Dräger Isolette 8000 plus - Humidification system (option)

178 Instructions for use Isolette 8000 plus SW 5.n
Principles of operation
16.3 Oxygen system
The Isolette 8000 plus is equipped with either a servo oxygen control system or a
manual oxygen control system.
16.3.1 Servo oxygen control system (option)
When installed, the servo oxygen control system maintains oxygen concentration
within the hood via a valve and an oxygen sensor module. The sensor module
houses 2 independent oxygen fuel cells. Oxygen concentration is displayed on the
screen, and oxygen-related alarm conditions are indicated to the user via acoustic
and optical alarms.
When the sensor module is outside of the hood during oxygen control mode,
acoustic and optical alarms are enabled and the flow of oxygen is interrupted.
16.3.2 Manual oxygen control system (option)
With the manual oxygen control system, oxygen flow is controlled by an external
flowmeter. Oxygen concentration is not displayed on the Isolette 8000 plus screen
and no oxygen alarms are generated. To achieve desired oxygen concentration,
use a calibrated oxygen analyzer.
16.4 Humidification system (option)
When installed, the built-in humidifier provides humidification of the incubator air by
evaporating boiling water from the water reservoir. With closed-loop humidity
control, only the desired relative humidity set point is entered. The system then
automatically controls the humidifier output of the humidifier to maintain the preset
relative humidity in the patient compartment.
Isolette 8000 plus allows 2 modes to control humidity during incubator operation:
– Automatic humidity set point selection (Auto humidity)
– Manual adjustment of humidity set points
If the humidity has not risen to a predetermined threshold within a designated time,
an audible and visual Low Humidity alarm occurs.
16.4.1 Humidity control
The actual humidity level is measured by a humidity sensor in the patient
compartment. If the set point is higher than the actual measured relative humidity
(air too dry), the humidifier receives a signal to allow more water vapor into the
patient compartment. Relative humidity inside rises.
If the set point is lower than the actual measured relative humidity (air too humid),
the humidifier receives a signal to allow less water vapor into the patient
compartment. Relative humidity inside falls.
16.4.1.1 Auto humidity
In auto mode, the set point for the relative humidity is calculated and set
automatically by the system as a function of air temperature. This function is based
on the observation that small and relatively immature infants require both a higher
air temperature and higher relative humidity than larger infants.