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34 Functional verification Welch Allyn Propaq CS Vital Signs Monitor
Mainstream CO
2
verification procedure
This procedure verifies the accuracy of the monitor’s mainstream CO
2
(MCO
2
) measuring
system. If verification test results exceed specification limits, calibration (“MSP Board
(MCO2) calibration” on page 54) MAY or MAY NOT be required—there are multiple
possible sources of errors in testing as listed in the table below.
1. Connect an MCO
2
sensor with airway adapter to the monitor MCO
2
input connector.
2. Turn on the monitor. Press SILENCE/RESET (software version 3.6x and greater)
or ALARM SUSPEND/RESUME (all other software versions) to disable the alarms.
3. Press SETUP > MORE > MORE > SERVICE > YES > MORE > MORE > SETTINGS
and then set the CO
2
measurement units to millimeters of mercury (mmHg).
4. Allow the monitor and sensor to warm up for at least 15 minutes.
5. After 15 minutes, verify that the CO
2
reading (of ambient room air) on the monitor
display is 1 mmHg, ±1 mmHg.
6. Install a rubber stopper in each end of the sensor airway adapter. (Refer to “Required
equipment” on page 14.)
7. Connect the CO
2
gas source through the hole in the stopper on one end of the airway
adapter. Leave the other end open.
8. Introduce a flow of test CO
2
at a rate of 60 to 200 ml/min into the sensor airway
adapter.
9. For test gas calculated partial pressure values of 30 mmHg or less, check the CO
2
reading on the monitor display to be within 3 mmHg.
10. For test gas calculated partial pressure values greater than 30 mmHg, check the CO
2
reading on the monitor display to be within ±10% of the partial pressure value.
11. Disconnect the test gas source and other test equipment.
12. Disconnect the CO
2
sensor from the monitor.
13. Turn off the monitor.
14. Log the test date and results in your department log.
Note
Possible errors may be caused if the area has high background CO
2
levels or if
CO
2
has been forced outside of the airway adapter and into the sensor itself. To
reduce the background CO
2
level, the area should be well ventilated and,
preferably, the technician should be the only person present. If CO
2
has been
forced into the sensor, allow 24 to 48 hours for the CO
2
to dissipate.
Note
Before performing the following steps, convert the percentage of the gas source
to partial pressure (mmHg) according to the procedures in Mainstream “CO2
verification preparation” on page 30.
Note
If CO
2
test results are out of specification limits, check the table below for
possible error sources. Always verify the test setup to minimize errors.