Theory of Operation
153
Operating Instructions Caleo, Software 2.n
Airflow
Air Temperature Control
Airflow
The heated and humidified air flows into the incubator hood
from both sides. It is guided up the inside of the front door,
along the hood canopy and then down the two transverse
sides by suction. The air from the interior is mixed with fresh
ambient air by an air filter and is circulated by a fan. Along this
path, the air is channeled past an electrically powered heater
and is humidified if necessary
*
.
The infant lies in a calm zone with low airflow velocity.
Convective heat loss is therefore kept to a minimum. When the
large access doors or access ports (Caleo JumboPorts
™
), are
open, an efficient warm air curtain prevents cooling of the
patient capsule.
Air Temperature Control
The user sets the desired air temperature in the patient
capsule on the incubator control unit (setpoint for air tempera-
ture in air temperature mode). The current air temperature is
measured by the air temperature sensor in the patient capsule
(at the infant's head end of the incubator) and is then
compared to the setpoint. If the set value is greater than the
actual measured air temperature, the heater receives the
signal to apply more heat. The air temperature inside Caleo
therefore increases. If the setpoint is lower than the actual
measured air temperature, the heater receives the signal to
apply less heat. The air temperature inside Caleo drops. If the
current air temperature deviates from the set value by more
than ±1.5
o
C
**
, an alarm is triggered.
The audible signal of this alarm can be muted by the user.
As soon as the deviation in the measured air temperature is
within ±1.5
o
C
**
of the set value (see above), the alarm is
cancelled.
* Available option
** Other configurations possible, see "Configuring alarm settings",
page 107.
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