Beurer FT 90 Thermometer

Beurer Non-contact fever thermometer
Model:FT 90

Dear customer,
Thank you for choosing one of our products. Our name stands for high-quality, thoroughly tested products for applications in the areas of heat, gentle therapy, blood pressure/diagnosis, weight, massage and air.
Please read these instructions for use carefully and observe the information they contain.
With kind regards,
Your Beurer Team

This clinical thermometer is intended for non-contact measurement of forehead, object and room temperature. The thermometer is suitable for domestic use. It allows you to quickly and easily measure body temperature Values are saved automatically.

  1. Safety notes

1.1 Risks to the user

  • Only use the device once you have read and understood these instructions for use.
  • Retain these instructions for use. The instructions for use must be accessible to all users.
  • All instructions must be followed.
  • The thermometer needs to be in the room in which the measurement is taken for at least 30 minutes before use.
  • The FT 90 thermometer is only designed for the measuring area on the human body stated in the instructions for use.
  • The device is only intended for the purpose stated in these instructions for use.
  • Children must not be allowed to use the device. Medical products are not toys.
  • Check before each use that the lens is intact. If it is damaged, please contact your
  • retailer or the service address.
  • The device has been designed for practical use, but is not a substitute for a visit to the doctor.
  • Should you have any questions about using the device, please contact either your retailer or Customer Services.

1.2 Risks to the device

  • Do not subject the device to mechanical impacts.
  • Do not expose the device to direct sunlight.
  • Do not expose the device to liquids. The device is not waterproof. Avoid all direct contact with water or other liquids.
  • Have the device repaired by authorised service centres only, otherwise its warranty is invalidated.
  • Portable and mobile HF communication systems may interfere with this device. More details can be requested from the stated Customer Service address or found at the end of the instructions for use.

1.3 Notes on handling batteries

  • If your skin or eyes come into contact with battery fluid, flush out the affected areas with water and seek medical assistance.
  • Choking hazard! Small children may swallow and choke on batteries. Store the batteries out of the reach of small children.
  • Observe the plus (+) and minus (-) polarity signs.
  • If a battery has leaked, put on protective gloves and clean the battery compartment with a dry cloth.
  • Protect the batteries from excessive heat.
  • Risk of explosion! Never throw batteries into a fire.
  • Do not charge or short-circuit batteries.
  • If the device is not to be used for a long period, take the batteries out of the battery compartment.
  • Use identical or equivalent battery types only .
  • Always replace all batteries at the same time.
  • Do not use rechargeable batteries.
  • Do not disassemble, split or crush the batteries.

2. Information about this thermometer
The temperature measurement varies depending on the part of the body where the measurement is taken. In a healthy person, the variance can be between 0.2 °C and 1 °C (0.4 °F and 1.8 °F) in different parts of the body.

Normal temperature range with various thermometers

Normal temperature range with various thermometers

Beurer tip
• Temperatures measured with different thermometers should never be compared
with one another.
• 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.

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.

Influences on body temperature

• A person’s individual metabolism
• Age
Body temperature is higher in babies and toddlers than in adults. Greater temperature fluctuations occur faster and more often in children. Normal body temperature decreases with age.
• Clothing
• Outside temperature
Time of day
Body temperature is lower in the morning and increases throughout the day towards evening.
Physical and, to a lesser extent, mental activities increase body temperature.

Beurer tip
Taking the body temperature provides a current measurement of a person’s temperature. If you are uncertain about interpreting the results or if the values are
abnormal (e.g. fever), please consult your doctor. This also applies in the case of
slight temperature changes if there are other symptoms of illness such as agitation,
severe sweating, flushed skin, fast pulse rate, tendency to collapse, etc.

3. Unit description

Unit description

1. Display
2. MODE/MEM button
3. On/Off button
4. LIGHT/SET button
5. SCAN button
6. Measuring sensor
7. Battery compartment lock
8. Battery compartment lid


3.1 Display description

Display description

1. Object temperature mode
2. Room temperature mode
3. Forehead temperature mode
4. Acoustic signal symbol
5. Year
6. Memory function
7. Date
8. Battery level
9. Temperature/memory space number display
10. Celsius/Fahrenheit measurement unit
11. Measurement ≥ 38.0°C (≥100.4°F) “fever”
12. Measurement < 38.0°C (<100.4°F) “no fever”
13. Illuminated display symbol
14. Year/date/time display

4. Initial use
If provided, pull out the battery insulating strip at the battery compartment or remove the protective film from the battery and insert the battery with the correct polarity.
9. Batteries
After a brief self-test and two short beeps the thermometer is ready for forehead measurement

5. Switching on and setting the thermometer
Briefly press the On/Off POWER button .
After a brief self-test and two short beeps the thermometer is ready for forehead measurement.
The device always starts up in forehead temperature mode .

5.1 Setting the basic functions
This menu allows you to set the following functions individually, one after another.

Setting the basic functions

• With the thermometer switched on, press and hold the LIGHT/SET button for 5 seconds. The time format option flashes on the display (fig. 1).
• Use the MODE/MEM button to set your preferred time format and confirm with the LIGHT/SET button.


The year flashes in the display (fig. 2).
• Use the MODE/MEM button to set the year and confirm with the LIGHT/SET button.
Day/month flashes in the display (fig. 3).
• Use the MODE/MEM button to set the day and month, and confirm with the LIGHT/SET button.

The year flashes

In the 24h format, the date is displayed as day/ month. In the 12h format, it is displayed as month/ day.

The time flashes in the display (fig. 4).
• Use the MODE/MEM button to set the time and confirm with the LIGHT/SET button.


In the 12h format, the time is displayed as AM/PM.

The temperature measurement unit flashes in the display (fig. 5).
You can set the device to display the temperature in degrees Celsius (°C) or degrees Fahrenheit (°F).


• To display the temperature in Celsius, select °C using the MODE/MEM button and confirm with the LIGHT/SET button.
• To display the temperature in Fahrenheit, select °F using the MODE/MEM button and confirm with the LIGHT/SET button.

The acoustic signal symbol flashes in the display (fig. 6). You can activate/deactivate the acoustic signals (device activation, measurement in progress, measurement completion).


• To activate the acoustic signals, select using the MODE/MEM button and confirm with the LIGHT/ SET button.
• To deactivate the acoustic signals, select using the MODE/MEM button and confirm with the LIGHT/SET button.

The light symbol flashes in the display (fig. 7). You can activate or deactivate the automatic illuminated display (appears following forehead temperature measurement).

light symbol

• To activate the automatic illuminated display, select using the MODE/MEM button and confirm with the LIGHT/SET button.
• To deactivate the automatic illuminated display, select using the MODE/MEM button and confirm with the LIGHT/SET button.

You can also activate the illuminated display manually by briefly pressing the LIGHT/
SET button. The display lights up for 5 seconds.

The automatic and manual illuminated display cannot be used while measurement
is in progress.

6. Forehead measurement
Briefly press the On/Off button POWER.
After a brief self-test and two short beeps the device is ready for forehead temperature measurement. The device is in forehead temperature mode. This is indicated by the symbol.

Beurer tip
Remember that
• physical activity, increased perspiration on the forehead, taking vasoconstrictive
medication and skin irritations can distort the result,
• the forehead, or the temples, must be free from perspiration and cosmetics.

Hold the thermometer 2 to 3 cm from the measuring point. Press the SCAN button and move the thermometer from side to side over the forehead area (fig. 8).
During measurement you will hear short beeps (only if the acoustic signal is activated), which signal that the thermometer has found a new highest measurement.
End of measurement is signalled by a long beep.
Release the SCAN button.
You can now read the measured value.
In addition to the temperature, the fever or no fever symbols also appear in the display:
The no fever symbol indicates that the body temperature is within normal range; the
fever symbol indicates a measurement equal to or higher than 38°C (100.4°F), which
triggers a temperature alarm.
If the acoustic signal is switched on, three beeps will sound once the measurement is complete if the temperature is equal to or higher than 38°C (100.4 °F).
The measuring time is usually 2 seconds but may take up to 30 seconds.
When two short beeps sound and the forehead symbol stops flashing, the device is
ready to take another measurement.
The measurement is automatically saved with the date/time and the “fever” / “no fever” classification.


6.1 Displaying saved measurements
The device only stores measurements in forehead temperature mode . The device automatically stores the values from the last 60 measurements. When 60 storage places are exceeded the oldest value is deleted.
The memory can be called up as follows:
• With the thermometer switched on, press and hold the MODE/MEM button for 5 seconds. The most recent measurement is displayed.
• With each subsequent pressing of the MODE/MEM button, first the storage space number is displayed followed by the measurement upon release.
• In the upper line, the time and date are displayed alternately.

7. Measuring object temperature / room temperature


8. Error messages

Error messages

9. Batteries
The device requires two AAA (LR03) batteries.
• Open the battery compartment. Use a pointed object to press down on the battery compartment lock and at the same time slide the battery compartment downwards.

• Take the used batteries out of the battery compartment.
• Insert new batteries. Make sure that the batteries are inserted the right way round.
• Close the battery compartment.


The empty, completely flat batteries must be disposed of through specially designated collection boxes, recycling points or electronics retailers. You are legally required to dispose of the batteries.
The codes below are printed on batteries containing harmful substances:
PB = Battery contains lead,
Cd = Battery contains cadmium,
Hg = Battery contains mercury.

10. Cleaning the device

• The measuring sensor is the most sensitive part of the thermometer. Take great
care of the measuring sensor when cleaning the device.
• Do not use any harsh cleaning products.
• Always observe all safety notes for user and device.
Safety notes w Page 21.

Clean the measuring sensor after each use. Use a clean cloth or cotton bud that can be
moistened with disinfectant or 70 % alcohol. To clean the entire device, please use a soft cloth slightly moistened with a mild soapy solution. Under no circumstances may liquid enter the device. Do not use the device again until it is completely dry.

11. Storing the device

The device must not be stored or used at an excessively high or low temperature or humidity (see technical specifications), in sunlight, in association with an electrical current or in dusty locations. Otherwise inaccuracies can occur. If prolonged storage is planned, you should remove the batteries.

12. Disposing of the device
For environmental reasons, do not dispose of the device in the household waste at
the end of its useful life. Dispose of the unit at a suitable local collection or recycling
point. Dispose of the device in accordance with EC Directive – WEEE (Waste Electrical
and Electronic Equipment). If you have any questions, please contact the local
authorities responsible for waste disposal.

13. Technical Data
If the device is used other than in accordance with the specifications, perfect functioning cannot be guaranteed! The accuracy of this thermometer has been carefully checked and developed with regard to a long useful life.
If using the device for commercial medical purposes, it must be regularly tested for accuracy by appropriate means. Precise instructions for checking accuracy may be requested from the service address. We reserve the right to make technical changes to improve and develop the product.

 Technical Data

14. Guidelines
This device complies with the EU Directive 93/42/EC concerning medical products, the Medizinproduktegesetz, the ASTM E 1965 – 98 and the European Standard EN60601-1-2 and is subject to particular precautions with regard to electromagnetic compatibility.

15. Included in delivery
• Clinical thermometers
• 2 x AAA (LR03) batteries
• Storage box
• Instructions for use

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1 Comment

  1. The batteries LRO3 AAA were left for long in the device FT 90 beurer thermometer. Now after new duracell batteries were fixed, the device wont come on at all. What can still be done to make the device work ???

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