Answer / bunny

Suppose the range of process variable is
(0-150)PSI.So when the input is zero,the value in
instrument,say a transmiter connected to measure the
pressure,will shows 4mA.This is live zero.i.e,even if the
input is zero,output has some value.
Lets assume the instrument is faulty or the
power supply to the instrument is cuts off.Then it will
show zero reading.This is called dead zero.i.e,when the
instrument is faulty,it will shows the real zero value.

Answer / devendra_kushwaha27

Live Zero means 4MA
Dead Zero means below 4 MA

Answer / inzamam

When the working instrument shows zero as its output ....it is called as live zero........

When the instrument fails , thereby showing zero as their output , it is called as dead zero .

Please can anybody tell me the step by step procedure for calibrating the Pr,Lvl,Fl,Temp transmitter on process?

1 Answers  

---

What is loop or pigtail in an impulse line?

8 Answers   Qatar Airlines, Qatar Petroleums,

---

List three types Level Transmitters with their working principles

1 Answers   ABB, Bapco Bahrain Petroleum Company,

---

hi my name is rakesh patel i just complited my be in instrumentation & control now i am going to working as a validation engineer in a poject department so what is a scope in a future as a validation engginer ? what line is good for me can any bady give me complete solution please? your regard rakesh patel

0 Answers  

---

how ranges is decided for drum level or dearator level,in my pplant i have seen for boiler drum range is -1000 to 1000mmwc, while for dearator -2000 to 0 mmwc ,why they decided to take this range ?

2 Answers  

---

What is inside the PLC panel? How does instruments communicate to DCS computer via PLC? What is the type of wiring in PLC connections? Please answer... Thanks

1 Answers  

---

Qatar fertilizer call me for interview as Instrumentation Project Engineer. Please let me know what kind of question they asked ? ALso they said they will take Written test, any idea about this written test ?

1 Answers   QAFCO,

---

what is virtual instrumentation

0 Answers  

---

What is Droop? What is Step/Gradient Limiter in Turbine Governor control?

0 Answers  

---

What is meant by calibration

5 Answers  

---

what is ment by PID controllers? explain with example?

2 Answers  

---

where cascade loop use ?

0 Answers   KNPC, KOC,

---