Answer / binu

Connect the input air suply of around 5 to 7 Barg. Feed 4
mA through the calibrator, the output aire pressure gauge
shal indicate 3 psi. Feed 20mA through the calibrator, the
output air pressure gauge shall indicate 15 psi.

Answer / guest

hi sanjay
1. AIR SUPPLY
I/P input - 1.4kg/cm2
Out put - 0.2 to 1kg/cm2 ok

2.input signal= 4-20 mA

i.connect the air supply to input with the hepl of REGULATOR i.e 1.4kg/cm2
ii.connect the MASTER GAUGE to OUT PUT ok

Apply the signal

i. 4mA- 0 kg/cm2 (if not Zero/0.2kg/cm2 Adjust Zero adjustment Screw)
ii. 20mA-1 kg/Cm2 (if not 1kg/cm2 Adjust Span adjustment Screw) ok.

then 8, 12, 16mA.
min. and max. is ok the remaining will perfect automatically i.e 8,12,16mA.

and MAIN IMP POINT is ON the I/P's Ckt board Side 4 adjust ment buttons is there and adjust that buttons Direct and Revese Actions ok

Answer / asif javaid

FIRST SEE ITS PRESSURE RANGE APPLY INPUT PRESSUR 5PSI
MORE THEN MAXIMUM RANGE OF OUTPUT PRESSURE AND SEE ITS OUT
PUT THEN APPLY 4MA AND SEE OUTPUT SIGNAL 3 PSI NOW ADJUST
3 PSI FROM ZERO ADJUSTMENT SCREW NOW 8 12 16 &
20MAAPLY AND CHECK MAX PRESSURE RANGE NOW ADJUST FROM SPAN
SCREW

( RANGE CAN BE DIFFERENT FROM 3 TO 15 PSI )

Answer / haridass

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."

Answer / charlie daubitz

There can be a jumpper on the I-p converter to set the
range. There are more accepted ranges than only 3-15 psi.

Answer / binu

Dear Sanjay,

Hope you are adjusting 4mA with "Zero" screw and 20mA
with "Span/range" screw. I feel that you might have
adjusted the 3 psi with range screw.

Answer / sanjaymaven

i follow your above procedure
i use 0-30 psi pressure gauge
when i feed 4 mA gauge show 3 psi, gradually i increase mA
, simontaneously pressure increase.At 10 mA gauge shows maxm
20 psi. i little adjust the range screw but nochange on
gauge. now what will i do .please sujest

Why we are using 4-20 mA as Analog signal transmission other than 3 to 19 or 2 to 18 or 6 to 22 like wise ? What is the reason behind using 4 & 20 mA? Can anyone give proper technical reply ?

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