Question { 14813 }

Thermocouple is a transducer but rtd is not transducer why?
Both taking heat as a input and giving mv

Answer

A transducer converts energy from one form to another
form.Thermocouple (itself) converts heat energy into
electrical energy. But RTD needs an external source to give
electrical output.so, RTD could not be considered as a
transducer.

Question { TATA, 7024 }

how pressure reduce through pressure control valve? suppose
we have to reduce 20 kg pressure to 10 kg pressure , then
what we do ? open the valve or close the valve , initially
it is 20 % is upon ( for ur knowledge ).

Answer

First, know where the valve is.If it is at upstream,(High
pressure line to vessel), then close valve and open vent
valve till pressure reduces to 10 kg. If it is at
Downstream,open the valve.

Question { 5470 }

how do i calibrate mmwc pressure guage with out
calibrator.if any? pls give me the ans.

Answer

You need one water manometer,one T fitting and one flexible
rubber hose. Connect the hose,the manometer and the pressure
gauge to the T fitting without any leakage.
Blow air (by mouth)through hose till span (cross check at
water manometer) and fold the rubber hose. Adjust span setting.
Then drop the pressure by unfolding the hose and adjust for
zero.
Repeat process two or three times.
Now check for mid-range, if it is ok, then calibration is over.

Question { Samsung, 4791 }

I am a instrument technician. recently i attend interview and face one of question for DP transmitter ,the client asking about the calibration of DP transmitter ,am answer the calibration procedure, they will ask one more question. why open LP side in atmosphere? i did not answer that question. so please help me and explain the particular question. Dear firends waiting for your valuable replay

Answer

The pressure in the open tank is Atmospheric pressure only. so no need to compensate the pressure at LP side. Just leave it (LP Side)to atmosphere.