INSTRUCTION MANUAL for WS 9420
Digital COMFORT INDEX Thermometer-Hygrometer with Mold Alert and Dew
Point Temperature
P. 1
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.
P. 2
Dew Point °C Dew Point °F Human Perception
Relative Humidity
at 32 °C (90 °F)
>Higher than
26 °C
24 – 26 °C 75 - 80 °F
21 – 24 °C 70 - 74 °F Very humid, quite uncomfortable 52% - 60%
18 – 21 °C 65 - 69 °F
16 – 18 °C 60 - 64 °F
13 – 16 °C 55 - 59 °F Comfortable 38% - 41%
10 – 12 °C 50 - 54 °F Very comfortable 31% - 37%
<10 °C <49 °F A bit dry for some 30%
BATTERY INSTALLATION
1. Slide open the battery cover at the back of your mold alert thermo-hygrometer
2. Insert 2 x AA batteries (alkaline batteries preferred) into the battery compartment by
observing the correct +/- polarity signs inside the battery compartment.
3. Replace the battery cover. The unit is now ready to use.
12-HOUR GRAPHICAL HISTORY OF RELATIVE AIR HUMIDITY
You could easily view the comfort level of your room conditions in accordance with the last 12-hour
relative humidity records.
>Higher than
80 °F
COMFORT LEVEL RELATIVE HUMIDITY
TOO WET 81% to 90%
WET 61% to 80%
COMFORT 41% to 60%
DRY 31% to 40%
TOO DRY 20% to 30%
Severely high. Even bad for asthma
related illnesses
Extremely uncomfortable, fairly
oppressive
Somewhat uncomfortable for most
people at upper edge
OK for most, but all perceive the
humidity at upper edge
65% and higher
62%
44% - 52%
37% - 46%
P. 3
TO USE THE HUMIDITY ALARM
1. To set the humidity alarm, press and hold SET, both
LCD, the humidity digits flash. Press
increment.
2. Press SET once, both
Press
3. Press SET once or wait for around 10 seconds to return to normal display condition.
4. To turn on the humidity alarm, press ON.OFF once.
5. When air humidity exceeds the set limit, both the
6. Press any key to stop the alarm and flashing LED.
7. To turn off the humidity alarm, press ON.OFF once.
disappears on the LCD.
Remark: Alarm and flashing LED duration 1 minute
MOLD ALERT
1. To select the mold alert humidity, press and hold the
appears on the upper LCD and humidity digits flash, press or to select mold alert
humidity value at 65%, 70%, 75%.
2. Press and hold
condition.
3. If air humidity exceeds the mold alert humidity value, there is a risk of mould formation. The
4. Press and key to stop the LED from flashing, remains on the
LCD until the measured air humidity is lower than the preset mold alert value.
Default mold alert humidity: 65%
TO READ DEGREE C/F TEMPERATURE READOUT
Simply press °C/ °F to select degree C or F readout.
or to set the lower humidity limit in every 5% increment.
/ °C/ °F or wait for around 10 seconds to return to normal display
will appear on the LCD, the red LED will flash every 5 seconds.
or to set the upper humidity limit in every 5%
and appears at lower LCD, the humidity digits flash.
or will flash with with flashing LED.
or remains flashing on the LCD.
/ °C/ °F .
and appears at lower
appears on the LCD.
and the or
P. 4
TO READ THE MAXIMUM-MINIMUM TEMPERATURE AND HUMIDITY RECORDS
Press MAX.MIN one at a time to view the maximum or the minimum temperature and relative humidity
since the last reset.
When the maximum temperature and humidity are displayed with
MAX/MIN will clear the maximums and the unit will start to record and display fresh data again.
When the minimum temperature and humidity are displayed with
MAX/MIN will clear the minimums and the unit will start to record and display fresh data again.
TROUBLE SHOOTING
In case your wireless thermometer-clock shows irrelevant information or digits, it maybe affected by
electrostatic discharge or interferences from other devices. Press the RESET. Your unit will be reset to
default setting and you need set humidity alarm and mold alert values again.
PLACING OR HANGING UP THE UNIT
Insert the holder to the bottom your unit for desktop display, insert it onto the rear side of your unit for
hanging on the wall.
Since the humidity levels vary greatly according to the location, mount the unit so that it will monitor
the conditions in a location likely to be subject to the most problems.
CARE OF YOUR COMFORT INDEX TERHMO-HYGROMETER
1. Do not expose the unit to extreme temperature, water or direct sunlight
2. Avoid contact with any corrosive materials
3. Do not subject the unit to excessive force, dust or humidity
4. Do not open the inner back case or tamper with any components of this unit
5. Do not mix new and old batteries
6. Do not mix alkaline, standard (carbon zinc), or rechargeable (nickel cadmium) batteries
7. Your Thermo-Hygrometer is designed for indoor use only. Do not leave it for outdoor usage.
SPECIFICATIONS
Temperature Range 0°C to +50°C
Tolerance +/- 1°C
Relative Humidity Range 20% - 95%
Tolerance +/- 5%
Temperature Resolution 0.1°C
Relative Humidity Resolution 1%
, press and hold the
, press and hold the
P. 5
Words in the figure:
Figure 1: ENGLISH Other Language
FRONT VIEW
MOLD ALERT
12-HOUR GRAPHICAL HISTORY OF
ALERT ICON
RELATIVE HUMIDITY
MAX / MIN ICON
ALERT ON / OFF
RESET
ALERT LED LIGHT
ALERT SET / DEW POINT
TEMPERATURE
DEW POINT
BACK VIEW
INSERT 2 X AA BATTERIES
HOLDER
BATTERY DOOR
Consideration of duty according to the battery law
Old batteries don’t belong to domestic waste because they could cause damages of health and
environment. End-user are committed by law to bring back needed batteries to distributors and other
collecting points.
RELATIVE AIR HUMIDITY
/ MAX / MIN
/ °C/ °F
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