Teledyne T200H/M

Teledyne API - Model T200H/T200M Operation Manual Getting Started

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 calibrated NO gas traceable to NIST-standard reference materials

specifications (also referred to as EPA protocol calibration gases) are commercially

available.

Table 3-9: NIST-SRM's Available for Traceability of NOx Calibration Gases

NIST-SRM4 TYPE NOMINAL

CONCENTRATION

2627a

2628a

2629a

Nitric Oxide (NO) in N2

5 ppm

10 ppm

20 ppm

1683b

1684b

1685b

1686b

1687b

Nitric Oxide (NO) in N2

50 ppm

100 ppm

250 ppm

5000 ppm

1000 ppm

2630

2631a

2635

2636a

Nitric Oxide (NO) in N2

1500 ppm

3000 ppm

800 ppm

2000 ppm

2631a

1684b

Oxides of Nitrogen (NOx) in N2

3000 ppm

100 ppm

Note If a dynamic dilution system such as the Teledyne API Model T700 is used

to dilute high concentration gas standards to low, ambient

concentrations, make sure that the NO concentration of the reference gas

matches the dilution range of the calibrator. Choose an NO gas

concentration that is in the middle of the dilution system’s range.

07270B DCN6512