Microlife BP 3BU1-4 Blood Pressure Monitor User Manual

The Microlife BP 3BU1-4 is an automatic upper arm blood pressure monitor designed for home use. It features a large, easy-to-read LCD display, one-touch operation, irregular heartbeat detection, 2-user memory with 99 measurements each, WHO blood pressure classification indicator, and an adjustable cuff for arm circumferences 22-42 cm. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Package Contents 3. Device Overview 4. Specifications 5. Before First Use 6. Taking a Measurement 7. Memory Function 8. Understanding Results 9. Care & Cleaning 10. Battery Information 11. Troubleshooting

Features at a Glance

Key components: Main unit, adjustable arm cuff, instruction manual, storage case, and batteries.

Feature	Description
One-Touch Operation	Automatic inflation and measurement
WHO Classification Indicator	Color-coded display of blood pressure levels
2 x 99 Memory	Stores readings for two users separately
Irregular Heartbeat Detection (IHD)	Detects and indicates irregular heartbeats during measurement
Large LCD Display	Easy-to-read results with date and time
Adjustable Cuff	Fits arm circumferences 22-42 cm (9-16.5 inches)
Automatic Power Off	Conserves battery life
Average of Last 3 Readings	Calculates and displays average for each user
Date & Time Stamp	Records measurement date and time
Error Detection	Alerts for incorrect cuff placement or movement

Package Contents

Unpack and verify all items are present.

Microlife BP 3BU1-4 Blood Pressure Monitor (main unit)
Adjustable upper arm cuff
Instruction manual (this document)
Storage case
4 x AA batteries (1.5V)

WARNING! Do not use if any components are damaged. Contact customer support.

Device Overview

Front Panel: START/STOP button, MEMORY button, USER 1/USER 2 selection button, LCD display.

Display Symbols: Systolic pressure, Diastolic pressure, Pulse rate, User indicator, Battery low, Irregular heartbeat symbol, WHO classification bar, Date/Time, Memory recall number.

Cuff: Marked with artery index line for proper positioning.

Specifications

Measurement Method: Oscillometric
Measurement Range: Pressure: 0-299 mmHg, Pulse: 40-199 beats/min
Accuracy: Pressure: ±3 mmHg, Pulse: ±5% of reading
Memory: 2 users x 99 measurements
Cuff Size: 22-42 cm (9-16.5 inches)
Power Supply: 4 x 1.5V AA batteries or optional AC adapter
Operating Conditions: 10°C to 40°C, 15% to 90% relative humidity
Storage Conditions: -20°C to 60°C, ≤93% relative humidity
Dimensions: Approx. 123mm (W) x 85mm (H) x 141mm (D)
Weight: Approx. 300g (without batteries)

Before First Use

Prepare the device for initial measurement.

Insert batteries: Open battery compartment, insert 4 AA batteries observing polarity.
Set date and time: Press and hold MEMORY button for 3 seconds, use START/STOP to adjust.
Select user: Press USER button to choose USER 1 or USER 2.
Apply cuff: Wrap cuff on bare upper arm, align artery marker with brachial artery.

CAUTION! Ensure cuff is snug but not too tight. Rest for 5 minutes before measuring.

Taking a Measurement

For accurate results, follow these steps carefully.

Sit comfortably with back supported and feet flat on floor.
Place cuff on left arm at heart level (arm resting on table).
Press START/STOP button. Device will inflate automatically.
Remain still and quiet during measurement.
Results display automatically with systolic, diastolic, and pulse rate.
Device deflates and stores reading automatically.
To turn off, press START/STOP again or wait for auto power-off.

Tip: Take measurements at same time each day for consistent tracking.

Memory Function

View and manage stored measurements.

Select user: Press USER button to choose USER 1 or USER 2.
Recall memory: Press MEMORY button to scroll through stored readings.
View average: After third reading, average of last 3 measurements displays automatically.
Delete memory: Press and hold MEMORY button for 5 seconds while in memory mode to clear current user's data.

Note: Memory is preserved when batteries are removed.

Understanding Results

WHO classification bar on display indicates blood pressure category.

Color Zone	Category	Systolic (mmHg)	Diastolic (mmHg)
Green	Optimal	< 120	< 80
Yellow	Normal	120-129	80-84
Orange	High Normal	130-139	85-89
Red	Hypertension	≥ 140	≥ 90

Irregular Heartbeat Symbol: If displayed, measurement may be affected by arrhythmia. Repeat measurement.

Important: This device is for home monitoring only. Consult healthcare professional for diagnosis.

Care & Cleaning

Remove batteries before cleaning. Use slightly damp cloth with mild detergent. Do not immerse in water.

CAUTION! Do not use alcohol, benzene, or abrasive cleaners. Store in case when not in use.

Battery Information

Battery life: Approximately 500 measurements (alkaline batteries).

Replace when battery symbol appears on display.
Remove batteries if device not used for extended period.
Use only 1.5V AA alkaline batteries.
Optional AC adapter: DC 6V, 500mA (center positive).

WARNING! Do not mix old and new batteries. Dispose of batteries properly.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No display	Dead batteries	Replace all 4 batteries with new ones.
Error Code E1	Cuff not properly attached	Check cuff connection to device.
Error Code E2	Measurement error	Ensure cuff is at heart level; remain still; repeat measurement.
Error Code E3	Irregular heartbeat detected	Wait 5 minutes and measure again. If persistent, consult doctor.
Inaccurate reading	Wrong cuff position	Align artery marker with brachial artery; cuff should be snug.
Memory not working	Wrong user selected	Press USER button to select correct user profile.
Device turns off during use	Low batteries	Replace batteries immediately.

Reset: Remove batteries for 1 minute to reset device.

Service: For technical support, contact Microlife customer service or visit www.microlife.com