Which of the following is false about a simple heated humidifier (one that does not incorporate a servo-control mechanism)?
a. The controller regulates the heating ele-ment's electric power.
b. The controller monitors the temperature of the heating element.
c. The controller varies current to achieve a set airway temperature.
d. The patient's airway does affect the con-troller.
ANS: D
Humidifier heating systems also have a controller that regulates the element's electric power. In the simplest systems, the controller monitors the heating element, varying the delivered current to match either a preset or an adjustable temperature. In these systems, the patient's airway temper-ature has no effect on the controller.
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