Answer / bala

Flame Scnner Basic function- viewing flame in furnace

It has provided in order to avoid unwante boiler trip

Pull in / pull out manual set value from 0 - 100 %

pull in always higher than pull out eg- 40 % & pull out 20 %

when initial flame exceed above 40 % it will consider as
flame

when flame drop drop from 40 - 20 it will consider as flame

when drop below 20 % it will take as no flame signal

the o/p contact flame / noflame will be taken for boiler
safty operation

Why 4ma - 20ma signal used in instrumentation??

5 Answers  

---

Level in tank under vacuum (Ex: Condensate Tank of Power Plant)is measured using D. P. type level transmitter. Tank is subjected to vacuum of 755mmHg. Is it possible to fill wet leg ( i.e. leg connected to top of vessel with low point of D. P. xmtr) with water?. Are there chances of water getting sucked under vacuum? if yes, what is the solution?

3 Answers  

---

i have one temperature TX in my loop check time once i was remove elament temp gose maximum then i am conect corectly but still now temp showing maximum what can i do this problem?

2 Answers  

---

Ohm’s law, kirchoff’s law, pascal’s law, Bernoulli’s therem,

1 Answers   CCIE, Emcure,

---

Why in turbine used two critical speed band ?

1 Answers   Ankit Metal Power,

---

In oil & gas industries and petrochemical industries, there are classification of zones like zone 0, zone 1, zone 2. Is there any differences in voltages or power supply supplied for the process instruments, control instruments depending on the zones

1 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 an analog input - output , digital input - output . Any example ???? How they r known its ai-ao or di - do

4 Answers   Torrent Pharma,

---

what is "smart" in smart transmitter ?

4 Answers  

---

What is the difference between fire detector and smoke detector?

5 Answers  

---

how to make a calliberation for deffirential pressure

3 Answers  

---

Who to difference between analog in & analog out in dcs?

0 Answers  

---