11
III. Theory introduction
1 The measuring principle:
The device working theory is NON-DISPERSIVE INFRA RED GAS ANALYZER.
The device has an AUTO ZERO ADJUSTMENT SYSTEM and GAIN
CONTROL
2 Automatic Offset Calibrations
The device was designed to automatically perform calibrations in order to
correct for changes in temperature, altitude and electronic component drift.
The air surrounding the device may have elevated concentrations of CO
2
present (such as in an enclosed compartment or room with poor ventilation).
Therefore, we recommend use in well ventilated locations to ensure that the
CO
2
baseline does not cause inaccuracy.
3 The Moisture Separation System:
This instrument uses a patented filter/water trap T3 which can filter a large
amount of moisture whilst maintaining a minimum dead space thereby
improving the accuracy of the waveform. PLEASE NOTE that if the
filter/water trap becomes full of water or dirt the display will show
"OCCLUSION ', the operator needs to change the filter/water trap T3. The old
filter can be reused after natural drying in a ventilated and dry environment.
Discard the old filter/water trap if dirty.
IV. Oxygen saturation measurement (optional)
1. It is also recommended to use Pulse Oximetry for ventilated or sedated
patients. Measurement will begin when your finger is put into the sensor clip,
meanwhile, the photoplethysmogram wave will appear on the screen, after
several seconds the oxygen saturation and pulse rate appear. The monitor
will give a pulse tone sound when each heart beat happens. The tone will
change to an alarm tone if the values of SpO
2
and Pulse Rate breach the
alarm level settings. The volume of pulse beep can be adjusted by the item
BEEP VOLUME
in the SOUND SET menu. The pulse beep tone will
disappear under the silent condition.
Figure 4