Instructions for Use
– SCHMIDT
®
Flow Sensor SS 23.400 ATEX 3
Page 7
The following points must be observed:
The angle of tilting
4
to the flow direction should not exceed ±5° in order
to avoid significant measuring errors (> 1 %).
In inhomogeneous, laminar flow fields (for example a quasi-parabolic
speed profile in a pipe), the sensor tip should be positioned at a point
with the highest speed (adjustment of the immersion depth) because
this position normally has the largest distance to interfering elements
such as boundary surfaces.
Both the through-bolt joint as well as the wall mounting flange are
pressure-tight up to an overpressure of 500 mbar provided the instal-
lation has been carried out properly
5
.
The customer bears the responsibility for securing the sensor
against unintended discarding due to overpressure.
Flow with medium separation
To ensure the enclosure type of protection IP54 observe the fol-
lowing mounting drawing for media-separated installation using
the through-bolt joint or wall mounting flange (see for example
Figure 3-1).
Figure 3-1
4
Deviation between the measurement direction of the sensor head and flow direction.
5
The screw-in thread of the through-bolt joint must be sealed for this purpose, e.g. by
means of a copper seal or teflon tape.
!
Trough-bolt joint
532160
