why do 4 mA serves as 0% not 0 mA?

Categories >> Engineering >> Instrumentation
Suggest New Category

Question Posted / carreonjayare

10 Answers
12403 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

why do 4 mA serves as 0% not 0 mA?..

Answer / s.farhan haider rizvi

becouse we can't get 100% sure our device are working
properly or not working.we know that 0 MA DEAD condition
and 4 MA live dead condition,

Is This Answer Correct ?

20 Yes

0 No

why do 4 mA serves as 0% not 0 mA?..

Answer / anzal

to know actual zero or dead zero

Is This Answer Correct ?

17 Yes

1 No

why do 4 mA serves as 0% not 0 mA?..

Answer / harold

4 ma is the live zero

Is This Answer Correct ?

10 Yes

1 No

why do 4 mA serves as 0% not 0 mA?..

Answer / alok kajla

we use 4ma lowest value because it shows that devide is in working condition and at lowst level. if we take 0ma as starting point then we can't differ the situation that device giving lowest value or device is off condition.

Is This Answer Correct ?

10 Yes

4 No

why do 4 mA serves as 0% not 0 mA?..

Answer / azhar mottur

o know actual zero or dead zero

Is This Answer Correct ?

2 Yes

0 No

why do 4 mA serves as 0% not 0 mA?..

Answer / abhishek rathore

4mamp current signal consider as 0% if sensor or wireing fault then signal goes to 0mamp controller or operator understand signal fault mode goes.1,2,3mA not consider because bydeafault 1-3% signal present in the systembut 4mA not goes to signal bydefault .so we are consider 4-20mA signal

Is This Answer Correct ?

2 Yes

0 No

why do 4 mA serves as 0% not 0 mA?..

Answer / ragu.j

All transmitter are working in 1 to 5volts. So, now we
calculate the V=IR. That means Volt equal to
current*Resistance.
for eg :
calculate to(4ma*250ohms)=1000 milli volt or 1volt
and(20ma*250ohms)=5000 millivolts or 5volts.

Is This Answer Correct ?

2 Yes

1 No

why do 4 mA serves as 0% not 0 mA?..

Answer / fred good

we use up to 3.9 ma for powering instruments

Is This Answer Correct ?

1 Yes

2 No

why do 4 mA serves as 0% not 0 mA?..

Answer / urooj

4mA is the leakage current that flows in the circuit even
when the least voltage is appied ..

Is This Answer Correct ?

1 Yes

6 No

why do 4 mA serves as 0% not 0 mA?..

Answer / s hasini

TO MEASURE THE INSTRUMENTAL ERROR

Is This Answer Correct ?

1 Yes

7 No

Post New Answer

More Instrumentation Interview Questions

Why we are using PLC instand of DCS in ESD System? can u explain any one?

2 Answers

What is differnece between leveltroll and interface leveltrol?

2 Answers

what is interlock system and why we use of this?

0 Answers

what is easiest way to read STL language in PLC?

0 Answers LB Industries,

radial & axial vibration sensor output voltage is ac or dc volt?

8 Answers Vedanta, Voltech,

Tell me the field calibration procedure step by step with diagram of pressure gauge, pressure switch, pressure transmitter, temperature switch, level switch, flow switch, flow transmitter.

0 Answers

Why we use negetive (-)voltage in vibration system

4 Answers

What is difference between scada and virtual instrumentation?

1 Answers

What is the difference between pneumatic and electro pnematic positioner?

3 Answers TCS,

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

2 Answers

How do you troubleshoot accelerometers used in Vibration monitoring/tripping

1 Answers Air Liquide,

Difference between dcs and plc including date processing and architecture.

0 Answers

For more Instrumentation Interview Questions Click Here