Kingdun Electronic KD-218A User manual

Carbon Monoxide Alarm
User Manual
Model: KD-218A
Ningbo Kingdun Electronic Industry Co., Ltd.
Brief introduction
Thank you for purchasing this carbon monoxide alarm produced by our
company. Make sure that you read this user manual thoroughly before
using the product. This user manual applies to model KD-218A and
KD-218E.
This product can emit visual and audible alarms. The two models
KD-218A and KD-218E have the same performance and configuration.
The only difference is the patterns of the top covers.
Difference between KD-218A and KD-218E: Top cover
This product has the following features:
This alarm has been designed and tested to detect CO in a residential
environment. It implements standard BS EN 50291-1:2018. It uses
electrochemical sensor and has high sensitivity, stable performance,
strong anti-interference, small size and long service life. It can provide
sensor fault warning, low battery warning, end-of-life warning and low
CO concentration warning.
Important:
Make sure that you read this user manual thoroughly before
using the product.
This carbon monoxide alarm is designed to detect carbon
monoxide and can NOT be used to detect smoke or any other
gas. As the covering area of CO detection is limited, we
recommend you to install CO alarms in each room of your
home to protect the whole family effectively.

Contents
1 Product features and specifications
1.1 Electric Parameters
1.2 Brief introduction of the product
1.2.1 Product structure
1.2.2 Parts function
1.3 Information indication and power-up
1.3.1 Information indication
1.3.2 Power-up
1.4 Operating characteristic
1.4.1 Normal operation
1.4.2 Alarm condition
1.4.3 Low CO concentration warning
1.4.4 Testing
1.4.5 Alarm silence
1.5 Fault warnings and handling
1.5.1 Sensor fault warning and handling
1.5.2 Low battery warning and handling
1.6 Service life and end-of-life warning
1.6.1 Service life
1.6.2 End-of-life warning
2 Installation
2.1 Installation locations
2.2 Installation instructions
2.3 Notes for installation
3 Maintenance
3.1 Other gases’ influence on the product
3.2 Cleaning and maintenance
3.3 Maintenance tips
3.4 Hazard of dismantling and repairing the alarm without
authorization
4 Information about carbon monoxide
4.1General carbon monoxide information
4.2Possible sources of carbon monoxide
4.3 Symptoms of CO poisoning
4.4 What to do when the alarm sounds
5 Accessories list
1 Product features and specifications
1.1 Electric Parameters
Gas detected: carbon monoxide
Dimension: 107*77*36mm
Weight: 116g
Power: 3-AA LR6 Batteries
Low battery warning: When the voltage is less than 3.6V, low
battery warning is given. The unit can still work properly for 7
days after the warning.
Working condition: temperature -10℃to +45℃, 0-93% relative
humidity
Quiescent current: <30uA
Alarm current: <65mA
Audible alarm: >85dB (3m from the unit)
Concentration range displayed: 10－550PPM
Accuracy of Digital Display:
A) 30PPM ±6PPM
B) 50PPM ±10PPM
C) 100PPM ±15%
D) 300PPM ±15%

Alarm response times: comply with BS EN 50291‑1:2018
Condition CO concentration Without alarm
before
With alarm
before
A 27±3 PPM 120 min --
B 55±5 PPM 60 min 90 min
C 110±10 PPM 10 min 40 min
D 330±30P MM -- 3 min
Low CO concentration warning: When CO concentration is
greater than 30PPM for a duration of more than 60 minutes, or
when CO concentration is greater than 40PPM for a duration of
more than 40 minutes, low CO concentration warning will be
made.
Quit alarm condition: When CO concentration is below 40PPM,
alarm will terminate automatically.
Power indicator: Flashes about every 45 seconds.
Fault warning: When a fault occurs, fault warning will be given
within 3 minutes.
Suitable place: Domestic premises.
Product service life: 10 years.
1.2 Brief introduction of the product
1.2.1 Product structure
The structure of KD-218A/E is as follows:
1.2.2 Parts function
1) CO Alarm: The whole product.
2) LCD display: Show detector’s parameters.
3) Buzzer: Sounder of the detector.
4) Power indicator: Green light that is used for power indication.
5) Fault indicator: Yellow light that is used for fault indication.
6) Alarm indicator: Red light that is used for alarm indication.
7) Test button: For testing and alarm silence.
Important:
After 10 years’ lifetime, stop using the product for your
safety and scrap it according to local laws and regulations.
Figure 1
1: CO Alarm. 2: LCD display. 3: Buzzer.
4: Power indicator. 5: Fault indicator. 6: Alarm indicator.
7: Test button. 8: Sensor inlet. 9: Battery compartment.
10: Mounting hole. 11: Mounting plate.
12: Screw hole. 13: Buckle.

8) Sensor inlet: Gas inlet.
9) Battery compartment: Where to install the battery.
10) Mounting hole: Hole for the buckle.
11) Mounting plate: The plate that the detector is attached to for
support.
12) Screw hole: Hole for screw installation.
13) Buckle: For attaching the detector to the mounting plate.
1.3 Information indication and power-up
1.3.1 Information indication
1.3.1.1 Information indication chart
Information Status Function
Power-up
prompt
The Power indicator,
Fault indicator and Alarm
indicator
will flash at the
same time, and the
buzzer beeps at the same
time.
It indicates that the
power supply is normally
connected. The indicator
light is on and the
buzzer can sound
normally, indicating that
the indicator lights and
buzzer are working
normally, otherwise
there is a fault.
Normal
operation
The Power indicator
flashes at least once
every minute.
I
t indicates the detector
is in normal operation.
Low
battery
warning
The Fault indicator
flashes with a beep at
least once every minute.
I
t indicates batteries
need to be replaced.
Fault
warning
The Fault indicator will
flash twice with beeps.
F
ault warning will be
given at least once every
minute when fault is
detected.
It indicates there is fault
in the sensor or circuit.
Fault warnin
g will be
given at least once every
minute until fault is
removed.
End-of-life
warning
The Fault indicator will
flash 3 times with beeps.
The end-of-
life warning
will be given at least once
every minute.
It indicates end of unit
life.
Alarm
warning
The A
larm indicator
flashes 5 times with
beeps.
That makes one
cycle of alarm. Alarm
warning will be made 3
times every 10 seconds.
It indicates alarm
condition and dangerous
concentrations of CO is
detected.
Alarm
silence
W
hen the detector is in
alarm condit
ion, press
and hold the TEST
button, then it will enter
alarm silence condition.
Alarm silence condition is
the same as alarm
condition except the
buzzer doesn’t beep
temporarily. The Alarm
indicator still flashes.
A
larm silence condition
lasts less than 10
minutes.
It indicates alarm
condition without beeps,
only when the CO
concentration is less
than 200PPM.

Low CO
concentrati
on warning
The Alarm indicator will
flash 4 times with beeps
at a slower speed. Low
CO concentration
warning will be given at
leas
t once every five
minutes and the interval
will be at least 3
minutes.
It indicates low
concentration of CO is
detected.
Test ing
Press the TEST button,
and the Power, Fault and
Alarm indicator will flash
once at the same time. If
the detector
is working
properly, then
one cycle
of alarm will be made. If
there is malfunction, then
fault warning will be
made.
For manual testing.
1.3.1.2 LCD information
The LCD display can show CO concentration, battery level,
fault warning, end-of-life warning, power-up prompt and testing
operation.
1.3.1.3 Power-up prompt
It indicates power-up.
1.3.1.4 Battery level
A) Enough
B) Normal
C) Low
D) Low battery warning will be made.
1.3.1.5 CO concentration
The LCD display shows CO concentration in PPM.
When CO concentration is less than 10 PPM, it shows 0 PPM.
When CO concentration is more than 550 PPM, it shows “Hco”.
When CO concentration is more than 550 PPM, it is very
dangerous.

1.3.1.6 Testing operation
It indicates testing is in progress.
1.3.1.7 Fault warning
It indicates fault warning.
1.3.1.8 End-of-life warning
It indicates end of unit life, and the product needs to be
replaced.
1.3.1.9 Power-up prompt
When batteries are installed and the detector is powered up,
power-up prompt will be given. It indicates that the power
supply is normally connected, and the indicator lights and
buzzer are working normally.
The LCD display shows ”EN”.
1.3.1.10 Battery level
When the detector is in normal operation, the Power indicator
flashes every 45 seconds. If low concentration of CO is
detected but alarm has not been triggered, the interval will be
less than 45 seconds.
The LCD display shows battery level all the time.
1.3.1.11 Low battery warning
When the voltage is less than 3.6V, low battery warning will be
given at least once every minute.
The LCD display shows condition D as specified in 1.3.1.4.
1.3.1.12 Fault warning
If there is fault in the sensor or circuit, fault warning will be given
within 3 minutes. Fault warning will be made at least once every
minute until the fault is eliminated.
The LCD display shows “Err” when fault warning is given.
1.3.1.13 End-of-life warning
When the detector has been working for about 10 years,
end-of-life warning will be given. The product cannot be used
any more.
The LCD display shows “End” when end-of-unit-life warning is
given
1.3.1.14 Alarm warning
The alarm response time of this detector complies with EN
50291. In alarm condition, at least three cycles of alarm will be
made, and the interval between each cycle will be less than 10
seconds. The alarm will terminate automatically in 6 minutes
when CO disappears.
1.3.1.15 Alarm silence
When the detector is in alarm condition and the CO
concentration is less than 200 PPM, press and hold the TEST

button and it will enter alarm silence condition. Alarm silence
condition is the same as alarm condition except the buzzer
doesn’t beep temporarily. The Alarm indicator still flashes.
Alarm silence condition lasts less than 10 minutes. Press the
TEST button in alarm silence condition, and it will recover alarm
condition immediately.
1.3.1.16 Low CO concentration warning
When CO concentration is greater than 30PPM for a duration of
more than 60 minutes, or when CO concentration is greater
than 40PPM for a duration of more than 40 minutes, low CO
concentration warning will be made every 3 to 5 minutes. The
low CO concentration warning is distinctly different from alarm
warning, please refer to Section 1.3.1.1.
1.3.1.17 Te s ti ng
When the detector is in normal operation, press the TEST
button and testing will be conducted. If the detector is in alarm
condition, it will enter alarm silence condition.
1.3.2 Power-up
This product has battery compartment with red battery pin. Use
3 replaceable AA LR6 alkaline batteries.
The detector will be powered on after 3 AA LR6 batteries are
installed.
Press the red battery pin and install the batteries according to
the polarity marks in the battery compartment.
If the power-up prompt complies with contents of Section 1.3.1,
it means the buzzer and indicator lights are working normally.
The detector will enter normal operation within 20 to 30
seconds after power-up.
The detector must be powered on in clean air without carbon
monoxide. Otherwise, alarm warning may be given
immediately.
1.4 Operating characteristic
1.4.1 Normal operation
The detector will enter normal operation within 20 to 30
seconds after power-up. The Power indicator flashes every 45
seconds. When there is CO in the air, the Power indicator
flashed every 30 seconds. The Fault indicator and Alarm
indicator are off.
1.4.2 Alarm condition
The alarm response time of the detector complies with EN
50291. The alarm won’t stop until CO concentration is lower
than 40PPM. Put the detector in clean air, the alarm will
terminate automatically in 6 minutes, or you can quit alarm
condition by pressing and holding the TEST button for 1 to 3
seconds.
Warning:
The detector must be powered on in clean air without
carbon monoxide. Otherwise, alarm warning may be given
immediately.
Important:
When you hear successive beeps, it means high
concentration of CO. You and all the personnel shall leave
the dangerous site at once and seek help.

1.4.3 Low CO concentration warning
In daily life, low levels of carbon monoxide can often occur. For
example, cigarette smoking, burning candle and gas-burning
appliances can produce low concentrations of CO. Although it
may do no harm to normal people, prolonged exposure to low
levels of CO can impair the health of vulnerable groups such as
children, pregnant women, elderly or patients. This warning is to
help these people avoid prolonged exposure to low levels of CO.
It doesn’t mean a dangerous situation, so please don’t be panic.
When CO concentration is greater than 30PPM for a duration of
more than 60 minutes, or when CO concentration is greater
than 40PPM for a duration of more than 40 minutes, low CO
concentration warning will be made. The low CO concentration
warning which has been specified in Section 1.3.1 is distinctly
different from alarm warning:
difference
Low CO concentration
warning
Alarm warning
1
The Alarm indicator
flashes
4 times with
beeps at a slower
speed.
The Alarm indicator
flashes 5 times with
beeps at a faster
speed.
2
Low CO concentration
warning
is given once
every 3 to 5 minutes.
Alarm warning is given
3 times every 10
seconds.
Low CO concentration warning won’t stop until CO
concentration is less than 25 PPM.
1.4.4 Testing
Test the CO alarm at least once a week by pressing the TEST
button, to make sure the sensor, buzzer and indicator lights are
operating properly.
Press the TEST button, and the Power, Fault and Alarm
indicators will flash once at the same time. If the detector is
working properly, then one cycle of alarm will be made. If there
is malfunction, then fault warning will be made.
Wait at least 5 seconds if you want to perform the test operation
again.
When testing, the LCD display shows ”- - -”.
Important:
Please test the product at least once a week to ensure the
unit is working properly.
Important:
If you hear 4 slower beeps every 3 to 5 minutes instead of
continuous alarm sounds, it’s low CO concentration warning.
Don’t be panic. If you continuous alarm sounds with short
intervals, it’s alarm warning. It is very dangerous, please
leave the scene immediately.

1.4.5 Alarm silence
When the detector is in alarm condition and the CO
concentration is less than 200 PPM, press and hold the TEST
button and it will enter alarm silence condition. Alarm silence
condition is the same as alarm condition except the buzzer
doesn’t beep temporarily. The Alarm indicator still flashes.
Alarm silence condition lasts less than 10 minutes. The higher
the CO concentration is, the shorter the alarm silence condition
lasts. When the alarm silence condition ends, and it will recover
alarm condition. You can also quit alarm condition by pressing
and holding the TEST button for 1 to 3 seconds. If CO
disappears, it will quit alarm silence condition automatically.
Make sure you are not in a dangerous situation before alarm
silence operation.
When the detector is in alarm condition, press and hold the
TEST button for 3 to 5 seconds until you see the Alarm indicator
flashes with no beep, then it will enter alarm silence condition. If
you press and hold the TEST button and still hear beeps, the
CO concentration may be more than 200 PPM. In this case, you
cannot silence the alarm.
When the detector is in alarm silence condition, press and hold
the TEST button until you hear beeps, then it will recover alarm
condition.
1.5 Fault warnings and handling
1.5.1 Sensor fault warning and handling
If there is fault in the sensor or circuit, fault warning will be given
within 3 minutes. Fault warning will be made at least once every
minute until the fault is eliminated.
When fault warning is given, there may be open circuit or short
circuit in the sensor. Or there may be electronic damage.
Volatile gas like ethyl alcohol may affect the sensor and cause
temporary fault. In this case, please replace the product with a
new one. Then power off the damaged unit and put it in clean
air for 24 hours, and it will return to normal.
If the unit can’t recover after being placed in clean air for 24
hours, that means permanent damage. Please don’t use the
product any more. Don’t repair it yourself or send to the
service point that is not authorized by the manufacturer.
1.5.2 Low battery warning and handling
When the detector is in normal operation, battery capacity is
checked every minute. When the voltage is less than 3.6V, low
battery warning will be given, the LCD display will show
condition D as specified in Section 1.3.1.4.
When low battery warning commences, batteries are only
capable of giving low battery warning for one month, or giving
alarm warning for a few minutes. So please replace the AA LR6
batteries as soon as possible.
Important:
W
hen you hear one beep every minute and see
condition D on the LCD display, please replace the LR6 AA
batteries immediately. O
therwise, the detector may not
work properly, which will threaten your health.
Warning:
When the alarm is damaged permanently, please stop
using it. Don’t repair it yourself or send to the service point
that is not authorized by the manufacturer.

1.6 Service life and end-of-life warning
1.6.1 Service life
This product has a service life of 10 years. After power-up, the
product starts timing and when it reaches 10 years the unit will
give end-of-life warning. You have to replace the product when
this warning is given.
1.6.2 End-of-life warning
End-of-life warning will be made at least once every minute,
which has been specified in Section 1.3.1.
If the detector is powered on or off frequently, it may cause
timing error. So please don’t power on or off the detector
frequently. And please often check the product's manufacturing
date, to see whether it has expired.
2 Installation
2.1 Installation locations
Install the products in bedroom and living areas. You can also
install them in the places where you think may have CO
leakage. To make sure people can hear the alarm from all
sleeping area, we suggest you install this product on each level
of your home.
To avoid causing damage to the product, to prevent false alarm
and to provide optimum performance, do not install the unit in
the following places:
2.1.1 Do not install the unit in enclosure space (such as in the
kitchen cabinet or behind the curtain).
2.1.2 Do not install the unit in the obstructive place (such as
behind the furniture).
2.1.3 Do not install the unit on the floor or in the water channel.
2.1.4 Do not install near the door and window.
2.1.5 Do not install near fan or air conditioner.
2.1.6 Do not install near the vents or flues.
2.1.7 Do not install in areas where the temperature can easily
decrease to -10℃or exceed 40℃, unless you especially need
to install like this.
2.1.8 Do not install in areas where there are a lot of lampblack
and dust which will block up the sensor.
2.1.9 Do not install in too damp areas.
2.1.10 Do not install near kitchen wares or cooking equipment.
2.2 Installation instructions
Install the unit where it’s easy for the user to test and operate.
For wall mounting, the height of installation position should be
more than 1.5m. The unit should be at least 0.3m from the
ceiling. Besides, the unit should keep 1.5m away from the
corner, wall side and large furniture.
Steps of alarm installation
a) Take out the mounting plate and line it with the wall in the
position that you have chosen for installation. Mark the holes
with a pencil dot. With the aid of your wall punch and hammer,
make two holes (6mm diameter, 40mm depth) on the marked
spots.
b) Insert the two plastic anchors into the holes. Secure the
mounting plate to the wall upwards by screwing.
c) After making sure the mounting plate is secured to the wall,
power on the detector and test according to 1.4.4. If the test
Important:
When you hear three quick beeps at intervals, it means end
of unit life. Please replace the product with a new one
immediately.

result is normal, then slide the alarm down over the mounting
plate until it snaps into place.
2.3 Notes for installation
The detector cannot snap into place until the batteries are
installed correctly. Please don’t force to install in avoidance
of damage.
If you install the alarm in the garage, please do not install
the alarm near the exhaust port of motor vehicles. Because
when your car starts, high concentration of CO will be
discharged and the temporary CO that will not kill lives may
cause the alarm.
3 Maintenance
3.1 Other gases’ influence on the product
The following gases make cause false alarm or damage the
sensor:
Methane, propane, isobutane, ethylene, ethanol, alcohol,
isopropanol, benzene, toluene, ethyl acetate, hydrogen,
hydrogen sulfide and sulfur dioxide. Almost all the Aerosol spray,
alcoholica, paint, thinner, solvent, binder, hair spray, aftershave,
perfume, car exhaust (cold start) and some cleaning detergents.
When the product is exposed to the gases mentioned above, it
may make false alarms or be damaged permanently. When
alarms are activated and you smell irritating gas, it may be false
alarm because CO is colorless and odorless. Put the product in
clean air, if it’s still in alarm condition 30 minutes later, then that
means the product has been polluted. You should place the
power-off unit in clean air for a long time. If the product can’t
recover 24 hours later, then it means the sensor has been
damaged and please don’t use the product any more.
3.2 Cleaning and maintenance
The product must be kept clean when used, or its performance
will be influenced and even may cause damage to the alarm. It
shall be cleaned and tested once a month in the following way.
3.2.1 Remove dust with vacuum cleaner.
3.2.2 Rub the surface with wet soft cloth which has been
wringed out.
3.2.3 Press the TEST button and make sure the detector woks
properly, then reinstall it to use.
Don’t clean the alarm with chemical like alcohol, petrol, cleanser,
etc., or it may cause damage to the alarm.
Important:
If the product is polluted by other gases, place the power-off
unit in clean air. If the product can’t recover 24 hours later,
please don’t use the product any more.
Warning:
In order to ensure the product is correctly installed and
used, it should be installed strictly according to this user
manual or be installed by qualified professional personnel.

3.3 Maintenance tips
Do not spray chemical aerosol like air freshener, hair
spray, perfume, insecticide or spray paint near the alarm.
Do not paint the CO alarm. If you need to paint the wall
and floor, please put the alarm into a clean plastic bag first.
After the smell has been fully volatilized, install the alarm again.
Do not block up or cover the alarm’s venthole with paste
adhesive or other things.
If the detector falls on the floor, pick it up to check
whether the battery is fixed well. After making sure the battery is
installed well, press the TEST button again to see if the
functions run well before installing it again.
3.4 Hazard of dismantling and repairing the alarm without
authorization
The detector has been calibrated before leaving the factory. If
you dismantle it without permission and change any component
or software, it may cause false alarm or malfunction. So please
don’t dismantle or modify any component or program.
4 Information about carbon monoxide
4.1 General carbon monoxide information
Carbon monoxide is a colorless and odorless gas which can
cause people to die and will engender when any combustible
material burns. When burning the combustible material in the
limited room, higher concentration carbon monoxide will be
engendered. When people absorb a certain amount of carbon
monoxide, they will die. Now many countries’ Consumer
Product Safety Commissions have warned the public the harm
of fatal family poison gas and make the carbon monoxide
poison as the first public safety problem.
4.2 Possible sources of carbon monoxide
In home, carbon monoxide may be engendered from heating
and burning equipment, such as stove, water heater, fireplace,
charcoal-burning grill, natural gas furnace, heating devices,
microgenerator and so on. Vehicles running in attached
garages can also produce CO.
When these devices are in well-ventilated condition or in normal
working condition, the amount of carbon monoxide will be little
and discharged quickly without doing harm to people. But when
there is lack of oxygen or the burning is not sufficient, or the
devices have problems, high concentration carbon monoxide
will engender. Because the ventilation is not good, and the
carbon monoxide is not given off quickly, the high concentration
carbon monoxide will be accumulated to the extent that will
harm people’s health.
Important:
Clean the product once a month. Don’t clean the alarm with
chemical cleanser.
Warning:
Please don’t dismantle or modify any comp
onent or
program, or it will cause malfunction.

4.3 Symptoms of CO poisoning
Common mild symptoms:
Slight headache, nausea, vomiting, fatigue.
Common medium symptoms
Headache, drowsiness, confusion, fast heart rate.
Common severe symptoms：
Convulsion, unconsciousness, cardio-respiratory failure, brain
injury, death.
Young children and the elderly may be more vulnerable. Please
pay attention to high-risk persons because they may
experience a more dangerous situation at a certain level.
If you experience even mild symtoms of CO poisoning, please
consult your doctor immediately!
4.4 What to do when the alarm sounds
As carbon monoxide can kill your lives, please take the
following actions if the product alarms:
1) Stop using all fuel-burning appliances and ensure that
they are turned off. Open doors and windows quickly. Turn
on ventilation and exhaust systems.
2) Make sure all the people move to fresh air immediately.
Call emergency service for help. Don’t reenter the
premises until the alarm stops and remains in normal
condition.
3) Get medical help for anyone suffering the effects of
carbon monoxide poisoning.
4) If the alarm reactivates within 24 hours, repeat above
steps and call a qualified appliance technician to
investigate sources of CO from fuel burning equipment
and appliances, and to check if ventilation and exhaust
system is working properly. If problems are identified
during the inspection, stop using the equipment
immediately. Let qualified appliance technician repair it.
Warning:
The product only indicates the presence of carbon
monoxide, and warns people to deal with the situation or
leave. It cannot prevent CO from occurring.
Warning:
Carbon monoxide is a poisonous gas that can kill people’s
lives. When the product
alarms, it means the carbon
monoxide has been engendered and it’s very dangerous.
Warning:
The product may not prevent the chronic effects of carbon
monoxide exposure.
And it may not fully safeguard
individuals at special risk.

5 Accessories list
The product leaves factory with the following accessories:
No.
Accessory Name
Quantity
1 CO alarm 1
2 Mounting plate 1
3
Screw
2
4 Plastic anchor 2
5
User manual
1
This user manual is very important for you to use the product,
please read it carefully and store it well. Our company assumes no
responsibility if the product is damaged because of human
factors which causes a loss.
Thank you for purchasing our products!
――――――――――――――――――――――――――－
Ningbo Kingdun Electronic Industry Co., Ltd.
Tel : [phone]
Fax: [phone]
Add：No.28 Fengyuan Road, south of economic develop area,
Yuyao city, Zhejiang P.R., China
Document reference: QS0701-D-22181－602
Version: A/4
Date: 2021-01-07