Humidity Control - Dräger Caleo Instructions For Use Manual

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Humidity control

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Caleo provides the possibility for hygienic humidification of
the incubator air. In this system, water is supplied from a sepa-
rate water container (water bag or water tank) and heated.
With closed-loop humidity control, the desired relative humidity
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is set, and Caleo then automatically regulates the evaporator
output of the humidifier.
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Caleo can control the humidity in two ways:
– By manual input of the desired relative humidity or
– Automatic humidity control (AUTO humidity).
Manual humidity control
A value between 30 % and 99 % relative humidity can be set.
The actual humidity concentration is measured by the humidity
sensor in the patient capsule
(integrated in the sensor module at the patient's head end
of the capsule).
If the set value is higher than the actual measured relative
humidity (air too dry), the humidifier receives a signal to
allow more water vapour into the patient capsule. The
relative humidity inside Caleo
If the set value is lower than the actual measured relative
humidity (air too humid), the humidifier receives a signal to
allow less water vapour into the patient capsule.
The relative humidity inside Caleo
AUTO humidity
When AUTO mode is set, the set value for the relative humidity
is calculated and set automatically by the system as a function
of the air temperature (see graph).
This function is based on the observation that small and rela-
tively immature patients require both a higher air temperature
and higher relative humidity than larger patients. Consequently,
in AUTO mode, the set value for relative humidity is calculated
and set as a function of the air temperature. The lower the air
temperature setting, the lower the set value for relative
humidity.
* optional equipment feature
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therefore rises.
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therefore falls.
Automatic closed-loop humidity control
100
90
80
70
60
50
40
30
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10
0
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Set value for air temperature [˚C]
Description
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