Chemical Technology

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FOCUS ON CONTROL &AUTOMATION
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Chemical Technology • November 2015
GEMÜ 3030 mFlow: Compact. Flexible. Cost effective.
Compact and flexible components, avail-
able at low cost, are in high demand in
the plant engineering sector. Thanks to
its varied applications, the GEMÜ 3030
mFlow is amore cost-effective option than
conventional flowmeters.
Using magnetic induction as a measure-
ment principle, a moving conductor induces
a voltage in a magnetic field which is pro-
portional to the speed of the medium. The
flowing medium, which must be electrically
conductive, (≥ 20 µS/cm) is the moving con-
ductor. This makes it possible to measure
the flow velocity of liquids precisely. The
flow rate is then calculated using the pipe
cross-section previously entered by the user.
Flow velocities of 0,1-10m/s are measured.
Furthermore, the measurement result
is largely independent of process pressure,
temperature and viscosity.
The GEMÜ 3030mFlow operates reliably
with conducting media in the temperature
range of 0-135 °C with a supply voltage of
24 VDC and an automatic adaptation of the
measuring range (0-4 m/s or 0-10 m/s).
The ambient temperature should not
exceed 60 °C or fall below 0 °C.
Themagnetically inductive flowmeter can
be used up to a maximum operating pres-
sure of 10 bar. Thanks to the low installation
depth of the sensor, there is only a negligible
loss in pressure.
Simple connection to the plant control
system
The system is connected electrically using
standard connectors which are fitted to the
back of the flowmeter as 5-pin M12 connec-
tors, making it easier to connect electrically
without needing to open the housing.
The GEMÜ 3030 mFlow can be optimally
integrated in fully automatic plant control
systems using standard signals (analogue
output 4-20 mA and pulse output 24 VDC)
to transmit the flow rate to higher-level plant
systems and interfaces such as the RS232
and Profibus DP.
Status information, error messages
and the operating range can be displayed
and operated simply and easily thanks to
these interfaces. The two visual indica-
tors, integrated in the housing, indicate
the status of the Profibus connection. This
makes it possible to detect visually, quickly
and easily, any connection problems in the
fieldbus system or faulty data transmission
of a device.
Variable application
The accompanying weld-in sleeve for the
GEMÜ 3030mFlow enables it to be installed
in a variety of piping. Nominal sizes fromDN
25-DN 300 can be covered with this one
device. A bolt hole is simply drilled into the
piping so that the weld-in sleeve, the adapta-
tion device for the GEMÜ 3030 mFlow, can
then be welded in place.
Apart from the weld-in sleeve, in-line
housings and wafer-type flanges can be
used as fittings. If required, a deadleg-free
measurement or a measurement with full
flow bore can be achieved. In-line housings
by Neumo and Tuchenhagen are suitable
for this purpose. These requirements are
particularly important in the pharmaceu-
tical and foodstuff industry, but also in
the mining industry where pipes without
constrictions are advantageous because
of abrasion and deposits.
Fast and uncomplicated commissioning
In addition to the uncomplicated and fast
installation of the GEMÜ 3030 mFlow,
commissioning is simple, with versatile
operating facilities, for example using the
fascia buttons with illuminated display,
PC connection with Internet browser and
fieldbus interfaces. No special software is
required for browser operation, as this is al-
ready integrated in the GEMÜ 3030 mFlow.
All that is needed is a standard browser and
a current operating system.
Two levels are available for operating the
device using the front keyboard. After the
supply voltage is switched on, the GEMÜ
3030 mFlow is at the working level, where
the most important system parameters are
displayed. It is also possible to adjust the
individual display settings. As standard, the
current flow rate and the flow velocity are
displayed in one metric unit. The user can
set and adapt different parameters during
operation using the configuration level.
Application in many sectors
The GEMÜ 3030mFlow is suitable for a wide
range of uses in the most varied of indus-
trial sectors. In most cases, this entails the
measurement of all types of liquid media.
Thanks to its contactless measurement
principle, the flowmeter can also measure
media with particles; this means it can be
used to measure fruit juices, for example.
In addition to the beverage industry, the
GEMÜ 3030 mFlow can also be used in the
mining industry, which very often involves
work with slurry.
A huge variety of advantages
The GEMÜ 3030 mFlow has extensive
diagnostic facilities, enabling errors to be
detected and rectified as soon as possible.
While conventional sensor and display units
only report simple switch signals, the GEMÜ
3030 mFlow can save all these errors, im-
mediately displaying the current problemus-
ing a distinctive error code. The saved error
list can then be downloaded to a computer
using the implemented RS232 interface.
Settings can be made using this con-
nection which are then saved as parameter
files, which can, in turn, be loaded onto
other devices as required. This enables fast
and uncomplicated parameterisation when
using more than one device.
Furthermore, adjustable relay functions
can be used which can report additional
information, for example when a flow rate
value is exceeded or undershot. Bi-direc-
tional measurement permits installation
independent of the flow direction. However,
we recommend installation in the flow direc-
tion indicated on the devices. Due to the
measurement principle, there are nomoving
parts in the medium.
For more information contact Claudio
Darpin on tel: +27 11 462 7795 or email
.