Omron Electronic Thermometer MC-670 / MC-671

About This Manual

Thank you for purchasing an Omron product. Please read this manual carefully before use to ensure safe and correct operation. Keep this manual handy for future reference. This manual also serves as a warranty certificate; please store it safely.

How to Take Your Temperature Correctly

Accurate Measurement Requires Proper Placement

Incorrect placement of the thermometer can lead to inaccurate readings. Ensure the thermometer is placed correctly in the armpit.

• Place the thermometer at the center of the armpit. The temperature is highest at the center and lower towards the periphery.

Situations Where Accurate Measurement is Difficult

• Immediately after exercise, bathing, or eating or drinking: Wait at least 30 minutes.
• When the armpit is sweaty: Wipe away sweat thoroughly before measuring.
• When the patient has been in bed for a long time and the armpit is sweaty: Wipe away sweat thoroughly before measuring.
• Immediately after waking up: Measure before moving around, or wait at least 30 minutes after starting to move.
• When the temperature sensor of the thermometer is touching clothing: Ensure the thermometer does not touch clothing and remeasure.
• When the thermometer is not positioned correctly: Place the sensor at the center of the armpit and hold it firmly by gently pressing from below.
• When measuring consecutively: Turn off the power, wait at least 30 seconds, and then measure again.

Why 30-Second Measurement? (Predictive Measurement)

What is Body Temperature?

Body temperature refers to the temperature of the internal organs, such as the brain and internal organs, which have minimal temperature fluctuations.

It Takes About 10 Minutes for Accurate Armpit Temperature

Although the armpit may feel warm, it is exposed to the outside air to some extent. It takes about 10 minutes of keeping the armpit closed to reach the same temperature as the internal body.

This internal body temperature is called the "equilibrium temperature.".

Predicting 10-Minute Temperature in 30 Seconds

The Omron MC-670 and MC-671 analyze and calculate the rate of temperature increase from the start of measurement in real-time, allowing them to predict the equilibrium temperature in an average of 30 seconds.

Temperature Distribution in the Body: The internal body is warmer than the armpit.

Predictive Measurement Process:

• Measurement starts.
• The rate of temperature increase is analyzed and calculated.
• After an average of 30 seconds, the predictive measurement is complete.

Real Measurement (Actual Measurement):

• For more precise temperature measurement as directed by a doctor, use the actual measurement function. Refer to the right page for instructions on actual measurement.
• The actual measurement takes approximately 10 minutes.

How to Measure Temperature (Measurement Process)

1. Remove the thermometer from its case and turn it on by pressing the power switch. The display will light up, and the previous measurement's temperature will be shown with an "m" mark.
2. When the "℃" symbol starts blinking, firmly place the thermometer in the center of your armpit. Ensure the display faces inward. Gently press your arm to hold the thermometer in place.
3. After approximately 30 seconds, a buzzer will sound three times, indicating the predictive measurement is complete. The outer circle will blink, and the "●" and "℃" symbols will light up.
4. Confirm the measurement result.
5. Turn off the power by pressing and holding the power switch for over 2 seconds until a beep is heard. Store the thermometer in its case.

Note: If you do not turn off the power, the thermometer will automatically switch to actual measurement. If left unattended after actual measurement, it will turn off automatically after approximately 3 minutes.

For Actual Measurement:

If you continue to keep the thermometer in your armpit after predictive measurement is complete, actual measurement will begin automatically after about 30 seconds. After approximately 10 minutes, a buzzer will sound three times ("piririri"), indicating the end of actual measurement. Confirm the result, turn off the power, and store the thermometer in its case.

Note: When actual measurement begins, the display will switch from the predictive measurement value to the actual measurement value.

Error Displays

Safety Precautions

Warnings

• Do not self-diagnose or treat based on measurement results. Consult a doctor.
• Keep out of reach of infants and children. Do not allow children to use the thermometer alone.
• Keep batteries and screws out of reach of infants and children. If swallowed, seek immediate medical attention.
• This thermometer is for armpit use only. Do not use it in the ear or mouth, as this may lead to inaccurate readings or injury.
• Do not measure with a wet thermometer. This can lead to inaccurate readings or worsen illness.
• Do not bite the main unit. This can cause accidents or malfunctions.
• Do not share the thermometer among multiple people. This can lead to the spread of germs.
• Ensure the battery is inserted with the correct polarity. Incorrect insertion can cause overheating, leakage, or rupture, leading to damage or injury.
• Use only the specified battery type. Using incorrect batteries can cause overheating, leakage, or rupture, leading to damage or injury.
• The main unit is not waterproof. Prevent water from entering the main unit to avoid inaccurate readings or malfunctions.
• Do not disassemble, repair, or modify the unit. This can lead to inaccurate readings or malfunctions.
• Do not expose to strong static electricity or electromagnetic fields, as this may cause measurement errors or malfunctions.
• Do not heat batteries or dispose of them in fire. Lithium metal may melt, causing violent rupture and ignition.

Cautions

• Do not use for purposes other than measuring human body temperature.
• Do not subject the unit or case to strong shocks, drops, impacts, or vibrations.
• Do not store the thermometer in its case while wet. Dry it with a cloth first.
• Do not use solvents like benzine or thinner to clean the unit.
• Do not immerse the temperature sensor in alcohol or sterilize it with boiling water (over 50℃).
• Do not use ultrasonic cleaning.
• Do not store in places exposed to water, high humidity, direct sunlight, near heating appliances, dusty areas, or areas with salty air.
• Avoid storing in locations with inclines, vibrations, or shocks, or where chemical substances or corrosive gases are present.

Battery Replacement

Battery Type: Lithium battery CR2016 (commercially available)

Battery Replacement Indicator: When the "℃" symbol blinks during measurement preparation, and the indicator shown in the diagram appears, it is time to replace the battery.

1. Unscrew the battery cover on the back of the unit with a small screwdriver.
2. Using a thin, non-brittle object, remove the battery cover and the old battery.
3. Insert the new battery with the "+" side facing up, as shown in the diagram.
4. Replace the battery cover and secure it with the screw.

Note: Be careful as the battery may pop out.

Specifications

• Model: MC-670, MC-671
• Medical Device Certification Number: 219AGBZX00042000, 219AGBZX00042A01
• Classification: Medical Device
• Sales Name: Omron Electronic Thermometer MC-670 / MC-671
• Power Source: DC 3.0V (1 x CR2016 lithium battery)
• Battery Life: Approx. 1100 times (predictive measurement), Approx. 150 times (actual measurement)
• Temperature Sensor: Thermistor
• Measurement Method: Predictive/Actual
• Temperature Display: 3 digits + ℃, 0.1℃ increments
• Measurement Accuracy: ±0.1℃ (in a constant temperature water bath at standard room temperature 23℃)
• Measurement Range: 32.0℃ to 42.0℃
• Operating Environment: Ambient Temperature: +10℃ to +40℃, Relative Humidity: 30% to 85% RH
• Storage Environment: Ambient Temperature: -20℃ to +60℃, Relative Humidity: 10% to 95% RH
• Main Unit Weight: Approx. 27g (including battery)
• Dimensions: Width 34mm x Length 125.2mm x Thickness 15mm
• Accessories: Test battery (CR2016 x 1), Storage case, User manual (with warranty), Medical device attachment document
• EMC Compliance: Complies with IEC 60601-1-2:2001

Omron Customer Service

For inquiries regarding Omron healthcare products, repairs, or accessories, please contact:

Omron Customer Service Center
Phone: 0120-30-6606 (Toll-free)
FAX: 0120-10-1625 (Toll-free)
Hours: 9:00 AM - 7:00 PM, Monday - Friday (excluding holidays)
Website: http://www.healthcare.omron.co.jp/

Manufacturer and Distributor:
Omron Healthcare Co., Ltd.
53 Kuno-tsubo, Terado-cho, Muko City, Kyoto 617-0002, Japan

Warranty Information

Omron Healthcare Co., Ltd. warrants this product against defects in materials and workmanship for a period of one year from the date of purchase, provided it is used in accordance with the instructions in this manual. This warranty is valid only in Japan.

The warranty covers free repair or replacement if a defect occurs within one year of normal use. For warranty service, please contact the Omron Customer Service Center. Repairs may be subject to charge in cases of misuse, unauthorized modification, accidental damage, or failure to present the warranty certificate.

Spare parts will be kept in stock for at least six years after production is discontinued.

Disposal

Please follow your local municipality's guidelines for the disposal of used batteries and the main unit.