microlife MT 850 Digital Thermometer Instruction Manual

: June 6, 2024
: microlife

Table of Contents

MT 850 Digital Thermometer
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MT 850 Digital Thermometer

Thermometer

Description of this Thermometer

Multifunction button
Display
Battery compartment cover
Measuring sensor / measuring tip
Body mode
Water bath mode
Ambient mode
Cleaning and disinfecting area (entire thermometer surface)

Important Safety Instructions

Follow instructions for use. This document provides important product operation and safety information regarding this device. Please read this document thoroughly before using the device and keep for future reference.
This device is only to be used for measuring human body temperature through oral, rectal or axillary. Do not attempt to take temperatures at other sites, such as in the ear, as it may result in false readings and may lead to injury.
Do not use this device if you think it is damaged or notice anything unusual.
We recommend cleaning this device according to the cleaning instructions before first use for personal hygiene.
The minimum measurement time until the beep is heard must be maintained without exception! Consider that different measurement locations may require continued measuring even after the beep, see section «Measuring methods / Normal body temperature».
Do not attempt rectal measurements on persons with rectal disorders. Doing so may aggravate or worsen the disorder.
Ensure that children do not use this device unsupervised; some parts are small enough to be swallowed. Be aware of the risk of strangulation in case this device is supplied with cables or tubes.
Do not use this device close to strong electromagnetic fields such as mobile telephones or radio installations. Keep a minimum distance of 3.3 m from such devices when using this device.
Protect the device from impact and dropping!
Avoid bending the thermometer probe more than 45°!
Avoid ambient temperatures above 60 °C. NEVER boil this device!
Use only the commercial disinfectants listed in the section «Cleaning
and Disinfecting» to clean the device to avoid damage to the device.
We recommend this device is tested for accuracy every two years or
after mechanical impact (e.g. being dropped). Please contact your local Microlife-Service to arrange the test.

WARNING: The measurement result given by this device is not a diagnosis! Do not rely on the measurement result only.

Batteries and electronic devices must be disposed of in accordance with the locally applicable regulations, not with domestic waste.

Read the instructions carefully before using this device.

Type BF applied part

Turning on the Thermometer

To turn on the thermometer, press the multifunction button 1; a short beep signals «thermometer ON» and a red and green backlight lights up. A display test is performed. All segments should be displayed.

Function Test

Correct functioning of the thermometer is tested automatically each time it is turned on. If a malfunction is detected (measurement inaccuracy), this is indicated by «Err» on the display, and a measurement becomes impossible. In this case, the thermometer must be replaced.

Select the Measuring Mode
Press the multifunction button 1 to select the desired mode; the device will set up the chosen mode if there is no switch within 3 seconds. After the mode selection is completed, the thermometer is ready for use.

Using the Thermometer

Measuring in body mode 5

The last measurement reading will be shown on the display 2 automatically for 2 seconds with the «M» icon. Then at an ambient temperature of less than 34 °C, «– -» and «°C» appear on the display field 2. The thermometer is ready for use now. Choose the preferred measuring method. When taking a measurement, the current temperature is continuously displayed and flashes. If a long beep is heard and the displayed temperature is no longer flashing, the predictive end- temperature has been determined and the thermometer can be read now. 4 short beeps and a red LCD backlight alert the patient that he/she may have a temperature equal to or higher than 37.5 °C. Reference: Oral temperature. To achieve comparable results allow a 1 minute interval time between measurements.

Measuring in water bath mode 6

The temperature will be displayed continuously without backlight when the temperature is between 5 – 50 °C.
Measuring in ambient mode 7 The temperature will be displayed continuously without backlight when the temperature is between -10 – +50 °C. To prolong the battery life, turn off the thermometer by briefly pressing the multifunction button 1. Otherwise the thermometer will automatically turn off after about 5 minutes.
Measuring methods / Normal body temperature
In the armpit (axillary) / 34.7 – 37.3 °C Wipe the underarm with a dry towel. Place the measuring sensor 4 under the arm into the center of the armpit so the tip is touching the skin and position the patient’s arm next to the patient’s body. This ensures that the room air does not affect the reading. Because the axillary takes more time to reach its stable temperature wait at least 5 minutes, regardless of the beep sound.
In the mouth (oral) / 35.5 – 37.5 °C Do not eat or drink anything hot or cold 10 minutes before the measurement. The mouth should remain closed up to 2 minutes before starting a reading. Position the thermometer in one of the two pockets under the tongue, to the left or right of the root of the tongue. The measuring sensor 4 must be in good contact with the tissue. Close your mouth and breathe evenly through the nose to prevent the measurement from being influenced by inhaled/exhaled air. If this is not possible due to blocked airways, another method for measuring should be used. Approx. measuring time: 8 seconds!
In the anus (rectal) / 36.6 – 38.0 °C Carefully insert the measuring sensor 4 of the thermometer 2 to 3 cm into the anal aperture. The use of a probe cover and the use of a lubricant is recommended. If you are unsure of this measurement method, you should consult a professional for guidance/training. Approx. measuring time: 8 seconds!
Cleaning and Disinfecting
For disinfection in home use environment, use a 70% Isopropyl alcohol swab or a cotton tissue moistened with 70% Isopropyl alcohol to wipe surface pollutants off the thermometer probe. Always start wiping from the end of the thermometer probe (approx. at the middle of the thermometer) towards the thermometer tip. Afterwards the entire thermometer (see number 8 in the drawing) should be immersed in 70% Isopropyl alcohol for at least 5 minutes (max. 24 hours). After immersion, let the disinfectant dry off for 1 minute before next use.
For professional use: You may apply probe covers (available as accessory). Contact Microlife for further details concerning suitable disinfectants for your thermometer model. Battery Replacement
The battery needs replacing, when only the «battery»-symbol appears on the display. Remove the battery compartment cover 3 from the thermometer, to replace the battery. Insert the new battery with the + at the top. Make sure you have a battery of the same type to hand. Batteries can be purchased at any electrical store.

Technical Specifications

Type: Maximum thermometer

Measurement range: Body mode: 32 – 43.9 °C Temp. < 34.0 °C: display «– -» for low (too low) Temp. > 43.9 °C: display «H» for high (too high) Water bath mode: 5 – 50 °C Temp. < 5 °C: display «L» for low (too low) Temp. > 50 °C: display «H» for high (too high) Ambient mode: -10 – +50 °C Temp. < -10 °C: display «Err» for low (too low) Temp. > 50 °C: display «H» for high (too high)

Measurement accuracy: Body mode: ± 0.1 °C between 32 – 43.9 °C Water bath mode: ± 1 °C between 5 – 50 °C Ambient mode: ± 1 °C between -10 – +50 °C

Operating conditions: 10 – 40 °C; 15-95 % relative maximum humidity

Storage conditions: -25 – +60 °C; 15-95 % relative maximum humidity
Battery: 3V; CR1632
Battery lifetime: approx. 2000 measurements (using a new battery)
IP Class: IP67
Reference to standards: EN 12470-3, clinical thermometers; ASTM E1112; IEC 60601-1; IEC 60601-1-2 (EMC); IEC 60601-1-11

Expected service life: 5 years or 10000 measurements

This device complies with the requirements of the Medical Device Directive 93/42/EEC. Technical alterations reserved.

Guarantee

This device is covered by a lifetime guarantee from the date of

purchase. During this guarantee period, at our discretion, Microlife will

repair or replace the defective product free of charge.

Opening or altering the device invalidates the guarantee.

The following items are excluded from the guarantee:

Transport costs and risks of transport.

Damage caused by incorrect application or non-compliance with the

instructions for use.

Damage caused by leaking batteries.

Damage caused by accident or misuse.

Packaging/storage material and instructions for use.

Regular checks and maintenance (calibration).

Accessories and wearing parts: Battery.

Should guarantee service be required, please contact the dealer from

where the product was purchased, or your local Microlife service. You

may contact your local Microlife service through our website:

www.microlife.com/support

Compensation is limited to the value of the product. The guarantee will

be granted if the complete product is returned with the original invoice.

Repair or replacement within guarantee does not prolong or renew the guarantee period. The legal claims and rights of consumers are not limited by this guarantee.