A sample stream consists of one analyzer or several analyzers supplied with the same sample gas – this means that they are supplied with the same sample gas pump.
For example, an emission test system for untreated exhaust gas may have two streams:
 The exhaust flow could supply one stream.
 The EGR CO2 analyzer would then be installed in a second stream.
The emission bench can have two main streams and one secondary stream per test cabinet.
A main stream is a sample stream in which an exhaust flow is analyzed for several different gases, such as CO2, CO, NOx, HC, O2, etc.
A secondary stream is a sample stream with a gas flow for a specific unit which serves to analyze an individual component, such as in a:
 tunnel FID
 EGR CO2
 tracer CO2

Где что как назвать? Stream - поток, а flow - течение, струя??
Спасибо!