The single valve turns a total of nine and a half times; the first two and a half turns utilize the slight, minute changes for the pediatric animal patient while the remaining rotations are to be used with the adult and extra-large sized bellows and housings.

Low 50 psi Supply Gas Alarm – The Low Supply Gas Alarm is activated when the supply gas pressure drops below 35 psi (2.4 bar). During an alarm condition, the red light on the front panel is illuminated and a steady, continuous tone is heard. This alarm automatically resets when the pressure increases above 40 psi (2.7 bar).

All Hallowell Ventilators are equipped with dual airway pressure alarms that monitor and sound when the Peak Inspiratory Pressure (PIP) of any breath either exceeds the preset Maximum Working Pressure Limit (MWPL) or fails to reach 6 cm H2O as in the case of a disconnect.

Volume – Cycled microprocessor-controlled ventilator.

Time cycled – Ensures consistently spaced breaths. The possibility of stacking breaths or auto-PEEP is eliminated by keeping the I:E ratio constant at 1:2. This means that regardless of the respiratory rate, setting two-thirds of the breath will remain for expiration. The respiratory rate is adjustable from 6 – 40 breaths per minute (BPM).

Volume constant – Ensures that each delivered breath will have essentially the same volume, independent of changes in patient compliance and airway resistance. The deliverable tidal volume (TV) range is from approximately 20 cc to 3,000 cc.

Pressure Limited – Provides for patient safety by limiting the maximum working pressure (MWPL) to a user adjustable pressure range of 10 – 60 cm