Guest bazzi Posted September 11, 2016 Report Share Posted September 11, 2016 I am wondering about how the internal settings of the pid works. We have a process that needs to bee kept as close as possible to 85°C with a maximum og 90° and minimum of 80° this is a steam tupe heater which has an internal pipe with some fluid pumped through. The steam and the fluid enters at the same end and at the other end we have our temperature sensor that gives us the process value the steam is controlled by a valve controlled by 4-20 mA. The process fluctuates around 8° wich is considered to much. there are some other variables that affect this process which is best described as the temperature drops by a few degrees with some minutes a part. I am adding a new window where I can set the high and low value of the pid output range . So hopefully that will minimise the fluctuation a bit. But I keep thinking about the Input range. (process value low limit and high limit) I have these values set as 0 for the low limit and 1000 for the high limit = 0-100°C same as the range of the pt100. Should I rather set these values as the lowest value and highest value that we want. 800-900 (80° - 90°) I would really appreciate some help here. Best regards Bæring Quote Link to comment Share on other sites More sharing options...
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