Thanks for your comments Bob
I had to look up a KIM1 (before my time), I hope you still have it,
one sold on ebay for $1500!
I updated the post to include the details about the SSR, I hadn’t
thought of that.
Mine is rated to 480V and 25A. The kiln is 110V & 12.7A. From memory
there the price was relatively insensitive to the A & the V was just
what they were.
I will put together a circuit diagram and send it through, I
shouldn’t be so lazy
Inputiung the code into the arduino is easy, download the arduino
program, install it on your pc, download the kiln ‘sketch’, plug the
arduino in via usb & hit the button that says upload. Edit the code
because you can’t resist and repeat. Simpler than it used to be.