22 - 8 BeneVision N22/N19 Patient Monitor Operator’s Manual
22.6.2 Zeroing the Mainstream CO
2
sensor
For mainstream CO
2
modules, the sensor should be zeroed in the following conditions:
â– Before each measurement.
â– A new adapter is used.
â– Reconnect the sensor to the module.
â– The message CO2 Zero Required displays. In this case, check the airway adapter for any blockage, e.g.
mucus, etc. If a blockage is detected, clear or replace the adapter.
To zero the sensor, follow this procedure:
1. Connect the sensor to the module.
2. In the
CO2 menu, select Setup tab.
3. Set the
Operating Mode to Measure. The message CO2 Sensor Warmup is displayed.
4. After warm-up is finished, connect the sensor to a clean, dry airway adapter. The adapter should be vented
to the air and isolated from CO
2
sources, such as ventilator, the patient’s breathing, your own breathing, etc.
5. Select
Zero in the CO2 menu. The message Zeroing is displayed.
It takes about 15 to 20 seconds. The message disappears when the zero calibration is completed.
• When perform a zero calibration during the measurement, disconnect the sensor from the patient’s
airway first.
• Please do not rely on the readings during zeroing.
22.7 Changing Settings for All CO
2
Modules
22.7.1 Changing CO
2
Alarm Settings
To change the CO
2
alarm settings, follow this procedure:
1. Select the CO
2
numeric area or waveform area to enter the CO2 menu.
2. Select the
Alarm tab.
3. Set the following alarm properties:
â—† Switch on or switch off the alarms or alarm recording.
â—† Adjust the alarm limits or alarm priority.
â—† Select Apnea Delay to set the delay time of the apnea alarm.
22.7.2 Changing the CO
2
Unit
To change the CO
2
unit, follow this procedure:
1. Select the
Main Menu quick key → turn to the third page → from the System column select Maintenance
→ input the required password → select Ok.
2. Select the
Unit tab.
3. Set
CO2 Unit..
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