Which is the correct position for a controller?

In other words, it makes no differernce if the controller action is direct or reverse, the valve failure position is that which makes the process safe when air supply (or other energy supply) fails. For example, in case of a cooling system, safety is served by the valve failing open.

Why do you not use a positioner on flow control?

You mentioned that you don’t like to use positioners on flow control because the positioners can be slower than the process flow. When I don’t use a positioner and just use an I/P converter, the I/P is much slower acting than a positioner in terms of how the two devices function on a spring-and-diaphragm (S&D) actuator.

How does the positioner work on an IP controller?

Fail-safe position prevails. Then the positioner and DCS are configured, so what the operator sees with the process and the effect of the final control element matches what is happening in the field. A: A traditional IP controller sends position instructions to the valve as to what to do.

How is the action of a controller determined?

My understanding is that the controller action should be decided based on the control valve failure position, plus the process requirements, while the control valve failure action position is decided independently, considering only the safety requirements. I am still skeptical about the controller action. Can you please review my paper and help me?

What does it mean to eliminate a position?

Position eliminations and reductions in force allow an employer to say goodbye to an employee without having to lay out the reasons for the separation on the employee’s door step. It is, after all, easier to say the “business won’t support your continued employment,” than it is to say, “we don’t like your work.”