ninad gaikwad


{ City } khopoli
< Country > india
* Profession *
User No # 91533
Total Questions Posted # 3
Total Answers Posted # 2

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Questions / { ninad gaikwad }
Questions Answers Category Views Company eMail

how the actually positioner of control valve working? where we gave 3-15psi pressure to I/P converter where it is firstly applied ?- on I/P to positioner then what happen? is control valve operate on 3-15 psi or its bench pressure?

2 Instrumentation 5480

How to check vortex flow meter is in good condition while we do not having calibration setup?

4 Instrumentation 7451

what is absolute pressure, gauge pressure and atmospheric pressure?

Mother Dairy,

2 Instrumentation 6319




Answers / { ninad gaikwad }

Question { 11538 }

How to check range of DP Transmitter


Answer

The best part of answer is already mentioned in
above i.e DATASHEET as well as HART communicator.

If you want to use DP Tx for level of tank then
range of DP Tx will be get From C-C distance of tank from
tapping, by using simple formula i.e: (height * density=
range). It means you will get range of DP transmitter for
level.
If you want to get the range for Flow. in that
case please check the orifice plate which is already
installed in line, you will get the range.

Is This Answer Correct ?    1 Yes 0 No

Question { Invensys, 7904 }

why we use only 4 to 20ma other than 0 to 16 ma


Answer

Please give you attention below:

4 mA 0 %
8 mA 25 %
12 mA 50 %
16 mA 75 %
20 mA 100 %

at the time of no voltage (zero voltage) we get 0 mA
at the time of 24v dc supply we get 4 mA.
IF we keep the range starting from 0 mA we will get 0 mA at
the time of zero voltage & 24 V dc voltage supply which is
technically not good.
If your observation is too good that time you will
find that from above every gap between each other of 'mA'
& '%' the differrences are equally same.
see for mA : 0-4-8-12-16-20 (gap of 4 mA equally)
and see for % : 0-25-50-75-100 (gap of 25 % equally)
This things easily helpful to sort out the problems.

Therfore this STANDARDISATION is Universal.

Is This Answer Correct ?    2 Yes 1 No