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snowluck2345

Member Since 25 May 2013
Offline Last Active Mar 26 2017 09:45 PM
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Topics I've Started

Kiln Not Firing To Temperature?

20 March 2017 - 02:53 PM

My small test fire 120V Cress BT911T kiln is not firing to temperature. I have always noticed it fired slowly, but firing to cone 06 it got there eventually.

 

I recently tried firing to cone 5 and I could not get above 1960 degrees fahrenheit, and going from 1900 to 1960 took 5 hours. I'm controlling the kiln using an SSR, reading temperature with a K-type thermocouple through a MAX31855  with a PID controller running on an Rpi with a webserver hosted.

 

My kiln elements are measuring at 8.8 ohms, rather than 8 ohms nominal. I am getting 90% of full power.

 

Would this be enough to prevent a full firing? This seems strange to me.

 

I am considering replacing my elements, seeing if that fixes my issues, I am not sure though. 

 

Does anyone have experience with these 120V kilns?