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FM1 - Turbine-type monitoring heads (TST)
Description
Advantages of mechanical flow rate sensing
Electronic flow meters with mechanical sensing rely upon a turbine
mounted in the pipeline. The rotational speed of the turbine in the flow
stream 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.
●
●
Wide medium temperature range:
water: +5...+80 °C
air: -30...+140 °C
independent of temperature variations
Short reaction time
Mechanical sensing by means of turbine-type sensors is
Limitations:
1
recommended:
● where temperatures may be above the temperature range of the
● not suitable for media with solid particles
● can be overloaded only to a limited extent
● measuring signals depend on the viscosity of the medium
●
●
●
●
calorimetric heads (>130 °C),
where the media may change,
where the properties (thermal conductivity) of the medium may
vary significantly,
for media with air bubbles,
where an immediate response to flow rate changes is required.
● shock-sensitive
Monitoring head with turbine-type sensor
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
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.
pipe
turbine
error
(at 10 m/s)
Streamline sensors are largely insensitive to
oblique streaming (symmetrical to 0 ° line)
fitting
connector
(to electronic control unit)
± 1.5 % system
+10 % tolerance band
0
-10 %
-20 %
+25 °
-25 °
streamline sensor
+40 °
+30 °
+20 °
+10 °
0
-10 °
-20 °
-30 °
-40 °
oblique streaming
1 - 66
www.e-t-a.com
06/07 (230207)
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