Instructions for Use
– SCHMIDT
®
Flow Sensor SS 20.500
Page 7
The probe element of the
SS 20.500
consists of two basic elements (see
The heated measuring element in the probe tip (heater):
The barbell-shaped probe tip enables an omnidirectional flow meas-
urement vertically to the longitudinal axis of the probe. Furthermore,
the flow guiding disks allow deviation from the strictly vertical direction
of recording of up to
45° (see Figure 3-1) without significant impact
on the measurement result
7
.
The centre of the barbell-shaped element also referred to by specifi-
cation of probe length (L) is the actual measuring point of the flow
measurement and must be placed in the flow as advantageous as
possible, for example in the centre of the pipe (also see Figure 3-5).
Position the barbell-shaped segment always at the position
advantageous for the flow measurement.
The measuring sleeve for medium temperature recording (T-sleeve):
The sleeve must be positioned directly in the flow field (see Figure
3-2) to be able to detect changes of the medium temperature directly.
Figure 3-2
The minimum immersion depth (MID) of the probe required here is
58 mm. The sleeve must not contact the mounting fixture, the wall or
similar because this will cause interference to the flow and tempera-
ture measurement.
The temperature-measuring sleeve must be positioned di-
rectly in the main flow.
7
Deviation < 1 % of the measured value
!
T
min
!
MID
Heater
T-sleeve
