why use 4-20mA in the field of instrumentation?

8 Answers  

---

What is the differaence between PLC and DCS?

6 Answers  

---

What standards are used for earthing of field instruments?

1 Answers  

---

what is the daily job of an instrument commissioning supervisor

1 Answers   Petrofac,

---

How to calibrate a orifice differential pressure flow transmitter in process?

1 Answers  

---

What is shielding effect?

0 Answers   Process Control Technologies,

---

I want to measure bidirectional steam flow? Kindly suggest me a suitable flow meter. steam is superheated at 41kg/cm2, 350°C

2 Answers  

---

Why we not use 2-20Ma or 1-20Ma

5 Answers  

---

How to check the SCAN time of DCS ,n dont give therotical answers .How to check the SCAN time of DCS during FAT?

2 Answers  

---

Can you tell me how we will select RTD and Thermocouples for Temperature applications. I.e How we will choose accurate one for a specefic operation if both having same ranges

3 Answers   Nippon,

---

What are the materials available to prepare individually for competetive exams in Instrumentation field? Plz reply...

0 Answers  

---

what is the difference between E/P positioner and I/P positioner in control valve , in which application the respective positioner are used in.

1 Answers   ABB,

---