Mindray iPM-9800 - Setting up Humidity Compensation

16-6
For the microstream CO
2
module, gas compensations are not required.
For the maintream CO
2
module, in the [CO
2
Setup] menu, respectively select:
 [Balance Gas] and toggle between [Room Air], [N
2
O] and [He]. Select [Room Air]
when air predominates in the ventilation gas mixture, [N
2
O] when N
2
O predominates in
the ventilation gas mixture, and [He] when He predominates in the ventilation gas
mixture.
 [O
2
Compen] and then select [Off] or an appropriate setting according to the amount of
O
2
in the ventilation gas mixture. When the amount of O
2
is less than 30%, you’d better
switch this compensation off.
 [AG Compen] and enter the concentration of anesthetic gas present in the ventilation
gas mixture. This could compensate for the effect of AG on the readings.
16.3.4 Setting up Humidity Compensation
Sidestream and microstream CO
2
modules are 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).
1. ATPD:
100/%)()(
22 ambco
PvolCOmmHgP
×
=
2. BTPS:
100/)47(%)()(
22
−
×
=
ambCO
PvolCOmmHgP
Where,
2CO
P
= partial pressure,
%vol
= CO
2
concentration,
amb
P
= ambient pressure, and
unit is mmHg.
As the mainstream CO
2
module has a built-in heating component to prevent water vapor from
condensing, setting humidity compensation is not needed. For the sidestream and
microstream CO
2
module, you can set the humidity compensation on or off according to the
actual condition. To set the humidity compensation::
1. In the [CO
2
Setup] menu, select [Humidity Compen].
2. Select either [On] for BTPS or [Off] for ATPD, depending on which compensation
applies.