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Michell Instruments has produced a humidity calculation slide chart, which is targeted at anyone working with processes involving moisture control or analysis.

Updated to include new measurement parameters, the slide chart facilitates calculations and conversions between units of moisture content in parts per million (ppm), dew point, relative humidity and moisture in liquid.

The slide chart offers a selection of humidity units.

High and low humidity ranges are covered on separate sides of the calculator, enabling the greatest range of conditions to be covered.

One side is for making calculations with extremely dry gases containing only parts-per-billion (ppb) moisture content; this side is mostly of relevance to sectors such as the semiconductor industry.

The other side is suitable for calculations involving very high concentrations of water vapour, such as those found in paper production and certain metallurgical processes.

Parameters on the slide chart include: relative humidity; absolute humidity (g/m3); mixing ratio (g/kg); moisture content (ppmV) in gases; moisture content (ppmW) in liquids; and dew point (degrees Celsius) and vapour pressure.

Pressure and temperature compensation is incorporated, where relevant, for each unit conversion.

Metric/imperial conversions are provided for temperature and pressure.

Michell is giving away versions of the slide chart for free to customers enquiring about moisture applications and requirements.

Michell Instruments

Michell Instruments is an international leader in high-precision sensing with over 35 years’ experience in the field, specialising in instrumentation for dew point, relative humidity and oxygen analysis. The company serves industries as diverse as petrochemical and pharmaceutical to power generation and food processing. The product range includes:

  • High-precision ceramic moisture sensors to measure trace moisture in process applications.
  • Relative humidity transmitters and sensors for use in HVAC applications, pharmaceutical storage and other production processes where controlled environmental conditions are crucial.
  • Humidity calibration systems and reference dew-point hygrometers enable customers to carry out the calibration of portable hygrometers and relative humidity instruments in-house, saving on downtime and costs.
  • Zirconia and thermo-paramagetic oxygen analysers for combustion optimisation, maintaining gas purity, controlling levels of CO2 in breweries and many other applications.
  • Condumax II Hydrocarbon dew point analysers ensure the quality of natural gas at custody transfer, prevent gas burner failure and the prolong the life of process equipment, helping companies save millions of dollars on repairs and downtime.
  • Trace moisture in hydrocarbon liquids analysers are available in explosion-proof and instrinsically safe versions and allow the continuous measurement of moisture content in a wide range of applications from transformer oil, petrochemical factions and pure hydrocarbons.
  • Process moisture analysers provide continuous on-line measurements of trace moisture in process gases and are available as explosion-proof, instrinsically safe and laboratory versions.

Michell Instruments has three manufacturing locations: Oosterhout, The Netherlands; Lyon, France and Ely, UK. The company has an extensive network of factory-trained application engineers, subsidiaries and distributors stretching across 56 countries.

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