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As with any interlock system, layout your ladder diagram (or logic) , to establish the level of redundancy required. Your photoelectric sensor, can be considered, but you have to sort out how it fails, to avoid over-riding the pre-existing safety interlocks. Ultimately you want a "mansafe"...

River, a hands up for the operator who caught it!

The cell sensor is used in chemical analyzer measurements where the conductance is related to concentration of a chemical component. Clean fluids are required, and occassional lab calibrations and electrode cleaning. Level measurements are for a different purpose. Some devices have used fluid...

Interestingly, for a 4 mm web (0.1575 in), and 3" roller, the encoder wheel sees a 5.25% increase in measured web length when measured opposite the drive roller compared to the encoder on the same side as the drive roller. Given your data of 510 FT and 520 Ft on the one machine with the encoder...

Sounds like a matter of over driving the electrodes, you'll have to reduce the power being delivered.

In operating plants, field grounding of instrument cables is not recommended, due to ground faults that exist in all operating environments, leading to intermittent several hundred volts potential differences between the control room instrument ground and earth ground in the field.

Show us how you ground single loop transmitter wiring.

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.