Answer / xyz

If we do not use 250 ohm resistance then our HART calibrator
shall connect directly to power source, hence it won't be
part of our transmitter loop.

Answer / hansdas b.jaiswal

WE USE 250 OHMS RESISTANCE ACROSS HART CALIBRATOR DURING
CALIBRATION OF TRANSMITTER DUE TO LOAD GIVEN TO TRANSMITTER
FOR COMMUNICATION PURPOSE

Answer / sankar

Loop Impedance required for communicator will be minimum
250ohms

Answer / mohamadmerajalam

 I think 250 ohm use for drop the crrunt of circuit .If  I  use above the 250 ohm  i can't get sufficient output crrunt.one thinks more that if you increase or decrease the ohm as well as output crrunt  will be increase dearead . that's why i can't  exceeds resistance value 

plz send me placement paper of ongc

0 Answers   ONGC,

---

how to write the program for single push button by using ladder diagram

22 Answers   DigiTech,

---

what happen if i install my pressure transmitter below the elevation of pipe in natural gas service. Also support your answer

3 Answers   C2C,

---

Close loop and open loop.

3 Answers   CCIE,

---

What is the difference between HMI and SCADA?

2 Answers  

---

What is governor of turbine?

3 Answers   Reliance,

---

Why the industry's standard current standards are from 4mA to 20mA,not from 0mA or any other range?

3 Answers  

---

Difference between ultrasonic flow meter and radar type flow meter

2 Answers   Dodsal, Qatar Petroleums,

---

Hi, Is there any smart plant instrumentation design training institute in Bangalore?

0 Answers  

---

can any one explain in which term we are flow flow is it volumetric r is it mass? and y

0 Answers  

---

How can we say that accuracy of measurement increases by using 3 or 4 wire RTD? because for example: If resistance of RTD element is say r ohms and Resistance of the cable from transmitter to RTD is R ohms And if 4 wire RTD is used, ____._____________________ R ohms | |_____._____________________ R ohms / \ / r ohms \ \ | |______.__________________ R Ohms | |_______._________________ R ohms Then the actual resistance measured will be: Total = r + R/2 + R/2 = r +R Ohms Note: r+R instead of r ohms. hence error

2 Answers  

---

WHAT PRINCIPLE OF GAS ANALYSER( CO,CO2,N2)

2 Answers   Jubilant Organosys,

---