Quote from: mmcp42 on Feb 13, 2013, 09:41 pmas the probe is inside a metal sleeve, there does seem to be some inertia in the measurement now"Dead-time" in PID jargon.
as the probe is inside a metal sleeve, there does seem to be some inertia in the measurement now
QuoteI may well add PID processing - which should stop the overshootNot necessarily. There is a conflict between getting the response you want, the dead-time, and overshoot. If possible, you should first strive to reduce the dead-time as much as possible. That will make working with PID much much easier.
I may well add PID processing - which should stop the overshoot
Probably breaks the budget but could you use a non contact sensor like this pointed at the PCB?
here's the final circuit(went through several iterations to get there - as you do!)and here's the triac heater control
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