Microlife BP3AX1-4U Blood Pressure Monitor User Manual

The Microlife BP3AX1-4U is an automatic upper arm blood pressure monitor with clinically validated accuracy, featuring a large LCD display, one-touch operation, irregular heartbeat detection, hypertension indicator, 2-user memory with 99 readings each, date and time display, automatic averaging of the last 3 readings, and a wide-range D-ring cuff (22-42 cm). It is powered by 4 AA batteries or an optional AC adapter. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Safety Information 3. Package Contents 4. Device Overview 5. Initial Setup 6. Taking a Measurement 7. Memory Function 8. Understanding the Results 9. Care & Maintenance 10. Specifications 11. Troubleshooting

Features at a Glance

Key components: Main unit with LCD display, Wide-range D-ring cuff, AC adapter port, Battery compartment, START/STOP button, MEMORY button.

Feature	Description
One-Touch Operation	Automatic inflation and deflation with single button press
Clinically Validated	Meets international accuracy standards (e.g., ESH, AAMI)
Irregular Heartbeat Detection (IHD)	Detects pulse irregularities during measurement
Hypertension Indicator	Displays color-coded bar according to WHO classification
2 x 99 Memory	Stores 99 readings for each of two users
Automatic 3-reading Average	Calculates average of last three consecutive readings
Date & Time Stamp	Records measurement date and time for tracking
Large LCD Display	Easy-to-read backlit screen with clear icons
Wide-Range Cuff (22-42 cm)	Fits standard to large adult arms
Power Options	4 AA batteries or optional AC adapter (DC 6V)

Safety Information

Read all instructions before use. For personal home use only.

Do not use on infants, children, or persons unable to express themselves.
Consult your physician before use if you have arrhythmia, pre-eclampsia, or other circulatory disorders.
Do not use the device on an injured or IV arm.
Remain still and quiet during measurement; do not talk.
Wait at least 5 minutes between consecutive measurements on the same person.

WARNING! This device is not a substitute for professional medical diagnosis. Consult your doctor for interpretation of results and treatment decisions.

Package Contents

Microlife BP3AX1-4U Blood Pressure Monitor (Main Unit)
Wide-Range Upper Arm Cuff (22-42 cm)
Instruction Manual (this document)
4 x AA Batteries
Storage Case
Note: AC adapter sold separately.

CAUTION! Inspect contents upon unpacking. Do not use if any part appears damaged.

Device Overview

Front Panel: LCD Display, START/STOP Button, MEMORY Button, User Selector Icon (U1/U2).

Display Symbols: Systolic Pressure, Diastolic Pressure, Pulse Rate, User Icon (U1/U2), Battery Indicator, Irregular Heartbeat Symbol ( ), Hypertension Indicator Bar, Memory Full Icon, Date/Time, Average Icon.

Side/Back: AC Adapter Socket, Cuff Tube Connector, Battery Compartment Cover.

Cuff: D-ring, Cloth wrap, Air tube, Artery marker (align with brachial artery).

Initial Setup

Insert Batteries: Open battery compartment on back, insert 4 AA batteries observing polarity. Close cover.
Set Date & Time: Press and hold MEMORY button for 3 seconds until year flashes. Use START/STOP to adjust values, MEMORY to confirm and move to next setting (Month, Day, Hour, Minute).
Select User: Press MEMORY briefly to toggle between User 1 (U1) and User 2 (U2). The active user icon will show on display.
Connect Cuff: Plug cuff tube firmly into the connector on the side of the device.

Tip: For most accurate results, use the AC adapter to conserve battery life during frequent use.

Taking a Measurement

For reliable readings, follow these steps carefully.

Prepare: Rest for 5 minutes before measuring. Avoid caffeine, exercise, and smoking for 30 minutes prior.
Apply Cuff: Sit comfortably with back supported and feet flat. Place cuff on bare upper arm. The bottom edge should be 2-3 cm above elbow. Align artery marker with inner arm. Secure snugly with D-ring.
Position Arm: Rest arm on a table so the cuff is at heart level. Palm facing up, relax your hand.
Start Measurement: Press START/STOP button. The cuff will inflate automatically. Remain still and quiet.
Read Results: After deflation, systolic, diastolic pressure, and pulse rate will display. The hypertension bar will show color zone. An irregular heartbeat symbol will appear if detected.
Power Off: Device turns off automatically about 1 minute after measurement.

WARNING! Do not inflate cuff when not wrapped around arm. Excessive pressure may cause injury.

Memory Function

The device stores the last 99 readings for each of two users, with date and time.

Recall Memory: Press MEMORY button once. The most recent reading for the selected user (U1/U2) displays. Press MEMORY repeatedly to scroll through older readings.
View Average: After the third consecutive reading (taken within 10 minutes), the display will automatically show the average of the last three readings for a few seconds.
Clear Memory: To clear memory for the current user, press and hold both START/STOP and MEMORY buttons for 3 seconds until "CLr" appears. Release buttons. Memory for the other user is retained.

Note: When memory is full, the oldest reading is automatically overwritten by the newest.

Understanding the Results

Display	Meaning	WHO Classification (Hypertension Bar)
SYS / DIA (e.g., 120/80)	Systolic/Diastolic Pressure in mmHg	Optimal (Green Zone)
Pulse (e.g., 72)	Heartbeats per minute (Pulse Rate)	Normal (Yellow Zone)
Symbol	Irregular Heartbeat Detected during measurement	Consult physician if frequent
Bar Graph (Colored)	Hypertension Indicator: Green (Normal), Yellow (Mild), Red (High)	Grade 1/2/3 Hypertension (Red Zone)
AVG Icon	Displayed with average of last 3 readings	More reliable than single reading

Important: Only a physician can diagnose hypertension. Take your logged readings to your doctor.

Care & Maintenance

Unplug AC adapter and remove batteries before cleaning.

Cleaning: Wipe device and cuff with a soft, slightly damp cloth. Do not immerse in water or use solvents.
Storage: Store in the provided case in a cool, dry place away from direct sunlight and extreme temperatures.
Cuff Care: Do not fold the cuff tightly or twist the air tube. Do not wash the cuff.
Batteries: Replace batteries when low battery icon appears. Remove batteries if device will not be used for a long time.

CAUTION! Do not attempt to disassemble or repair the device. There are no user-serviceable parts inside.

Specifications

Measurement Method: Oscillometric, automatic inflation/deflation.
Measurement Range: Pressure: 0-299 mmHg; Pulse: 40-199 beats/min.
Accuracy: Pressure: ±3 mmHg; Pulse: ±5% of reading.
Memory: 2 independent memories x 99 readings with date/time.
Cuff Size: 22 - 42 cm (arm circumference).
Power Supply: 4 x 1.5V AA batteries or DC 6V/500mA AC adapter.
Battery Life: Approx. 500 measurements (alkaline batteries).
Dimensions (Unit): Approx. 128mm (W) x 98mm (H) x 141mm (D).
Weight (Unit): Approx. 350g (without batteries).
Operating Conditions: 10°C to 40°C, 15% to 90% RH (non-condensing).

Troubleshooting

Symptom	Possible Cause	Corrective Action
No display	Dead batteries, incorrect installation	Replace batteries; ensure correct polarity.
Error Code "E" appears	Cuff not connected, air leak, movement	Check cuff connection; ensure cuff is snug; remain still and retry.
Inconsistent readings	Incorrect cuff position, talking/moving	Reposition cuff at heart level; ensure rest period; be still and quiet.
Symbol flashes	Irregular heartbeat detected	Take another measurement. If symbol appears frequently, consult your doctor.
Cuff does not inflate	Blocked tube, weak batteries	Check tube for kinks; replace batteries.
Memory not recalling	Wrong user selected, memory empty	Press MEMORY to select correct user (U1/U2). Ensure readings were saved.

Reset: Remove batteries and AC adapter for 1 minute, then reinstall.

Service: For technical support, contact Microlife USA: 1-888-710-8222 or visit www.microlife.com.