Why 4-20 amps is being used in instruments? Why cant we use any other range instead of 4-20 amps? Why only 4 amps is taken as lower limit and why 20 amps is taken as the higher limit?

0 Answers  

---

what is skin type thermocouple? how it is installed? what is the difference b/w thermocouple & skin type thermocouple? what is gounded & non-grounded thermocoplle? what is the diff b/w these two?

2 Answers   KazStroy Engineering, PSU,

---

in which principle pressure tx,level tx ,flow tx,temp tx ,control valve works?

0 Answers   IOCL, JSW,

---

if differential pressure created by orifice falls below vapour pressure of liquid flowing through it what will happen

1 Answers   BARC,

---

T.x range -0.1 to 0.2 milibar,so how much mili ampear at 0.1 milibar?

7 Answers   Sugar Factory,

---

---

if i want to make a zero trim for mass flow meter the pipe line should be empty or i need to make it full? i really need the answer pls help me

2 Answers  

---

Why thermo wells are used? What materials are used in thermo wells?

0 Answers  

---

Can we measure pressure using differential pressure transmitter? If yes then how?

5 Answers   Reliance,

---

how to check earthing,what is minum ohms for proper earthing

0 Answers  

---

compare the thermocouple and pyrometer,which one is the best?why?

4 Answers   Ramco,

---

What is the exact differences between HART,FOUNDATION FIELDBUS,PROFIBUS?

0 Answers   Jubilant,

---

What is the cv of a control valve?

2 Answers   CCIE,

---