How does one adjust a control valve positioner? Do any of you technicians have relevant information? There are also amplifiers
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Could someone explain some of the operational details regarding the mechanical zeroing and range setting devices, as well as the amplifiers and pressure relief valves?
Mechanical zero adjustment and range setting are generally done using potentiometers; it is necessary to refer to the manual for details, as adjustments vary depending on the model and manufacturer.
There are two types of positioners available today: electrical positioners and intelligent positioners. For electrical positioners, when the cover is removed, there are usually two knobs inside – one for setting the zero point and the other for setting the range. When the input signal is 4MA, the zero point is adjusted; when it is 20MA, the range is adjusted. This process needs to be repeated several times. As for intelligent positioners, the manual usually indicates that automatic calibration is available, and it only takes one attempt to complete this process
I agree with the person above; mechanical and intelligent are not the same. Just look at what the person above said – no need to say more
I posted a thread on the industrial control forum two years ago, attaching several pictures; I’m sharing them here with everyone. The pictures were taken on the spot by myself; I added some text using a drawing tool, writing it based on my own understanding. If there are any imperfections or inaccuracies, I hope the experts on this forum can point them out so that I can keep learning*. Hehe. . . .