Answer / inst

DP switch have two ports that is high and low..Example : Our s.p is 50 psi...Forfor this we have to apply pressure to high port  at the same time lp port should be open to atmosphere..When pressure reached 50 psi switch contact will be changed..

Answer / rahul

For DP switch calibration first apply zero pressure to low side and gradually increase high side pressure upto dp range. (0 to high) then increase low side pressure upto pressure previously applied on high side ( high to 0). then again increase high side pressure upto dp range (0 to high). then increse low side pressure upto equilizing with high side pressure ( high to 0) . this process will go more than 5 scale to have more accuracy upto maximum operating line pressure.

What is output of Thermocouple at 25 deg c

10 Answers   TATA,

---

types of valves

3 Answers   Bindal Papers, Kuwait Oil Company,

---

difference between null and deflecting instrument.

5 Answers   ONGC,

---

WHAT IS THE DIFF BETWEEN FREQUENCY AND INTENSITY?HOW IT WORKS IN FLAME SCANNER ?

1 Answers  

---

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

2 Answers  

---

how to calculate flow by dp transmitter?

4 Answers  

---

what is zero and span ?

0 Answers  

---

in plc source and sink meaning?

1 Answers   CGL,

---

how pressure reduce through pressure control valve? suppose we have to reduce 20 kg pressure to 10 kg pressure , then what we do ? open the valve or close the valve , initially it is 20 % is upon ( for ur knowledge ).

4 Answers   TATA,

---

What is procedure on mmwc in to tph

2 Answers  

---

What is scan time of PLC?

2 Answers   Gujarat Borosil,

---

what is the thermocuple compensation circuit

3 Answers  

---