Microlife BP A90-30: instruction

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BP A90

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Display

Read the instructions carefully before using this device.

Type BF applied part

Dear Customer,

Your new Microlife blood pressure monitor is a reliable medical 

instrument for taking measurements on the upper arm. It is simple 

to use, accurate and comes highly recommended for blood pres-

sure monitoring in your home. This instrument was developed in 

collaboration with physicians and clinical tests proving its 

measurement accuracy to be very high.* 

Please read through these instructions carefully so that you under-

stand all functions and safety information. We want you to be 

happy with your Microlife product. If you have any questions, prob-

lems or want to order spare parts, please contact Microlife-

Customer Service. Your dealer or pharmacy will be able to give 

you the address of the Microlife dealer in your country. Alterna-

tively, visit the Internet at www.microlife.com where you will find a 

wealth of invaluable information on our products.

Stay healthy – Microlife AG!

* This instrument uses the same measuring technology as the 

award winning «BP 3BTO-A» model tested according to the British 

Hypertension Society (BHS) protocol.

Table of Contents

1. Important Facts about Blood Pressure and Self-Measure-

ment

• How do I evaluate my blood pressure?

2. Using the Instrument for the First Time

• Inserting the batteries

• Selecting the correct cuff

3. Taking a Blood Pressure Measurement using this Instrument

4. Appearance of the Heart Arrhythmia Indicator for early 

Detection

5. Data Memory

• Viewing the stored values

• Memory full

• Clearing all values

Microlife BP A90

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1

ON/OFF Button

2

Display

3

Cuff Socket

4

Battery Compartment

5

Cuff

6

Cuff Connector

AO

M-Button (Memory)

7

Systolic Value

8

Diastolic Value

9

Pulse

AT

Pulse Rate

AK

Battery Display

AL

Stored Value

AM

Memory Number

AN

Heart Arrhythmia Indicator

2

6. Battery Indicator and Battery change

• Low battery

• Flat battery – replacement

• Which batteries and which procedure?

• Using rechargeable batteries

7. Error Messages

8. Safety, Care, Accuracy Test and Disposal

• Safety and protection

• Instrument care

• Accuracy test

• Disposal

9. Guarantee

10. Technical Specifications

Guarantee Card (see Back Cover)

1. 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 instrument also 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. 



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 treat-

ment 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 

any drugs prescribed by 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 condi-

tions and when you feel relaxed!

 Take at least two measure-

ments per day, one in the morning and one in the evening.



It is quite normal for two measurements taken in quick succes-

sion 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 

very closely as it can change drastically during this time! 



If you suffer from an 

irregular heartbeat

, measurements taken 

with this instrument should only be evaluated after consultation 

with your doctor.



The pulse display is not suitable for checking the 

frequency of heart pacemakers!

How do I evaluate my blood pressure?

The higher value is the one that determines the evaluation. 

Example: a readout value between 

150/85

 or 

120/98

 mmHg indi-

cates «blood pressure too high».

Table for classifying blood pressure values in adults in accordance 

with the World Health Organisation (WHO) in 2003. Data in mmHg.

Range

Systolic Diastolic Recommendation 

blood pressure too low



 100



 60

Consult your 

doctor

1. blood pressure 

optimum

100 - 120 60 - 80

Self-check

2. blood pressure normal

120 - 130 80 - 85

Self-check

3. blood pressure slightly 

high

130 - 140 85 - 90

Consult your 

doctor

4. blood pressure too 

high

140 - 160 90 - 100

Seek medical 

advice

5. blood pressure far too 

high

160 - 180 100 - 110

Seek medical 

advice

6. blood pressure 

dangerously high

180 



110 



Urgently seek 

medical advice!

3

BP A90

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2. Using the Instrument for the First Time

Inserting the batteries

After you have unpacked your device, first insert the batteries. The 

battery compartment 

4

 is at the back of the device. Insert the 

batteries (4 x size AA 1,5 V), thereby observing the indicated polarity.

Selecting the correct cuff

Microlife offers different cuff sizes. Select the cuff size to match the 

circumference of your upper arms (measured by close fitting in the 

centre of the upper arm).



Optional preformed cuffs «Easy» are available.



Only use Microlife cuffs.



Contact Microlife Service if the enclosed cuff 

5

 does not fit.



Connect the cuff to the instrument by inserting the cuff 

connector 

6

 into the cuff socket 

3

 as far as it will go.

3. Taking a Blood Pressure Measurement using this 

Instrument

Checklist for taking a reliable measurement

1. Avoid activity, eating or smoking immediately before the 

measurement.

2. Sit down for at least 5 minutes before the measurement and relax.

3. Always measure on the same arm (normally left).

4. Remove close-fitting garments from the upper arm. To avoid 

constriction, shirt sleeves should not be rolled up - they do not 

interfere with the cuff if they are laid flat.

5. Always ensure that the correct cuff size is used (marking on the 

cuff).



Fit the cuff closely, but not too tight.



Make sure that the cuff is positioned 2 cm above the elbow.



The 

artery mark

 located on the cuff (ca. 3 cm long bar) must 

lie over the artery which runs down the inner side of the arm.



Support your arm so it is relaxed.



Ensure that the cuff is at the same height as your heart.

6. Press the ON/OFF button 

1

 to start the measurement.

7. 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.

8. When the correct pressure is reached, the pumping stops and the 

pressure falls gradually. If the required pressure was not reached, 

the instrument will automatically pump some more air into the cuff.

9. During the measurement, the heart symbol 

AT

 flashes in the 

display and a beep sounds every time a heartbeat is detected.

10.The result, comprising the systolic 

7

 and the diastolic 

8

 blood 

pressure and the pulse 

9

 is displayed and longer beep is heard. 

Note also the explanations on further displays in this booklet.

11.When the measurement has finished, remove the cuff.

12.Switch off the instrument. (The monitor does switch off auto-

matically 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 

pressure sensation). 

4. Appearance of the Heart Arrhythmia Indicator for 

early Detection 

This symbol 

AN

 indicates that certain pulse irregularities were 

detected during the measurement. In this case, the result may 

deviate from your normal blood pressure – repeat the measure-

ment. In most cases, this is no cause for concern. However, if the 

symbol appears on a regular basis (e.g. several times a week with 

measurements taken daily) we advise you to tell your doctor. 

Please show your doctor the following explanation:

Cuff size

for circumference of upper arm

S

17 - 22 cm (6.75 - 8.75 inches)

M

22 - 32 cm (8.75 - 12.5 inches)

L

32 - 42 cm (12.5 - 16.5 inches)

M - L

22 - 42 cm (8.75 - 16.5 inches)

Information for the doctor on frequent appearance of the 

Arrhythmia indicator

This instrument is an oscillometric blood pressure monitor that 

also analyses pulse frequency during measurement. The instru-

ment is clinically tested.

The arrhythmia symbol is displayed after the measurement, if 

pulse irregularities occur during measurement. If the symbol 

appears more frequently (e.g. several times per week on 

measurements performed daily) we recommend the patient to 

seek medical advice.

The instrument does not replace a cardiac examination, but 

serves to detect pulse irregularities at an early stage.