ML8511 Sensor, unable to achieve meaningful results. Output voltages are atypical
I found another, third sensor identical to mine and functioning properly.  By measuring pin output, then cross swapping with one of my two "supposedly abberant" sensors, I have identified my two as being defective, i.e., the other sketch then failed to function properly with one of those so identified sensors, whilst mine now worked as it should.

I typically buy at least two of everything in an effort to isolate such problems, but if from the same batch, two may not be sufficient in some situations.