1.5 Instrument Description
The major components of the Serinus 40 are described below:
Figure 2 – Internal components diagram
1.5.1 Calibration Valve Manifold
The calibration valve manifold switches between sample, calibration and background gas.
1.5.2 Auxiliary Valve Manifold
The auxiliary valve manifold switches sample gas between NO and NO
X
channels along with
background and bypass flow.
1.5.3 Particulate Filter
The particulate filter is a Teflon 5 micron (µm) filter with a diameter of 47mm. This filter eliminates
all particles larger than 5µm that could interfere with sample measurement.
1.5.4 Delay Loop
The delay loop is a coil of sample tubing which increases the length of time sample air takes to travel
to the NO
2
to NO converter and the measurement chamber. This delay allows a single sample to be
split into the NO channel and the NO
x
channel and measured sequentially without introducing a lag
on the measurement of the NO
x
channel. I.e. The sample of NO
x
gas is taken at the same time as the
NO, but measured after the NO, in the same cell.
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