Techno Line WS 9420 User guide

INSTRUCTION MANUAL for WS 9420

Digital COMFORT INDEX Thermometer-Hygrometer with Mold Alert and Dew
Point Temperature

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FEATURES

• Extra large LCD display

• Indoor Temperature

• Dew Point Temperature

• Indoor Relative Air Humidity

• Degree C/F Temperature

• Mold alert by LED and Mold Alert icon (at 65%, 70%, 75%)

• Max-Min record of temperature and relative air humidity

• 12-hour graphical history of relative air humidity

• Programmable upper/lower relative air humidity with audible and LED alarm

• Easy-to-read colored comfort index

• Low battery indicator

This digital COMFORT INDEX Thermo-Hygrometer is an ideal measurement device for checking your
room ambient conditions.

HOW DOES AIR HUMIDITY AFFECT YOUR HEALTH AND YOUR HOME

Excess humidity promotes the growth of undesirable organisms in your indoor environment.
Maintaining an inside humidity range of 30 to 50% indoors helps prevent growth of molds, mildew, and
dust mites. Spending time in a moldy indoor environment can wear down a person’s immune system
and resistance to respiratory allergies and related infections. Indoor air that is free from mold and
mildew also smells fresh and inviting.

Excessively dry indoor air can dry out skin and irritate your throat and sinuses, making those areas
more likely to become infected. In arid climates or in the winter when the combustion inside the
furnace dries out indoor air, using a humidifier device increases relative humidity--like the can did--but
much more precisely

Indoor air that is too dry can cause wood to contract and crack, especially thinner wood such as that
used to build guitars and violins. Over longer periods of time, excessively dry air can even crack solid
wood beams or logs plus some types of plaster.

Active heating or ventilation can help achieve a comfortable and healthy living environment.

ABOUT DEW POINT TEMPERATURE

Dew point is a measure of how much water vapor is actually in the air.
The dew point is associated with relative humidity. A high relative humidity indicates that the dew point

temperature is closer to the current air temperature.
For most people, the air feels humid when the dew point is above 15.5°C (60°F) and uncomfortably

hot and sticky when it goes above 21°C (70°F) degrees.

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