Ratio control: [Essay Example], 345 words GradesFixer

Haven't found the right essay?

Get an expert to write your essay!


Professional writers and researchers


Sources and citation are provided


3 hour delivery

This essay has been submitted by a student. This is not an example of the work written by professional essay writers.

Ratio control

Print Download now

Pssst… we can write an original essay just for you.

Any subject. Any type of essay.

We’ll even meet a 3-hour deadline.

Get your price

121 writers online

Download PDF

Ratio control is used to maintain the flow rate of one stream with relation to another. Two feed streams can be combined together, creating a mixed flow and this flow usually has physical properties or desired compositions. The flowrate of one of the streams feeding the mix flow can change freely. As this is the case, many factors can affect the flowrate, such as feedstock variations, the action of another controller in the plant, product demand etc. On the other hand, this may be the stream that has to kept the same during normal operation.

The second stream is the one that feeds the mix flow (controller feed). There is also a final control element (FCE) in the controller feed stream which receives and reacts to the signal given from the output of the controller, within the ratio control. Compressors and speed pumps can also be contained within a ratio control. The freely flowing stream sends a signal to a relay which can be one of two types, ratio relay or multiplying relay. A ratio relay is not usually available to operators and is only entered into the mix once. A multiplying relay is the opposite as it can be adjusted and is accessible to be changed.

Ratio control requires for a received signal to change linearly with the flow rate. Hence, the signals within the freely flowing stream should increase and decrease in a straight line manner. Any non-linear signals can be converted to linear signals by adding a function block between sensors and ratio relays. A flow fraction controller is the mixing of an additive into a process stream. This functions similarly to a delay but differs by using the additive to vary the mixed product flow over time. Having a flow fraction controller over a relay means there is more control over how much of the additive enters the stream and does not require high levels of permission as does a normal relay controller. A ratio controller can also be included within the larger cascade architecture and is known as the multiplying relay.

Remember: This is just a sample from a fellow student.

Your time is important. Let us write you an essay from scratch

100% plagiarism free

Sources and citations are provided

Cite this Essay

To export a reference to this article please select a referencing style below:

GradesFixer. (2019, February, 27) Ratio control. Retrived February 20, 2020, from https://gradesfixer.com/free-essay-examples/ratio-control/
"Ratio control." GradesFixer, 27 Feb. 2019, https://gradesfixer.com/free-essay-examples/ratio-control/. Accessed 20 February 2020.
GradesFixer. 2019. Ratio control., viewed 20 February 2020, <https://gradesfixer.com/free-essay-examples/ratio-control/>
GradesFixer. Ratio control. [Internet]. February 2019. [Accessed February 20, 2020]. Available from: https://gradesfixer.com/free-essay-examples/ratio-control/

Sorry, copying is not allowed on our website. If you’d like this or any other sample, we’ll happily email it to you.

By clicking “Send”, you agree to our Terms of service and Privacy statement. We will occasionally send you account related emails.



Your essay sample has been sent.

Want us to write one just for you? We can custom edit this essay into an original, 100% plagiarism free essay.

thanks-icon Order now

Hi there!

Are you interested in getting a customized paper?

Check it out!
Having trouble finding the perfect essay? We’ve got you covered. Hire a writer

GradesFixer.com uses cookies. By continuing we’ll assume you board with our cookie policy.