Answer / seth

Change in process pressure, restriction in one of the
sensing lines, rapid change in temperature, noise in the
signal being returned to the source of indication. (Check
for noise in the shielding-blow down sensing lines-check if
the process media is at the correct operating temp.-make
sure the equalizer valve is closed and the sensing (hi and
lo) lines are open.

Answer / victor edward

check for any air bubbles trapped in the impulse lines. vent
it and flush the lines. it should be solved.

Describe how to calibrate various types of instruments and transmitters using ISA industrial consensus standard techniques.

4 Answers   Reliance,

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Why we use DPT? can we use PT instead of DPT?

2 Answers  

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Sir i am preparing for PSU exam for ONGC but i am not able to get the appropriate syllabus and previous year question papers. Kindly send me the same, that will be a great help from ur side. OR if anyone can plz send me the papers and syllabus please.

11 Answers   Bhel, GAIL, IOCL, ISRO, NTPC, ONGC,

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What is capacity of impulse line tube ...answer in psi

2 Answers   Shell,

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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

0 Answers   BARC,

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when i installed Allen_bradley_RsLogix_500_Pro_V_7.0,after installation it gives the fatal error.it need activation file.from where and how i can find its activation file.

6 Answers  

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How Control valve sizing is done?

3 Answers  

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Explain the difference between mmwc and mmwg?

0 Answers  

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What is surge in compressors? How to detect and control it?

3 Answers   Kharafi National,

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what can of fault ofently come in vibration mesurement?

0 Answers  

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what is mapping in instrumentation and control engineering

2 Answers  

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which type of filter gives the constant phase characteristics?

0 Answers  

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