How to Use: Citizen CHUG330 Digital Blood Pressure Monitor Instruction Manual

Overview

The CHUG330 Digital Blood Pressure Monitor is an automatic, non-invasive upper-arm blood pressure monitor designed for home use. It uses the oscillometric method to measure systolic blood pressure, diastolic blood pressure, and pulse rate.

The monitor is intended for personal health tracking. Blood pressure readings should not be used to diagnose a condition, change treatment, or replace advice from a qualified healthcare professional.

Specifications

• Model: CHUG330
• Measurement method: Oscillometric
• Measurement location: Upper arm
• Standard cuff: SCN-012 soft cuff for arm circumferences of 22–32 cm (8-3/4–12-1/2 in)
• Optional large cuff: SCL-005 for arm circumferences of 32–42 cm (12-1/2–16-1/2 in)
• Pressure measurement range: 0–280 mmHg
• Pulse measurement range: 40–180 beats per minute
• Accuracy: Pressure ±3 mmHg; pulse ±5% of the displayed reading
• Power: Four 1.5 V AAA batteries, R03 or LR03
• Optional adapter: AC-230CZ, 6 V DC, 700 mA
• Battery life: Approximately 300 measurements with alkaline batteries or 150 measurements with manganese batteries
• Memory: 60 readings, with an automatic average of the most recent three readings
• Automatic shutoff: Approximately three minutes after activation
• Main unit dimensions: 110 × 47 × 104 mm
• Weight: Approximately 210 g without batteries; cuff approximately 130 g
• Operating conditions: 10–40°C, 15–85% relative humidity, and 700–1060 hPa atmospheric pressure
• Storage conditions: -20–60°C and 10–95% relative humidity
• Water protection: IPX0; keep the monitor and cuff away from water
• Applied part: Type BF cuff

Detailed Description

The monitor automatically inflates the cuff around the upper arm and detects pressure oscillations produced by the heartbeat. It then calculates and displays SYS, DIA, and pulse rate values on the digital screen.

The main unit includes the battery compartment, AC adapter socket, air hose socket, display, START/STOP button, and Memory button. The cuff has an air hose, air hose plug, metal loop, and hook-and-loop fastener.

The display can show the battery condition, date, time, systolic pressure, diastolic pressure, pulse rate, memory number, average reading, irregular heartbeat indicator, body movement indicator, memory icon, and WHO blood pressure classification indicator.

The package contains the monitor, SCN-012 cuff, four AAA batteries supplied for demonstration purposes, the instruction manual, and EMC technical information. The large cuff and AC-230CZ adapter are optional accessories.

Safety

Medical precautions

• Consult a physician before use if you have heart or cardiovascular disease, arrhythmia, arterial sclerosis, poor circulation, diabetes, pregnancy, preeclampsia, kidney disease, a weak pulse, a history of mastectomy, other circulatory conditions, or a cardiac pacemaker.
• Do not use the cuff on an injured arm or an arm receiving medical treatment.
• Never attach the cuff to an arm receiving an intravenous drip or blood transfusion.
• Do not use the monitor on infants or on anyone unable to communicate discomfort or intentions.
• Do not share the cuff with a person who has an infectious condition, because this may cause cross-infection.
• Do not use readings for self-diagnosis or self-treatment. Discuss results and treatment decisions with a physician.

Safe operation

• Use the device only for blood pressure measurement.
• Do not disassemble, repair, or modify the monitor or cuff.
• Do not measure repeatedly without a break. Wait at least several minutes before taking another reading.
• If you feel unwell during measurement, stop the process immediately by pressing START/STOP and remove the cuff if necessary.
• If the cuff does not begin to deflate, press START/STOP. If pressure remains, disconnect the air hose from the monitor and remove the cuff.
• Keep the air hose and any adapter cord away from infants and children to prevent accidental strangulation.
• Do not use the device near flammable anesthetic gases or in oxygen-enriched environments.
• Avoid using the monitor near mobile phones or other equipment that produces strong electromagnetic fields.
• If the irregular heartbeat indicator appears frequently, consult a physician.

Battery and adapter precautions

• If battery fluid contacts the eyes or skin, rinse immediately with water and seek medical attention.
• Replace all four batteries together when the low-battery icon appears or the display becomes blank.
• Use compatible alkaline, manganese, or nickel-metal hydride batteries, and do not mix battery types.
• When using mains power, use only the dedicated AC-230CZ adapter.
• Do not handle the adapter with wet hands or use it if the cord, plug, or outlet connection is damaged or loose.
• Keep the adapter plug free from dust and disconnect it by holding the plug rather than pulling the cable.
• Do not sharply bend, twist, bundle, or place excessive force on the adapter cord.

Setup and Operation

Install the batteries

1. Open the battery cover by placing a finger on the cover hook and pulling the cover toward you.
2. Insert four AAA batteries, placing the ends with the protruding springs against the negative terminals. Check the polarity markings carefully.
3. Fit the cover tabs into their recesses and press the cover closed until it clicks.
4. Set the clock after inserting the batteries if you want measurement results saved with their date and time.

Blood pressure measurement remains available even if the clock is not configured. Without a clock setting, stored results do not include date and time. Replacing the batteries does not erase stored measurements.

Use the AC adapter

Insert the AC-230CZ adapter plug into the monitor's adapter socket. To disconnect it, unplug the adapter from the outlet and then remove the plug from the main unit. Keeping batteries installed is recommended because removing adapter power without batteries resets the date and time, although stored readings remain preserved.

Set the date and time

1. Press and hold the Memory button for more than three seconds until the year begins flashing.
2. Press Memory to advance the year, then press START/STOP to confirm it.
3. Set the month, date, hour, and minute in the same way.
4. Choose either the 12-hour or 24-hour format.
5. Choose whether the clock remains displayed, then press START/STOP to save the setting.

To change the time later, press and hold Memory for more than three seconds and repeat the setting sequence.

Prepare for an accurate reading

• Use a cuff that matches your arm circumference.
• Empty your bladder before measuring if necessary.
• Take five or six slow, deep breaths and relax.
• Avoid measuring immediately after smoking, bathing, drinking alcohol, coffee, or tea, eating, or exercising.
• Measure in a room around 20°C (68°F). Avoid measurement below 10°C (50°F) or above 40°C (104°F).
• Measure at a consistent time each day when possible. Long-term patterns are more useful than one isolated result.

Attach the cuff

1. Insert the cuff's air hose plug into the air hose socket on the monitor.
2. Unroll the cuff and pass its end through the metal loop so the hook-and-loop fastening surface faces outward.
3. Place the cuff on a bare upper arm or over a thin sleeve. Do not place it over rolled-up clothing that constricts the arm.
4. Position the blue marker toward the palm side and centered along the arm.
5. Place the lower edge of the cuff 1–2 cm (0.4–0.8 in) above the elbow.
6. Pull the cuff end until it fits securely, then fasten it. A finger should slide readily between the cuff and the arm.
7. Use the same arm each day because readings can differ between the left and right arms.

Do not bend the air hose during measurement. A restricted hose can cause inflation errors or prolonged cuff pressure.

Take a measurement

1. Sit comfortably with both feet flat on the floor and do not cross your legs.
2. Rest your forearm on a table with your palm facing upward and your fingers relaxed.
3. Position the cuff at heart level.
4. Remain still and silent, then press START/STOP.
5. The monitor displays its startup segments and automatically inflates the cuff.
6. Wait while the pulse indicator flashes and the measurement is calculated.
7. When the cuff deflates, read the systolic pressure, diastolic pressure, and pulse rate on the display.
8. Press START/STOP to turn the monitor off, or allow it to switch off automatically after approximately three minutes.

To stop a measurement, press START/STOP. A manual inflation option is available by holding the button and releasing it at a pressure approximately 40 mmHg above the expected maximum blood pressure; the pressure limit is 280 mmHg.

Review stored results

1. Press Memory to display the average of the three most recent readings.
2. Press Memory repeatedly to move through stored results, from newer readings to older readings.
3. Press START/STOP to leave memory mode.

The monitor stores up to 60 results. A reading marked as unsuitable by the device is not included in the automatic average.

Delete results

To delete one reading, display it and hold the Memory button for at least four seconds. When “CL” stops flashing and remains lit, release the button.

To delete all readings, hold Memory while also holding START/STOP for at least four seconds. When “ALL CL” stops flashing and remains lit, release both buttons. Do not remove the batteries during either deletion process.

Display Indicators

• Irregular heartbeat indicator: Appears when an irregular rhythm is detected during measurement. Rest quietly and repeat the reading. Frequent appearances should be discussed with a physician.
• Body movement icon: Indicates that movement caused a significant pressure change during measurement. Repeat the test while remaining still and silent.
• WHO classification indicator: Places the result within the monitor's six displayed categories: optimal, normal, high-normal, grade 1 hypertension, grade 2 hypertension, or grade 3 hypertension.
• Battery icon: Indicates that the batteries need attention. Replace all four batteries together when required.
• Memory icon and number: Identify stored readings and their position in memory.

Cleaning and Maintenance

• Store the monitor away from direct sunlight, extreme temperatures, high humidity, and excessive dust.
• Keep the device out of reach of children, pets, and pests.
• Protect the monitor and cuff from drops, shocks, and vibration.
• Do not sharply fold the cuff or excessively bend the air hose.
• Remove the batteries if the monitor will remain unused for an extended period to reduce the risk of leakage damage.
• Do not wash or soak the cuff, and keep water out of the air hose.
• Do not use alcohol, thinner, or benzine on the monitor or cuff.
• For dirt, wipe the affected area with a cloth lightly moistened with neutral detergent, then dry it with a clean cloth.
• Professional inspection approximately every two years is recommended to help confirm proper operation and performance.
• Dispose of the monitor, cuff, and batteries according to applicable local recycling and waste regulations.

Troubleshooting

The monitor does not respond

Incorrect battery installation, depleted batteries, or strong electromagnetic interference may prevent operation. Remove the batteries, reinstall all four in the correct orientation, and replace them if necessary. Move the monitor away from sources of electromagnetic interference.

A measurement cannot be taken

Check that the air hose plug is fully inserted and that the cuff is correctly positioned and tightened. Make sure the arm is supported at heart level and repeat the measurement while relaxed.

No pulse is detected

Speaking, moving, or feeling tense can interfere with pulse detection. Repeat the test without talking or moving. The monitor may have difficulty measuring people with an extremely weak pulse or certain arrhythmias; consult a physician if this occurs.

The cuff does not fit or pressure remains high

Reattach the cuff correctly and verify that the selected cuff matches the arm circumference. If pressure exceeds 281 mmHg or does not fall automatically, press START/STOP and remove the cuff. If the monitor still behaves abnormally, discontinue use and arrange local service support.

The pulse is outside the measurement range

A pulse of 39 beats per minute or less, or 181 beats per minute or more, is outside the monitor's specified range. Relax, take a deep breath, confirm the cuff position, and try again. Seek medical advice when an unusual pulse persists or causes symptoms.

Pros & Cons

• Pros: Automatic upper-arm measurement, clear digital results, 60-reading memory, three-reading average, date and time storage, irregular heartbeat and movement indicators, and battery or dedicated adapter operation.
• Cons: The standard cuff fits 22–32 cm arms, repeated measurements require a rest interval, and the monitor must be protected from water, excessive electromagnetic interference, and improper cuff placement.