[farr]

Hi,

The data sampling is limited by the pressure analyzer output time delay. It only analyze the sample every 15-20 min. The results are not like a pressure transmitter, they differ from one reading to another.

All of the data is taken when the master loop (pressure) is in manual and flow loop (slave in cascade). You can see as the pressure loop output (0-5%) increases the pressure loop pv (kpa) increases as well.

The goal here is not to be exactly at the pressure setpoint but to be near it. Under these conditions can a 1st order response be trusted from PID tuner?

 

[farr]

I think i got the time correctly converted in excel. Here is the project link.

PV is pressure in kpa 0-105 kpa

output is 0-5% range

two operating ranges for pressure. either 89-92 kpa or 99-101 kpa

https://pidtuner.com/#/wFvcVzelhf

[farr]

Thanks. I have a very slow process. (PV updates every 15-18 min). I have the open loop test data for around 20 hours. How would you recommend entering that data? and interpreting its results

 

[farr]

Hi, can you explain how to use the time column? should my time unit be in seconds ? minutes ? and what should be the format of time. if you can give an example that would be great. thanks

[Author]

Posts