Answer / kandan

since we use 4 to 20ma transmission signal,the voltage drop
at the o/p is 1 to 5V.

In the O/P 250 ohm resistance is used.So when the signal is
4ma then 4*250=1V

when the signal is 20ma,then the O/P is 20*250=5V.

Answer / ranjit mallick

Because upto 1 volt and 4ma the signal can be trigered due
to some earth leakage, bias malfunction, noise signal,
small magnetic interferance etc.Hence it is used as lower
tolerance to avoid unwanted triggering of the instrument
and can be termed as floating output.

Answer / abdul hakkem

for analog arithmetic calculation can be done only by Voltage, thats way 4-20 mA is converted & taken as a voltage output

Answer / rajesh

Because of the Burden resistance of the Instruments/Load of

PLC are normally 250ohms

So Its Corresponding we will get 1 to 5V

role of electrical engineer in the instrumentation industry

1 Answers  

---

What is profibus?

0 Answers  

---

Is an analogue only transmitter as accurate as a smart transmitter?

2 Answers   SCA,

---

if the neutral and ground of ups voltege are connected together in the source itslef then why the voltege b/w neutral and ground comes positive in some other destination inspite of having earth pit. how can we mimmise this?

1 Answers  

---

A pressure transmitter with a range of 0-100 bar.The accuracy of the instrument is 1% of upper range value? The pressure indicating transmitter is showing the system pressure is 50 bar. b. When you include the error, what is the minimum possible pressure in our fuel gas system? i. 49.5 bar ii. 49 bar iii. 1 bar iv. 0.5 bar We want to change the filter cartridge. We must depressure the fuel gas system. c. After we depressure the system in preparation for maintenance, the transmitter displays a pressure of +0.1 bar. At this time, what is the possible range of pressures in our fuel system? i. +0.099 to +0.101 bar ii. 0 to +0.2 bar iii. -0.1 to +0.3 bar iv. -0.9 to +1.1 bar

3 Answers  

---

---

how to calibrate mass flow meter (Coriolis)? Example calibration range: 0 to 2500 kg/hr line size 3" fluid: Etheline glycol (MEG)

0 Answers   Honeywell,

---

Tyes of interface level measurement and how to use that technique for interface level measurement,

0 Answers  

---

where the use of direct action control valve?

2 Answers  

---

what is absolute pressure and where use in process?

3 Answers  

---

can you tell me how many stages in steam turbine of 10 MW power plant

2 Answers  

---

How does a single acting, spring return ball valve actually work? Does it require continuous air supply? 

0 Answers   Process Control Technologies,

---

i want to know for good instrument engineer or success how many software knowledage required & from which university

0 Answers  

---