8.1 Reserving inlet and outlet sections
Because the thermal measuring principle may be sensible to inlet and
outlet conditions, we recommend the following minimum straight inlet
and outlet sections be reserved to ensure an accurate measurement.
The S401 sensors should be always installed upstream from obstacles
like valves, filter, reductions etc. In common, sensors should be installed
as far as possible away from any disturbances.
Remark: If there is any combination of the below situations, the longest
straight inlet section must be maintained.
• Expansion • Reduction
• 90° Bend • 2 x 90° Bend
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