You are right Ken, the roaster is not designed to have the gas input varied during the roast. Maybe I can bypass the gas controller or replace it with one that can adjust the gas input to the burner? Some similar roasters does not have the controller at all but a simpler system with manual regulation of the gas supply from the bottle. I am not sure how the gas/air mix is on those roasters. The problem here in Norway is that gas is not used much in the household, we mainly use electricity for all types of heating/cooking, thus not many has expertice in this area.
Any ideas on how I can approach this challenge will be appreciated Or anyone with a Cafemino or similar that can share some thoughts on how they manage to control the roast profile effectively?

Runaro wrote:You are right Ken, the roaster is not designed to have the gas input varied during the roast. Maybe I can bypass the gas controller or replace it with one that can adjust the gas input to the burner? Some similar roasters does not have the controller at all but a simpler system with manual regulation of the gas supply from the bottle. I am not sure how the gas/air mix is on those roasters. The problem here in Norway is that gas is not used much in the household, we mainly use electricity for all types of heating/cooking, thus not many has expertice in this area.
Any ideas on how I can approach this challenge will be appreciated Or anyone with a Cafemino or similar that can share some thoughts on how they manage to control the roast profile effectively?

You would probably need to change the burner and the gas piping within the roaster, as well as to introduce an easily adjustable valve. This may or may not be possible with the amount of space you have to work with. My sample roaster did not work well at my altitude with the burner that was supplied with it, and we did exactly this as a modification on that roaster before I could efficiently use it. You will need to locate another, suitable burner, and to work with someone who is capable of working with gas piping, such as a creative and competent certified gas appliance repairman.

ken

Myself and a fellow Toper Cafemino Gas owner, Tony from South Africa, recently modified our roasters to increase the ability to control the temperature during roast. So far I am very pleased with the mod, it was fairly inexpencive, easy to implement and in combination with the Artisan roasting software it gives me total control of the roast profile . The mod consist of a needle valve and a low pressure manometer installed between the Honeywell gas regulator and the burner (see picture). The gas regulator input is 30 mbar and with the needle valve I am able to control the gas pressure to the burner from max and down to 2 mbar. The flame is burning with a nice blue flame at any settings and so far there is no soot on the drum so I believe the combustion is OK. I have always found it difficult to control the temperature profile with the air valve, now I mainly keep it at a constant setting during roast to eliminate chaff and smoke. The needle valve control is very responsive and easy to use. I can recommend this mod to all Cafemino roasters.

Now you're taking!!!

I have installed PWM SSR on my electric Cafemino. Essentially, yours will do the same as mine but better and faster!!

Nice job!