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Oh, I see what you are doing now.
All hotwires I know of have an internal controller that modulates the POWER to keep the element TEMP constant (as opposed to keeping constant power and measuring element temperature). The signal returned is the power consumption the element has.
If you are putting it in a small pipe like you say and the element actually gets cold, then you are outpacing the range of the sensor.
Perhaps there are hotwires that operate another way?
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