Wiped Film Parameters

[cyclopath]

@Beaker

“Thermocouple” is a shortened name for thermocouple pair. They are just two wires twisted together. So long as the two wires are not the same metal they form a thermocouple pair. When the metal in the wires is known a circuit can measure it and amplify it because it produces a voltage in relationship to the heat at the metal junction.

Wiring two or more thermocouple pairs in parallel will produce two or more voltages, one at each thermocouple junction. In parallel the voltages will average each other. Low on one and high on another results in a voltage midway between all thermocouple pairs wired together this way and the control will see then the average of all as one voltage input.

Adding resistors costs likely fifty cents lolz but is necessary and is outside the scope of this blog to explain why but it is because each thermocouple pair is a slightly different length and the calibration circuit cannot deal with this with accuracy unless matched with swamping resistors this way. You can look it up…

The controller only sees one input like this but it is averaged. If you had ten thermocouple pairs wired in parallel this way it would average all ten together as an example of how far you could go with the design idea. I am just wiring a new idea together using this well known technique for high precision thermal control in my own SOP.

I’m now gonna have to learn of swamping resistors so the PID controlling the heat tape on our new wiper can use average temps.

@NitroCat … don’t neglect the links under the top post.