Dräger caleo - Skin Temperature Control

Theory of Operation
155
Operating Instructions Caleo, Software 2.n
Skin Temperature Control
With the "Trend Main Page" option selected from the main
menu, the user can preconfigure which trend to display when
switching from numerical to trend display.
In addition to displaying the two skin temperatures, the display
can show the following parameters: air temperature, humidity
*
,
oxygen
*
and the weight
*
, with a memory of up to 30 weight
readings.
Skin Temperature Control
When Caleo is operated in skin temperature mode, this mode
can be set on the control unit. At least the yellow skin tempera-
ture sensor (Skin 1) must be plugged in and be properly
attached to the infant. The user sets the setpoint for skin
temperature on the control unit. The infant’s actual skin
temperature is measured by the yellow skin temperature
sensor (Skin 1) and compared with the setpoint.
The difference between setpoint and measured actual value is
used to control the air temperature in Caleo between a
minimum of 20
o
C and a maximum of 39
o
C.
If the setpoint is higher than the currently measured skin
temperature (skin too cold), the heater receives a signal to
supply more heat. The air temperature in Caleo rises, thereby
also increasing the infant’s skin temperature.
If the setpoint is lower than the actual measured skin tempera-
ture (skin too hot), the heater receives a signal to apply less
heat. The air temperature inside Caleo drops, thereby also
reducing the infant’s skin temperature.
The longer the deviation between the set value and the actual
measured value persists, the more powerfully heat is supplied
by the heater (if the skin is too cold) or the more the air temper-
ature in Caleo is reduced (if the skin is too warm).
Wait for the controller to reach steady state.
The infant's skin temperature varies frequently, e.g. due to food
intake or medical care. Deviations of a few tenths of a degree
are normal.
Therefore:
Only change the set value of the skin temperature if the
intention is to change the infant’s (central) temperature.
If the actual skin temperature deviates from set skin tempera-
ture by more than ±0.5
o
C
**
, an audible alarm is triggered.
This audible alarm can be silenced by the user. As soon as the
measured value deviates from the set value by less than
±0.5
o
C
**
(see above), the alarm is deactivated again.
* optional equipment feature
** other configurations possible
126
Actual value
Set value
controls
Skin temperature Air temperature
Skin temperature Air temperature
Actual value
Set value
controls