I managed to find out. The low and high enginnering is the desired reading i want. So i should put 0 for low and 100 for high. With respect to the 4ma-20ma. After which, i need to see without pressure. What is the reading. Theortically, it should show o psi. If it show 3 psi. Then it show the transducer is a bit out or offset. In which, i key in 3 to the sensor offset. Am i right? then what is the purpose of doing the calibration?
If you are reading 3 psi when no pressure is applied to the transducer, then the
transducer needs calibrating, I would have severe doubts that it was the Analog Input module.
3psi in a 50psi range transducer is a very large error, are we sure this transducer is actually scaled 0-50 psi ?
Is it a new transducer ?
If not, then it could be defective, could it have been damaged, has it been massively over-pressurised at some point in it's working life.
Applying a "Sensor Offset", IMHO, is only a temporary, get-you-going solution. You should either get the transducer bench-tested and calibrated ASAP, or swap it out for a new one.
You mentioned "calibration" - are you referring to the calibration of the analog input module?
You should
NEVER perform calibration of an input module using your field devices as the calibration input, but should use
precision voltage/current sources.
At least one thing in the measurement process has to be relied on.
In my experience, I have never heard of anyone who needed to "re-calibrate" a Logix5000 analog module, but the calibration procedure can be used for certification purposes in regulated industries.