Oregon Scientific AR112C User manual

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AIRQUALITYMONITOR
MODEL NO.: AR112C
USER’S MANUAL
SECTION 1 INTRODUCTION
Congratulations on your purchasing the AR112C Air Quality
Monitor.
The AR112C is an indispensable household appliance for better
living. It helps improve your life quality and health by providing
significant information on the concentration of harmful VOC
(volatile organic compounds) gases in the environment. In addition
to warning you against bad air quality, it also keeps you constantly
informed of the indoor temperature and humidity.
ABOUT VOC GASES
VOC gases are invisible to the human eye. They are chemical
compounds very often found in building materials, household
detergents and bleaches, cigarettes, material additives and adhesives
and the like. Here is a brief look at the most common sources of
household VOC gases:
MAJOR HOUSEHOLD EXAMPLES
SOURCES
Building Materials Insulating materials, vinyl or plastic wall
coverings,construction adhesives, plastic
piping and gypsum boards
Cleansers Aerosol bathroom cleansers, window
cleansers, oven cleansers, abrasive
cleansers, dishwashing detergents,
spot removers and room deodorants
Paints Oil, urethane and acrylic paints, varnishes,
paint thinners and removers
Adhesives Rubber cement and adhesives, floor tile
adhesives, ceramic adhesives and carpet
adhesives
Cosmetics Deodorants, talc, rubbing alcohol and hair
sprays
Pesticides Roach, flea and rat killers, mold and mildew
inhibitors, plant insecticides, moth repellents
and fungicides
Appliances Heaters, gas cooking stoves, wood-burning
stoves and fireplaces
Others Tobacco and cigarette smokes, vehicular
exhaust, upholstery, draperies and
carpets

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POTENTIALHEALTHHARZARDS
These gases cause pollution to the environment and when breathed
in high concentrations over a long period of time, may cause harm
to the human body. Here are some of the potential health hazards
caused by common VOC gases:
Sources VOC Gases Affected Organs
Vinyl tiles Benzyl chloride Central nervous system,
liver, kidney, eye and
respiratory tract
Paints, solvents, Benzene and styrene Respiratory tract
resins and (carcinogens)
cigarette smokes
Paint removers, Dichloromethane Central nervous system,
deodorizers and and 1,4- liver, kidney, eye and
moth crystals Dichlorobenzene respiratory tract
(both narcotic)
Polyurethane foam Trichloroethene and Central nervous system
aerosols, solvents toluene diisocyanate
and cleansing (carcinogens)
compounds
Adhesives, vinyl Toluene (narcotic) Central nervous system
floor covering,
wallpaper, tobacco
smokes, kerosene
heaters
Pesticides, varnishes Xylenes (narcotic) Central nervous system,
and pharmaceuticals heart, liver and kidney
SOLUTIONS
As VOC gases are not particles that can be filtered by a household
air filter, the best ways to guard against such harmful VOC gases are
adequate supply of fresh air, constant ventilation and a good air
quality monitor to alert you to the existence of such gases.
BEFOREYOUBEGIN
- Please read carefully before you start to use this unit.
- This unit alerts you to the quality of air you are breathing in. It
does not necessarily reflect the concentration of a particular type
of VOC gases.
- This unit is designed to response to a wide range of VOC gases.
When the [ ] is activated, it does not necessarily mean you are
in immediate bodily danger. It means the room needs immediate
ventilation.
- Always read the instructions of chemicals, materials and appli-
ances used in the household careful. They may contain important
information on the possible danger or health hazards they may
affect when abused.
PRECAUTIONS
Safety warnings, precautions or rules are embedded throughout the
manual to help you use this product safely. Take heed of the advice
to avoid injuries, fire, electrocution, damage or other accidents.
Ignoring this may result in serious injuries or worse accidents.

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·Use adaptor other than AC 100V may cause fire on electric
shock.
·Do not subject the internal components to water or foreign
objects.
·Do not install the unit in bathrooms or places exposed to rain
or excessive humidity.
·Do not drop the product onto the ground or subject it to
excessive shock to avoid damage.
·Do not change the specifications of the provided power cord or
damage it. And avoid placing furniture or heavy objects on
top of the power cord.
·Do not overload the power source. Use an unoccupied wall
socket.
·Do not pull by the cord when disconnecting the unit from the
power socket.
·Donottouchthepowersocketorpowercordwithwethands.
·Avoid placing the power cord too close to heat sources that
may cause damage to the protective layer.
·Discontinue use when the power contact is loose or when
the power cord radiates heat.
·Do not cover the unit with cloths, blankets or similar objects that
mayblockthedissipationofheatgeneratedinnormaloperation.
·Donot install theunit near cookingutensils, humidifiers, heaters
or places subject to excessive or direct heat, cold or dust.
·Do not tamper with the unit´s internal components.
·Disconnect the unit from the wall socket when the internal
components are in contact with water or foreign objects.
·Discontinue use when the internal wires of the power cord
are exposed.
·Disconnect the unit from the power socket in times of thunder.
·Discontinue use when the unit or the power socket is damaged.
·Disconnect the unit from the power socket when the unit
malfunctions or smoke or smell radiates from the unit.
SECTION 2 PRODUCT FEATURES AND
OPERATION
PRODUCTFEATURES
Generally
prohibited
Do not
disassemble
Important
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RESET ALARM
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'AA' UM-3 1.5V
'AA' UM-3 1.5V
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A. MODEBUTTON
Changes the display interval for the air quality bar graph
B. [ ] BUTTON
Adjusts the sensitivity level of the unit
C. LIGHT BUTTON
Turns on the backlight for 20 seconds
D. [ ] BUTTON
Changes between the current and minimum temperature and
humidity in memory
E. [ ] BUTTON
Changes between the current and maximum temperature and
humidity in memory
F. LEVELADJINDICATOR
Indicates the sensitivity level of the unit
G. AIR QUALITY INDICATOR
Indicates the air quality
H. VENTILATION INDICATOR
Appears when the room needs ventilation
I. BAD AIR ALARM INDICATOR
Light up when the air quality is bad
J. °C/°F SWITCH
Changes between degree Centigrade (°C) and Fahrenheit (°F)
K. BATTERYCOMPARTMENT
Accommodates two AA-sized batteries
L. ALARM ON/OFF SWITCH
Turns on or off the bad air alarm
M. RESET BUTTON
Erases all memory and start afresh
N. POWERADAPTERCONNECTOR
Power supply for the unit
POWERREQUIREMENT
The unit comes with a power adapter which should be connected to
the unit to provide adequate power for air sampling.
To connect the power adapter, remove the cover, plug it into the
power adapter connector on the base of the unit before connecting
it to a wall socket.
HOWTOINSTALL THE UNIT
The AR112C Air Quality Monitor is designed to sample and
determine the level of VOC gases in the room that it monitors. This
unit is for indoor use only.
As most VOC gases enter the human body through breathing, it is
recommended you mount or place it at eye level of the user using the
recessed mounting hole or retractable table stand.
For instance, if the unit is to be installed in the living room, it
should be installed at the eye level of a standing adult. If the unit is
to be used in the kid’s room, it should be installed at the eye level
of the kid sitting on the bed.
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DC 6V

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AIRSAMPLING
Once connected to the power, the AR112C starts to initiate. The
whole column on the far right of the bar graph will light up for
approximately 10 minutes.
Then the unit will sample and display air quality according to the
set interval and sensitivity. A normal dynamic display consists of
seven columns of the bar graph lighting up one after another. Then
the display will freeze for a few seconds and start again. The current
temperature and humidity will be displayed at all times.
When operated solely on batteries, the unit will not be able to
sampleairquality. Only the temperature andhumiditywillbe shown
and the botton row bar graph will flash.
HOWTOREADAIRQUALITY
The air quality is displayed on the bar graph and rated very good,
good or bad. An indicator will light up to show what the air quality
is.
You can select to display the average air quality in three intervals:
70 seconds, 7 hours or 7 days. To do so, press MODE repeatedly.
When the 7-hour or 7-day interval is selected, the 0 column means
the current hour or day and each column to its left means a previous
hour or day, respectively. When the 70-second interval is selected,
the current 10 seconds are on the column on the far right. Each
column to its left means 10 previous seconds.
HOWTO ADJUSTSENSITIVITYLEVEL
The sensitivity level affects how the unit rates the air quality. You
may have to adjust the sensitivity according to the actual
environment of the installation or specific needs.
living room
Very Good Good Bad

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To adjust the sensitivity level,
1. Press []. The [
LEVEL
ADJ
]indicator will blink.
2. Every press to [ ], the sensitivity level will change
according to the order : Normal-Low-High-Normal..
3. The unit will also return to normal display after 10 seconds.
Note that the new sensitivity level only applies to future samplings
but not the old ones in memory.
BADAIRWARNING
When the air quality is considered bad, the [ ] indicator will
light up. The [ ]indicator will also appeartoshowtheroomneeds
immediate ventilation. These indicators will remain lit until the air
quality improves.
If the ALARM ON/OFF switch is set on ON, an alarm will also go
off continuously for 10 seconds. If the air quality does not improve,
a beep will be emitted every minute for the next 7 minutes and every
10minutesafterward.Tostop the alarm, press any button. To disable
the feature, set the switch to OFF.
TEMPERATUREANDHUMIDITY
The current temperature and humidity are displayed at all times.
Toshow themaximum orminimum readingsinmemory,press[ ] or
[], respectively. Press the button again to go back to the current
readings. The unit will also do so automatically after 5 seconds.
To clear the memory,press and hold [ ] and [ ] for two seconds.
°C/°F SWITCH
The temperature unit is selected on the °C/°F switch. Slide the switch to
°C for degree Centigrade or °F for degree Fahrenheit. The selected unit
will apply to the current temperature as well as temperatures in memory.
HOWTO USE THEBACKLIGHT
Press [ ] to turn on the backlight for 20 seconds.
THERESETBUTTON
This button is used only when the unit is operating in an
unfavorable way. Use a blunt stylus to hold down the button. All
memories will be erased.
SPECIFICATIONS
Temperature measurement:
Measuring range : -5°C to +50°C (+23°F to +112°F)
Operating range : -5°C to +50°C (+23°F to +112°F)
Relative humidity measurement :
Measuring range: 25% RH to 95% RH
Power:
Main : 3V AC/DC Power adapter
Back up : 2 × UM-3 or “AA” 1.5V alkaline battery
Dimension : 161.0 × 95.0 × 47.0 mm (H × W × D)
Weight : 197.80g (without battery)