Temperature Control


Thread Starter


I'm learning about the Refrigeration system for Cold Room or others, but I don't know how to make the ladder for convert the pressurevalue to temperature . If anyone have the example of ladder about this Could you please sugguest me.

Piotr Kowalski

What you need to do is:
1. Determine kind of cooling agent in your installation (ammonia, Rxxx freon, etc.)
2. Find chart or table with physical properties of the agent.
3. Put P, P(T) (preassure, temperature) values into a spreadsheet.
4. Find a function (approximate) describing the values from chart.
5. Now you can put the function into your ladder program, exact implementation depends on type of your PLC.

Piotr Kowalski