Omron MC-343F Digital Thermometer: User Manual and Instructions
This document provides comprehensive instructions for the safe and effective use of the Omron MC-343F Digital Thermometer.
Introduction
Thank you for purchasing the Omron Digital Thermometer MC-343F. This thermometer offers safe, accurate, and quick temperature readings via oral, rectal, or underarm methods, eliminating concerns about broken glass or mercury hazards. Note that temperature readings can be affected by smoking, eating, or drinking. Please read this manual thoroughly before use and practice taking temperatures to gain confidence.
Important Safety Notes
Warnings
- High or prolonged fever requires medical attention, especially for young children. Consult a doctor.
- Read and follow instructions carefully for accurate readings. Factors like physical exertion, hot/cold beverages, and measuring technique can affect results.
- Remain still during measurement.
- Self-diagnosis based on temperature readings is dangerous and may worsen existing conditions. Consult a doctor for interpretation.
- This thermometer is for oral, rectal, or underarm use only. Do not use at other sites like the ear, as it may lead to false readings or injury.
- Store out of reach of children. Do not allow children to take temperatures unattended.
- Keep batteries, battery covers, and probe covers away from children, as they may be swallowed. Contact a doctor immediately if swallowed.
- Do not attempt measurements when the thermometer is wet, as this may result in inaccurate readings.
Cautions
- Do not bite the thermometer; it may break or cause injury.
- Do not share the thermometer among individuals.
- Do not attempt to disassemble or repair the thermometer; this may lead to inaccurate readings.
- Do not incinerate batteries; they may burst.
- Observe polarity ([+]/[-]) when replacing batteries. Incorrect polarity can cause leakage, heat, or bursting.
- Remove the battery if the thermometer will not be used for 3 months or more to prevent leakage or damage.
- Do not use mobile phones near the thermometer.
- Avoid using the thermometer in areas with strong static electricity or electromagnetic fields, as this can cause inaccurate readings or instrument failure.
- Do not force the thermometer into the rectum. Stop insertion if pain occurs.
- Do not attempt rectal measurements on individuals with rectal disorders.
- Do not step on the unit or its case.
- Do not bend the probe tip more than 45 degrees.
- Do not disinfect the sensing section by immersing in alcohol or hot water (over 50°C / 122°F).
- Failure to use a probe cover can lead to bacterial and viral infections.
General Safety Precautions
- Use only for measuring human body temperatures.
- Do not drop the thermometer or expose it to shock or vibration.
- Do not store the thermometer in its case if damp; wipe it dry first.
- Avoid taking temperature for at least 30 minutes after exercise, bathing, or eating/drinking.
Switching Between Fahrenheit/Centigrade (Celsius)
Press and hold the [button] for 7 seconds until a beep is emitted. The display will change to the other measurement scale.
Conversion Chart:
| °C | °F | °C | °F | °C | °F | °C | °F | °C | °F | °C | °F |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 34.4 | 94 | 35.0 | 95 | 35.6 | 96 | 36.1 | 97 | 36.7 | 98 | 37.2 | 99 |
| 37.8 | 100 | 38.3 | 101 | 38.9 | 102 | 39.4 | 103 | 40.0 | 104 | 40.6 | 105 |
Taking the Temperature
Use a probe cover for each measurement. Place it carefully over the tip.
- Press the [button]. The default temperature 37.0°C (98.6°F) is displayed.
- Apply the thermometer to the measurement site: oral, rectal, or underarm.
- For oral and rectal measurement: When the reading is ready, the thermometer will emit a [beep-beep-beep] sound three times. Remove and read the result.
- For underarm measurement: Continue holding for 2-5 minutes to complete the measurement.
- Turn off the thermometer and store it in its protective case. The reading is automatically stored. The thermometer auto-switches off after 30 minutes of use or 3 minutes of inactivity, but manual shut-off conserves battery.
Buzzer Notification Timing: Oral: approx. 20 seconds, Rectal: approx. 10 seconds, Underarm: approx. 25 seconds. (Note: Underarm measurement may require 2-5 minutes for completion).
Display Indicators:
- All symbols appear: When the button is pressed.
- M indicator + last temperature: The most recently measured temperature is displayed.
- [°C (°F)] blinking: Thermometer is ready for use.
- [°C (°F)] blinking: Temperature measurement is in progress.
- [°C (°F)] indicator stays lit: Reading is ready.
Correct Measurement Techniques
Oral Use (for ages 4 and older)
Keep mouth closed for 5 minutes before measurement. Place the thermometer under the tongue, to the left or right of the tongue root. Use tongue pressure to hold it in place and prevent sliding.
Underarm (Axillary) Use
Place the probe tip in the center of the armpit. Lock the tip under the arm with slight inward pressure. For infants, gently hold the arm. The thermometer should be at a 35-45 degree angle to the arm.
Rectal Use
Always use a probe cover. Lubricate with water-soluble gel. Gently insert the probe tip no more than 1.3 cm into the rectum. Do not force insertion if resistance is met. Disinfect after use.
Incorrect Measurements
- Cause: Measuring immediately after exercise, bathing, eating, or drinking. Correction: Wait at least 30 minutes.
- Cause: Measuring after moving around. Correction: Measure immediately after waking or wait 30 minutes after activity.
- Cause (Underarm): Heavy underarm perspiration or being under blankets. Correction: Wipe underarm perspiration before measurement.
Battery Replacement
Battery: Alkaline-Manganese Button Battery LR41 (commercially available).
Replace the battery when the battery replacement indicator [ ] appears.
- Use a coin to remove the battery cover.
- Remove the old battery.
- Insert the new battery with the [+] pole facing up.
- Use a coin to replace the battery cover. Ensure the O-ring is in place for water resistance.
Displaying the Last Temperature
Press the [button] to display the most recently measured temperature.
Error Displays
| Indicator | Cause | Remedy |
|---|---|---|
| [ ] (Temperature sensing section below 32°C / 89.6°F) | Temperature of sensing section is less than 32°C (89.6°F). | This is not an error; ignore and take temperature. |
| [ ] (Temperature sensing section above 42°C / 107.6°F) | Temperature of sensing section is greater than 42°C (107.6°F). | Cool the sensing section and then take the temperature. |
| [ ] (Displayed temperature exceeds 32°C / 89.6°F) | Surrounding temperature exceeds 32°C (89.6°F). | This is not an error; take temperature as is. |
Troubleshooting
| Problem | Cause | Correction |
|---|---|---|
| Wide differences in readings |
| Check placement as per "Correct Measurement" section. |
| Nothing appears in the display when power is pressed. |
|
|
| [37.0°C (98.6°F)] not displayed during preparation, but a reading between [36.9°C (98.4°F)] and [37.1°C (98.8°F)] is shown. | N/A (This is a normal display range). | The thermometer may be used as is. |
| A temperature outside [36.9°C (98.4°F)] to [37.1°C (98.8°F)] is displayed, even after multiple power cycles. | N/A (Potential internal issue). | Contact your nearest authorized OMRON dealer. |
Care and Maintenance
Keeping the Thermometer Clean
- Do not use strong water jets or immerse for long periods.
- Wipe with a soft, clean cloth.
- When using alcohol, avoid contact with the indicator section.
- For stubborn stains, use a cloth dampened with water or neutral detergent, wring thoroughly, and then wipe dry.
- Do not use benzene, thinner, gasoline, or strong solvents.
- Do not soak the sensing section in alcohol for extended periods or sterilize with hot water (over 50°C / 122°F).
- Do not use ultrasonic washing.
Storing the Thermometer
- Store in its protective case.
- Do not store in wet locations, high heat/humidity, direct sunlight, near heating equipment, dusty areas, or areas with high salt concentration.
- Avoid locations subject to leaning, shock, or vibration.
- Avoid pharmaceutical storage areas or locations with corrosive gases.
Specifications
| Product Name | DIGITAL THERMOMETER MC-343F |
| Power Consumption | 0.1mW |
| Sensing Unit | Thermistor |
| Temperature Display | 3-digit, +°C (°F) display in 0.1 degree increments |
| Measurement Accuracy | ±0.1°C (32.0 to 42.0°C) / ±0.2°F (89.6 to 107.6°F) (at 23°C / 73.4°F) |
| Measurement Range | 32.0 to 42.0°C (89.6 to 107.6°F) |
| Power Supply | 1.5V DC, 1 LR41 Alkaline-Manganese Button Battery |
| Battery Life | Approx. 2 years or more (3 times per day) |
| Measurement Method | Actual measurement |
| Protection Against Electric Shock | Internally powered ME equipment, Applied Part: =Type B |
| Usage Environment Temp and Humidity | +10 to +40°C (+50 to +104°F), 30-85%RH |
| Storage Environment Temp and Humidity | -20 to +60°C (–4 to +140°F), 10-95%RH |
| Weight | Approx. 12g (with battery installed) |
| External Dimensions | 19.4 mm (w) × 132.5 mm (l) × 10.0 mm (d) |
| Accessories | Test Battery (LR41), Protective Case, Instruction Sheet, 5 Probe Covers. |
This OMRON product is produced under the strict quality system of OMRON HEALTHCARE Co., Ltd., Japan.
This device fulfills the provisions of the EC directive 93/42/EEC (Medical Device Directive) and the European Standard EN12470-3:2000.
Manufacturer Information
OMRON HEALTHCARE Co., Ltd.
53, Kunotsubo, Terado-cho, Muko, Kyoto 617-0002 JAPAN
OMRON HEALTHCARE EUROPE B.V.
Scorpius 33, 2132 LR Hoofddorp THE NETHERLANDS
OMRON (DALIAN) CO., LTD.
Dalian, China
OMRON HEALTHCARE SINGAPORE PTE LTD.
438A Alexandra Road, #05-05/08, Alexandra Technopark Singapore 119967
www.omron-healthcare.com.sg
