METHUB Frequently Asked Questions
Yes, the LabVIEW software supports OLE2 communications into another MS-Windows application. You can either pipe data to a file or to another application that is running under Windows 9x/NT/2000/XP.
This of course depends on the nature and amount of contaminants in the gas sample. Meteorological measurements in rural areas have been known to give accurate results for up to a year without cleaning the mirror. Locations near highways with heavy hydrocarbon loads require monthly cleaning. Industrial installations on heat treating/nitriding ovens may require daily cleaning.
You need to supply a flow rate of 0.25 to 1.5 scfh (standard cubic feet per hour). It is generally not affected by changes in flow rate over this range. Higher flow rates constitute a higher heat load on the chilled mirror but ensures faster response to changes in dew point. The lower flow rates are less of a heat load, but are accompanied by somewhat slower response, as it takes longer to flush out the mirror chamber.
4. What pump type should we use for moving a gas sample through a chilled mirror dew point hygrometer?
Just about any small laboratory-type dry diaphragm pump capable of moving a few SCFH of air at atmospheric pressure is adequate. Avoid pumps that use oils as lubricants.
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This page was last updated on Monday, September 11, 2006 .