Answer / anshul jaiswal

if we use 0-20 mA scale for 0-100%,then 0% will be read in two cases;1)when instrument has any kind of damage problem(not responding case)& 2)for the ground level reading.so we use 4-20mA which shows 4mA for 0%(ground level) & 20mA for 100%(full value) and 0mA shows that instrument has any damage problem.And guyz,in the range of 4-20mA the calibration shows linear characterstic too.

Answer / ramali

current output is 4-20 mA.
Let take a transmitter operating range is 0-100%
in this case, 0% is only 4 mA,100%is 20 mA.
Because the transmitter have no power,then its output is
0mA.That means zero , live zero.
zero means there is no process is done.
live zero is transmitter have no power,etc.,

Answer / 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).

Answer / yakin patel

Upper all answer is right but its 4ma not 3,2,1 bcz it is calculting prove. Has calcultion

Answer / girish

this answer which are not exact answer
1. signal is linear
2.no noise
3.current signal will not drop

how can i communicate with non-national instruments device with pc via labVIEW8.2

3 Answers   Google, Mico, National Instruments,

---

How to derive IO Count (AI, AO, DI and DO ) from a Field instrument (FI) Bill of Quantities (BOQ) given by client.

1 Answers  

---

Specific gravity.

0 Answers   CCIE,

---

Consider a control valve action,the inlet air pressure is only 6 ksc but physically how it can be operate against 100 ksc line fluid pressure?

2 Answers   SCS,

---

How does your previous experience relate to the job you are applying for ?

0 Answers  

---

---

how to connect 3 wire 4-20 mA transmitter in Plc system PLC system and how explain how the measuring data communicate with plc system.

1 Answers  

---

send me last 5 years questions asked in rrb chennai, for section engineer

0 Answers   RRB,

---

who discoverd ohms law?

3 Answers   HPCL,

---

WHAT IS THE VALUE OF MICRON

2 Answers  

---

What is the use of temprature compensation?

0 Answers  

---

why micro controller 8051/52's clock frequency is internally divide by 12 ?? and why it is further divide by 32 in UART serial communication ??

1 Answers  

---

1)how can calibrate temperature transmitter? 2)how can calibrate flow transmitter? 3)how can calibrate level transmitter?

3 Answers   ccic, Emerson, JK Pharma, NIGC, Rockwell, UltraTech,

---