When I worked for AGM Glass Machinery, they were considering representing a company that made glass tempering ovens. I was onsite during the start-up and commissioning to learn the system, with the intention of being able to provide local support.
The oven and the engineer were from Finland. The engineer went to great lengths to explain to me how the control program used a recipe to cycle different heating elements on and off in order to heat the glass evenly over a period of time, starting at 70F.
I was also reading and making copies of the operating manuals and parts manuals for reference. One thing I noticed was that the pyrometer had a sensing range from 90C up to a temperature that I don't remember.
I was puzzled, wondering how the controller could run through the portion of the recipe from 70F to about 200F, when it couldn't see any temperature below about 200F.
The next day I told the engineer about the sensing range of the pyrometer, and I asked him how the control program used the portion of the recipe from 70F to 200F. He didn't answer. And he actually did not talk to me for the next two days.
This entry was submitted by Glenn Aitchison and edited by Rob Spiegel.
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