Answer / todd

You connect it to a vacuum pump with a calibrated absolute
pressure gauge (electronic or mechanical). compare the two
readings. adjust as needed. Normal output is 4-20. 4 being a
perfect vacuum . 20 ma being the upper end of your range .

Answer / ravi vaya

Absolute presure is atmospheric pressure + gauge pressure
So,while calibrating Transmeter must add atmospheric
pressure in given presuure .

Answer / fermin

I have a Pressure Transmitter Fieldbus Type (FF) with the range of 0 to 1000 mmHg_0C Absolute according to the data sheet,it is correct? that 0 to 100 mmHg is a absolute pressure?
And how to calibrate if it is absolute.

Answer / khan channar

Why absolute pressure gives the value while not in process? anybody knows about it then please share with me thanks.....

Answer / amresh dhiman

First connect 24 dc supply to the absolute Pr transmitter
it will show 20 ma as its working against atmospheric pressure i.e. against 760 mm of Hg
after this you apply a vacuum pressure of 760 mm Hg & connect multi meter in series, you will find 4 ma ,In DCS you have to scaling like that 20 mA = 0mm ,& 4 mA = 760MM
I think this is the best procedure

Answer / nadeem iqbal

Absolute pressure transmitter never give 4 MA while calibration .bcoz when u will apply vacuum pressure almost 4.9ma will come but exact 4 not possible ,if any body can do this let me know and tell the procedure ,i shall be grateful that person,

Answer / hitendra

procedure of absolute pressure transmitter:-

power supply:- I/P 24v dc to transmitter

multimitter connect with transmitter in series position
now when transmitter in atmospheric,transmitter o/p is 20ma
when applied 0.8to0.9kg transmitter o/p is 4ma

i have done DAE in Instrumentation and Process Control. i have applied for an apprentice training in chemical company after three day my interview will be conduct but i need more information about industrial process control and controller. my e mail is imran_dilsetu@yahoo.com please tell me interview question relative to instrumentation ?

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