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FM1 - Turbine-type monitoring heads (TST)
Preamplifier for monitoring head TST-..HM2
Advantages of mechanical flow rate sensing
●
●
Wide medium temperature range: 0 °C to +250 °C,
independent of temperature variations
Short reaction time
35
64
1.38
ground GND
2.52
Limitations:
● not suitable for media with solid particles
● can be overloaded only to a limited extent
3
2
1
output Ua
from monitoring head HM2
● measuring signals depend on the viscosity of the medium
● shock-sensitive
Installation of monitoring head
Flow monitoring is often necessary in places that are not accessible
and where practical difficulties may prevent the correct alignment of
the sensors with respect to flow direction. The special aerodynamic
1
Description
Electronic flow meters with mechanical sensing rely upon a turbine
mounted in the pipeline. The rotational speed of the turbine in the
flowstream is proportional to the flow rate. Turbine rotation is remotely
measured by an inductive proximity switch and transmitted as a
frequency signal to the electronic control unit.
shape of the E-T-A sensors reduces this danger. The following
diagram clearly shows that the “streamlined” E-T-A sensors have a
very good alignment angle.
Mechanical sensing by means of turbine-type sensors is
recommended:
● where temperatures may be above the temperature range of the
calorimetric heads (>130 °C),
error
(at 10 m/s)
± 1.5 % system
+10 % tolerance band
Streamline sensors are largely insensitive to
oblique streaming (symmetrical to 0 ° line)
+25 ° -25 °
●
●
●
where the media may change,
where the properties (thermal conductivity) of the medium may
vary significantly,
for media with air bubbles,
0
-10 %
●
where an immediate response to flow rate changes is required.
-20 %
streamline sensor
+40 °
+30 °
+20 °
+10 °
0
-10 °
-20 °
-30 °
-40 °
oblique streaming
Monitoring head with turbine-type sensor
pipe
turbine
06/07 (230207)
www.e-t-a.com
1 - 63
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