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Measurement Principle for Anesthetic Gases:
Measure the AG concentration based on the AG ability of absorbing infrared rays. All gases
to be measured by the AG module should be able to absorb infrared rays, and each gas has its own
absorption characteristics. The gas is transmitted to a sampling room and passed through by the
infrared rays of a specific frequency band selected by an infrared ray filter. When you measure
more than one gas, there will be more than one infrared ray filter. The higher the gas concentration
within the given volume is, the more infrared rays will be absorbed and the smaller transmission
amount of infrared rays will pass through the gas. You can work out the gas concentration by
measuring the transmission amount of infrared rays.
Measurement Principle for Oxygen:
Since oxygen can not absorb infrared rays, you can measure the oxygen concentration based
on its paramagnetic characteristics. Inside the sensor of oxygen module, there are two crystal balls
filled with nitrogen hung in symmetrical magnetic fields with the help of a torsion device. In case
of different oxygen concentrations, the crystal balls will have different deviations under the action
of magnetic fields and there will be different moments acting on the torsion device. You can work
out the oxygen concentration by measuring the moment.
18.3 AG Display
Select “Module Switch” from “Monitor Setup” in the main menu to set the AG module as “On",
and then return to the main menu to select “AG Interface” from “Work Interface”. See the figure
below:
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