Contec CMS50D User Manual

Instructions to User

Dear Users, thank you very much for purchasing our product.
This Manual is written and compiled in accordance with the council directive MDD93/42/EEC for medical devices and
harmonized standards. The Manual is written for the current Pulse Oximeter. In case of modifications and software upgrades, the
information contained in this document is subject to change without notice.
The Manual describes, in accordance with the Pulse Oximeter's features and requirements, main structure, functions,
specifications, correct methods for transportation, installation, usage, operation, repair, maintenance and storage, etc. as well as
the safety procedures to protect both the user and equipment. Refer to the respective chapters for details.
Please read the Manual very carefully before using this equipment. These instructions describe the operating procedures to be
followed strictly, failure to follow these instructions can cause measuring abnormality, equipment damage and personal injury.
The manufacturer is NOT responsible for the safety, reliability and performance issues and any monitoring abnormality, personal
injury and equipment damage due to user's negligence of the operation instructions. The manufacturer’s warranty service does not
cover such faults.
Owing to the forthcoming renovation, the specific products you received may not be totally in accordance with the description of
this User Manual. We would sincerely regret for that.
This product is medical device, and can be used repeatedly. Its using life is 3 years.

WARNING:
 The uncomfortable or painful feeling may appear if using the device ceaselessly, especially for the microcirculation

barrier patients. It is recommended that the sensor should not be applied to the same finger for over 2 hours.

 For the individual patients, there should be a more prudent inspecting in the placing process. The device can not be

clipped on the edema and tender tissue.

 The light (the infrared is invisible) emitted from the device is harmful to the eyes, so the user and the maintenance

man, can not stare at the light.

 Testee can not use enamel or other makeup.
 Testee’s fingernail can not be too long.
 Please peruse the relative content about the clinical restrictions and caution.
 This device is not intended for treatment.

Caution: Federal law restricts this device to sale by or on the order of a physician.

1 Safety

1.1 Instructions for Safe Operations



Check the main unit and all accessories periodically to make sure that there is no visible damage that may affect p atient's
safety and monitoring performance about cables and transducers. It is recommended that the device should be inspected
once a week at least. When there is obvious damage, stop using the monitor.



Necessary maintenance must be performed by qualified service engineers ONLY. Users are not permitted to maintain it by
themselves.



The oximeter cannot be used together with devices not specified in User's Manual.Only the accessory that appointed or
recommendatory by manufacture can be used with this device.



This product is calibrated before leaving factory.

1.2 Warnings

 Explosive hazard—DO NOT use the oximeter in environment with inflammable gas such as some ignitable anesthetic

agents.

 DO NOT use the oximeter while the testee measured by MRI and CT.
 The person who is allergic to rubber can not use this device.
 The disposal of scrap instrument and its accessories and packings(including battery, plastic bags, foams and paper boxes)

should follow the local laws and regulations.

 Please check the packing before use to make sure the device and accessories are totally in accordance with the packing list,

or else the device may have the possibility of working abnormally.

 Please don't measure this device with function test paper for the device's related information.

1.3 Attentions

 Keep the oximeter away from dust, vibration, corrosive substances, explosive materials, high temperature and moisture.
 If the oximeter gets wet, please stop operating it.
 When it is carried from cold environment to warm or humid environment, please do not use it immediately.
 DO NOT operate keys on front panel with sharp materials.
 High temperature or high pressure steam disinfection of the oximeter is not permitted. Refer to User Manual in the relative

chapter for instructions of cleaning and disinfection.

 Do not have the oximeter immerged in liquid. When it needs cleaning, please wipe its surface with medical alcohol by soft

material. Do not spray any liquid on the device directly.

 When cleaning the device with water, the temperature should be lower than 60℃.
 As to the fingers which are too thin or too cold, it would probably affect the normal measure of the patients' SpO2 and pulse

rate, please clip the thick finger such as thumb and middle finger deeply enough into the probe.

 Do not use the device on infant or neonatal patients.
 The product is suitable for children above four years old and adults (Weight should be between 15kg to 110kg).
 The device may not work for all patients. If you are unable to achieve stable readings, discontinue use.
 The update period of data is less than 5 seconds, which is changeable according to different individual pulse rate.
 The waveform is normalized.Please read the measured value when the waveform on screen is equably and steady-going,

Here this measured value is optimal value. And the waveform at the moment is the standard one.

 If some abnormal conditions appear on the screen during test process, pull out the finger and reinsert to restore normal use.
 The device has normal useful life for three years since the first electrified use.
 The hanging rope attached the product is made from Non- allergy material, if particular group are sensitive to the hanging

rope, stop using it. In addition, pay attention to the use of the hanging rope , do not wear it around the neck avoiding cause
harm to the patient.

 The instrument dose not have low-voltage alarm function, it only shows the low-voltage.please change the battery when

the battery energy is used out.

 When the parameter is particularly, The instrument dose not have alarm function.Do not use the device in situations where

alarms are required.

 Batteries must be removed if the device is going to be stored for more than one month, or else batteries may leak.
 A flexible circuit connects the two parts of the device. Do not twist or pull on the connection.

1.4 Indication for Use

The Fingertip Pulse Oximeter is a non-invasive device intended for the spot-check of oxygen saturation of arterial hemoglobin
(SpO2) and the pulse rate of adult and pediatric patients in home and hospital environments (including clinical use in
internist/surgery, anesthesia, intensive care ect.). This device is not intended for continuous monitoring.

2 Overview

The pulse oxygen saturation is the percentage of HbO2 in the total Hb in the blood, so-called the O2 concentration in the blood. It
is an important bio-parameter for the respiration. For the purpose of measuring the SpO2 more easily and accurately, our company
developed the Pulse Oximeter. At the same time, the device can measure the pulse rate simultaneously.
The Pulse Oximeter features in small volume, low power consumption, convenient operation and being portable. It is only
necessary for patient to put one of his fingers into a fingertip photoelectric sensor for diagnosis, and a display screen will directly
show measured value of Hemoglobin Saturation.

2.1 Classification

Class II b, (MDD93/42/EEC IX Rule 10)

2.2 Features

 Operation of the product is simple and convenient.
 The product is small in volume, light in weight (total weight is about 50g including batteries) and convenient in carrying.
 Power consumption of the product is low and the two originally equipped AAA batteries can be operated continuously for

20 hours.

 The product will automatically be powered off when no signal is in the product within 5 seconds.
 4 directions display mode without waveform.
 Waveform display mode as line drawing or filling manner.

2.3 Major Applications and Scope of Application

The Pulse Oximeter can be used to measure human Hemoglobin Saturation and pulse rate through finger, and indicate the pulse
intensity by the bar-display. The product is suitable for use in family, hospital (Ordinary sickroom), Oxygen Bar, social medical
organizations and also the measure of saturation oxygen and pulse rate.

The product is not suitable for use in continuous supervision for patients.
The problem of overrating would emerge when the patient is suffering from toxicosis which caused by carbon

monoxide, the device is not recommended to be used under this circumstance.

2.4 Environment Requirements

Storage Environment
a) Temperature: -40℃~+60℃
b) Relative humidity: ≤95%
c) Atmospheric pressure: 500hPa~1060hPa
Operating Environment
a) Temperature: 10℃~40℃
b) Relative Humidity: ≤75%
c) Atmospheric pressure: 700hPa~1060hPa

3 Principle and Caution

3.1 Principle of Measurement

Principle of the Oximeter is as follows: An experience formula of data process is established taking use of Lambert Beer Law
according to Spectrum Absorption Characteristics of Reductive Hemoglobin (Hb) and Oxyhemoglobin (HbO2) in glow &
near-infrared zones. Operation principle of the instrument is: Photoelectric Oxyhemoglobin Inspection Technology is adopted in
accordance with Capacity Pulse Scanning & Recording Technology, so that two beams of different wavelength of lights can be
focused onto human nail tip through perspective clamp finger-type sensor. Then measured signal can be obtained by a
photosensitive element, information acquired through which will be shown on screen through treatment in electronic circuits and
microprocessor.

Figure 1 Operating principle

3.2 Caution

1. The finger should be placed properly (see the attached illustration of this manual, Figure 5), or else it may cause inaccurate

measurement.

2. The SpO2 sensor and photoelectric receiving tube should be arranged in a way with the subject’s arteriole in a position there

between．

3. The SpO2 sensor should not be used at a location or limb tied with arterial canal or blood pressure cuff or receiving

intravenous injection.

4. Make sure the optical path is free from any optical obstacles like rubberized fabric.

5. Excessive ambient light may affect the measuring result. It includes fluorescent lamp, dual ruby light, infrared heater, direct

sunlight and etc.

6. Strenuous action of the subject or extreme electrosurgical interference may also affect the accuracy.

7. Testee can not use enamel or other makeup.

3.3 Clinical Restrictions

1. As the measure is taken on the basis of arteriole pulse, substantial pulsating blood flow of subject is required. For a subject

with weak pulse due to shock, low ambient/body temperature, major bleeding, or use of vascular contracting drug, the SpO2
waveform (PLETH) will decrease. In this case, the measurement will be more sensitive to interference.

2. For those with a substantial amount of staining dilution drug (such as methylene blue, indigo green and acid indigo blue), or

carbon monoxide hemoglobin (COHb), or methionine (Me+Hb) or thiosalicylic hemoglobin, and some with icterus problem,
the SpO2 determination by this monitor may be inaccurate.

3. The drugs like dopamine, procaine, prilocaine, lidocaine and butacaine may also be a major factor blamed for serious error of

SpO2 measure.

4. As the SpO2 value serves as a reference value for judgement of anemic anoxia and toxic anoxia, some patients with serious

anemia may also report good SpO2 measurement.

4 Technical Specifications

1) Display Format: OLED Display;
SpO2 Measuring Range: 0% ~ 100%;
Pulse Rate Measuring Range: 30 bpm ~ 250 bpm;
Pulse Wave Display: columniation display and the waveform display.

2) Power Requirements: 2×1.5V AAA alkaline battery (or using the rechargeable battery instead), adaptable range:

2.6V~3.6V.

3) Power Consumption: Smaller than 30mA.

4) Resolution: 1% for SpO2 and 1 bpm for Pulse Rate.

5) Measurement Accuracy: ±2% in stage of 70%-100% SpO2, and meaningless when stage being smaller than 70%. ±2 bpm

during the pulse rate range of 30-99 bpm and ±2% during the pulse rate range of 100~250 bpm .

6) Measurement Performance in Weak Filling Condition: SpO2 and pulse rate can be shown correctly when pulse-filling

ratio is 0.4%. SpO2 error is ±4%, pulse rate error is ± 2 bpm during the pulse rate range of 30~99 bpm and ±2% during the
pulse rate range of 100~250 bpm .

7) Resistance to surrounding light: The deviation between the value measured in the condition of man-made light or indoor

natural light and that of darkroom is less than ±1%.

8) It is equipped with a function switch. The Oximeter can be powered off in case no finger is the Oximeter within 5 seconds.

9) Optical Sensor
Red light (wavelength is 660nm, 6.65mW)
Infrared (wavelength is 880nm, 6.75mW)

5 Accessories

 One hanging rope;
 Two batteries(optional)
 One User Manual.

6 Installation

6.1 View of the Front Panel

Figure 2 Front view Figure 3 Batteries installation Figure 4 Mounting the hanging rope

6.2 Battery

Step 1. Refer to Figure 3. and insert the two AAA size batteries properly in the right direction.
Step 2. Replace the cover.

Please take care when you insert the batteries for the improper insertion may damage the device.

6.3 Mounting the Hanging Rope

Step 1. Put the end of the rope through the hole.
Step 2. Put another end of the rope through the first one and then tighten it.

7 Operating Guide

1) Insert the two batteries properly to the direction, and then replace the cover.

2) Open the clip as shown in Figure 5.

Figure 5 Put finger in position

3) Let the patient’s finger put into the rubber cushions of the clip (make sure the finger is in the right position), and then clip

the finger.

4) Press the switch button once on front panel.

5) Do not shake the finger and keep the patient at ease during the process. Meanwhile, human body is not recommended in

movement status.

6) Get the information directly from screen display.

7) The button has three functions.When the device is power off, pressing the button can open it; When the device is

power on, pressing the button shortly can change direction of the screen; When the device is power on, pressing the button

long can change brightness of the screen.

Press the button shortly when the device is power on, the display mode will change, show as follow figure:

Figure 6 Display mode one Figure 7 Display mode two Figure 8 Display mode three

Figure 9 Display mode four Figure 10 Display mode five Figure 11 Display mode six

Fingernails and the luminescent tube should be on the same side.

8 Repairing and Maintenance

 Please change the batteries when the low-voltage displayed on the screen.
 Please clean the surface of the device before using. Wipe the device with medical alcohol first, and then let it dry in air or

clean it by dry clean fabric.

 Using the medical alcohol to disinfect the product after use, prevent from cross infection for next time use.
 Please take out the batteries if the oximeter is not in use for a long time.
 The best storage environment of the device is - 40ºC to 60ºC ambient temperature and not higher than 95% relative

humidity.

 Users are advised to calibrate the device termly (or according to the calibrating program of hospital). It also can be

performed at the state-appointed agent or just contact us for calibration.

High-pressure sterilization cannot be used on the device.
Do not immerse the device in liquid.
It is recommended that the device should be kept in a dry environment. Humidity may reduce the useful life of
the device, or even damage it.

9 Troubleshooting

Trouble

Possible Reason

Solution

The SpO2 and Pulse
Rate can not be
displayed normally

1. The finger is not properly positioned.

2. The patient’s SpO2 is too low to be detected.

1. Place the finger properly and try again.

2. Try again; Go to a hospital for a
diagnosis if you are sure the device works
all right.

The SpO2 and Pulse
Rate are not displayed
stably

1. The finger is not placed inside deep enough.

2. The finger is shaking or the patient is
moving.

1. Place the finger properly and try again.

2. Let the patient keep calm

The device can not be
turned on

1. The batteries are drained or almost drained.

2. The batteries are not inserted properly.

3. The malfunction of the device.

1. Change batteries.

2. Reinstall batteries.

3. Please contact the local service center.

The display is off
suddenly

1. The device will power off automatically
when it gets no signal within 5 seconds.

2. The batteries are almost drained.

1. Normal.

2. Change batteries.

10 Key of Symbols

Symbol

Description

Type BF Warning – See User Manual

The pulse oxygen saturation(%)

PRbpm

Pulse rate (bpm)

The battery voltage indication is deficient (change the battery in time avoiding the inexact measure)

1. no finger inserted

2. An indicator of signal inadequacy

battery positive electrode

battery cathode

1.Power switch

2.change direction of the screen

3.Change brightness of the screen

SN

Serial number

Alarm inhibit

WEEE (2002/96/EC)

IP22

International Protection

This item is compliant with Medical Device Directive 93/42/EEC of June 14, 1993, a directive of the
European Economic Community.

11 Function Specification

Display Information

Display Mode

The Pulse Oxygen Saturation (SpO2)

OLED

Pulse Rate (PR)

OLED

Pulse Intensity (bar-graph)

OLED bar-graph display

Pulse wave

OLED

SpO2 Parameter Specification

Measuring range

0%~100%, (the resolution is 1%).

Accuracy

70%~100%:±2%, Below 70% unspecified.

Optical Sensor

Red light (wavelength is 660nm)
Infrared (wavelength is 880nm)

Pulse Parameter Specification

Measuring range

30bpm~250bpm (the resolution is 1 bpm)

Accuracy

±2bpm or±2% select larger

Pulse Intensity

Range

Continuous bar-graph display, the higher display indicate the stronger
pulse.

Battery Requirement

1.5V (AAA size) alkaline batteries × 2 or rechargeable battery

Battery Useful Life

Two batteries can work continually for 20 hours

Dimensions and Weight

Dimensions

57(L) × 31(W) × 32(H) mm

Weight

About 50g (with the batteries)

Appendix

Guidance and manufacture’s declaration-electromagnetic emission

for all EQUIPMENT and SYSTEMS

Guidance and manufacture’s declaration –electromagnetic emission

The CMS50D Pulse Oximeter is tended for use in the electromagnetic environment specified below. The customer of the user
of the CMS50D Pulse Oximeter should assure that it isused in such an environment.

Emission test

compliance

Electromagnetic environment-guidance

RF emissions
CISPR 11

Group 1

The CMS50D Pulse Oximeter uses RF energy only for their
internal function. Therefore, its RF emissions are very low and are
not likely to cause any interference in nearby electronic
equipment.

RF emissions
CISPR 11

Class B

The CMS50D Pulse Oximeter is suitable for use in all
establishments, including domestic establishments and those
directly connected to the public low-voltage power supply

Harmonic emissions

Not applicable

IEC 61000-3-2

network that supplies buildings used for domestic purposes.
Voltage fluctuations/
flicker emission
IEC 61000-3-3

Not applicable

Guidance and manufacture’s declaration-electromagnetic immunity

for all EQUIPMENT and SYSTEMS

Guidance and manufacture’s declaration-electromagnetic immunity

The CMS50D Pulse Oximeter is intended for use in the electromagnetic environment specified specified below. The the user of
CMS50D Pulse Oximeter should assure that it is used in such an environment.

Immunity test

IEC60601 test level

Compliance level

Electromagnetic
environment-guidance

Electrostatic discharge
(ESD) IEC 61000-4-2

±6KV contact
±8KV air

±6KV contact
±8KV air

Floors should be wood, concrete or
ceramic tile. If floor are covered with
synthetic material, the relative
humidity should be at least 30%.

Power frequency
(50Hz) magnetic field
IEC 61000-4-8

3A/m

3A/m

Power frequency magnetic fields
should be at levels characteristic of a
typical location in a typical
commercial or hospital environment

Guidance and manufacture’s declaration-electromagnetic immunity
for EQUIPMENT and SYSTEMS that are not LIFE-SUPPORTING

Guidance and manufacture’s declaration-electromagnetic immunity

The CMS50D Pulse Oximeter is intended for use in the electromagnetic environment specified below. The customer or the
user of CMS50D Pulse Oximeter should assure that it is used in such an environment.

Immunity
test

IEC60601 test
level

Compliance
level

Electromagnetic environment -guidance

Radiated RF
ICE
61000-4-3

3V/m
80MHz to

2.5GHz

3V/m

Portable and mobile RF communication equipment should be used no
closer to any part of the CMS50D Pulse Oximeter, including cables, than
the recommended separation distance calculated from the equation
applicable to the frequency of the transmitter.

recommended separation distance

P

E

d













1

5.3

80MHz to 800MHz

P

E

d













1

7

800MHz to 2.5GHz

Where P is the maximum output power rating of the transmitter in watts
(W) according to the transmitter manufacturer and d is the recommended
separation distance in meters (m).
Field strengths from fixed RF transmitters, as determined by an
electromagnetic site survey, a should be less than the compliance level in
each frequency range.

b

Interference may occur in the vicinity of equipment marked with the
following symbol:

NOTE 1 At 80MHz and 800MHz, the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects and people.

a

Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile
radios, amateur radio, AM and FM radio broadcast and TV broadcastcannot be predicted theoretically with accuracy. To
assess the electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should be considered. If
the measured field strength in the location in which The CMS50D Pulse Oximeter is used exceeds the applicable RF
compliance level above, the CMS50D Pulse Oximeter should be observed to verify normal operation. If abnormal
performance is observed, additional measures may be necessary, such as reorienting or relocating the CMS50 D Pulse
Oximeter.

b

Over the frequency range 150 KHz to 80 MHz, field strengths should be less than 3V/m.

Recommended separation distances between portable and mobile

RF communications equipment and the EQUIPMENT or SYSTEM

for EQUIPMENT or SYSTEM that not LIFE-SUPPORTING

Recommended separation distances between
portable and mobile RF communications equipment and the CMS50D Pulse Oximeter

The CMS50D Pulse Oximeter is intended for use in the electromagnetic environment in which radiated RF disturbances are
controlled. The customer or the user of the CMS50D Pulse Oximeter can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the CMS50D
Pulse Oximeter as recommended below, according to the maximum output power of the communications equipment.

Rated maximum output power
of transmitter
(W)

Separation distance according to frequency of transmitter
(m)

150KHz to 80MHz

P

E

d













1

5.3

80MHz to 800MHz

P

E

d













1

5.3

800MHz to 2.5GHz

P

E

d













1

7

0.01

0.12

0.12

0.23

0.1

0.37

0.37

0.74

1

1.17

1.17

2.33

10

3.69

3.69

7.38

100

11.67

11.67

23.33

For transmitters rated at a maximum output power not listed above, the recommended separation distanced in meters (m) can
be estimated using the equation applicable to the frequency of the transmitter, where P is the maximum output power rating of
the transmitter in watts (W) according to the transmitter manufacturer.
NOTE 1 At 80MHz and 800MHz, the separation distance for the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects and people.