This regulator must have a non-reactive diaphragm and internal parts and a suitable delivery pressure.Ģ.2.6 Drier. (Rotameters have been reported to operate unreliably when measuring low NO flows and are not recommended.)Ģ.2.5 Pressure regulator for standard NO cylinder.
A calibrated flowmeter capable of measuring and monitoring NO flowrates with an accuracy of ☒% of the measured flowrate. Calibrated flowmeters capable of measuring and monitoring air flowrates with an accuracy of ☒% of the measured flowrate.Ģ.2.4 NO flowmeter. Component parts in contact with the NO must be of a non-reactive material.Ģ.2.3 Air flowmeters. A device capable of maintaining constant NO flows within ☒% of the required flowrate. Devices capable of maintaining constant air flows within ☒% of the required flowrate.Ģ.2.2 NO flow controller.
All connections between components downstream from the permeation device should be of glass, Teflon ®, or other non-reactive material.Ģ.2.1 Air flow controllers. A typical system suitable for generating the required NO and NO 2 concentrations is shown in Figure 2. An NO concentration standard is used for calibration of the NO and NO X channels of the analyzer.Ģ.2 Apparatus. The NO 2 emitted from the device is diluted with zero air to produce NO 2 concentrations suitable for calibration of the NO 2 channel of the NO/NO X/NO 2 analyzer. ( 10) The permeation device emits NO 2 at a known constant rate provided the temperature of the device is held constant (☐.1 ☌) and the device has been accurately calibrated at the temperature of use. Atmospheres containing accurately known concentrations of nitrogen dioxide are generated by means of a permeation device.
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