GE Analytical Instruments ©2006 DLM 14291 Rev. A
1-6
• Purge vessel for the measurement of NO, nitrite, nitrate and other reaction
products in liquid samples. The purge vessel can also be used for headspace
analysis with a gas-tight syringe.
• Accurate NO™ Exhaled Breath Kit for on-line measurement of exhaled NO using
elevated pressure to close the soft pallet and constant low exhalation flow (30
– 250 mL/s BTPS)
• Bag Collection and Sampling Kit for off-line measurement of exhaled NO using
collection in Mylar® bags.
Sample Flow Control Device
The vacuum pump continuously draws gas into the analyzer at a constant flow
rate. A porous metal frit restrictor sealed in a 1/8" adapter is connected to a
Swagelok
®
bulkhead union at the rear of the NOA. The standard restrictor provides
a flow rate of ~200 mL/min and restrictors for other flow rates are available from
Sievers Instruments.
Ozone Flow Control Module
The connection for the gas supply for the ozone generator (oxygen or 95% O
2
/ 5%
CO
2
) is made using Teflon tubing and a Swagelok bulkhead connector. The gas
must be a regulated supply from an external cylinder, lecture bottle or house
oxygen. The flow rate of gas into the ozone generator (~30 mL/min) is controlled
using a regulator and small diameter tubing restrictors. The regulator and
bulkhead connectors are located on the back of the NOA. The regulator is adjusted
to 6 psi pressure, which is measured by a pressure transducer, and monitored on
the front panel display.
Ozone Generator
An electrostatic ozone generator and high voltage transformer are used to
generate ozone at a concentration of ~2% by volume from oxygen. This large
excess of ozone is sufficient for measurement of NO up to 500 ppm.
Chemiluminescent Reaction Chamber and Optical Filter
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