GE Analytical Instruments ©2006 7-3 DML 14291 Rev. A
• The kit includes restrictors that permit exhalation at flow rates ranging from 30
– 250 mL/s. Select the desired restrictor (50 mL/s recommended by ATS) and
connect to the Luer port on the exhaust port.
For measurements, a single subject, disposable viral and bacterial filter is
installed on the mouthpiece. Also included in the kit is a sterilizable blue
mouthpiece (not shown), which can be installed on the inlet of the viral and
bacterial filter. The blue mouthpiece should be sterilized before use.
Connection of Thermal Mass Flowmeter
If the thermal mass flowmeter will be used for measurement of the exhalation
flow rate, connect the large end of the flowmeter to the Sievers mouthpiece on
the non-rebreathing valve and connect the bacterial and viral filter and blue
mouthpiece to the other end of the flowmeter. The flow direction arrow on the
flowmeter will point towards the non-rebreathing valve.
Rotate the flowmeter or valve so that the signal cable from the flowmeter to the
NOA is aligned with the Luer fittings on the mouthpiece of the valve.
Connection of Gas Sampling and Pressure Tubing
Connect the male Luer fitting on the gas sample line to one of the female Luer
ports on the mouthpiece of the valve. To avoid kinks in the tubing, rotate the male
Luer fitting 1/2 turn counterclockwise, then secure the tubing to the mouthpiece
by rotating the Luer fitting 1/2 turn clockwise. After the gas sampling line is
attached, connect the pressure line (PVC tubing with white adapter on end) to the
other female Luer port on the mouthpiece, again rotating the tubing 1/2 turn
counterclockwise before securing the pressure line to the mouthpiece with a 1/2
clockwise turn.
For ease of use, cable ties or twist ties can be used along the length of the gas
sampling and pressure lines to connect the two pieces of tubing. If the flowmeter
is being used, the flowmeter’s signal cable and the gas sampling and pressure lines
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