134. If an oil-in-water content monitor uses a lamp emitting light in the visible spectra in conjunction with a reference photocell and a sampling photocell, what is the operating principle upon which this oil-in-water content monitor works?

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the monitor works on the absorption/scattering principle where the greater the oil content, the less the amount of visible light detected by the sampling photoelectric cell as compared to the reference photoelectric cell.

134. If an oil-in-water content monitor uses a lamp emitting light in the visible spectra in conjunction with a reference photocell and a sampling photocell, what is the operating principle upon which this oil-in-water content monitor works?

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