Dräger Cato - Calibrate O Sensor for Sidestream Measurement with 100% O; Linearity; Power Failure Alarm

Calibrate O2 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 O2 flow of 1 L/min O2 at the O2 flow tube and
slide the sampling hose into the fresh gas hose.
● Use the rotary control to select »calibrating« and then
»more«.
● Select »O2 sensor 100 Vol.%« with the rotary control.
● Display:
● Allow O2 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 O2 measurement used (inspiratory or
sidestream) with 100% O2 (see above).
Then:
● Expose the inspiratory O2 sensor to ambient air for
approx. 2 minutes or,
in the case of the O2 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.% O2.
If value displayed is outside
18 to 24 vol.% O2
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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