in my plant 100% feedwater control v/v is air to close but due to instrument air fail,the valve opens but instead of drum level high its get tripped in low low drum level.the urv of level tx is 0 and lrv is -800.pls tell me the reason. for such behaviour.

1 Answers   Sirpur Paper Mill,

---

what is difference b/w the solinoid volve and autodrain?

3 Answers  

---

why we use 4-20 mA for calibration of the instruments.why we cant use 0-20 mA?

5 Answers  

---

what is the difference between PLC & DCS

17 Answers   L&T,

---

who's take first position in process in the timing of new installation flow transmitter and control vavle. give the answer with logical trick.

2 Answers  

---

in transmiters(rose mount) how to check output 4-20ma ? and input 24v? i need exact explanation?

2 Answers   Adhunik,

---

draw the characteristics of chebyshev filter

0 Answers  

---

what is the best method to measuring level in high pressure and temperture thank?

4 Answers  

---

how can I install "operating system " in may HART communicator? It is damaged, and it doesn't boot up.

1 Answers   ARPC,

---

What kind of feedback is used in DP cells.

1 Answers   CCIE,

---

purpose of absolute ppressure transmitter applcation?

1 Answers  

---

what is the use of glycol filling in seal pot (or) condensate pot in instrument impluse line?

7 Answers  

---