GE Analytical Instruments ©2006 8-10 DLM 14291 Rev. A
Figure 8-4:
Divert Valve Operation
Instructing the Subject and Collecting the Samples
• Have the subject comfortably seated and holding the bag filler level.
• Have the subject place the mouthpiece in their mouth and position their hand
on the divert valve.
• With the valve pulled out, have the subject inhale orally through the
inspiratory filter to total lung capacity.
• Have the subject to immediately exhale while watching the pressure gauge and
adjusting the force of exhalation to maintain a pressure of 5 cm H
2
O for a flow
of 50 mL/s BTSP
*
• After exhaling for 4 – 6 seconds, have the subject push the divert valve to the
in position to start collecting gas in the bag.
• The subject must continue exhaling, while maintaining a pressure to 5 cm H
2
O
for 5 to 6 seconds to collect 250 to 300 mL of gas in the bag.
* at 760 torr, for other pressures, calculate the required pressure from the equation:
Flow = (760/P
Bar
(torr)) * 21.1 * P
exh
0.533
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