This compact 3 U high 19” rack enclosure houses both the NOx converter as well as a self contained heated filter and calibration gas selection valve. It is generally used with the Signal Group S4 PULSAR multi-gas analyser or to check converter efficiencies.

What Makes an Analyser “Reference Standard”?
Setting the Standard in Gas Analysis: Why Reference Methods Matter In the rigorous domains of emissions monitoring, industrial process control, and advanced atmospheric research, the precision and reliability of gas analysis instrumentation are not merely advantageous; they are foundational to regulatory compliance, environmental stewardship, and scientific advancement. The designation of