 Yes 4 No

Question { Chevron, 11119 }

suppose in dcs range of a flow transmitter is 10t/hr what
is dp for 50% in 2500mmwc


Answer

Is is required orifice data

Is This Answer Correct ?    4 Yes 7 No

Question { 5228 }

how to calculate interface capelary level transmetar lower
S.G.0.54 and uper S.G. 0.26 and h=490 mm


Answer

Your total lenth is 490 

Now in case of tank is fully filled with the Lighter fluid your transmiter will show 127.4 

And when tank is fully filled with the Heavier fliud tx will show 264.6

Thus ,
Lrv- 127.4
Urv- 264.6

Is This Answer Correct ?    1 Yes 0 No

Question { 4754 }

What is the exact output of eddy current proximity probe? For vibration mesurment?


Answer

Bentley Nevada vibration Prob 's ;
Output is 200 mv per 1 mils with the
Tolerance of + - 11 mv 
Range :   10 -90 mils 


That's why mvolts will between 

10 = 200x10 = 2000mV = -2V
90 = 200x90 =18000mV = -18V

Is This Answer Correct ?    4 Yes 0 No

Question { 5127 }

diff bw range and span?


Answer

Range is operating units of Instruments from lower to higher 

Span is the gap between range. 

Is This Answer Correct ?    2 Yes 0 No

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