Answer / vinoth.s

1. 3 POINT CALIBRATION:
Calibration is generally adjusting the output
according to the input ranges.
3 point calibration means calibrating our instruments in 3
ranges- lower, higher and working range
5 POINT CALIBRATION:
in 5 point calibration are very precise calibration
in which we will calibrate our instruments at 5 different
levels to view the response.
0%, 25%, 50% 75%, 100% of the input ranges.

Answer / anand.r biocon limited

1. 3 & 5 point calibration

When calibrating the field instruments or device under test only 3 process reading compared with master instrument for 5 point calibration you should do comparison for 5 process values with master instrument

2. If we use hart communicator to set the LRV & URV of a
smart transmitter, did we calibrate the transmitter? why?

This is not calibration of transmitter we can say this is configuring BASIC parameters to the TX.

3. Make a complet list if meterials needed to properly
connect a pressure gauge to a steam pipe using 1/2 inch
stainless steel tubing. The gauge connections is 1/2 inch
NPT-M and the steam pipe tap has a 1/2 inch female coupling,
compression fittings are use.

By using sypon and 1/2 " nipple you can mount the pressure gauge on steam line if the line is vertical you should have 45 deg angle to the process line to reduce the pressure drop across the instrument.


8.. what are the two most commonly use programming languages
used when we configure a PLC?


Ladder logic
FBD- Functional block diagram

Answer / bhoorzky

In bench calibration,what is the function of a resistor

In control valve there are two type of valve seat we can use metal to metal seat & soft seat.On this valve seat i have following doubt. 1)I have never seen practically the internal assembly of valve so my doubt is that basically weather the seat is soft seat or metal its basic MOC is same as valve body(SS or CS) only in soft seat we are using PTFE ring & place on valve seat & in metal this PTFE ring is not threr am i correct??????? 2)what are the common general rule for using metal to metal seat & soft seat,means its depend on process parameter like liquid,gas, steam & on valve leakage class.

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