PID Corretto

[Dimal]

Re: PID Corretto

Sorry about that Lizzi :-[,

Mal.

[Lizzie]

Re: PID Corretto

no problem, Mal, i know where to find my favourite tech-tag-team when i need assistance

:-*

L

[wrstikoff]

Re: PID Corretto

The air supply from the heatgun is constant and the PID switches the element on/off every few seconds.... with an even longer off period whilst ramping up slowly to second crack. During the off period the element cools quite quickly (almost no thermal mass to stabilize it) and pumps out relatively cool air.... thus cooling the beans directly under the jet of air..... (When the heater cuts back in, the surface of the bean mass is heated to a much higher temperature before the PID registers the increase also)

Java, maybe there are different controllers? The controller I use chops the AC rather than completely on or off, so the heater is never actually off, but sees different currents and therefor the heat output.

[JavaB]

Re: PID Corretto

Java, maybe there are different controllers? The controller I use chops the AC rather than completely on or off, so the heater is never actually off, but sees different currents and therefor the heat output.

Hi wrstikoff,

Yep there are different types - the one you have is a proportional controller which would work very well.

Unfortunately the type I have (which is the only ramp and soak type Ive seen for sale) is only on or off..... it is designed for large ovens which have a huge thermal mass... so it would work quite well in that case.... but not for roasting beans with a heatgun