Teledyne 9110T Cylinders, Available, Calibration Span GAS, NIST-SRM Type Nominal Concentration

Model 9110TH NOx Analyzer Getting Started

∙Pure nitrogen (N2) could be used as a zero gas for applications where NOX is measured in nitrogen.

∙If your analyzer is equipped with an external zero air scrubber option, it is capable of creating zero air from ambient air.

∙For analyzers without the external zero air scrubber, a zero air generator such as the Teledyne Model 701 can be used. Please visit the company website for more information.

CALIBRATION (SPAN) GAS

Calibration gas is a gas specifically mixed to match the chemical composition of the type of gas being measured at near full scale of the desired reporting range. To measure NOX with the 9110T NOX analyzer, it is recommended that you use a span gas with an NO concentration equal to 80% of the measurement range for your application

EXAMPLE:

∙If the application is to measure NOX in ambient air between 0 ppm and 500 ppb, an appropriate span gas would be 400 ppb.

∙If the application is to measure NOX in ambient air between 0 ppm and 1000 ppb, an appropriate span gas would be 800 ppb.

Even though NO gas in nitrogen could be used as a span gas, the matrix of the balance gas is different and may cause interference problems or yield incorrect calibrations.

∙The same applies to gases that contain high concentrations of other compounds (for example, CO2 or H2O).

∙The span gas should match all concentrations of all gases of the measured medium as closely as possible.

Cylinders of	the following types of calibrated NOx and NO gas traceable to NIST standards specifications
(also referred to as EPA protocol calibration gases or Standard Reference Materials) are commercially
available.
		Table 3-8:	NIST-SRM's Available for Traceability of NOx Calibration Gases
		NIST-SRM4		TYPE	NOMINAL
					CONCENTRATION
		2627a		Nitric Oxide (NO) in N2	5 ppm
		2628a		Nitric Oxide (NO) in N2	10 ppm
		2629a		Nitric Oxide (NO) in N2	20 ppm
		1683b		Nitric Oxide (NO) in N2	50 ppm
		1684b		Nitric Oxide (NO) in N2	100 ppm
		1685b		Nitric Oxide (NO) in N2	250 ppm
		1686b		Nitric Oxide (NO) in N2	5000 ppm
		1687b		Nitric Oxide (NO) in N2	1000 ppm
		2630		Nitric Oxide (NO) in N2	1500 ppm
		2631a		Nitric Oxide (NO) in N2	3000 ppm
		2635		Nitric Oxide (NO) in N2	800 ppm
		2636a		Nitric Oxide (NO) in N2	2000 ppm
		2631a		Oxides of Nitrogen (NOx) in N2	2500 ppm
		1684b		Oxides of Nitrogen (NOx) in N2	100 ppm
Note		The NO2 permeation tube included with the 9110T’s optional Internal

Teledyne Analytical Instruments 57