BCI Capnocheck Plus - Page 9

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Chapter

1:

Introduction

NOTE:

Significant

levels

of

dysfunctional

hemoglobins,

such

as

carboxyhemoglobin

or

methemoglobin,

will

affect

the

accuracy

of

the

SpO2

measurement.

NOTE:

SpO»

measurements

may

be

adversely

affected

in

the

presence

of

high

ambient

light.

If

necessary,

shield

the

probe

area

(with

a

surgical

towel,

for

example).

NOTE:

Remove

fingernail

polish

or

false

fingernails

before

applying

SpO2

probes.

Fingernail

polish

or

false

fingernails

may

cause

inaccurate

SpO2

readings.

NOTE:

Store

the

FiO:

cell

as

shipped

in

its

protective

wrapping,

until

it

is

ready

to

use.

This

maximizes

the

FiO,

cell’s

shelf

life.

NOTE:

Prolong

FiO}

cell

life

by

avoiding

high

O;

and

CO;

concentrations

when

it

is

not

in

use.

NOTE:

FiO,

Humidity

and

Pressure

Compensation:

Humidity

(i.e.

water

vapor)

is

not

an

interferent,

and

does

not

affect

the

FiO2

cell

accuracy.

Water

vapor

behaves

as

any

diluting

gas

and

reduces

the

oxygen

partial

pressure;

the

FiOz

cell

will

correctly

indicate

the

reduced

percent

FiOz.

However

when

calibrating

the

FiOz

celi,

the

humidity

of

the

calibration

gas

reduces

the

oxygen

partial

pressure,

it

is

for

this

reason

that

calibration

gas

must

be

dry.

For

example,

at

37°C,

water vapor

pressure

(PH20)

is

47

mmHg,

reducing

the

oxygen

partial

pressure

of

100%

oxygen

to

(760-47) 713

mmHg

and

results

in

an

oxygen

concentration

of

94%.

If

the

sensor

must

be

calibrated

with

humidified

oxygen,

then

if

the

calibration

gas

is

100%

humidified,

the

following

equation

provides

a

correction

factor

that

must

be

applied

to

all

FiO2

readings:

Peal

-

PH20

CH2o

=

一

一

一

(1)

Peal

In

addition,

if

the

pressure

of

the

calibrating

gas

(Pcal)

is

not

760

mmHg,

then

a

further

correction

can

be

made

according

to

the

following:

Peal

Cal

=

————

(2

760

mmHg

The

FiO,

cell

manufacturer

specifies

an

operating

pressure

(Psys)

range

of

+/-

200

mmHg

(+/-

4

psig).

The

FiO,

cell

response

is

proportional

to

oxygen

partial

pressure,

the

result

being

that

indicated

FiO,

can

be

corrected

for

the

difference

in

pressure

between

the

operating

system

and

the

calibrating

system

pressure.

The

correction

can

be

obtained

from

the

following

equation:

760

mmHg

csys

=

一

一

一

(8)

Psys

The

final

result

is

that

actual

FiO2

can

be

calculated

from

indicated

FiOg

by

combining

equations

1,

2

and

3:

FiOz

(actual)

=

FiOz

(indicated)

*

CH2O

*

Ccal

*

Csys

(4)

Capnocheck

Plus

Service

Manual

、 -

1-8

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