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Elcometer 309 Delta T Hygrometer

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Elcometer 309 Delta T Hygrometer Climate Monitoring System Inspection Equipment (Elcometer)


Before painting, the coater must meet the coatings’ parameters. These are clearly specified on the paint manufacturer’s product data sheet.

Relative Humidity (RH) and Delta T (TΔ) are the two climatic values which are specified on data sheets.

The Elcometer 309 Delta T Hygrometer provides a simple and fast measurement of these two critical characteristics.

  • Delta T (TΔ): The difference between the surface temperature (Ts) and the dewpoint temperature (Td). When TΔ is less than 3ºC (5ºF) painting should not occur.
  • Relative Humidity (RH): This is the amount of water vapour taken up by air. Expressed as a percentage, RH is dependent on the air temperature. Typical maximum RH values specified by paint manufacturers are between 75% and 85%.
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