Yonker Infrared Thermometer Operation Manual
Model: YK-IRT2
Version number: V1.2
Latest revision date: 07-2020
Important Safety Instructions
- Please do not use the infrared thermometer for purposes beyond its original design; it is suitable for medical units and home use.
- Since the infrared thermometer is not waterproof, please do not immerse it into water or other liquids. Cleaning and disinfection shall refer to the instructions in the Maintenance and Storage section.
- The infrared thermometer should be placed in a clean and dry place, away from the sun, at a best work temperature between 15°C-40°C and humidity between 30%-85%RH.
- Please do not touch the sensor with your finger.
- Obstructions such as sweat stains, hair, hats, or scarves may cause a lower temperature reading. Please remove obstructions to ensure accurate results.
- Please do not drop, dismantle, repair, or reform the product.
- Please do not keep the infrared thermometer close to strong electrostatic fields or high-intensity magnetic fields, so as to avoid effects on the accuracy of the measured data.
- In case of any problem, please stop using the product and contact the retailer. Please do not fix it on your own.
- Please dispose of the product and battery according to local laws and regulations.
- During long periods of non-use, please take out the battery to avoid liquid leakage due to an expired battery.
- Do not insert new batteries along with semi-used batteries. Hazards or product damages may occur due to inconsistent battery discharge characteristics.
Warnings
- A. Please keep the infrared thermometer out of reach of children.
- B. Please do not put the battery into a fire.
- C. The usage of the infrared thermometer cannot substitute for medical treatment.
Symbols and Definitions
- BF type application part
- Separate collection ♻️
- Refer to operation manual ?
- Cautions ⚠️
- First characteristic numeral 2: IP22 Against ingress of solid foreign objects: ≥12.5mm diameter
- Second characteristic numeral 2: Against ingress of water with harmful effects: dripping (15° tilted)
- Humidity range
- Keep dry ?
- EC REP European union representative
- CE0123 Product certification
- SN Serial number
- MFG Date of manufacture
- Manufacturer
- Standby
- LOT Lot number
- Temperature range
- Keep away from sunlight ☀️
- Up toward ⬆️
1. Product Introduction
This product is a handheld non-contact Infrared Thermometer. It can record 34 sets of body temperature data. Product functions include high and low temperature prompts, backlight display of different body temperature ranges, and auto shutdown.
1.1 Intended Use
The infrared thermometer is specially designed for measuring body temperature. It can measure human forehead temperature and is suitable for medical units and home use.
User Group
- Age: Adult/Children
- Fever patient
- Other people who need to have their temperature taken
- Doctor
1.2 Contraindications
None
1.3 Product Features
- Accurate and fast: 1-second temperature measurement, easy and fast.
- Health and safety: Non-contact measurement of forehead temperature with a measuring distance of ≤1cm, without contacting human skin, thus avoiding cross-infection.
- User-friendly and useful.
- Acousto-optic prompt: Green, yellow, and red backlights indicate whether body temperature is normal, low fever, or high fever, along with a sound prompt.
- Smart analysis: Stores 34 sets of measured data for easy analysis and comparison.
- Correction setup: Setup parameters can be revised to adapt to different skin colors and human bodies with different characteristics.
1.4 Product Structure
A diagram shows the structure of the Infrared Thermometer with numbered parts:
- 1. Sensor: This terminal aligns with the measured object or person.
- 2. Trigger key: Used for power-on and taking measurements.
- 3. ▲ Up key: Used to query memory data.
- 4. SET key: A short press turns the laser positioning on/off; a long press turns the sound on/off.
- 5. ▼ Down key: Used to query memory data.
- 6. MODE key: Switches between body temperature and surface temperature modes.
- 7. Display screen: Displays measured data.
- 8. Battery cover: Can be opened to replace the battery.
- 9. Loudspeaker
1.5 Instruction of Display Screen
The display screen shows:
- 1. Body temperature
- 2. Surface temperature
- 3. Measured value of temperature
- 4. Sound/mute indicator
- 5. Low battery warning
- 6. Measured results: normal/low fever/high fever
- 7. Degrees Celsius (°C)
- 8. Degrees Fahrenheit (°F)
- 9. Number of memory sets
- 10. Memory symbol
2. Technical Specifications
- Working environment: Ambient temperature: 15°C~40°C, Relative humidity: 30%~85%, Atmospheric pressure: 70kPa ~ 106kPa
- Battery voltage: DC3V (2 AAA (7) batteries)
- Product size: Approx. 150mm × 75mm × 50mm (length × width × height)
- Product weight: 120g (without batteries)
- Measuring ranges: 34.0°C ~ 43.0°C
- Range Indicator: <34.0°C Show Lo, >43.0°C Show Hi
- Accuracy: < 35.0°C and >42.0°C: ±0.3°C; 35.0°C~42.0°C: ±0.2°C
- Measuring distance: ≤1cm
- Tri-color backlit: ≤37.5°C Green, 37.6°C~38.0°C Yellow, ≥38.1°C Red
- Auto power-off: ≤60 seconds
- Storage and transportation: Ambient temperature: -20°C ~ 55°C, Relative humidity: 15%~93%, Atmospheric pressure: 50kPa~105kPa
3. Instrument Operation and Usage
3.1 Installing Batteries
- Push the battery cover in the direction of the arrow to open.
- Insert 2 AAA batteries, paying attention to positive and negative electrodes.
- Press the battery cover and push in the opposite direction of the arrow to close.
[Diagram: Battery cover open and close instructions]
3.2 Preparing for Measurement
Correct usage is key for accurate measurements. Follow these tips:
- When measuring body temperature, aim at the middle of the forehead (above eyebrows) and hold the product vertically, at a distance of ≤1cm. Press the "trigger" key to display the measured temperature.
- Before measuring, ensure the forehead is free from obstructions like hair, sweat, cosmetics, or hats.
- If the measured person's temperature differs significantly from the environment, they should remain in the testing environment for about 5 minutes until their temperature stabilizes with the ambient temperature before measuring.
- For fever patients, cooling measures like a cold compress on the forehead may result in lower temperature readings.
- The ambient temperature around the measured person should be stable. Avoid testing in areas with strong airflow, such as near fans or air conditioning outlets.
- Place the infrared thermometer in the operating environment for 20 minutes prior to use to adjust to the ambient temperature.
- Do not use the infrared thermometer in strong sunlight.
- It is recommended to measure three times and use the highest reading.
- When measuring forehead temperature, select the "body temperature" mode.
3.3 Starting Measurement
- Aim at the measured target and press the "trigger" key. The results will be displayed on the screen. The thermometer performs a self-inspection for about two seconds upon powering on.
- After self-inspection, a "beep" will sound (if sound is enabled), indicating the product is ready and measurement is complete. The display will show the results.
Caution:
- If the temperature exceeds the low fever threshold, the LCD backlight will turn yellow.
- If the temperature exceeds the high fever threshold, the LCD backlight will turn red, a crying face emoji will be displayed, accompanied by three quick "beep" sounds.
- After continuously measuring five times, wait at least 20 seconds to ensure measurement accuracy.
3.4 Switching Measurement Patterns
When powered on, a short press of the "MODE" key switches between body temperature and surface temperature modes. The body temperature mode is for measuring human body temperatures.
3.5 Viewing Memory Values
When powered on, a short press of the up (▲) or down (▼) key allows for memory queries. Press the down key (▼) to view earlier measured values and the up key (▲) to view more recent values.
Note:
- A higher memory serial number indicates an earlier measurement; a lower number indicates a more recent one.
- If memory values exist, they will be displayed; otherwise, "---" will be shown.
- The infrared thermometer can store up to 34 sets of recent measurements. Values beyond 34 are automatically overwritten in chronological order.
3.6 Deleting Memory Values
When powered off, press and hold the "MODE" key while pressing the "trigger" key. "CLr" will be displayed, and the product will shut down after two seconds, deleting all memory values.
3.7 Unit Setup
- Unit setup: Turn the power on. Press and hold the "MODE" key until "F1" appears on the screen. Quickly press the down key (▼) to switch between temperature units (°C/°F).
4. Error Messages
| Displayed Problem | Meaning of the Display | Possible Reasons and Troubleshooting |
|---|---|---|
| Hi | Measured temperature is too high | Body temperature mode: the temperature of the measured target is higher than 43°C. Restart by pressing "trigger" key. |
| Lo | Measured temperature is too low | Body temperature mode: the temperature of the measured target is lower than 34°C. Restart by pressing "trigger" key. |
| (flashes) Low battery warning | Low battery warning. Power off after the screen flashes the symbol. Please replace batteries at once. | Battery is not installed well or is dead. Check battery polarity or replace batteries. |
| (blank screen) | Infrared Thermometer will shut down automatically. | The screen is still blank. Please contact the retailer for repair. |
5. Battery Replacement
The infrared thermometer uses 2 AAA (7) batteries. When a low battery warning appears, replace the batteries as described in section 3.1.
Caution
- Pay special attention to battery polarities when opening the battery cover. Incorrect placement may damage the product.
- If the product will not be used for a long period, remove the batteries to prevent damage from potential liquid leakage.
- Do not use the product if it shows signs of battery leakage or mildew.
- Do not expose batteries to fire, as this may cause them to explode.
- Do not store batteries in high temperatures or humidity.
- To prevent short circuits, do not place batteries with metal objects like coins or keys in the same location as the product.
6. Maintenance and Storage
- The accuracy of the infrared probe can be affected if not protected. Do not touch or press it with fingers or other objects.
- Clean the infrared thermometer shell with a 75% alcohol cotton wet cloth. Do not allow liquid to enter the thermometer. Never use corrosive detergents, diluents, or gasoline. Do not immerse the product in water or other liquids.
- Carefully protect the LCD (liquid crystal display) surface.
- Keep the infrared thermometer in a dry place, avoiding dust, pollution, or direct sunlight.
7. Troubleshooting
What may cause "Lo" to appear?
Possible reasons include:
- Measuring distance too far: The designed measuring distance is ≤1cm. Measuring the surrounding environment instead of the person can lead to this error.
- Measuring position deviation: Aim at the middle of the forehead (above eyebrows) and keep the thermometer vertical.
- Obstructions or airflow: Hair covering the forehead, or measurement taken under air conditioning or strong winds can cause "Lo". Ensure the person stays still in a static environment for 5-10 minutes before re-measuring.
- Individual low temperature: In rare cases, individuals may have naturally lower forehead temperatures. Compare with another person's surface temperature measurement (after switching to "surface temperature" mode) to verify.
Is the infrared thermometer dangerous? Does it emit radiation?
The infrared thermometer collects radiant infrared from the human body to calculate body temperature. It passively receives infrared radiation energy and does not directly contact the human body, thus preventing cross-infection. The Yonker infrared thermometer does not emit radiation and is safe for human use.
8. Common Sense of Body Temperature
Body temperature is a vital sign. Different parts of the body have different normal temperature ranges:
| Measured Part | Normal Temperature |
|---|---|
| Temperature of cochlea | 35.8~38.0°C |
| Temperature of forehead | 34.7~37.8°C |
| Temperature of oral cavity | 35.5~37.5°C |
| Temperature of armpit | 34.7~37.3°C |
| Temperature of anus | 36.6~38.0°C |
Body temperature varies throughout the day and is affected by age, gender, skin color, and skin thickness.
| Age | Normal Temperature |
|---|---|
| 0-2 years old | 36.4~38.0°C |
| 3-10 years old | 36.1~37.8°C |
| 11-65 years old | 35.9~37.6°C |
| >65 years old | 35.8~37.5°C |
Female body temperature is generally about 0.3°C higher than male. During ovulation, female body temperature can increase by 0.3-0.5°C, which can be used as a tool for family planning. Measuring daily basic body temperature for at least a month and plotting a curve can help identify ovulation periods.
9. Manufacturer's Declaration of the EUT
Guidance and manufacturer's declaration - electromagnetic emission - for all EQUIPMENT AND SYSTEMS
The Infrared Thermometer is intended for use in the specified electromagnetic environment. Users should ensure it is used appropriately.
| Emissions test | Compliance | Electromagnetic environment - guidance |
|---|---|---|
| RF emissions CISPR 11 | 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 CISPR 11 | 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 used for domestic purposes. |
| Harmonic emissions IEC 61000-3-2 | N/A | |
| Voltage fluctuations / flicker emissions IEC 61000-3-3 | N/A |
Guidance and manufacturer's declaration - electromagnetic immunity - for all EQUIPMENT and SYSTEMS
The Infrared Thermometer is intended for use in the specified electromagnetic environment. Users should ensure it is used appropriately.
| Immunity test | EN 60601 test level | Compliance level | Electromagnetic environment - guidance |
|---|---|---|---|
| Electrostatic discharge (ESD) IEC 61000-4-2 | ± 6 kV contact, ± 8 kV air | ± 6 kV contact, ± 8 kV air | Floors should be wood, concrete or ceramic tile. If floors are covered with a synthetic material, the relative humidity should be at least 30%. |
| Electrostatic transient / burst IEC 61000-4-4 | ± 2 kV for power supply lines, ± 1 kV for input/output lines | N/A | Mains power quality should be that of a typical commercial or hospital environment. |
| Surge IEC 61000-4-5 | ± 1 kV differential mode, ± 2 kV common mode | N/A | Mains power quality should be that of a typical commercial or hospital environment. |
| Voltage dips, short interruptions and voltage variations on power supply input lines IEC 61000-4-11 | < 5% UT (>95% dip in UT) for 0.5 cycle, 40% UT (60% dip in UT) for 5 cycles, 70% UT (30% dip in UT) for 25 cycles, < 5% UT (>95% dip in UT) for 5 sec | N/A | Mains power quality should be that of a typical commercial or hospital environment. If the user requires continued operation during power mains interruptions, it is recommended that the Infrared Thermometer be powered from an uninterruptible power supply or a battery. |
| Power frequency (50/60 Hz) magnetic field IEC 61000-4-8 | 3 A/m | 3 A/m | Power frequency magnetic fields should be at levels characteristic of a typical location in a typical commercial or hospital environment. |
Recommended separation distances between portable and mobile RF communications equipment and the EQUIPMENT or SYSTEM:
The Infrared Thermometer is intended for use in an electromagnetic environment where radiated RF disturbances are controlled. Maintain a minimum distance between RF communications equipment and the thermometer as recommended below, based on the transmitter's maximum output power.
| Rated maximum output of transmitter (W) | Separation distance according to frequency of transmitter (m) | ||
|---|---|---|---|
| 150 kHz to 80 MHz (d=1.2√P) | 80 MHz to 800 MHz (d=0.8√P) | 800 MHz to 2.5 GHz (d=1.2√P) | |
| 0.01 | 0.12 | 0.1 | 0.12 |
| 0.1 | 0.38 | 0.3 | 0.38 |
| 1 | 1.2 | 1 | 1.2 |
| 10 | 3.8 | 3 | 3.8 |
| 100 | 12 | 10 | 12 |
For transmitters with maximum output power not listed, the recommended separation distance 'd' in meters (m) can be estimated using the equation applicable to the transmitter's frequency, where P is the maximum output power in watts (W).
Note: At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies. These guidelines may not apply in all situations, as electromagnetic propagation is affected by absorption and reflection from structures, objects, and people.
Guidance and manufacturer's declaration - electromagnetic immunity - for EQUIPMENT and SYSTEMS that are not LIFE-SUPPORTING
The Infrared Thermometer is intended for use in the specified electromagnetic environment. Users should ensure it is used appropriately.
| Immunity test | EN 60601 test level | Compliance level | Electromagnetic environment - guidance |
|---|---|---|---|
| Conducted RF IEC 61000-4-6 | 3 Vrms 150 kHz to 80 MHz | N/A | 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 d=1.2√P for 80 MHz to 800 MHz and d=2.3√P for 800 MHz to 2.5 GHz, where P is the maximum output power rating of the transmitter in watts (W) and d is the recommended separation distance in meters (m). |
| Radiated RF IEC 61000-4-3 | 3 V/m 80 MHz to 2.5 GHz | 3 V/m | Field strengths from fixed RF transmitters, as determined by an electromagnetic site survey, should be less than the compliance level in each frequency range. Interference may occur in the vicinity of equipment marked with the following symbol: ?. Note 1: At 80 MHz and 800 MHz, the higher frequency range applies. Note 2: These guidelines may not apply in all situations. Electromagnetism is affected by absorption and reflection from structures, objects, and people. 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 where 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. Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3V/m. |
This company shall bear no quality responsibility for machine faults due to the customer's nonobservance of the above precautions or other correct application methods.
10. Warranty and Manufacturer Information
10.1 Warranty
- Yonker provides a one-year free warranty from the date of purchase.
- The warranty does not cover faults caused by user-related reasons, including unauthorized dismantling, accidental dropping, improper maintenance, failure to operate according to the manual, natural disasters, or unauthorized repairs.
- Proof of purchase and a warranty card are required for free service.
- For warranty service, please return the product to the point of purchase for repair.
- Circuit diagrams and data of repairable components can be provided to qualified technicians if necessary for warranty service.
- Repair services beyond the warranty period will be charged according to regulations.
Statement: If you believe the device is damaged or abnormal, stop using it and contact the manufacturer.
10.2 Manufacturer Information
Contact information:
Xuzhou Yongkang Electronic Science Technology Co., Ltd
4F Building C8, 40 Jingshan Road, Economic and Technological Development Zone, Xuzhou, China
TEL: +86-516-87892766-601 FAX: +86-516-87892755-606
EC REP:
Xuzhou Yongkang Electronic Science Technology Co., Ltd
4F Building C8, 40 Jingshan Road, Economic and Technological Development Zone, 221000 Xuzhou, PEOPLE'S REPUBLIC OF CHINA
European Representative:
Prolinx GmbH
Brehmstr.56, 40239, Duesseldorf, Germany
Product Configuration List
| Item Name | Quantity | Certification |
|---|---|---|
| Host | 1 | CE0123 |
| Manual | 1 |
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