DELTAFLOW -
averaging pitot tube for flow metering of steam, gas and liquids
A number of patents and several decades of continious product development
make the deltaflow to a leading flow meter in process industries. The result
is a flow which is optimized on measurement
accuracy and excellent process stability with a minimized pressure loss. Our
robust and reliable devices are even suitable for diry gases duch as humid
biogas, oily compressed air or hightemperature and highpressure steam. The
prinziple of operation, the
Pitot
Principle is well known and documented in the ISO 5167. Compared with
classical primary elem,ents such as orifice, venturi or nozzle, the
deltaflow has a number of advantage:
-
Minimal pressure loss. In particular for steam or compressed air
applicatiopns, might might save several kW
- simple installation
- light weight and easy to handle, even on big tubes
- highest measurement accuracy (up to 0,4%)
- not sensitive to dirt or condensates, flow metering in oily compressed
air, humid bio gas or dirty stack gas is possible.
- low
acquisition cost
-
proven calculation basics that use the same formulas as primary elements (orifice,
venturi, nozzle), so binding the deltaflow in a DCS works without any trouble
deltaflow flow meter is an ecologic wonder:
The systec Controls deltaflow flow meters are in use for more than ten thousand times.
Some application possibilities is the measurement of amounts of steam,
biogas flow measurement or measuring any other gas.
By thinking about the deltaflow in use with steam can save serveral kW of
Energy compared with an aperture, you may notice very fast that you don't
save money only, you also protect our enviroment.
A number of patents and several decades of continious product development make the deltaflow to a leading flow meter in process industries. The result is a flow which is optimized on measurement accuracy and excellent process stability with a minimized pressure loss. Our robust and reliable devices are even suitable for diry gases duch as humid biogas, oily compressed air or hightemperature and highpressure steam. The prinziple of operation, the Pitot Principle is well known and documented in the ISO 5167. Compared with classical primary elem,ents such as orifice, venturi or nozzle, the deltaflow has a number of advantage:
- Minimal pressure loss. In particular for steam or compressed air applicatiopns, might might save several kW
- simple installation
- light weight and easy to handle, even on big tubes
- highest measurement accuracy (up to 0,4%)
- not sensitive to dirt or condensates, flow metering in oily compressed air, humid bio gas or dirty stack gas is possible.
- low acquisition cost
- proven calculation basics that use the same formulas as primary elements (orifice, venturi, nozzle), so binding the deltaflow in a DCS works without any trouble
deltaflow flow meter is an ecologic wonder:
The systec Controls deltaflow flow meters are in use for more than ten thousand times. Some application possibilities is the measurement of amounts of steam, biogas flow measurement or measuring any other gas.
By thinking about the deltaflow in use with steam can save serveral kW of Energy compared with an aperture, you may notice very fast that you don't save money only, you also protect our enviroment.
deltaflow_brochure_en.pdf [1.83 MB]
deltaflow product information
deltaflow_installation_guide_english_revision122012_1.pdf [1.17 MB]
deltaflow installation guide
deltaflow_ptb-report_e.pdf [1.17 MB]
deltaflow ptb report
Precision and Process Viability of the deltaflow Integrating Pitot Tube
Approximately 30% of all flow measurements in plant installations are
based on the principle of differential pressure. In
spite of the high level of pressure loss and the
energy waste associated with it, as well as the installation difficulties in
comparison to dynamic pressure probes, most
measurements in this area are still made using
orifices.
Constant pressure lost by dynamic pressure probes is significantly less than
that lost by apertures; nevertheless, these
differential pressure monitors are still rather rare in
current installations. Rising energy costs, increasingly stringent
environmental codes, and the steadily increasing
pressure of competition all force modern industry
into a process of continually increasing operational efficiency. Today, new
coalfueled power stations reach an efficiency rate of
up to 46%; many gas-fueled power plants report an
efficiency rate of over 58%. Flow sensor technology often
lags behind this development.
In the past, poor levels of precision and insufficient process viability
have generally limited the application of dynamic
pressure probes to “non-critical” metering sites
which required less exact measurement. Insufficient documentation and the
lack of reliable calibration data and up-to-date
project management aids made it even more impractical
to successfully install dynamic pressure probes.
Since its founding, systec Controls GmbH of Puchheim (Germany) has invested
an enormous amount of resources in the effort to
address these difficulties. They have performed their
own research, and they have enlisted independent third parties in
the effort. Naturally, this effort includes developing solid and
well-established technical material, user-friendly
documentation, and state-of-the-art project
management aids.
Measurement Principles of the deltaflow Dynamic Pressure Probe
The deltaflow series of dynamic pressure probes represents the result of
all of this work. The deltaflow’s high level of
precision and excellent process viability—even in
extreme conditions—proves that it is superior to orifices.
Similar to the Prandtl measurement tube, the deltaflow measures flow
according to the differential pressure principle. In
the dual chamber profile, differential pressure
tapings in the flow direction and counter the flow direction result in a
differential pressure between the two measurement
chambers, which provides a measurement for the flow
rate of the medium. Unlike the Prandtl measurement tube, the
median of the flow profile is not achieved by adjusting the
measurement head and the resulting average
calculation. It is achieved by the advantageous positioning of
multiple differential pressure tapings across the cross-section of
the pipe. The following formula calculates the
resulting differential pressure:
dp=u²*0.5* ζ*ρ
ζ is the probe-specific resistance coefficient which is normally determined
experimentally. ρ is the density of the medium, dp is the
differential pressure, and u represents the median
flow rate. The influence of the process conditions ζ=ƒ(Re)
on this resistance coefficient describes the error of the dynamic
pressure probe.
The deltafliw integrating pitot tube was found, to have the smallest possible error on the resistance coefficient possible.