Dräger Cato, Инструкция по эксплуатации, Страница: 104 / 148

Calibrate O
2
sensor for sidestream
measurement with 100% O
2
This is necessary for the monthly linearity check.
Prepare a substitute sampling line:
●
Cut the sampling hose through the middle.
●
Unscrew the original sampling hose from the water
trap and screw on the slit sampling hose.
On Cato:
●
Disconnect fresh gas hose from breathing system.
●
Set an O
2
flow of 1 L/min O
2
at the O
2
flow tube and
slide the sampling hose into the fresh gas hose.
●
Use the rotary control to select » calibrating « and then
» more «.
●
Select » O
2
sensor 100 Vol.%« with the rotary control.
●
Display:
●
Allow O
2
to flow for approx. 2 minutes.
● Press rotary control to confirm; calibration is then
started and continues automatically. The clock icon
(
✓
) is then replaced by a tick (
u
).
● Screw the original sampling hose back onto the
water trap.
●
Plug the fresh gas hose back into the breathing
system.
Check linearity
– Must be checked every month.
First calibrate the O
2
measurement used (inspiratory or
sidestream) with 100% O
2
(see above).
Then:
●
Expose the inspiratory O
2
sensor to ambient air for
approx. 2 minutes or,
in the case of the O
2
sensor for sidestream measurement:
●
unscrew the sampling hose from the water trap and
allow it to take in air for approx. 2 minutes.
Display on screen should show between
18 and 24 vol.% O
2
.
If value displayed is outside
18 to 24 vol.% O
2
sensor capsule is faulty.
Check operational readiness
Calibrate O
2
sensor for sidestream measurement
Check linearity
104
Standby / Configuration Alarms inactive!
O
2
sensor
100 vol. %
linearity
test O
2
CO
2
sensor
Expose end of sample line
to pure O
2
.
confirm !
calibrating
O
2
sensor
21 vol.%
flow sensor
Ventilator-
start up test
more
✓
✓
✓
✓
Standby / Configuration Alarms inactive!
First calibrate with
100 vol.% O
2,
then expose sensor
to ambient air for about
2 minutes
O
2
21
vol. %
If the displayed value is outside
the range 18 to 24 vol.% O
2
,
the sensor is defective.
calibrating
O
2
sensor
21 vol.%
flow- sensor
Ventilator-
start up test
more
After fast, confirm
O
2
sensor
100 vol. %
linearity
test O
2
CO
2
sensor
✓
✓
✓
✓
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