microlife BP W90 Automatic Wrist Blood Pressure Monitor User Guide

microlife BP W90 Automatic Wrist Blood Pressure Monitor User Guide & troubleshooting

microlife BP W90 Automatic Wrist Blood Pressure Monitor User Guide  & troubleshooting 1

microlife BP W90 Automatic Wrist Blood Pressure Monitor

microlife BP W90 Automatic Wrist Blood Pressure Monitor User Guide  & troubleshooting 2OVERVIEW

  • ON/OFF button
  • Display
  • Battery Compartment
  • Cuff
  • M-button (memory)
  • Time Buttonmicrolife BP W90 Automatic Wrist Blood Pressure Monitor User Guide  & troubleshooting 3


  • Systolic Value
  • Diastolic Value
  • Pulse Rate AT
  • Date/Time
  • Alarm Time
  • Stored Value
  •  Irregular Heartbeat (IHB) Symbol
  • Pulse
  • Battery Display
  •  User 1
  •  User 2microlife BP W90 Automatic Wrist Blood Pressure Monitor User Guide  & troubleshooting 4

Read the instructions carefully before using this device.

Intended use:
This oscillometric blood pressure monitor is intended for measuring non-invasive blood pressure in people aged 12 years or older.
Dear Customer,
Your new Microlife blood pressure monitor is a reliable medical device for taking measurements on the wrist. It is simple to use, accurate and comes highly recommended for blood pressure monitoring in your home. This device was developed in collaboration with physicians and clinical tests prove its measurement accuracy to be very high.*
If you have any questions, problems, or want to order spare parts please contact your local Microlife-Customer Service. Your dealer or pharmacy will be able to give you the address of the Microlife dealer in your country. Alternatively, visit the internet at www.microlife.com where you will find a wealth of invaluable information on our products. Stay healthy – Microlife AG!
* This device uses the same measuring technology as the highly decorated «BP 3BZ1-3» model tested according to the British and Irish Hypertension Society (BIHS) protocol.

Important Facts about Blood Pressure and Self-Measurement

  •  Blood pressure is the pressure of the blood flowing in the arteries generated by the pumping of the heart. Two values, the systolic (upper) value and the diastolic (lower) value, are always measured.
  •  The device indicates the pulse rate (the number of times the heart beats in a minute).
  •  Permanently high blood pressure values can damage your health and must be treated by your doctor!
  •  Always discuss your values with your doctor and tell him/her if you have noticed anything unusual or feel unsure. Never rely on single blood pressure readings.
  •  A number of factors can affect the accuracy of measure-ments taken on the wrist. In some cases, the result may differ from the measurement taken on the upper arm. We therefore advise you to compare these values with those produced by the upper arm measurement and discuss them with your doctor.
  •  Enter your readings in the enclosed blood pressure diary. This will give your doctor a quick overview.
  •  There are many causes of excessively high blood pressure values. Your doctor will explain them in more detail and offer treatment where appropriate. Besides medication, relaxation techniques, weight loss, and exercise can also lower your blood pressure.
  •  Under no circumstances should you alter the dosages of drugs or initiate treatment without consulting your doctor.
  •  Depending on physical exertion and condition, blood pressure is subject to wide fluctuations as the day progresses. You should therefore take your measurements in the same quiet conditions and when you feel relaxed! Take at least two measurements per day, one in the morning and one in the evening.
  •  It is quite normal for two measurements taken in quick succession to produce significantly different results.
  •  Deviations between measurements taken by your doctor or in the pharmacy and those taken at home are quite normal, as these situations are completely different.
  • Several measurements provide a much clearer picture than just one single measurement.
  •  Leave a small break of at least 15 seconds between two measurements.
  •  If you are pregnant, you should monitor your blood pressure regularly as it can change drastically during this time.
  •  If you suffer from a cardiac arrhythmia consult with your doctor before using the device. See also chapter «Appearance of the Irregular Heartbeat (IHB) Symbol» of this user manual.

The pulse display is not suitable for checking the frequency of heart pacemakers!

How do I evaluate my blood pressure?

Table for classifying blood pressure values in adults in accordance with the World Health Organisation (WHO) in 2003. Data in mmHg







1. blood pressure normal < 120 < 80 Self-check
2. blood pressure normal 120 – 129 80 – 84 Self-check
3. blood pressure slightly high 130 – 139 85 – 89 Consult your doctor
4. blood pressure too high 140 – 159 90 – 99 Seek medical advice
5. blood pressure far too high 160 – 179 100 – 109 Seek medical advice
6. blood pressure dangerously high ≥180 ≥110 Urgently seek medical advice!

The higher value is the one that determines the evaluation. For example: a readout value between 150/85 or 120/98 mmHg indicates «blood pressure too high».

Using the Device for the First Time

Activating the fitted batteries
Pull out the protective strip from the battery compartment 3.
Setting the date and time

  • After the new batteries are fitted, the year number flashes in the display. You can set the year by pressing the M-button 5. To confirm and then set the month, press the time button 6.
  • Press the M-button to set the month. Press the time button to confirm and then set the day.
  • Follow the instructions above to set the day, hour and minutes. Once you have set the minutes and pressed the time button, the date and time are set and the time is displayed.
  • If you want to change the date and time, press and hold the time button down for approx. 3 seconds until the year number starts to flash. Now you can enter the new values as described above.

 Taking a Blood Pressure Measurement

Checklist for taking a reliable measurement

  • Avoid activity, eating, or smoking immediately before the measurement.
  •  Sit down on a back-supported chair and relax for 5 minutes. Keep the feet flat on the floor and do not cross your legs.
  • Always measure in a sitting position and on the same wrist. Use the wrist which usually shows higher blood pressure values.
  •  Remove any items of clothing and your watch, for example, so that your wrist is free.
  •  Always ensure that the cuff is positioned correctly, as shown in the pictures illustrated on the short instruction card.
  • Fit the cuff comfortably but not too tight. The cuff will cover a wrist circumference of 13.5 to 21.5 cm (5.25 – 8.5 inches).
    Support your arm in a relaxed position and ensure that the device is at the same height as your heart.
  •  Press the ON/OFF button 1 to start the measurement.
  •  The cuff will now pump up automatically. Relax, do not move and do not tense your arm muscles until the measurement result is displayed. Breathe normally and do not talk.
  •  When the correct pressure is reached, the pumping stops and the pressure falls gradually. If the required pressure was not reached, the device will automatically pump some more air into the cuff.
  •  During the measurement, the heart symbol AN flashes in the display and a beep sounds every time a heartbeat is detected.
  •  The result, comprising the systolic 7 and the diastolic 8 blood pressure and the pulse rate 9 is displayed and a long beep is heard. Note also the explanations on further display symbols in this booklet.
  • .Remove and switch off the monitor and enter the result in the enclosed blood pressure pass. (The monitor does switch off automatically after approx. 1 min.).
  • You can stop the measurement at any time by pressing the ON/OFF button (e.g. if you feel uneasy or an unpleasant pres-sure sensation).

 Appearance of the Irregular Heartbeat (IHB) Symbol

This symbol AM indicates that an irregular heartbeat was detected. In this case, the measured blood pressure may deviate from your actual blood pressure values. It is recommended to repeat the measurement

Information for the doctor in case of repeated appearance of the IHB symbol:

This device is an oscillometric blood pressure monitor that also measures the pulse during blood pressure measurement and indicates when the heart rate is irregular.

User Selection

This blood pressure monitor allows you to store the results for 2 individual users. In addition, there is a guest mode, in which the results are not stored.
Alternating between 2 users or the guest mode.

  1.  While the unit is switched off keep the time button 6 pressed for 3 seconds until the user symbol AP or AQ starts to flash.
  2. Press the M-button 5 to change between user 1, user 2, and the guest mode.
  3.  Confirm the selection by pressing the start button 1.

Data Memory

  • At the end of each measurement, this device automatically stores the result, including the date and time.
  • Viewing the stored values
  • Press the M-button 5 briefly, when the device is switched off. The display first shows «M» AL and then a value, e.g. «M 17». This means that there are 17 values in the memory. The device then switches to the last stored result.
  • Pressing the M-button again displays the previous value. Pressing the M-button repeatedly enables you to move from one stored value to another.
  • The user symbol AP or AQ indicates which user’s memory is being displayed. To change the user, please follow the instructions above.
  •  In the guest mode, no memories are stored or displayed. Memory full
  •  Pay attention that the maximum memory capacity of 99 memories per user is not exceeded. When the 99 memory is full, the oldest value is automatically overwritten with the 100th value. Values should be evaluated by a doctor before the memory capacity is reached otherwise data will be lost.

Clearing all values of an individual user
The following procedure applies to the selected user (AP or AQ). If you are sure that you want to permanently remove all stored values, hold down the M-button (the device must have been switched off beforehand) until «CL» appears and then release the button. To permanently clear the memory, press the M-button while «CL» is flashing. Individual values cannot be cleared.
How not to store a reading
As soon as the reading is displayed press and hold the ON/OFF button 1 until «M» AL is flashing. Confirm to delete the reading by pressing the M-button 5.

Setting the Alarm Function

This device allows you to set 2 alarm times at which an alarm signal will then be triggered. This can be a useful aid, for instance as a reminder to take medication.

  1. To set an alarm time, press the time button 6 (the device must have been switched off beforehand) and immediately afterward the M-button 5 and hold both down until the bell symbol AK appears in the top left of the display. Then release both buttons. The flashing «1» in the display indicates that the first alarm time can now be set.
  2.  Press the time button to set the hours – the hour display flashes and pressing the M-button allows you to set the alarm hour. To confirm, press the time button.
  3.  The minute display will now flash. The minutes can be set using the M-button. To confirm, press the time button again.
  4. The bell symbol will now flash. Use the M-button to select whether the alarm time is to be active (bell) or inactive (crossed-out bell). To confirm, press the time button.
    • To set a second alarm time, proceed as above but if the «1» flashes, press the M-button to select «2» and confirm with the time button.
    • An active alarm time is indicated by the bell symbol in the display.
    • The alarm will sound at the set time every day.
    • To switch off the alarm when it is sounding, press the ON/OFF button 1.

 Battery Indicator and Battery change

Low battery
When the batteries are approximately ¾ empty the battery symbol AO will flash as soon as the device is switched on (partly filled battery displayed). Although the device will continue to measure reliably, you should obtain replacement batteries.
Flat battery – replacement
When the batteries are flat, the battery symbol AO will flash as soon as the device is switched on (flat battery displayed). You cannot take any further measurements and must replace the batteries.

  1.  Open battery compartment 3 by pulling off the cap.
  2. Replace the batteries – ensure correct polarity as shown by the symbols in the compartment.
  3.  To set a date and time, follow the procedure

The memory retains all values although date and time (and possibly also set alarm times) must be reset – the year number, therefore, flashes automatically after the batteries are replaced.

Which batteries and which procedure?

  •  Use 2 new, long-life 1.5 V, size AAA alkaline batteries.
  • Do not use batteries beyond their date of expiry.
  •  Remove batteries if the device is not going to be used for a prolonged period.

Using rechargeable batteries
You can also operate this device using rechargeable batteries.

Only use «NiMH» type reusable batteries.
Batteries must be removed and recharged when the flat battery symbol appears. They should not remain inside the device as they may become damaged (total discharge as a result of low use of the device, even when switched off).

  • Always remove the rechargeable batteries if you do not intend to use the device for a week or more.
  •  Batteries cannot be charged in the blood pressure monitor. Recharge batteries in an external charger and observe the information regarding charging, care, and durability.

 Error Messages

If an error occurs during the measurement, the measurement is interrupted and an error message, e.g. «ERR 3», is displayed.

Error Description Potential cause and remedy
«ERR 1» Signal too weak The pulse signals on the cuff are too weak. Re-position the cuff and repeat the measurement.*
«ERR 2» Error signal During the measurement, error signals were detected by the cuff, caused for instance by movement or muscle tension. Repeat the measurement, keeping your arm still.
«ERR 3» No pressure in the cuff An adequate pressure cannot be generated in the cuff. A leak may have occurred.

Check that the cuff is correctly connected and is not too loose. Replace the batteries if necessary. Repeat the measurement.

«ERR 5» Abnormal result The measuring signals are inaccurate and no result can therefore be displayed. Read through the checklist for performing reliable measurements and then repeat the measurement.*
Error Description Potential cause and remedy
«HI» Pulse or cuff pressure too high The pressure in the cuff is too high (over 299 mmHg) OR the pulse is too high (over 200 beats per minute). Relax for 5 minutes and repeat the measurement.*
«LO» Pulse too low The pulse is too low (less than 40 beats per minute). Repeat the measurement.*

* Please immediately consult your doctor, if this or any other problem occurs repeatedly.

If you think the results are unusual, please read through the information in «Section 1.» carefully.

Safety, Care, Accuracy Test and Disposal

Safety and protection

  • 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 may only be used for the purposes described in these instructions. The manufacturer cannot be held liable for damage caused by the incorrect application.
  • This device comprises sensitive components and must be treated with caution. Observe the storage and operating conditions described in the «Technical Specifications» section.
  • Protect it from:
    • water and moisture
    • extreme temperatures
    • impact and dropping
    • contamination and dust
    • direct sunlight
    • heat and cold
  • The cuffs are sensitive and must be handled with care.
  •  Only pump up the cuff once fitted.
  •  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. Do not use this device if you think it is damaged or notice anything unusual.
  • Never open this device
  •  If the device is not going to be used for a prolonged period the batteries should be removed
  • Read the additional safety information provided within the individual sections of this instruction manual
  • The measurement results given by this device is not a diagnosis. It is not replacing the need for the consultation of a physician, especially if not matching the patient’s symptoms. Do not rely on the measurement result only, always consider other potentially occurring symptoms and the patient’s feedback. Calling a doctor or an ambulance is advised if needed.
  • 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.

Device care
Clean the device only with a soft, dry cloth.
Cleaning the cuff
Carefully remove any marks on the cuff with a damp cloth and mild detergent.
Accuracy test
We recommend this device is tested for accuracy every 2 years or after mechanical impact (e.g. being dropped). Please contact your local Microlife-Service to arrange the test (see foreword).

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


This device is covered by a 5-year 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: Batteries.

The cuff is covered by a functional guarantee (bladder tightness) for 2 years.
Should guarantee service to 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:
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 the guarantee does not prolong or renew the guarantee period. The legal claims and rights of consumers are not limited by this guarantee.

Technical Specifications

  • Operating conditions:  10 – 40 °C / 50 – 104 °F 15 – 95 % relative maximum humidity
  • Storage conditions: -20 – +55 °C / -4 – +131 °F
  • Weight:15 – 95 % relative maximum humidity 140 g (including batteries)
  • Dimension: 68 x 68 x 70 mm
  • Cuff size:13.5 – 21.5 cm (5.25 – 8.5 inches)
  • Measuring procedure: oscillometric, corresponding to Korotkof
  •  method: Phase I systolic, Phase V diastolic
  • Measurement range:   20 – 280 mmHg – blood pressure
  • Cuff pressure display:  40 – 200 beats per minute – pulse
  • range: 0 – 299 mmHg
  • Resolution:1 mmHg
  • Static accuracy: pressure within ± 3 mmHg
  • Pulse accuracy: ± 5 % of the readout value
  • Voltage source: 2 x 1.5 V alkaline batteries; size AAA
  • Battery lifetime: approx.460 measurements (using new batteries)
  • IP Class: IP20
  • Reference to: EN 1060-1 /-3 /-4; IEC 60601-1;
  • standards: IEC 60601-1-2 (EMC); IEC 60601-1-11
  • Expected service life: Device: 5 years or 10000 measurements

Accessories: 2 years
This device complies with the requirements of the Medical Device Directive 93/42/EEC.
Technical alterations reserved.


Setting up microlife BP W90 Automatic Wrist Blood Pressure Monitor User Guide is easy with these step-by-step instructions. Follow the steps are you are set-up in no time.

Using microlife BP W90 Automatic Wrist Blood Pressure Monitor User Guide is simple by using this manual. Follow the instructions one by one and everything will be fine

Is microlife BP W90 Automatic Wrist Blood Pressure Monitor User Guide stuck or not working properly? By resetting it you can set it back to the standard settings and everything should be back to normal. This works in many cases when problems arise.

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