Vaisala DEWCAP DM500 Guia do Utilizador descarregar pdf (Página 135)

Appendix A __________________________________________________________ Humidity Theory

VAISALA ______________________________________________________________________ 133

Response Time – The response time of a hygrometer is proportional

to the amount of water vapor in the gas being measured. Thus, at

dewpoint temperatures of –60°C, things take ten times longer than at –

40° because there is ten times less water vapor.

Condensation - It is important to remember that condensation will

form on any surface if the temperature of that surface is at or below

the dewpoint temperature of gas that is in contact with the surface. In

practice, condensation may form in sample lines or on interior or

exterior parts of the hygrometer. Condensation inside the sample line

will cause a measurement error.

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Vaisala DEWCAP DM500 Guia do Utilizador Página 135