Why any transmitter signal is 4-20 mA only
Why is started from lower range 4 mA and upper range is
20mA.

Answer Posted / p.v.srikumar

because if use 0 -20 mA as 0-100% there is any signal cable
damage or cable open it will show only 0%. if use 4-20mA as
0-100% it will show bad process value(live zero).

Is This Answer Correct ?    13 Yes 9 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

can anyone guide me how to get any of the previous year GAIL question papers? are they available? 0n 2nd august i have to take the written test.

1465


how will you check torque value during Factory acceptance Test for control valve/ESD ON/OFF VALE how will you confirm this torque value is being correct, Which document will you be refer.

2015


Identification of ss fittings, pilot valves, relief valve.

1391


What is the use of double seated valve?

735


Can any one send me IOCL instrumentation question papers.. i dont know the pattern of the questions and what to prepare can any one help me on this .. my email id is anwarnishil@gmail.com

1720






what is the different between deflection type measurement and null type measurement in RTD?

1453


Explain an adaptive / self-tuning controller’s major draw card.

1861


Why boiler chimney area  oxyden sensor fixing? 

2047


What are different types of orifice plates? State their uses.

639


Emergency Shutdown Systems/ Plant Shutdown System.

1753


Can any body tell me about SAP MAINTINANCE MODULE. WHAT IS its function and application. And study material Source about it. I shall be very thankful.

1496


how works encoder in plc

1591


What is the difference between mmwc and mmwg?

860


Explain plc level and its type?

749


Can any one tell me what type of question asked for instrumentation and control interview panel??? pls mail ramashankar.goel@gmail.com

491