CH-657 - Blood pressure monitor CITIZEN - Free user manual and instructions

Product Type	Digital Blood Pressure Monitor
Brand	Citizen
Model	CH-657
Measurement Method	Oscillometric
Display	Digital display
Wrist Circumference Range	13.5 to 21.5 cm
Pressure Measurement Range	0 to 280 mmHg
Pulse Measurement Range	40 to 180 pulse/min
Accuracy (Pressure)	±3 mmHg
Accuracy (Pulse)	±5% of reading
Inflation	Automatic by internal pump
Exhaust	Electromagnetic quick exhaust valve
Power Supply	2 AAA batteries (LR03)
Battery Life	Approx. 400 measurements (at 180 mmHg, once/day, 22°C)
Memory Capacity	Up to 90 measurements
Operating Temperature	10°C to 40°C
Operating Humidity	30% to 85% RH
Storage Temperature	-20°C to 60°C
Storage Humidity	10% to 95% RH
Dimensions (W x H x D)	69 x 70 x 15 mm
Weight (without batteries)	Approx. 86 g
Safety Classification	Type B Equipment
Mode of Operation	Continuous
Accessories Included	2 AAA batteries, Instruction Manual, Storage case
Cleaning	Wipe monitor with cloth moistened with sterilizing alcohol or neutral detergent; avoid thinners or benzene. Clean cuff with moist cloth; avoid hard rubbing.
Calibration	Recommended every 2 years

Frequently Asked Questions - CH-657 CITIZEN

Why is blood pressure measured at home different from that measured at a doctor's office?

Your blood pressure can vary due to exercise, ambient temperature, or mental state. At a doctor's office, anxiety or stress can raise your blood pressure by 10 to 20 mmHg compared to home measurements. Home measurements are often more reliable as you are in a relaxed environment.

Why does blood pressure vary with each measurement?

Blood pressure is adjusted by automatic nerve function and differs with every heartbeat. It is influenced by the time of day, season, room temperature, mental stress, and emotional state. Even repeating measurements in quick succession can show variations.

What is the benefit of measuring my blood pressure at home?

Home measurements provide reliable data taken when you are stable and relaxed. Physicians value these readings for assessing your true blood pressure. It is recommended to measure at the same time each day and keep a record of variations.

How should I wrap the wrist cuff correctly?

Wrap the cuff around your bare left wrist so that the monitor is on the inside of your wrist. The top edge of the cuff should be about 1–2 cm from the crease of your wrist. Secure it with Velcro so it is snug but not too tight or too loose.

What do the error symbols mean on the display?

If the cuff is too loose, the 'cuff loose' icon appears. If you moved during measurement, the body movement indicator shows. If batteries are low, the battery icon appears. A pulse outside 40–180 beats/min triggers a pulse error. For other malfunctions, contact service.

How should I maintain and store the blood pressure monitor?

Store the monitor away from direct sunlight, extreme temperatures (below -20°C or above 60°C), high humidity (above 95%), and dust. Clean with a cloth moistened with sterilizing alcohol or neutral detergent. Never use thinners or benzene. Remove batteries if not used for a long period.

What does the Irregular Heartbeat (IHB) Indicator mean?

The IHB indicator appears if an irregular heartbeat is detected during measurement. If it appears frequently, consult your doctor. It may affect measurement accuracy, so re-measure if the indicator shows.

How do I delete stored measurement data?

Press the MEMORY switch, then while pressing it, press and hold the START/STOP switch for more than 3 seconds. All stored data will be deleted, and 'ALL CL' will appear on the display.

What should I do if the display stays blank when I press START/STOP?

Check if the batteries are dead or installed incorrectly (⊕ and ⊖ orientation). Replace all batteries with new ones if needed. If the problem persists, contact service.

How often should the monitor be calibrated?

It is generally recommended to have the monitor inspected every two years to ensure correct functioning and accuracy. Contact a distributor for calibration.

USER MANUAL CH-657 CITIZEN

INSTRUCTION MANUAL FOR

DIGITAL BLOOD PRESSURE MONITOR

REF CH-657

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0901

Contents

3 - GENERAL REMARKS
5 - PRECAUTIONS FOR USE AND MAINTENANCE
10 - IDENTIFICATION OF PARTS
12 - LOADING THE BATTERIES
13 - REMOVING THE BATTERIES
14 - HOW TO WRAP THE WRIST CUFF
16 - TIPS FOR OBTAINING ACCURATE MEASUREMENTS
18 - MEASURING YOUR BLOOD PRESSURE
20 - CALLING UP THE DATA STORED IN MEMORY
22 - ERROR INDICATIONS
23 - ABOUT "BLOOD PRESSURE"
24 - BLOOD PRESSURE Q&A
25 - BEFORE REQUESTING REPAIRS OR TESTING
26 - SPECIFICATIONS

Ensure that you have all the following components

Blood pressure monitor unit

Storage case (for monitor)

Simple line drawing of two cylindrical objects with rounded ends, resembling a rolled-up document or tool (no text or symbols)

2 AAA batteries

Instruction Manual

General remarks on blood pressure and blood pressure measurement

1. To deflate the cuff quickly, press the "START/STOP" switch.
2. The attached cuff is suitable for wrist circumferences of 13.5-21.5 cm.
3. When attaching the cuff, the body of a blood pressure monitor should be placed on the inside of your wrist.
4. Self measurement is not therapy! In no event should you change the dosage of your medication prescribed by your physician.
5. As preparation for measuring your blood pressure, you should urinate and then remain relatively still for 10 to 15 minutes prior to measurement.
6. Exercising, eating, drinking, smoking, etc., prior to measurement may affect the results.
7. Your blood pressure varies constantly throughout the day. Measurements should be taken regularly at the same time each day.
8. DO NOT place too much emphasis on the results of one measurement. Keep a continuing record of your blood pressure variations. A complete picture can only be obtained from a large number of readings.
9. Emotional stress tends to cause your blood pressure to rise.

To obtain correct blood pressure measurements

1. Take five or six deep breaths and then relax before measuring your blood pressure. If you are tense when taking the measurement, you will not get a valid reading.
2. Your blood pressure will be elevated if you are anxious or irritated, suffering from lack of sleep or constipation, or have just taken some exercise or eaten a meal.
3. Wrap the cuff around your wrist snugly. ( See page 14)
4. DO NOT measure your blood pressure after bathing or drinking.
5. If you feel the need to urinate, do so before measuring your blood pressure.
6. Measure your blood pressure where the room temperature is around 20^ C. DO NOT measure your blood pressure when it is too

cold (below 10^ C) or too hot (above 40^ C) in the room.

1. DO NOT try to measure your blood pressure immediately after drinking coffee or tea or after smoking.
2. Measure your blood pressure when you are relaxed and still. Keep the center of the cuff at the level of your heart and DO NOT move your arm or talk.
3. DO NOT measure blood pressure when the cuff has been on your wrist for a few minutes or more. During this time, your wrist will have built up a higher blood pressure and you will not get valid reading.
4. The figure below shows the blood pressure classifications under the WHO standards.

Remarks:

The graph is not exact, but may be used as a guide in understanding non-invasive blood pressure measurements. The device is only intended for use by adults.

Definitions and Classifications of Blood Pressure Levels

Measure your blood pressure at the same time each day.

* Your blood pressure changes all the time. This means that data gathered over a long period has far more signifi cance than data from just one measurement. For this reason, you must measure your blood pressure on a daily basis. Ideally, you should measure your blood pressure at the same time each day, wherever possible.

Precautions for use

1. If you suffer from heart disease, high blood pressure or other circulatory disease, consult your physician before using the monitor.
2. If you feel abnormal pressure of the cuff during use or any other irregularity, reduce the pressure by immediately switching off the power or remove the batteries and consult the sales outlet where purchased.
3. If you think the measurement is abnormal or if measurement makes you feel unwell, discontinue use and consult your physician.
4. Blood pressure measurement may not be possible for anyone with a weak pulse or arrhythmia.
5. Repeated blood pressure measurement may cause problems such as congestion or swelling in some people.
6. Frequently repeated blood pressure measurements will not give accurate results. Allow an interval of about 1 minute between measurements.
7. If you suffer from a severe problem with blood circulation in your arms, consult your physician before using the monitor. Failure to do so could be hazardous to your health.
8. Measurement may not be possible for anyone with insufficient blood flow to the area where measurements will be taken or who suffers from a frequent irregular heartbeat. Consult your physician for advice on whether to use the monitor.
9. DO NOT wrap the cuff around an injured wrist.
10. DO NOT wrap the cuff around a wrist in which a drip (intravenous infusion) is inserted, or which is being used for blood transfusion as part of medical treatment. Doing so could result in an injury or a serious accident.
11. DO NOT use the monitor in the vicinity of fl ammable gases such as those used for anaesthesia. Doing so could ignite the gases and cause an explosion.
12. DO NOT use the monitor in enriched oxygen environments such as a hospital's hyperbaric chamber or oxygen tent. Doing so could ignite the oxygen and cause a fire.

PRECAUTIONS FOR USE AND MAINTENANCE

1. DO NOT use mobile phones near the monitor as this could result in a malfunction.
2. If you use a cardiac pacemaker, consult your physician before using the monitor.
3. Be sure to use this unit only for measuring blood pressure. DO NOT use it for any other purpose.
4. DO NOT use this unit on infants.
5. Blood pressure measurement may not be possible for anyone with common arrhythmias such as atrial or ventricular premature beats or atrial fi brillation.

Maintenance Precautions

1. DO NOT store the blood pressure monitor in locations exposed to direct sunlight, high temperatures (over 60^ C), low temperatures (below -20^ C), high relative humidity (over 95%) or excessive amounts of dust.
2. DO NOT drop the blood pressure monitor or subject it to other shocks or vibration.
3. Remove the batteries if the monitor will be left unused for a long period.
4. DO NOT attempt to disassemble the monitor.
5. DO NOT bend the cuff excessively.
6. If the monitor is very dirty, wipe it clean with a cloth moistened with sterilizing alcohol or a neutral detergent. Then wipe it with a dry cloth.
7. NEVER clean the blood pressure monitor with thinners or benzene, as this could damage the monitor.
8. To clean the cuff, wipe it with a moist cloth. Avoid hard rubbing, as this will cause air leakages.

Symbols Explanation

: The CE marking is meant to provide information to market inspectors in the EU member countries.
: Type B applied part
: Refer to instruction manual before use
: Appliance compliance WEEE directive
: Accumulators and battery packs for separate collection
: Manufacturer

Warning

The device has been tested and homologated in accordance with EN60601-1-2 for EMC. This does not guarantee in any way that the device will not be affected by electromagnetic interference. Avoid using the device in high electromagnetic environment.

Nature and frequency of maintenance:

This product is designed for use over an extended period of time; however, it is generally recommended that it be inspected every two years to ensure proper function and performance.

Protect the nature environment:

Please help to protect natural environment by respecting national and/or local recycling regulations when disposing of the battery and the product at the end of their useful live.

WEEE MARK

If you want to dispose this product, do not mix with general household waste. There is a separate collection systems for used electronics products in accordance with legislation under the WEEE Directive (Directive 2002/96/EC) and is effective only within European Union.

Symbol of a trash bin with crossed lines and a solid black rectangle below (no text or labels)

Information for Users on Collection and Disposal of used Batteries.

The symbol in this information sheet means that used batteries should not be mixed with general household waste.

For proper treatment, recovery and recycling of used batteries, please take them to applicable collection points.

For more information about collection and recycling of batteries, please

contact your local municipality, your waste disposal service or the point of sale where you purchased the items.

Information on Disposal in other Countries outside the European Union.

This symbol is only valid in the European Union.

If you wish to discard used batteries, please contact your local authorities or dealer and ask for the correct method of disposal.

Note for the battery symbol.

The symbol might be used in combination with a chemical symbol. In this case it complies with the requirement set by the Directive for the chemical involved.

Calibration:

The blood pressure measuring device is generally recommended to have the monitor inspected every two years to ensure correct functioning and accuracy. Please contact a distributor.

European Representative:

- For technical data, please contact our European Representative

0086

IDENTIFICATION OF PARTS

Component names

LOADING THE BATTERIES

(Batteries supplied with the unit should be loaded in compartment before you use the blood pressure monitor.)

1 Open the cover of battery compartment.

Pressing down on the battery cover, slide the cover off in the direction of the arrow.

2 Place batteries in the compartment.

Put the batteries paying attention to the positive and negative terminal symbols ⊕ and ⊖

* The battery goes in negative side first.

Insert the battery near the display first.

3 Close the battery cover.

Slide the cover in the direction of the arrow. Push the cover on until it clicks.

REMOVING THE BATTERIES

• When the icon is displayed or nothing appears in the display, replace the old batteries with two new ones. All two batteries should be changed at once.
• Do not use rechargeable batteries.
• Do not use alkaline (LR03) and manganese (R03) batteries together.
• Batteries included are for demonstration purposes only. Battery life may be shorter than specified.
• When disposing of used batteries, comply with governmental regulations or environmental public institution's rules that apply in your country/area.

HOW TO WRAP THE WRIST CUFF

Wrap the wrist cuff around your wrist properly. Improper wrapping of the cuff may result in measuring errors.

1 Unfasten and open the wrist cuff. 2 Wrap the cuff around your left wrist so that the monitor is positioned on the inside of your wrist.

• Wrap the wrist cuff on bare skin.
• The wrist cuff is designed to fit wrists from 13.5 to 21.5 cm in circumference.

3 Loosely fit the wrist cuff by pulling the end of the cuff.

4 Position the top edge of the cuff approximately 1 to 2 ~cm away from the crease of your wrist.

5 Secure the wrist cuff with the Velcro.

- If the wrist cuff is wrapped too loose or tight, errors or incorrect readings may result.

You may use your right wrist to measure your blood pressure.

However, your blood pressure may differ by about 10mmHg depending on whether measured on your left or your right wrist, so ideally you should measure your blood pressure on the same wrist each time.

To obtain accurate measurements

• Wrapping the cuff too loosely or too tightly may prevent correct measurement.
• Sit up straight while taking the measurement.

TIPS FOR OBTAINING ACCURATE MEASUREMENTS

Your blood pressure varies according to your posture, the time of day and a range of other factors. Ideally, you should measure your blood pressure in the same posture at the same time every day.

① Make sure that your posture is correct. Sit up straight, take a deep breath and relax.

To obtain correct measurements

- Do not clench your fi st tightly.

- Do not wrap the wrist cuff too loosely.

- Do not change the position of the monitor.

- Do not move your body or talk during measurement

MEASURING YOUR BLOOD PRESSURE

1 Wrap the wrist cuff around your left wrist.

( See page 14 "HOW TO WRAP THE WRIST CUFF".)

2 Make sure that your posture is correct.

( See page 16 "TIPS FOR OBTAINING ACCURATE MEASUREMENTS".)

3 Press the "START/STOP" switch to start measurement.

is displayed when a pulse is detected.

4 The measurement results are displayed.

Silhouette of a person gesturing with hand (no text or symbols)

The Body Movement Indicator is displayed on the measurement results display if you move your hand or wrist during measurement, causing a substantial pressure change to be detected.

- If the Body Movement Indicator is displayed, measure your blood pressure again.

Black heart-shaped icon with exclamation mark and sound waves (no text or symbols)

If an irregular heartbeat is detected during measurement, the Irregular Heartbeat (IHB) Indicator is displayed after measurement is completed.

- Measurement may not be correct if your heartbeat fluctuates greatly during measurement. If the Irregular Heartbeat (IHB) Indicator is displayed, measure your blood pressure again.

Caution

If the Irregular Heartbeat (IHB) Indicator appears frequently, you are advised to consult a doctor about your health condition.

5 Finishing measurement.

- Press the "START/STOP" switch to turn the monitor off.

AUTOMATIC POWER OFF FEATURE

- After taking the blood pressure measurement, pressing the “START/STOP” switch will turn the monitor off. However, if you do not press the switch, the monitor’s Auto OFF function will automatically turn the monitor off after 3 minutes.

CALLING UP THE DATA STORED IN MEMORY

90 measurement results can be stored in the memory.

The average value is calculated automatically to help you manage your daily health.

HOW TO CALL UP THE DATA

1 Press the "MEMORY" switch.

- “3A” indicating the average value appears on the left section of the display. Then, the average value, based on the last three measurements, is displayed. (“3A” and the average value do not appear if there are two or fewer measurements stored in memory.)

2 Each time you press the switch, the measurement data are displayed in order from the most recent to the oldest.

- The value stored in memory is numbered in the order of measurements. For example, when 90 sets of data are stored in memory, the data number 1 represents the latest data.

Data number: 1, 2, 3, ... ... 89, 90

The latest data The earliest data

HOW TO DELETE THE DATA

1 Press the "MEMORY" switch.
2 While pressing the "MEMORY" switch, press and hold the "START/STOP" switch for more than 3 seconds.

All the stored data will be deleted.

Press and hold for 3 seconds

Deleted

A message saying all the data have been deleted from the memory is displayed.

ERROR INDICATIONS

DISPLAY MARK CONDITION/CAUSE		CORRECTIVE ACTION
	Appears when the wrist cuff is wrapped too loose.	Re-wrap the wrist cuff snugly. Take another reading, making sure you remain still. (See page 14 “HOW TO WRAP THE WRIST CUFF”.)
	Appears when your wrist moved during the measurement.; or Appears when the cuff is not wrapped correctly.	Re-wrap the wrist cuff correctly. Take another reading, making sure you remain perfectly still. (See page 14 “HOW TO WRAP THE WRIST CUFF”.)
	Appears when the batteries have run out.	Replace two alkaline batteries with new ones. (See page 13 “REMOVING THE BATTERIES”.)
	Appears when the pulse rate falls outside the measuring range (below 39 beats/min. or above 181 beats/min.)	Re-wrap the wrist cuff properly. Take deep breaths to relax, and measure again. (See page 16 “TIPS FOR OBTAINING ACCURATE MEASUREMENT”.)
	The unit does not function properly.	Contact the store where it was purchased or your local service center. (See page 25 “BEFORE REQUESTING REPAIRS OR TESTING”.)

ABOUT "BLOOD PRESSURE"

What is blood pressure?

The heart is a pump that circulates blood throughout your body. Blood is pumped from the heart at a constant pressure into arteries. This pressure is called the arterial blood pressure and represents, in general terms, your blood pressure. Blood pressure is indicated by several kinds of pressures, including the systolic pressure that occurs when the heart pumps blood, and the diastolic pressure that occurs when blood returns to the heart.

Your blood pressure changes all the time.

Your blood pressure differs according to your age, gender and a range of other factors. It is likely to be affected by your biorhythm during the day and by your posture, physical activities, mental activities, level of stress and even by the air temperature. The blood pressure of a healthy person generally varies within a day.

[Example of blood pressure variations within a day]

(Blood pressure values measured at five-minute intervals through the day)
- Bevan AT, Honour AJ, Stott FH. Clin Sci 1969;36:329–44.

BLOOD PRESSURE Q&A

Q Why is the blood pressure measured at home different from that measured by the physician or at a hospital?
A Your blood pressure may vary due to exercise, the ambient temperature or your mental state. When you have a physician or nurse measure your blood pressure, the pressure value is likely to be 10 to 20 mmHg higher than usual due to anxiety and/or stress. Knowing what affects your blood pressure helps you to better monitor your health.
Q Why does the blood pressure obtained vary with measurement?
A Our blood pressure is adjusted by automatic nerve function. Blood pressure differs with every heart beat. We are likely to think that our blood pressure is constant, but it varies if you take measurements in repetition. Blood pressure is susceptible to the time of day, such as morning and afternoon, season and atmospheric temperature. In addition, blood pressure is easily affected by mental stress or emotional ups and downs. It tends to increase when you feel tension or decrease when you are relaxed.
Q What is the benefit of measuring my blood pressure at home?
A Blood pressure measurements taken at home give reliable data as they can be taken when you are in a stable and relaxed condition. Physicians place considerable importance on blood pressure measurements taken at home. You should measure your blood pressure at the same time each day and record the variations in your blood pressure.

Illustration of a person with arms and legs, pointing to an unknown question mark (no text or symbols present)

Always consult your physician for an interpretation of your blood pressure readings and to determine the proper treatment.

BEFORE REQUESTING REPAIRS OR TESTING

Make sure to check the following before sending your blood pressure monitor away to be tested or repaired.

Problem Checks Response
Display stays blank when you press the “START/STOP” switch.	Check whether the batteries are dead.	Replace all the batteries with new ones.
	Check whether the batteries are installed the right way round (⊕ and ⊖ oriented correctly).	Load the batteries in the correct direction.
No measurements can be taken.	Check whether the measurement icon ♥ is displayed.	Attach the cuff properly.
	Check whether the cuff is attached correctly.
	Did you stay calm during measurement?	Measure your blood pressure again, making sure to remain still.
	Note that blood pressure measurement may not be possible for someone with an extremely weak pulse or cardiac arrhythmia (irregular pulse).
Your blood pressure readings are abnormally high or low compared with those taken in hospital.		See page 24.
Other phenomena		Remove the batteries from the unit and change them with new ones.

SPECIFICATIONS

Model Number CH-657
Measurement system Oscillometric method
Display Digital display type
Wrist circumference range 13.5 to 21.5 cm
Measurement range	Pressure 0 to 280 mmHg
	Pulse 40 to 180 pulse/min
Accuracy	Pressure ±3 mmHg
	Pulse ±5% of reading
Inflation		Automatic inflation by internal pump
Rated voltage 3V DC		--- (---direct current)
Exhaust Electromagnetic quick exhaust valve
Power supply 2 AAA batteries (LR03)
Battery duration Approx. 400 times			(180 mmHg, once/day, 22°C)
Operating conditions	Temperature	10°C to 40°C
	Humidity 30%	to 85% RH
Storage conditions	Temperature	-20°C to 60°C
	Humidity 10%	to 95%RH
Memory Function		Up to 90 measurements
Electric shock Protection		Internal power unit
Safety Classifi cation		Type B Equipment
Mode of operation		Continuous operation
Protection against ingress of water		IPX0
Dimensions		69(W) x 70(H) x 15(D) mm
Weight		Approx. 86g w/o batteries
Accessories		Set includes 2 AAA batteries (LR03) for the monitor, Instruction Manual, Storage case

• CITIZEN is a registered trade mark of Citizen Holdings Co., Japan. CITIZEN es una marca registrada de Citizen Holdings Co., Japón.
“CITIZEN”和“西铁城”是日本法人西铁城控股株式会社的注册商标
- Design and Specification are subject to change without notice.