Why we use 4 to 20 mA, (This is International Standard)
instaed of this can we use 4-16, or 4-24 or 3- 15 or any
other range
Answer Posted / samrat kar
Answers 5 & 6 are totally correct.. just adding another point.
20 mA as upper value is used to keep electrical components
intrinsically safe at hazardous area.
| Is This Answer Correct ? | 8 Yes | 3 No |
Post New Answer View All Answers
Good evening all I need a small favour regarding reliance paper i wanna probable sample papers(e&i) of reliance. if any of u have any idea about dis then plz mail me back.i belongs to electronics and instrumentation engg.so i need e&i papers. thanking u....
how to tune siemens sipart electro pneumatic positioner..plz tel me..
hi,i am doing 3 year in electronic and instrumentation engineering. what type of aptitude questions will be asked in a core industries and how can i improve my skills in instrumentation?
What are the key features of a Distributed Control System? describing the various layers (sensor through to business system interfaces) as well as the hardware, software and security aspects of the DCS.
it is possible to check the fail safe condition in pressure transmitter. if possible how?
how to measure draft pressure in transmitter pl. give its single line digram
explain key exchanges in all security modes WPA,WPA2,TLS?
Can any one tell me what type of question asked for instrumentation and control interview panel??? pls mail ramashankar.goel@gmail.com
Explain the mechanism behind the turbine meter.
What is difference between “Fault Tolerant” & “Fault avoidance” PLC? Application where these system s are used?
Explain pH, Conductivity.
I need to know steps to Calibration Valve Guard......
What is the difference between uv and ir scanners? and what is the workig principle of both
Difference between ultra sonic flow meter
(1) In turbine, what does term CDP, NI, NH, HSSOC, means. (2) What is the purpose of LO overhead tank in turbines.(3) An equipment is certified for EEX, IA, IIC,T6, what do you under stand by this.(4) what is SURGE, and how it is prevented, what is the purpose of bypass valve across AS valve.(5) Give 2 application of quartz crystal used for process parameter measurement.(6) what is meant by cold float of compressor shaft. (7) state four different types of flow measurement. For gas flow measurement mmscfd is the common unit. Expand the unit and specify significance of word S in the unit.(8) what is meant by Gap voltage, in vibration measurement. Normally how much Gap voltage is set and state the reason.(9) what will the new flow factor if D/P transmitter is Re-Ranged from 25” wc to 50” wc.(10) what is the usage of QDV & Volume booster.