Braebon Ultima 0580A, User Manual, Page: 21 / 28

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The Ultima Dual Airflow Pressure Sensor™ is a qualitative pressure sensor designed to measure
nasal and/or oral pressure associated with human respiratory activity. For qualitative purposes,
you do not need to calibrate the pressure sensor. However, you may obtain quantitative data when
you calibrate the pressure sensor with a water manometer.
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1. Connect the pressure sensor to the water manometer and the headbox of your recording
system as shown in Figure 9.
2. Using a manometer, apply a known pressure not exceeding ±25 cm H
2
O to the sensor input.
3. On your data acquisition system, set a corresponding voltage for the known pressure.
4. Repeat steps 2 and 3 for the remaining inputs.
On many data acquisition systems you will need to perform this procedure for a DC High
calibration (10 cm H
2
O) and for a DC Low calibration (-10 cm H
2
O). When the patient breathes in
(inspiratory flow), you should see a negative, upward tracing on your display.
Figure 9 Calibration Schematic
Pressure adjust syringe (10 cc)
Hydrophobic filter
Zero baseline adjust syringe (10cc)
Headbox
Note: The scale on the water manometer should be set to 1/2 the correct length. This is because 1 cm of water
movement in the tube moves the water 1 cm in the opposite direction in the other tube. This is equivalent to
2 cm of water pressure.
Recording System