16-8
16.6.8 Setting Humidity Compensation
The CO
2
modules is configured to compensate CO
2
readings for either Body Temperature
and Pressure, Saturated Gas (BTPS), to account for humidity in the patient’s breath, or
Ambient Temperature and Pressure, Dry Gas (ATPD).
 ATPD:
100/%)()(
22 ambco
PvolCOmmHgP u
 BTPS:
100/)47(%)()(
22
u
ambCO
PvolCOmmHgP
Where,
2CO
P
= partial pressure,
%vol
= CO
2
concentration,
amb
P
= ambient pressure, and unit
is mmHg.
To set the humidity compensation:
1. Select the CO
2
parameter area or waveform area to enter the [CO2 Setup] menu.
2. Select [BTPS Compen] and then toggle between [On] and [Off].
 Switch on for BTPS.
 Switch off for ATPD.
16.7 Calibrating the CO
2
Module
A calibration should be performed once a year or when the readings go far beyond the range.
For details, refer to 25 Maintenance.
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