Multiple optical sensors measure the combination of light absorbed and scattered by oil droplets in the sample stream. The sensor signals are read by a microprocessor which uses sophisticated algorithms to determine the concentration of oil and solids in the stream.

The oil concentration is displayed on an alphanumeric display. A microprocessor drives a 4-20 mA current loop output which represents the concentration of oil. Two volt-free alarms are activated when the oil concentration exceeds the set points.

An autoclean system is included to ensure that the accuracy of the optical measuring system is maintained over extended periods of operation.

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