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ChannelMag
Section 1 Introduction
The ChannelMag CM2 is suitable for open channels having diverse cross sectional shapes from 6” to
200 feet (150 mm to 60 m). They meet or exceed the requirements of ISO 9213 and are calibrated in a
long open tank, believed to be the largest NIST traceable facility available. The ChannelMags are
calibrated in accordance with ISO* approved methods. Each ChannelMag system is normally supplied
with a NIST traceable Calibration Certificate.
Magnetic enhancement plates are fixed to and calibrated with ChannelMag sensor types CM2/8” –
40”. The enhancement plates are purposely made to the required shape of the channel, to widths or
diameters from 10” to 15 feet (250 mm to 3 m). Their purpose is to determine the distribution pattern
of magnetic flux on calibration in ARKON test laboratory and to insure it is the same as the
distribution on-site. In this way, the test calibration is the same as on-site. For channels less than 10”
(250 mm) or wider than 15 feet (4500 mm), or when used with ChannelMag type CM2/D, the
effectiveness of the enhancement plates is minimal, so they are not normally supplied.
ChannelMag CM2 sensors generate a powerful magnetic field over the whole or significant area of the
channel. They operate using Faraday’s Law, where a conductor moving in a magnetic field induces a
voltage, the amplitude of which is proportional to the velocity of the conductor. The conductor is the
media being measured. Large conical electrodes on the CM2 sensor measure the voltage signal, which
is the mean velocity of the complete cross sectional flow and is unaffected by media viscosity or
density.
Volumetric flow is computed in the 4411e by multiplying level x mean velocity. The level signal from
a diverse range of cross sectional shapes can be linearized in the 4411e. Level is measured normally
by a high resolution ultrasonic level transducer. If the level sensor needs to be hidden from view, or if
there is substantial froth on the media surface, then a high resolution pressure transducer is used under
the ramps of the CM2 sensor.
1.1 Scope:
ChannelMag CM2