SERVOPRO NOx Analyzers Page
RECOMMENDED GASES
Zero calibration for the SERVOPRO NOx requires ultra high-purity nitrogen (UHP N
2
)
or calibration-grade air, plus a span gas. The recommended span gas for this analyzer is
NO in a background of N
2
. NO in a background of air is not recommended as some of it
will convert to NO
2
.
Calibration gases can be introduced through the calibration ports on the back of the
analyzer (if optional solenoid valves have been installed) or through the sample inlet.
Gases introduced through a calibration port should be at 20-25 PSIG. If the calibration
gas is introduced through the sample port, pressures should be as follows:
1. With sample pump – no pressure.
2. Low-pressure configuration should be 3-7 PSIG.
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