Instructions for Use
– SCHMIDT
®
Flow Sensor SS 20.600
Page 9
Thermal boundary conditions
In the case of medium temperatures that exceed or fall below the permis-
sible ambient temperatures of the electronics, cross-talk of the tempera-
ture into the electronics housing must be prevented by a cooling or warm-
ing-up distance of the sensor tube of at least 50 mm (see Figure 3-1) or
other suitable measures.
Figure 3-1
The permissible operating temperature range of the electronics
must not be exceeded by crosstalk of the medium temperature on
the sensor housing.
Flow characteristics
Local turbulences of the medium can cause distortion of measurement
results. Therefore, appropriate mounting conditions must be guaranteed
to ensure that the gas flow is supplied to the sensor in a laminar
4
, i.e. quiet
and low in turbulence, state. The corresponding measures depend on the
system properties (pipe, chamber, etc.) which are described in the follow-
ing subchapters for different mounting variants.
Correct measurements require a (laminar) flow low in turbulence.
4
The term “laminar” means here an air flow low in turbulence (not according to its physical
definition saying that the Reynolds number is < 2300).
