Micro Direct MicroCO Manuel utilisateur

MicroCO Meter

Operating Manual

Federal (USA) law restricts this device to sale by or on

the order of a physician or licensed practitioner.

Micro Direct, Inc.

803 Webster Street

Lewiston, ME 04240

1-800-588-3381

www.mdspiro.com

073-04 US

Issue 1.6

February 2019

Table of Contents 
Overview......................................................1 
Introduction ..................................................1 
Smoke Inhalation/CO Poisoning...................2 
Cigarette Consumption.................................3 
Package Contents........................................5 
Contraindications..........................................7 
Warnings and Cautions................................7 
Intended Use................................................8 
Operation .....................................................9 
PC Connection...........................................12 
Calibration..................................................12 
Battery Life.................................................16 
Battery Replacement..................................16 
Internal Battery Expiry................................17 
Sensor Expiry.............................................17 
Product Lifetime .........................................18 
Cleaning.....................................................18 
Servicing ....................................................19 
Trouble Shooting Information.....................19 
Safety Designation per IEC 60601-1..........21 
Electromagnetic Compatibility (EMC) to.....22 
EN60601-1-2:2007.....................................22 
Symbols .....................................................26 
Consumables / Accessories.......................27 
Specifications.............................................28 
Customer Contact Information ...................29 
 
 
 
 
 

Overview

The MicroCO is a hand-held battery-operated device used to

measure the concentration of carbon monoxide, CO, on the

breath and calculates the percentage of carboxyhemoglobin,

%COHb, in the blood.

It is accurate, easy to use, and has many features designed

to simplify its operation.

These include: Auto zero function

Smoking level color light indicators

Poison level alarm

Simple calibration

Serial interface to PC

Please note: It is recommended that this unit be

calibrated upon receipt.

This device should only be used by trained and qualified

personnel.

Introduction

The MicroCO is based on an electrochemical fuel cell

sensor, which works through the reaction of carbon

monoxide (CO) with an electrolyte at one electrode, and

oxygen (from ambient air) at the other. This reaction

generates an electrical current proportional to CO

concentration. Output from the sensor is monitored by a

microprocessor, which detects peak expired concentrations

of alveolar gas. This is then converted to %

carboxyhemoglobin (%COHb) using the mathematical

relationships described by Jarvis et al1, for concentrations

below 90 ppm, and by Stewart et al2for higher levels.

Raised levels of carboxyhemoglobin are most commonly

caused by accidental smoke inhalation/CO poisoning or

cigarette smoking. The MicroCO includes a countdown

timer as an aid to timing the breath holding period prior to

exhalation.

The results are displayed on a clear LCD display. Warning

lights are provided to give an instant indication of the

smoking level.

The countdown timer, warning light levels, and the alarm

level are user adjustable when the unit is connected to a PC

running COBRA software.

Note: the countdown timer, warning light levels, and the

alarm level used throughout this manual are the factory

settings and may have been changed.

References

1. Jarvis MJ, Belcher M, Vesey C, Hutchison DCS

Low cost carbon monoxide monitors in smoking assessment

Thorax 1986; 41: 886-887

2. Stewart RD, Stewart RS, Stamm W, Seleen RP

Rapid estimation of carboxyhemoglobin levels in fire fighters

JAMA 1976; 235, 390-392

Smoke Inhalation/CO Poisoning

CO poisoning usually occurs as a result of smoke inhalation

from fires or exposure to CO from car exhausts or faulty

heating systems. CO binds with hemoglobin to form

carboxyhemoglobin (COHb) which reduces the capacity of

the blood to carry oxygen. Acute poisoning may cause

symptoms ranging from headache and breathlessness (at

COHb levels of 10% to 30%) through confusion to coma and

death (COHb usually greater than 60%). A particularly

insidious feature of CO poisoning is the development of

neurological problems such as movement disorders (often

resembling Parkinson’s disease), memory loss and altered

personality. Such problems may develop weeks after

apparent recovery from acute poisoning.

Chronic exposure to relatively low levels of CO may result in

a variety of symptoms including headache, fatigue, poor

concentration, dizziness, palpitations, chest pain, visual

disturbance, nausea, diarrhea and abdominal pain.

Chronic CO poisoning as a cause of such symptoms is often

missed.

The MicroCO allows immediate assessment of patients at

risk of CO poisoning who can then be rapidly referred for

expert assessment. Prompt treatment with oxygen (in a

hyperbaric chamber, if severe) is often life saving.

Screening for CO exposure may also reveal the cause of

non-specific symptoms relating to low level CO exposure

(usually as the result of faulty gas appliances).

References

Meredith T, Vale A, Carbon monoxide poisoning

British Medical Journal, 1988; 296, 77-78

Cigarette Consumption

The MicroCO provides a simple screening test for cigarette

consumption for use in all smoking cessation programs.

Measurement of carboxyhemoglobin has been well validated

as an indirect measure of cigarette consumption and is

widely used in smoking cessation programs.

Typical values for carboxyhemoglobin and expired CO in

smokers and poisoning victims, together with the alarm light

status, are given below:

CO (ppm)

%COHb

Cigarette

consumption

Indicator

0 –6

0 –1

Nonsmoker

Green

7 –10

1.1 –1.6

Light smoker

Amber

11 –72

1.8 –12

Heavy smoker

Red

>72

>12

Suspected

poisoning

Red +

alarm

Please note that some urban areas may have high

environmental levels of CO. This can cause a rise in

exhaled CO of a few ppm above that which is normally

present on the breath. In these cases it is possible for a

non-smoker to appear at the bottom of the ‘light smoker’

range (7 –10 ppm).

References

The relationship between alveolar and blood carbon monoxide

concentrations during breath holding

Jones RH, Ellicott MF, Cadigan JB, Gaensler EA

Journal of Laboratory and Clinical Medicine 1958; 51, 553 –564

Carbon monoxide in breath in relation to smoking and

carboxyhemoglobin levels

Wald NJ, Idle M, Boreham J, Baily A

Thorax 1981; 36, 366-369

Definition of a reliable threshold value for detecting current

smokers by CO measurement

Marino Luigi; Latini Roberto; Barbano Gina; Bazzerla Giorgio;

De Luca Anita, Nardini Stefano Respiratory and TB Unit-General

Hospital- Via forlanini, 71-I-31029-Vittorio Veneto (TV-ITALY).

Correlation between exhaled CO measurements and

carboxyhemoglobin percentage in smokers

Marino Luigi; Latini Roberto; Barbano Gina; Bazzerla; Zanette Antonia;

Nardini Stefano Respiratory and TB Unit- General Hospital- Via Forlanini,

71- I-31029-Vittorio Veneto (TV- ITALY).

Package Contents

The MicroCO is supplied with a carrying case containing the

following items:

1. MicroCO meter (Cat No. MC02)

2. 22 mm mouthpiece adapter (Cat No. PSA1800)

3. 22 mm reducing connector for calibration (Cat No.

MEC1007)

4. 9-Volt Battery

5. 4 Disposable mouthpieces (Bag 100 Cat No. 3301)

6. Calibration tool (Cat No. MEC1184)

micro

CO-PPM

OFF

Contraindications

There are no known contraindications for using the MicroCO.

Warnings and Cautions

The following terms are used as follows in this manual

Caution: Possibility of injury or serious damage

Warning: Conditions or practices that could result in

personal injury

Please Note: Important information for avoiding damage to

the instrument or facilitating operation of the instrument.

Note: The device should be used by trained and qualified

personnel.

CAUTION: Read the manual before use.

CAUTION: Do not attempt to charge the batteries, connect

improperly or dispose of in a fire as there is a possibility of

leakage or explosion. Follow manufacturer’s recommendations

for proper disposal.

WARNING: The instrument is not suitable for use in the

presence of explosive or flammable gases, flammable

anesthetic mixtures or in oxygen rich environments.

CAUTION: Mouthpieces are single patient use. If used on more

than one patient, there is a risk of cross-infection. Repeat use

may increase air resistance and lead to an incorrect

measurement.

PLEASE NOTE: The product and battery you have

purchased should not be disposed of as unsorted

waste. Please utilize your local recycling facility for

the disposal of this product.

PLEASE NOTE: Degree of protection against Ingress of Water

is IPX0.

CAUTION: When you connect the MicroCO to other

equipment, always make sure the whole combination complies

with the international safety standard IEC 60601-1 for medical

electrical systems. During measurements, connect the

MicroCO only to computers that comply with IEC 60601-1 /

ANSI/AAMI ES60601-1:2005 / CAN/CSA-C22.2 No. 60601-1:14

Intended Use

The MicroCO is intended to measure the amount of Carbon

Monoxide (CO) that can be expired from the breath. The

expired CO is measured in parts per million (ppm) and is

used to calculate the percentage of carboxyhemoglobin

(%COHb) in the blood.

The MicroCO is used in smoking cessation clinics, physician

offices, emergency departments and by the fire-fighting

services. In smoking cessation clinics, it is used for

instructional purposes to check on the client’s progress and

compliance. General practitioners, emergency room

personnel and the fire-fighting services can use the

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