Answer / madhava reddy

O2 analyzer is used in all types of boilers like CFBC and
AFBC etc..role of this analyzers to measure the O2
concentration after the ECONOMIZER ,it is a normal value like
(3 to 4) no problem ,if any variotions obeserved based on
that value we can increase/decrease SA fan air into the boiler

Answer / msp

:- If analyzer showing wrong on DCS than first I will
forced the analyzer value on the DCS if any tripping taken
from it.
Through the Multimeter checked the value 4 to 20 mA on DCS
or same on field As per define range in the DCS as well as
analyzer transmitter. If all things are correct than its
calibration was got disturbed. For the calibration
1 For the calibration we need sample gas and instrument air.
2 Connect the both input instrument air and sample air
through the rotameter for flow control of the both air and
sample gas.
3 Power on the analyzer and communicate hart communicator
with the analyzer.
4 For the zero calibration apply the sample gas with the
help of rotameter for flow control on the analyzer. And
press enter on the zero calibration on the hart
communicator.
5 For the span calibration apply the Instrument air with
the help of rotameter for flow control on the analyzer. And
press enter on the span calibration on the hart
communicator.

After calibration save the setting with the help of the
hart communicator.
And cross checked the same 4 to 20 mA by given the
instrument air and sample gas accordingly.

Explain the combusion chamber

0 Answers   IFFCO,

---

plz send me placement paper of ongc

0 Answers   ONGC,

---

why we are using -24 vdc in plc?

1 Answers   CGL,

---

Draw a P& ID showing – orifice flange, plate, dp transmitter, isolation & bypass valves and tubing.

0 Answers   CCIE,

---

Paper Details: company -- Hindustan Copper Limited post -- GET 2008 Date -- 03.08.2008 Dept.-- Electronics?Instrumentation Aptitude -- 70 Technical-- 80 Total Time -- 2hr 30min I have listed the question I could able to remember 1. BCD equivalent of 43 2. value of K for stability of a system from a given equation 3. transformer connection for darlington connection 4. damping of balastic galvanometer 5. advantage of chart-pen recorder over CRo 6. CRO - how to change bandwidth 7. questions on CRO construction 8. reverse saturation current of si diode 9. advantage of wire wound resistance over carbon resistance 10. core material for a small coil 11. max fanout-- TTL/ECL/CMOS/MOS 12. component of resistance of monolithic IC 13. functions of capacitors in multivibrators 14. to change a sawtooth signal into a square wave we use-- schmit trigger/ schottkey diode/ zener diode 15. relation b/w á & â in transistor ckt 16. function of SiO2 layer in fabrication 17. 3 questions on ODD MAN OUT

2 Answers   HCL, L&T,

---

There are two chlorination tonners both are connected to two pressure swithes and the pressure switch is connected to SOV which operates the valve to changeover the tonner selection i.e if pressure one tonner goes low the other tonner should come in line if it is inautomatic selection design a circuit using relays ?

0 Answers  

---

Where Can i take a SPI INtools training in Mumbai? In Rolta India Ltd to whom I should approach regarding of SPI INtools Training?

0 Answers  

---

how to calibrate temprature switch and flow switch ?

1 Answers   Adgas,

---

units of pressure,flow, level,temperature? principle of pressure gauge? calibration of pressure tx., level tx., temperature tx.flow tx.? description of two wire ,three wire and four wire R.T.D.? WHAT IS INPUT AND OUTPUT OF TX.? WHAT IS INPUT AND OUTPUT OF R.T.D. AND THERMOCOUPLE? WHAT IS HOT LOOP AND COLD LOOP? WHAT IS INPUT AND OUT PUT AND OUTPUT OF D.C.S. AND P.L.C.? PRINCIPLE AND WORKING OF HART? WHAT IS PNP AND NPN PROXY? CALIBRATION OF PRESSURE ,LEVEL ,FLOW SWITCH? DESCRIPTION OF FIELDBUS FOUNDATION? WORKING OF SOV.?

2 Answers  

---

what is the hydra step level sensor output value( measuring level of steam drum)

3 Answers   Adani, ITPS,

---

How to calibrate radar lt type transmitter

1 Answers   NTPC,

---

What is 3 element control system

0 Answers  

---