CDP301 hydrocarbon and water dewpoint tester

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Michell Instruments’ CDP301 hydrocarbon and water dewpoint tester is a portable, manual-visual dewpoint instrument.

The product uses the chilled mirror technique for accurate measurements of both hydrocarbon and water dewpoint.

It is ATEX, IECEx and cQPSus compliant for use in a Zone 1 or 2 Hazardous Area and Class I, Div 1 Hazardous Locations, allowing it to be positioned close to the process sample test point.

Unlike older visual-manual dewpoint testers, which rely on the operator making observations through a microscope, the CDP301 includes a full-colour interface which shows a magnified view of the mirror surface.

It is this optimised display — together with specific illumination techniques — that makes it possible to measure either water or hydrocarbon dewpoint and log the results. Visible red-spectrum laser light clearly illuminates fine water droplets and ice crystals when targeting water dewpoint. Broader spectrum white light enables the iridescent film synonymous with HC condensate to be detected with a high sensitivity of up to 5 mg/Nm³.

Once the user has observed a layer of condensation form on the mirror surface, the temperature, pressure and dewpoint are recorded at the push of a button. The video footage and/or still images, along with corresponding data, for multiple measurement cycles is logged for later review either on the instrument’s display or on a PC.

The dewpoint tester meets the requirements of ASTM D1142 (standard test method for water vapour content of gaseous fuels by measurement of dewpoint temperature) and ISO6327 (determination of natural gas dewpoint using the cooled surface condensations method).

The CDP301 weighs 8 kg and its rechargeable battery allows up to 8 h of use.