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The Optidew high performance optical dew-point transmitter is based on the proven, fundamental optical dew- point measurement principle, giving long-term unmatched drift-free performance. It offers a wide measurement range from the equivalent of <0.5 to 100% RH at ambient temperatures from -40 to +190°F. Optidew provides two linear 4-20 mA outputs and RS-232 serial communications, allowing configuration and monitoring by a suitable computer or PLC system or via specific Optidew logging software. An adjustable isolated alarm contact allows Optidew to be used for direct process control. An optional high definition alphanumeric display provides local indication of the measured moisture and temperature values.