Question { 12207 }

where is a level displacer is used?

Answer

Displacer type level transmitter is used in interface level
measurement and closed tank level measurement. It is
working under weight loss, the archimedes principle.

Question { Microsoft, 35890 }

Why Mother Board is called Mother Board & not Father Board?

Answer

You say answer that why we are saying
MOTHER COUNTRY,
MOTHER LANGUAGE,
MOTHER TONGUE and etc..
Then you will come to know the real meaning.

Question { TATA, 11908 }

how to callibrate a new i/p converter

Answer

Friends, plz understand the question first. The
interviewers has mentioned "how to calibrate a NEW i/p
converter?"
Why the new i/p needs calibration?

Your answer must be like this..

"Sir, the new i/p would be factory calibrated with high
accuracy master instruments, so before we commission it in
the plant we have can check its output by applying proper
signal, unless we have good accuracy masters we no need to
disturb the calibration. If yes, we can do the calibration
using the 30psi regulated supply, 4-20 mA source, and
receiver gauge."

Question { Honeywell, 47895 }

how to check thermocouple ,its working or not?

Answer

Primarily You can check the continuity of the t/c and
confirm its live or dead, measure the mV for the room
temperature it will show 0 mV. then rub the t/c end with
your hand, so that the mV will increase slightly. To check
it in higher temperatures use temp bath.

Question { 6123 }

how to make a calliberation for deffirential pressure

Answer

DP Transmitter are used in the measurement of level/flow
measurement/DP of filters.. Here both the lp & hp points
are rather important.

To calibrate the transmitter:

confirm the cell and adapter blocks are clear,

Apply both side the equal pressure by opening the equalizer
valve (Less than its MWP-max working pressure),
should be 4 mA. (This is called Static test)

Make zero trim if found error.

Apply the required range of pressure, only in hp side and
zdj to 20 mA. Again chk 0%, if error found adj zero. After
no error found in zero/span then proceed next step.

Apply pressure and note 4-5 points of its range in hp
side., increasing and decreasing (to avoid hystersis error).

Make write protect and calibration tag on transmitter.

Question { 4427 }

Hello-I know this not an engineering question,I am working
in gulf & i want to do correspondence diploma in
instrumentation,can any one give me the address of any
university in which this courses are available.

Answer

Vinayaga mission, Rajasthan University such like these
groups conducting diploma courses in chennai and all over
india, we can do the correspondence diploma through these,
classes not compulsory. Search "vinayaga mission" in
google.com.

Question { 7498 }

what is Micro-switch and where it is used......?

Answer

Micro switch, the name itself says that the switch which
can be operated in the micro movements like
pressure/level/temp sensors fine expansions. It returns
back with the spring operation by switching the potential
free contacts from NO-close & NC-open.

Question { 5999 }

How can we measure the level of a closed system like drum

Answer

We can measure the level of the closed tank using
Differential pressure measurement system, or
ultrasonic level measurement, or
using displacer level measurement system, etc.

Question { 39887 }

what is the difference about HART, and 4-20mA signal?

Answer

HART Communicator - is a device used to communicate with
the HART / SMART family transmitters, used in the process
control.
* To monitor the PV, Current mA value, Sensor Temperature,
* It is used to re-range the transmitter,
* damping adjustment,
* trimming the sensor of zero/lower/upper ranges.
* create the tags/messages of the transmitter.
* Review the complete details of the transmitter.
* Loop testing the control loop (Indicator/Controller), etc.

Whereas the 4-20 mA source is used for the following:

* To simulate the 4-20 mA signal (For calibration of
control valves, loop testing of the closed/open loop).
* Using the high accuracy 250 ohms resistor, we can get 1-
5vdc as the output which is useful for the DCS input.

Question { 7170 }

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

Answer

Your application is same as the Steam drum.

For this kind of level measurement DPT is the best method,
with condensate pot on both leg.

Known density liquid can be filled on both leg.
So only the DP varies with respect to level.

Question { 10031 }

I have seen the Temperature element (T/C & RTD) installed
in process line on 45 degree position, Why? What it mean?
How many types of tapping position for temperature elements?

Answer

The temperature probes will be located in straight for the
pipeline medium temperature measurement,

but in the tank it can be only located at side of the tank
at perpendicular or 45 degree position (not straight),

if it is quiet perpendicular mean it can measure only when
the liquid reaches the probe level,

the 45 degree location helps to measure for the wide level
of the liquid in the tank.

Question { 5354 }

why flow transmitter showing 2.2ma?

Answer

If there is zero error, the output will be minimum peak of
3.1 mA. If it like 2.2mA, the transmitter electronics may
be problem. Interchange with good transmitter and check.

Question { Bhel, 12419 }

WHAT IS THE DIFFERENCE B/W PLC and DCS

Answer

So many difference are there in that.
But the main difference is,

Many PLCs can be controlled through one DCS, but DCS cannot
be controlled by PLC. For the large plant DCS is the best
than PLC.

Question { Biocon, 7970 }

how to measure level under ground tank ? which type of
transmitter very accuracy ?

Answer

To measure the ground level tank (sump level), the RADAR
level transmitter is the best.

The ULTRASONIC level transmitters also can be used.

At low cost the PURGE TYPE LEVEL MEASUREMENT can be done
for the liquid/slurry level measure.

Question { 4976 }

What is T4 temperature in compressor?

Answer

T4 temperature is the point where the temperature is
measured in the turbine at 4th position.

1. Ambient temperature (Outside enclosure)
2. Gas generator inlet temperature
3. GG air outlet temp (Where P2 measures)
4. HP to LP (PT) turbine temp (After fired)

This is used to measure the temp of hot gas passes out from
the HP turbine, which has left side 4 probes & right side 4
probes.

It trips the compressor (Turbine) when there is 120deg c
difference between left & right avg.

It trips comp when avg temp goes more than 740 deg c (due
to air-fuel ratio).

These informations are partically observed from MAN TURBO
THM 1304 gas turbine.