Dewpoint
Coatings & Industry > Physical properties > Climate
Dewcheck 4
The Climate Gauge for blasting and coating measure :
- Relative Humidity
- Surface Temperature
- Ambient Air Temperature
- Dewpoint Temperature
- Difference between dewpoint and surface temperature
The DewCheck 4 - Dewpoint Meter (DPM)/ Dewmeter is an extremely versatile dewpoint meter to measure and record all climate parameters required to treat surfaces.
This easy to use and robust dewmeter conforms to ISO 8502-4 & ASTM D3276-07 and measures the relative humidity (%RH), ambient temperature (Ta) and surface temperature (Ts) and calculates the dewpoint temperature (Td) and the difference between the dewpoint temperature and the surface temperature (T-delta).
The difference between the surface temperature and dewpoint temperature indicates the optimal climate conditions for painting.
All parameters can be stored in the dewmeter’s memory, tagged with a date and time. Once the measured
The climate gauge for industrial coating
Climatic conditions are of high importance during professional coating jobs.
Climate parameters like ambient air temperature, relative humidity and surface temperature will affect : condensation, drying time, cure behaviour, overcoat time, etc...
Climatic conditions that are out of spec. can cause problem such as : flash rust, poor adhesion, delaminating of coating layers, pores, poor curing, degradation of coating's physical properties, corrosion under the coating and long term performance.
DewPoint
A special, highly important parameter in the coating industry is DewPoint. Wikipedia describes Dewpoint as “ The temperature to which a given parcel of humid air must be cooled, at constant barometric pressure, for water vapour to condense into water. The condensed water is called dew.
The dew point is a saturation temperature.
The dew point is associated with relative humidity. A high relative humidity indicates that the dew point is closer to the current air temperature.
Relative humidity of 100% indicates the dew point is equal to the current temperature and the air is maximally saturated with water.
When the dew point remains constant and temperature increases, relative humidity will decrease.”
All climate parameters has to be measured during each stage of the coating job :
