3-21
In the figure above,
1 A steel gas cylinder with 6±0.05% CO
2
2 Flowmeter
3 3-way valve (power supply controlled)
4 Open to air
5 Power supply (controlling two 3-way valves)
6 Compressed air or N
2
with standard concentration
7 Mainstream CO
2
sensor
8 Patient monitor
9 Tube (preventing back flow)
5 Adjust the power supply and turn on/off 3-way valves to ensure that that only one
cylinder is connected to the Mainstream CO
2
sensor via the 3-way valves at one time
and the flowmeter reading is stable and within 2 and 5L/min.
6 Switch between the two cylinders to connect Mainstream CO
2
sensor at an intervals of 6
to 10s and check if the displayed CO
2
value is within 6.0±0.3％.
3.4.9 Sidestream and Microstream CO
2
Module Tests
See section 3.2.3 Sidestream and Microstream CO
2
Module Tests.
3.4.10 AG Tests
See section 3.2.4 AG Tests.
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