Infrared Thermometer
Operating Manual
Model: AOJ-20A
Software Version: V1.2.7
Issuing Date: 2021/01/20
English
German
Spanish
Italian
French
EN
Introduction
Thank you for purchasing this Forehead and Ear
Infrared Thermometer.
Please read the Operating Manual carefully before
using the thermometer, and put it in a safe and secure
place for reference.
Foreword
The infrared thermometer can be used to read the
body temperature by measuring the ear and forehead
temperature, which is suitable for adult and children
(ear test mode only for the child above 3 months).
Package Contents
No.
Name
Quantity
1
Infrared Thermometer
1
2 Pouch 1
3 Battery (AAA, optional) 2
4 Operating Manual 1
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EN
1. WARNINGS AND PRECAUTIONS ............................. 1
2. Product Description .................................................. 3
1) Overview ............................................................... 3
2) Structure ............................................................... 3
3) Operating principle.............................................. 4
4) Indications for use............................................... 5
5) Contraindications ................................................ 5
3. Features...................................................................... 6
4. Product Structure ...................................................... 6
5. Display description ................................................... 7
6. How to use your thermometer ................................ 7
1) In order to avoid the inaccuracy ....................... 7
2) Take your forehead temperature...................... 8
3) Take your ear temperature ................................ 9
4) After a measurement ......................................... 10
5) Read your temperature ...................................... 10
6) Switching between mute and un-mute............ 11
7) Checking 40 sets of memory data ................... 11
8) °C/°F conversion ................................................ 11
9) To turn off ............................................................. 11
10) Replace the battery ............................................ 12
7. Temperature taking tips .......................................... 12
8. Care and cleaning ..................................................... 13
9. Error and Troubleshooting ....................................... 14
10. Technical Specifications .......................................... 15
11. Symbols ...................................................................... 16
12. Appendix: EMC information-Guidance and
manufacturer’s declarations ................................... 17
13. Warranty and After-Sale Service ............................ 22
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EN
1. WARNINGS AND PRECAUTIONS
1) Keep out of reach of children under 12 years.
2) Never immerse the thermometer into water or
other liquids (not waterproof). For cleaning and
disinfecting, please follow the instructions in the
“Care and cleaning” section.
3) Never use the thermometer for purposes other than
those it has been intended for. Please follow the
general safety precautions when using on children.
4) Keep the thermometer away from direct exposure
to the sun and keep it in a dust- free, dry area, well-
ventilated place at a temperature between 10°C
(50°F) - 40°C (104°F). Do not use the thermometer
in high humidity environments. (>95% RH)
5) Do not use the thermometer if there are signs of
damage on the measuring sensor or on the instru-
ment itself. If damaged, do not attempt to repair
the instrument! Please contact the dealer.
6) This thermometer consists of high-quality
precision parts. Do not drop the instrument.
Protect it from severe impact and shock. Do not
twist the instrument or the measuring sensor.
7) Please consult your doctor if you see symptoms
such as unexplained irritability, vomiting, diarrhea,
dehydration, changes in appetite or activity,
seizure, muscle pain, shivering, stiff neck, pain
when urinating, etc., even in the absence of fever.
8) Even in the absence of fever, those who exhibit a
normal temperature may still need to receive
medical attention. People who are on antibiotics,
analgesics, or antipyretics should not be assessed
solely on temperature readings to determine the
severity of their illness.
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9) Temperature elevation may signal a serious
illness, especially in adults who are old, frail, have
a weakened immune system, or neonates and
infants. Please seek professional advice
immediately when there is a temperature
elevation and if you are taking temperature for
whom are:
● Over 60 years of age (Fever may be blunted or even
absent in elderly patients)
● Having diabetes mellitus or a weakened immune
system (e.g., HIV positive, cancer, chemotherapy,
chronic steroid treatment, splenectomy)
● Bedridden (e.g., nursing home patient, stroke,
chronic illness)
● A transplant patient (e.g., liver, heart, lung, kidney)
10) This thermometer is not intended for preterm
babies or small-for-gestational age babies. This
thermometer is not intended to interpret
hypothermic temperatures. Do not allow children
to take their temperatures unattended.
11) Use of this thermometer is not intended as a
substitute for consultation with your physician or
pediatrician.
12) Clean the thermometer probe after each use.
13) Do not use the thermometer on newborns or for
continuous temperature monitoring purposes.
14) Do not take a measurement while or immediately
after nursing a baby.
15) Patients should not drink, eat, or be physically
active before/while taking the measurement.
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2. Product Description
1) Overview
Infrared Thermometer measures the body
temperature based on the infrared energy emitted
from the eardrum or the forehead. Users can
quickly get measurement results after positioning
properly the temperature probe in the ear canal or
forehead.
Normal body temperature is a range. The following
tables shows that this normal range also varies by
site. Therefore, readings from different site should
not be directly compared. Tell your doctor what
type of thermometer you used to take your
temperature and on what part of the body. Also
bear this in mind if you are diagnosing yourself.
Measuring part Normal temperature range
Forehead temperature 36.1°C - 37.5°C (97°F - 99.5°F)
Ear temperature 35.8°C - 38°C (96.4°F -100.4°F)
Oral temperature 35.5°C - 37.5°C (95.9°F - 99.5°F)
Rectal temperature 36.6°C - 38°C (97.9°F - 100.4°F)
Axillary temperature 34.7°C - 37.3°C (94.5°F - 99.1°F)
2) Structure
The device consists of enclosure, button, a
temperature sensor, Infrared temperature -
measuring element, microcomputer controlled
circuit, LCD, backlight and a buzzer.
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3) Operating principle
In the nature, for all objects whose temperature is
higher than the absolute zero (-273.15°C), for the
sake of molecule’s thermal motion, radiate
electromagnetic wave to the surrounding ambient
including the infrared wave without a break, the
relationship between the density of radiation energy
with the object’s temperature conform to the
radiation law.
The infrared thermometer’s working principle is based
on the fourth-power law: infer objects’ radiation
temperature by measuring objects’ radiation infrared
energy. Thermopile sensor can convert the infrared
energy into thermoelectricity, and output as a
detected signal after signal processing.
1-Subject 2-Object len 3-Heat plate 4-Thermocouple 5-Eye Len
Figure 1
The infrared temperature sensor detects infrared
energy emitted by the eardrum. A built-in lens
focuses the collected energy, which is then
converted into a temperature reading by the
thermopiles and measurement circuits.
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Figure 3
4) Indications for use
The infrared thermometers take human body
temperature via the eardrum or forehead. The
forehead mode is indicated for people of all ages and
the eardrum mode is indicated for people above three
months old. It applies to both professional use and
home use.
5) Contraindications
Do not use the thermometer if the ear is infected
with otitis or suppuration.
Infrared Thermometer probe
Infrared ray
Ear canal
Eardrum
Figure 2
Optical
Component
Tympanic
Membrane
Ear canal
External Ear
Probe
Cover
Ir Sensor
Computer
Display
Reference
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3. Features
● Magnetic probe cover and automatic mode switch
between forehead & ear mode
● Quick measurement, less than 1 second
● Small body with super large font
● Multi-functional, can measure ear & forehead.
● Accurate: clinically accurate algorithm with three
stage calibration
● Reliable: each thermometer will do environmental
test under 15-35°C during production
● Easy operation, one button design, to measure ear &
forehead.
● 40 sets of memories, easy to recall
● Switching between mute and un-mute mode
● Audio and visual fever warning
● Switching between °C and °F
● Auto shut-down and power-saving
● Backlight color temperature indication
● Patent technology to realize separate measurement
of adult and child
4. Product Structure
1. LCD display screen
2.
Mode/Memory button
3.
Measure/Mute-unmute
button
4.
Probe
5.
Battery cover
6.
Probe cover (take it
off when measuring
ear temperature)
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5. Display description
1. Adult forehead mode
2. Child forehead mode
(under 12 years old)
3. Ear mode
4. Object mode
5. Fahrenheit/Celsius degrees
6. Previous temperature value
7. Low battery indication
8. Mute/Un-mute icon
9. Current temperature value
6. How to use your thermometer
(1) In order to avoid the inaccuracy:
1) Please make sure that the device will be used in the
room only, and there is no strongly conversation of wind.
2) Please make sure that there is no intense emotion and
movement before measuring.
3) If the device is transferred from one condition to
another, which has different ambient temperature, it is
suggested to deposit for more than 30 minutes.
4) If the tester is transferred from one condition to
another, which has different ambient temperature, it is
suggested to have a rest for more than 10 minutes.
5) Do not hold the device for a longtime, as it is highly
sensitive to heat.
The device has undergone clinical test, it is safe and
accurate when using in accordance with operation
manual.
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(2) Take your forehead temperature
1) When using the thermometer for the first time,
please load the batteries.
2) Press and release the Measure Button in one second
to power on.
3) Press the ode Button to choose or . Then
point the temperature probe at the center of the
forehead, with a distance of 0-3 cm (0-1.18 inches).
4) Press and release the Measure Button in 1 second.
The beep is heard, you can now read the value.
NOTE: The forehead measurement is an indicative
reading. The measured forehead temperature can
fluctuate up to 1°F/0.5°C from your actual body
temperature. Please be aware of the factors that
influence the accuracy as described in the section
“Temperature taking tips” and “WARNINGS AND
PRECAUTIONS”.
If the eyebrow area is covered with hair, sweat or dirt,
please clean the area beforehand to improve the
reading accuracy.
Always check if the lens is clean.
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Always make sure the user and the thermometer will
have been in the same room for at least 30 minutes
prior to the measurement.
(3) Take your ear temperature
1) Press the Measure/Mute-unmute button
to power on.
2) Take off the probe cover, fit the probe snuggly into
the ear canal.
3) Press and release the Measure/Mute-unmute button
in 1 second, the beep is heard, you can now read the
value.
Please make sure that the ear is clean, with no
earwax or obstructions.
The right ear reading may differ from the reading
taken at the left ear. Therefore, always take the
temperature in the same ear.
Note:
Children under 1 year: Pull the ear straight back.
Children aged 1 year to adult: Pull the ear up and
back.
Do not force the thermometer into the ear canal.
Otherwise, the ear canal may get injured.
When taking the temperature on an adult, gently pull
the ear up and back to make sure the ear canal is
straight, so that the temperature probe can receive
an infrared ray from the eardrum.
Be careful when taking temperature on a child,
whose ear canal is small.
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(4) After a measurement
Once the reading has been completed, remove the
thermometer away from the forehead/ear and
observe temperature.
After each measurement, you can enter the recall
mode and query earlier temperature readings.
Do not hold the thermometer for a long time,
because it is sensitive to the ambient temperature.
After each measurement, clean the temperature
probe with a soft cloth, and put the thermometer in
a dry and well-ventilated place.
You should wait at least 10 seconds between each
measurement.
It is dangerous to make a self-diagnosis or self-
treatment based on the obtained measurement
results. For such purposes, please consult a doctor.
(5) Read your temperature
“T” indicates a temperature reading.
1) In forehead or ear mode.
If 32°C T 37.5°C (89.6°F T 99.5°F), the
green light will be displayed, with one long beep.
If 37.6°C T 38.0°C (99.7
0
F T 100.4° F), the
orange light will be displayed with 6 short beeps,
each with 2 short sounds, which is a warning that you
may have a low fever.
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If 38.1°C T 42.9°C (100.6°F T 109.2°F), the
red light will be displayed with 6 short beeps, each with
2 short sounds, which is a warning that you may have a
high fever.
(6) Switching between mute and un-mute
When the thermometer is turned on, keep pressing the
Measure Button for 5 seconds, to switch from un-mute
to mute.
(7) Checking 40 sets of memory data
When the thermometer is turned on, keep
pressing the Mode button for 5 seconds to
go to the memory mode, press this button
again to check the 40 sets of memories
one by one. If no value, it will display “
—”.
(8) °C/°F conversion
Open the battery cover, use the toggle
switch to change the °C/°F.
(9) Automatically turn off
The unit will shut down automatically
after 10 seconds of no use.
Caution
All memory records will be lost when
uninstall or reinstall the battery.
toggle
switch
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(10) Replace the battery.
Put two AAA batteries correctly into the compartment.
Remove the batteries if the thermometer will not be
used for more than two months.
7. Temperature taking tips
1) It is important to know each individual’s normal
temperature when they are well. This is the only way
to accurately diagnose a fever. Record readings twice
a day (early morning and late afternoon). Take the
average of the two temperatures to calculate normal
oral equivalent temperature. Always take the
temperature in the same location, since the
temperature readings may vary from different
locations on the forehead.
2) A child’s normal temperature can be as high as
99.9°F (37.7°C) or as low as 97.0°F (36.1°C). Please
note that this unit reads 0.5°C (0.9°F) lower than a
rectal digital thermometer.
3) External factors may influence ear temperatures,
including when an individual has:
● been lying on one ear or the other
● had their ears covered
● been exposed to very hot or very cold temperatures
● been recently swimming or bathing
In these cases, remove the individual from the
situation and wait 20 minutes prior to taking a
temperature.
Use the untreated ear if prescription ear drops or other
ear medications have been placed in the ear canal.
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4) Holding the thermometer for too long in the hand
before taking a measurement can cause the device
to warm up. This means the measurement could be
incorrect.
5) Patients and the thermometer should stay in steady-
state room condition for at least 30 minutes.
6) Before placing the thermometer sensor onto the
forehead, remove dirt, hair, or sweat from the
forehead area. Wait 10 minutes after cleaning
before taking measurement
7) Use an alcohol swab to carefully clean the sensor
and wait for 5 minutes before taking a
measurement on another patient. Wiping the
forehead with a warm or cool cloth may impact your
reading. It is advised to wait 10 minutes before
taking a reading.
8) In the following situations it is recommended that 3-
5 measurements in the same location be taken and
the highest one taken as the reading:
● Newborn infants in the first 100 days.
● Children under three years of age with a
compromised immune system and for whom the
presence or absence of fever is critical.
● When the user is learning how to use the
thermometer for the first time until he/she has
familiarized himself/herself with the instrument and
obtains consistent readings.
8. Care and cleaning
Use an alcohol swab or cotton swab moistened with
70% alcohol to clean the thermometer casing and
the measuring probe. After the alcohol has
completely dried out, you can take a new
measurement.
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Ensure that no liquid enters the interior
of the thermometer. Never use abrasive
cleaning agents, thinners or benzene for
cleaning and never immerse the
instrument in water or other cleaning
liquids. Take care not to scratch the
surface of the LCD screen.
9. Error and Troubleshooting
Symptom
Possible Cause
Description & Solution
Failed to
power on
The battery level is too
low.
Replace with a new battery
Polarities of the batteries
are reversed.
Ensure the batteries are in the right
position
The thermometer is
damaged
Contact dealer
The reading
is too low
The lens of the probe is
dirty.
Clean the lens with a cotton swab.
The distance of the item
and target is too far
Keep in contact with skin, or put the
probe into the Ear Canal.
You have just come from
a cold environment
Stay in a warmer room for at least 30
minutes before taking a reading
The reading
is too high
You have just come from
a hot environment.
Stay in an adequately cool room for at
least 30 minutes before taking a
reading
The ambient temperature
is not in range.
One long beep, and red backlit for 3
seconds. Take a measurement under
an ambient temperatu
re between 10°C
(50.0°F) and 40°C (104°F).
Memory error or
calibration is not finished.
Item will be turned off
automatically after 3
seconds.
One long beep, and red backlit for 3
seconds. Contact dealer.
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10. Technical Specifications:
Product name
Forehead & Ear Infrared Thermometer
Applicable
regulations and
laws
ASTM E 1965-98 (Re-approved 2009)
Standard Specification for Infrared Thermometers
for Intermittent Determination of Patient
Temperature
ISO80601-2-56 First Edition 2009-10-01
Medical Electrical Equipment - Part 2-
56: Particular
Requirements For Basic Safety And Essential
Performance Of Clinical Thermometers For Body
Temperature Measurement. (General Plastic
Surgery/General Hospital)
Display
Segment LCD, Four color LED backlight
(white, green, orange, red)
Temperature
units
°C/°F, switchable
Power supply
DC 3V, AAAX2
Measurement
range
Forehead & Ear: 32.0°C-42.9°C (89.6°F-109.2°F)
Object: 0°C-100
o
C (32°F-199
o
F)
Accuracy
(Laboratory)
Ear & Forehead mode
±0.2°C/±0.4°F
Object mode ±1.0°C/2.0°F
Symptom
Possible Cause
Description & Solution
In ear or forehead mode,
T>42.9°C (109.2°F)
In object mode,
T>100°C (199°F)
One long beep, and red
backlit for 3 seconds.
In ear or forehead mode,
T<32°C(89.6°F)
In object mode,
T<0°C (32°F)
One long beep, and red
backlit for 3 seconds.
The power voltage is
between 2.4V-2.7V
The battery icon will flicker, it
means the battery is low, but
you still can use the
thermometer.
The power voltage is
lower than 2.4V
The battery icon will flicker, the
item will be turned off
automatically after 3 seconds.
Please replace with a new
battery.
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Display resolution
0.1°C/°F
Automatic
10s±1s
Shutdown Memory 40 groups of measured temperature.
Operational
conditions
Temperature:10°C-40°C (50°F-104°F)
Humidity: 15-95%RH, non-condensing
Atmospheric pressure:70-106kPa
Storage condition
Ambient Temperature: -20°C-55°C(-4°F-131°F)
Relative Humidity: 0-95% RH, non-condensing
Atmospheric pressure: 50kPa to 106kPa
Battery
2*AAA, can be used for more than 3000 times
Weight &
Dimension
80g (with battery), 143x35x41mm
11. Symbols:
Symbol
Description
Type BF applied part.
Information about a manufacturer.
Please read the instructions carefully.
Waste electrical materials should be sent to a dedicated
collection point for recycling.
SN
Serial number
LOT Batch number
IMPORTANT
Inaccurate reading or thermometer damage may occur if
the thermometer is not co meetly used.
IP22
2 Protected against solid foreign objects of 12,5 mm Ø
and greater;
2 If keep the thermometer in 15 degree angle, it still can
prevent the water drop.
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12. Appendix: EMC Information - Guidance and
manufacturer’s declarations
CAUTION:
● The Infrared Thermometer needs special
precautions regarding EMC and needs to be
installed and put into service according to the EMC
information provided for in the ACCOMPANYING
DOCUMENTS.
● Portable and mobile RF communications
equipment can affect Infrared Thermometer.
● The Infrared Thermometer should not be used
adjacent to or stacked with other equipment.
Guidance and manufacturer’s declaration -
electromagnetic emission - for all EQUIPMENT AND
SYSTEMS.
Guidance and manufacturer’s declaration - electromagnetic emission
The Infrared Thermometer is intended for use in the electromagnetic
environment specified below. The customer or the user of the Infrared
Thermometer should assure that it is used in such an environment.
Emissions
Compliance
Electromagnetic environment - guidance
test RF
emissions
CISPR11
Group 1
The Infrared Thermometer uses RF energy
only for its internal function. Therefore, its
RF emissions are very low and are not
likely to cause any interference in nearby
electronic equipment.
RF
emissions
CISPR11
Class B
The Infrared Thermometer is suitable for
use in all establishments, including
domestic establishments and those directly
connected to the public low-voltage power
supply network that supplies buildings
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Guidance and manufacturer’s declaration -
electromagnetic immunity - for all EQUIPMENT
and SYSTEMS
Guidance and manufacturer’s declaration - electromagnetic immunity
The Infrared Thermometer is intended for use in the electromagnetic
environment specified below. The customer or the user of the Infrared
Thermometer should assure that it is used in such an environment.
Immunity
test
IEC 60601
test
level
Compliance
level
Electromagnetic
environment - guidance
Electrostatic
discharge
(ESD) IEC
61000-4-2
±8kV
contact
±15 kV
air
±8kV
contact
±15 kV
air
Floors should be wood,
concrete or ceramic tile. If
floors are covered with
synthetic material, the
relative
humidity should be at
least 30%.
Power
frequency
(50/60Hz)
magnetic field
IEC 61000-4-8
30 A/m 30 A/m
Power frequency magnetic
fields should be at levels
characteristic of a typical
location in a typical
commercial or hospital
environment.
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Guidance and manufacturer’s declaration -
electromagnetic immunity - for EQUIPMENT and
SYSTEM that are not LIFE SUPPORTING
Guidance and manufacturer’s declaration - electromagnetic immunity
The Infrared Thermometer is intended for use in the electromagnetic environment
specified below. The customer or the user of the Infrared Thermometer should
assure that it is used in such an environment.
Immunity
test
IEC 60601
Test level
Compliance
Level
Electromagnetic environment - guidance
Radiated
RF
IEC
61000-4-3
3 V/m
80 MHz to
2.5 GHz
10 V/m
Portable and mobile RF communications
equipment should be used no closer to
any part of the Infrared Thermometer,
including cables, than the recommended
separation distance calculated from the
equation applicable to the frequency of
the transmitter.
Recommended separation distance:
80 MHz to 800 MHz
800 MHz to 2.5 GHz
Where “p” is the maximum output power
rating of the transmitter in watts (W)
according to the transmitter manufacturer
and d is recommended separation
distance in meters (m).
b
Field strengths from fixed RF
transmitters, as determined by an
Electromagnetic site survey, a should be
less than the compliance level in each
frequency range.
b
Interference may occur in the vicinity of
equipment marked with the following
symbol:
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NOTE 1: At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2: These guidelines may not apply in all situations.
Electromagnetic is affected by absorption and reflection from
structures, objects and people.
a. Field strengths from fixed transmitters, such as base stations
for radio (cellular/cordless) telephones and land mobile radios,
amateur radio, AM and FM radio broadcast and TV broadcast
cannot be predicted theoretically with accuracy. To assess the
electromagnetic environment due to fixed RF transmitters, an
electromagnetic site survey should be considered. If the
measured field strength in the location in which the Infrared
Thermometer is used exceeds the applicable RF compliance
level above, the Infrared Thermometer should be observed to
verify normal operation. If abnormal performance is observed,
additional measures may be necessary, such as reorienting or
relocating the Infrared Thermometer.
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Recommended separation distances between portable and
mobile RF communications equipment and the
EQUIPMENT or SYSTEM - for EQUIPMENT and SYSTEMS that
are not LIFE-SUPPORTING
Recommended separation distances between portable and mobile RF
communications equipment and the Infrared Thermometer.
The Infrared Thermometer is intended for use in an electromagnetic environment
in which radiated RF disturbances are controlled. The customer or the user of the
Infrared Thermometer can help prevent electromagnetic interference by
maintaining a minimum distance between portable and
mobile RF communications
equipment (transmitters) and the Infrared Thermometer as recommend
ed below,
according to the maximum output power of the communications equipment
Rated
maximum
output
power of
transmitter
W
Separation distance according to frequency of transmitter m
150 kHz to 80 MHz
80 MHz to 800 MHz
800 MHz to 2,5 GHz
0.01 / 0.12 0.23
0.1 / 0.38 0.73
1 / 1.2 2.3
10 / 3.8 7.3
100 / 12 23
The Infrared Thermometer is intended for use in an electromagnetic
environment
in which radiated RF disturbances are controled. The customer or the user of the
Infrared Thermometer can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications
equipment (trans
mitters) and the Infrared Thermometer as recommended below,
according to the maximum output power of the communications equipment.
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13. Warranty and After-Sale Service
The device is under warranty for 12 months from the
date of purchase.
The batteries, the packaging, and any damage caused
by improper use are not covered by the warranty.
Excluding the following user-caused failures:
1) Failure resulting from unauthorized disassembly and
modification.
2) Failure resulting from an unexpected dropping during
application or transportation.
3) Failure resulting from not following the instructions in
the operating manual.
Share Info Consultant Service
LLC Repräsentanzbüro
Address: Heerdter Lohweg 83,
40549 Düsseldorf
Shenzhen AOJ Medical Technology Co., Ltd
Add: 601,6
th
floor, B2 Building, An’le Industrial Park,
#172 Hangcheng Avenue, Sanwei Community,
Hangcheng Street, Bao’an, Shenzhen, China
Accuracy Obtains Joy and Health
