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 .

Specify for Cables - Flame Retardant and Fire Resistant?

0 Answers  

---

we re giviang 24v supply to transmitter and we getting output from tx?now my question is wht we call this complete proces?

2 Answers  

---

what are the possible reasons if a control valve fails to open/close?

1 Answers   DEWA,

---

what is the function of a zener diode ?

2 Answers   Honeywell,

---

Why ac supply load cell is used? Can we use the dc supply load cell?

0 Answers  

---

how to design orifice plate?what is the equation?

0 Answers   REL,

---

How do you identify an orifice in the pipeline?

0 Answers  

---

i am preparing for BARC ,so plz mail me how to prepare for BARC. ALSO IF POSIBLE SOME RELATED QUESTIONS. MY MAIL ID IS khushi_4uall2003@yahoo.co.in

0 Answers  

---

What is difference between magnetic flow transmitter & Electromagnetic flow transmitter?

1 Answers  

---

we have level transmitter for h2s04 storage tank capacity 10k ,always there are failure of transmitter due to failure of magnetic floats ,please come up with solutions at the earliest.

0 Answers   TechNova,

---

i am going to attend ongc exam this coming june for Graduate Engineer Trainee post if anybody knows the question pattern or have experience plz share it with me

3 Answers   ONGC,

---

control valve in manual/auto mode huntting checked spring tention also it is ok.positioner also good condition & incoming inst air line also constant pr.kindly give us correct answer?

5 Answers   Madhu Power,

---