Answer / shajee

4-20 ma signals and 1 to 5 volts used instruments

Answer / animesh

4 -20ma=1-5vdc
we use 250ohmresistor
so1v/250ohm=4ma
&5v/250ohm=20ma

Answer / vijayrathod

analog signal and digital signal

if RTD damage in plant, how we know?

5 Answers   Reliance,

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Distributed control system

1 Answers   CCIE,

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What is the difference between a Extension cable and a copnesating cable.Where can we use compensating cable. Is anywhere compensating cable are used for mv transmission to the indicator.

1 Answers  

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what is the working principle of hydra step(electronic level indicator)?

2 Answers   Bengal Energy, Lanco,

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Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72

0 Answers  

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what are the steps to follow force a particular input or out put from ics triplex esd system?

1 Answers  

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how can we calibate ph meter. how can we calibrat conductivimeter how can we calibrat massflowmeter & it s working.

1 Answers  

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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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Draw block digram for well head from well to shipping pump?

0 Answers  

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Why Ma signal is using for control system?

1 Answers   Petrofac,

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To become an Instrument DESIGN engineer, is there any softwares or training to become Instrument Design engineer, plz suggest me, Iam very much interested in designing.

0 Answers  

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What is the detail function of I/O card in DCS ? Why we dont use the I/O directly with controller?

3 Answers   Kekran Mekran, TCE,

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