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Automatic Zeroing
The ISA sidestream gas analyzer execute zeroing automatically by switching the gas sample from the
respiration circuit to the ambient air. To execute automatic zeroing once every 24 hours, the ISA sidestream
gas analyzer takes less than 3 seconds. If the ISA sidestream gas analyzer is equipped with an oxygen sensor,
automatic zeroing also includes the indoor air calibration of the oxygen sensor.
Manual Zeroing
Select [CO
2
] in the parameter area, in the [CO
2
Settings] menu popping up, select [Zeroing] to zero the CO
2
module. During zeroing, make sure that the patient circuit is exposed to the ambient air (21% oxygen and 0%
CO
2
) for approximately 30 seconds; when this menu is in a non default (settable) condition, zeroing can be
executed.
Warning
Since successful zeroing requires that the gas analyzer exists in the ambient air (21% oxygen and 0%
CO
2
), you should make sure that the ISA is placed at a well ventilated position. Before and after
executing the zeroing procedure, avoid breathing in the vicinity of the ISA sidestream gas analyzer.
16.10.2
CO
2
Module Lighting Information
Overview of States Indicated by LEGI:
Indicating Signal
State
Not blinking green light
The system is normal
Blinking green light
Zeroing
Not blinking red light
Sensor Error
Blinking red light
Checking the sampling tube
16.10.3
Others
The operating methods for CO
2
analyzers and AG analyzers produced by the PHASEIN company are
identical. Therefore, for such contents as ―adverse effects on performance, safety warning messages,
airway obstruction, consumables, safety symbol information, patent and trademark, analyzer maintenance
and cleaning‖ with respect to the CO
2
analyzer described in this section, the user can refer to relevant
contents in Chapter 18, Anesthetic Gas Measurement.
