To change the gradient mode, press and hold the sun and the rain buttons
simultaneously for 3 seconds. The LED display will indicate the mode selected
(--- for Normal and HI for High).
To set a positive temperature gradient, press the sun icon for each positive
degree desired.
To set a negative temperature gradient, press the rain icon for each negative
degree desired.
Note: Adjust the gradient until adequate humidity is visible in the breathing circuit.
To accept the Temperature Gradient selection, press the accept button. The
humidifier will return to warm-up and normal operation. (See Figure 13 for
examples of high gradient settings)
To check the Temperature Gradient Mode while the humidifier is operating,
press the accept button:
When High Output Mode is active, the gradient icon will flash.
When normal temperature gradient is active, the gradient icon will be
continuously illuminated.
Automatic Gradient Adjustment
The ConchaTherm Neptune is intended to heat and humidify respiratory gases at a proximal
patient airway temperature selected by the clinician. In addition, the ConchaTherm Neptune
will allow the use of heated-wire circuits to minimize the condensation or "rainout" within the
circuit. Please note that certain environmental conditions will not allow the humidifier to
maintain both the proximal patient airway temperature and the temperature gradient at the
levels entered by the user. Under these conditions, the humidifier will automatically adjust
the temperature gradient in order to maintain the proximal patient airway temperature within
2°C of the selected temperature. Once the environmental conditions allow, the humidifier will
automatically return to utilizing the selected temperature gradient.
Note: In some conditions, the use of sun (or positive) gradient settings can result in
humidity outputs at the patient of less than 33mg H
2
O/L. Visually inspect for condensation
droplets in the inspiratory circuit after one hour of operation.
24
Figure 13: High Output Examples
&
Temperature Gradient in HI Mode
With Patient Temp set at 39 Deg and Gradient to -4 Deg
Column Temp would be at 43 Deg and Patient Temp at 39 Deg
This would significantly increase humidity and should only
be used to compensate for high inlet gas temperatures
Temperature Gradient in HI Mode
With Patient Temp set at 37 Deg and Gradient to -6 Deg
Column Temp would be at 43 Deg and Patient Temp at 37 Deg
This would significantly increase humidity and should only
be used to compensate for high inlet gas temperatures
Column Temp
Column Temp
Patient Temp
Patient Temp
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