Proline Prowirl 72F, 72W, 73F, 73W
4 Endress+Hauser
The capacitive sensor
The sensor of a vortex flowmeter has a major influence on the ability, robustness and reliability of the whole
measuring system.
The robust DSC sensor - with an integrated temperature sensor (Pt 1000) with Prowirl 73 - is burst-tested and
vibration and temperature-shock-tested (temperature shocks of 150 K/s).
The Prowirl uses the tried-and-tested capacitive measuring technology of Endress+Hauser applied in over
100,000 vortex measuring points worldwide.
The DSC sensor (Differential Switched Capacitance) patented by Endress+Hauser has complete mechanical
balancing. It only reacts to the measured variable (vortex), not to vibrations. Even in the event of pipe
vibrations, the smallest of flows can be reliably measured at low density thanks to the unimpaired sensitivity of
the sensor.
Thus, the wide turndown is also maintained even in the event of harsh operating conditions. Vibrations up to
1 g, in frequencies up to 500 Hz in every axis (X, Y, Z), do not affect the flow measurement.
Thanks to its design, the capacitive sensor is also particularly mechanically resistant to temperature shocks and
water hammer in steam lines.
Temperature measurement (Prowirl 73)
In addition to the volume flow, the measuring device also measures the fluid temperature.
The temperature is measured by means of a Pt 1000 temperature sensor which is located in the paddle of the
DSC sensor, i.e. directly in the fluid (Fig. Pt 1000).
Flow computer (Prowirl 73)
The electronics of the measuring device have an integral flow computer. With the aid of this flow computer
other process variables can be calculated from the primary measured variables (volume flow and temperature),
e.g.:
• The mass flow and heat flow of saturated steam and water in accordance with IAPWS-IF97/ASME
• The mass flow and heat flow of superheated steam (at constant pressure or pressure read in via HART/
PROFIBUS PA/FOUNDATION Fieldbus) in accordance with IAPWS-IF97/ASME
• The mass flow and corrected volume flow of other gases (at a constant pressure or pressure read in via
HART/PROFIBUS PA/FOUNDATION Fieldbus, e.g. compressed air or optional natural gas AGA NX-19)
• The mass flow of any liquid (linear equation)
• Delta heat between saturated steam and condensate (second temperature read in via HART) in accordance
with IAPWS-IF97/ASME
• Delta heat between warm water and cold water (second temperature read in via HART) in accordance with
IAPWS-IF97/ASME
• In saturated steam measurements, the pressure of the steam can also be calculated from the measured
temperature and output in accordance with IAPWS-IF97/ASME
Diagnostic options (Prowirl 73)
Extensive diagnostic options, such as retracing fluid and ambient temperatures, extreme flows etc., are also
optionally available for the measuring device.
A0003940-EN
DSC sensor, Prowirl 72
A0004056-EN
DSC sensor, Prowirl 73 with integrated thermometer
(Pt 1000)
Sensor
Seal
Y-Axis
X-Axis
Z-Axis
Sensor
Y-Axis
X-Axis
Z-Axis
Pt 1000
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