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Given that s is a complex number, you form the the magnitude and phase, then you plot them.

Water sprays during plant shutdown. Don't use flamable liquids.

All those details are provided by the VFD and motor supplier

Typically with a loop powered transmitter, you usually have a 24 VDC power source in the PLC location that is grounded to the signal ground connection of the mA inputs. The transmitter only controls the mA signal returned to the PLC. Such transmitters also include a current limiting resistor...

that's really a question for the turbine manufacturer, and the firm that wrote to purchase spec.

as long as you have proper air supply pressure and the valve piston actuator has been tested, the limitation must be in the valve stem friction of the valve.

Explosion proof jb's are heavily armored, and if opened regularly, have a finite life span before requiring replacement.

The gradual reading increase has to do with a combination of the insulation response to the voltage (AC or DC) and the line capacitance for DC

What are the controller settings

consult the vendors data to answer your question

Stick with the company design. any "home brew" improvements, will have to be tested, in a variety of tests with different objects, at least 60,000 times.

sounds like cavitation is taking place, but given the date of your query, you've likely sorted out your problem by now.

the analog set position is an input to the valve controller, and typically a positive signal.

detailed valve calculations involve line loss calculations, fluid velocity, line drain requirements, etc. It is not uncommon to use reducers where the controlled flow is much smaller than the line size is capable of supporting. Confirm the maximum flow conditions with the process design staff.

Make a sketch of your control circuit, with make and model of the controller together with intermediate components including transmitter and any pneumatic transducers to drive the valve.

Mr Umairabnasi You might skecht the overall circuit (from input to output) that you are planning.

Check your controller settings

You need to check the sensor, for a start, the transmitters tend to be more reliable if properly installed

Consult you local electrical standards.

And if you love it, its a lot of fun