Firing Two Phases in One Uninterrupted Session

Yes, this means you can start firing before you go to bed at night, and in the morning the second phase will be over.

This not only makes the firing process simpler; it also makes 2-day workshops feasible.

Why didn’t I think of this before? I don’t know. Why didn’t kiln manufacturers tell us that? I only thought of it because I got an email from a customer whose workshop is far from her house and it’s a hassle for her to go there a second time to start the second phase. So thank you for asking me this question – you know who you are!

In this PDF file you will find instructions for programing the kiln to fire 2 phases in one firing session. The instructions are both for the Sentry Xpress controller and for the Bartlett controller. Choose the instructions that apply to your controller.

Here is a short explanation:

You program the kiln to fire the first phase.
After doing this, the kiln will ask “rA2”, which means “At what speed would you like me to ramp the second time around?” Usually we say 0:00, which makes the kiln stop asking questions and start firing.
This time we say “Full,” and the kiln will keep asking questions. Next question is “At what temperature would you like me to fire the second time around?” Say 100ºF/50ºC.

The kiln will then ask: “How long would you like me to hold the second time around?” Say 0:00. No hold.
What we just did is tell the kiln to cool to 100ºF/50ºC.

The kiln will then ask: “At what speed would you like me to ramp the third time around?” We say Full or 1400ºF, depending on the kiln.
The kiln will ask: “At what temperature would you like me to fire the third time around?” We tell it our temperature for mid-fire schedule.

We just told the kiln to start phase 2 after it has reached 100ºF/50ºC. You entered 3 consecutive programs.

It will ask you: “At what speed would you like me to ramp the fourth time around?” Now you say 0:00 to shut it up.

Bartlett controllers work a little differently. They ask you at the outset how many programs you want to enter by the question “SEG” (number of segments). You tell it 3, and it won’t ask you for the fourth time around.

We can’t make the kiln cool faster than it would naturally do; we can only make it cool slower (which is important in the case of glass), but this is not what we want. If you are not firing overnight, you can open the kiln to cool it faster. Just don’t forget to close it when it starts phase 2.


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