Please why do we use 4-20ma in instrumentation engineering

1 Answers  

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what is mass flow meter principal?

4 Answers   GIL,

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plc trouble shootings?

3 Answers  

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WHY THE DEGREE OF VALVE PLUG AND VALVE SEAT IS SLIGTLY DIFFERENT I CONTROL VALVE TRIM DESIGN

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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Qatar fertilizer call me for interview as Instrumentation Project Engineer. Please let me know what kind of question they asked ? ALso they said they will take Written test, any idea about this written test ?

1 Answers   QAFCO,

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List three types Level Gauges with their working principles

0 Answers   ABB,

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In which principles tx ,pressure gauge,Temp gauge,control valve works?

0 Answers   Bajaj, Professional Instruments,

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What does threshold mean? what does tolerance mean?

1 Answers   DEWA,

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What is Loop Test & What is Loop Checking? Please i need answer for these questions.

2 Answers  

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why does a transmitter o/o signal starts from 3-15psi or 4- 20mA?

11 Answers  

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How does electro magnetic pump works ?

1 Answers   IGCAR,

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