Dynasonics MFX Data sheet
Series MFX
HOT-TAPPED INSERTION MAGNETIC PROBE
Series MFX Insertion MagProbe™ Flow Meters feature the world’s
most advanced magnetic flow measurement technology. The Series
MFX is a cost-effective solution for accurate measurement of
conductive liquid in closed conduit, pressurized-pipes without
process shutdown. The "flat tip" design will reduce fouling in
applications where suspended solids are present.
The MFX reliably measures most conductive fluids including water,
sewage, wastewater, clarified water, RAS, WAS, primary sludge and
cooling tower water, as long as adequate lengths of straight pipe are
available where the sensor is installed.
The MFX system consists of a hot-tappable insertion-type sensor that
mounts through a 1-1/2” ball valve pipe-tap into the flowing liquid,
and a remote digital display enclosure. The digital display is utilized to
FEATURES
Absolute (bi-directional) measurements from 0.1 to 30 FPS
(0.03 to 9 MPS).
Integrated sensor pre-amplifier permits separation of up to 990 feet
(297 m) between the sensor probe and MFX electronic analyzer.
Optional, optically isolated, field replaceable input/output modules
include: 4-20mA, dual-relay, rate pulse, RS232 and RS485.
Hot-tap sensor can be installed and retracted from process piping
without draining or depressurizing the system.
program engineering units, view flow rate/totalizer values and provide
process outputs. Velocity and pipe diameter information are entered by
the user via the display keypad or UltraLink™ software and used to
calculate volumetric flow, over wide flow ranges, with a high degree
of accuracy.
The Series MFX is more versatile and convenient than most
conventional full-pipe magnetic meters. MFX meters can be universally applied to a large range of pipe sizes without hardware changes,
compared to the specific internal pipe dimension design of conventional magnetic meters. In addition, cost differences are minimal when
moving to larger pipe sizes.
MagProbe sensors are available in
limited access mounting configura
diameters 4 to 120 inches (102 to 3048 mm).
High impedance input circuits minimize the influence of
electrode coating.
Industrial-grade sensor design: NEMA 6 (IP 67) submersible,
temperature to +225 °F (+105 °C), pressure to 700 PSIG (48 bar), titanium,
316SS, Viton
UltraLink PC utility permits configuration and intelligent diagnostics
to be performed.
®
and PVDF wetted materials.
various lengths to accommodate
tions and installation in pipe internal
DIVISION OF RACINE FEDERATED INC.
www.dynasonics.com800.535.3569
TM
PRINCIPLES OF OPERATION
Series MFX Series MFX Series MFX
™
The MagProbe
used for measuring electrically conductive liquids, such
as water and water-based fluids, in closed piping
systems. The unit operates utilizing Faraday’s principle
of magnetic conduction, whereby a moving conductor
(the liquid) has a voltage imposed on it that is directly
proportional to two variables – the strength of a local
magnetic field and the velocity of the moving conductor.
Imposed voltage α Magnetic field × Fluid velocity
If the strength of the magnetic field is held constant,
then the magnitude of the voltage will be proportional to
the velocity of the moving conductor. The equation then
simplifies to Imposed voltage α Fluid velocity. The
MFX applies tri-stated, alternating polarity DC pulses to
an integral electromagnet (See Figure 1). Voltage
measurements are made with the magnet off, to
measure ambient background noise, and then with the
magnet on in both polarities. The magnitude difference
in voltage measured is proportional to flow. Once fluid
velocity is measured, then various volumetric flow
measurements will be obtained if the pipe internal
diameter (I.D.) is known.
Point-velocity flow meters measure the fluid velocity at a
specified depth into the fluid stream, typically 1/8 of the
pipe I.D., which has been proven to be the nominal
velocity point when symmetrical flow profiles are
present. This assumption requires the probe to be
downstream of any piping condition (elbows, valves,
thermo-wells, tees, etc.) that can cause flow
Typically, a minimum of 15 pipe diameters of straight
pipe is required to develop a symmetrical flow profile.
is a point-velocity measuring device
abnormalities.
The MFX is the perfect alternative to clamp-on and inline style
flow meters where pipe construction and site accessibility may
present an installation problem. Dynasonics’ “hot-tap” design
makes installation of the MagProbe sensor possible without
having to plumb in or drain a line.
A typical application would find the MagProbe installed on a pipe
inside a vault or manhole (See Figure 3), measuring the flow of
water or wastewater. The NEMA 4X enclosure rating of the MFX
transmitter gives the added flexibility of indoor or outdoor usage.
The MFX is best suited for measuring clean liquids on large
pipes with large amounts of straight run.
Figure 3 – Typical MagProbe Water Application
Figure 1 – Magnet Excitation
Magnet On
+ Polarity
Magnet
Off
Figure 2 – MagProbe Design
1/8 of Pipe
Diameter
Magnet
Off
Magnet
Off
Magnet On
- Polarity
Pipe Wall
Pulsed
Magnetic
Field
Electrodes
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