Field Intelligent Device Series
Sanitary Electromagnetic Flowmeter
Sanitary electromagnetic flowmeters LF490 series are
designed for applications handling food and beverages.
Sanitary flowmeters must be structured in such a way
that operation and handling is simple, easy and
thorough for the purpose of sanitary control such as
cleaning (CIP/SIP), sterilization and drying. The
sanitary flowmeter has features provided with normal
electromagnetic flowmeters and by using sanitary
fittings for pipeline connections fluid does not remain
in any place along the detector pipeline. Therefore, it is
fit for flowrate measurement for food and beverages.
The electromagnetic flowmeter uses Faraday's Law of
electromagnetic induction to measure the process flow.
The device consists of two units: a detector, through
which the fluid to be measured flows and in which
low-level signals proportional to flow rates are
obtained; and a converter, which supplies excitation
current to the detector, and amplifies the signals from
the detector and then processes and converts the
signals into the 4–20mAdc current signal or
communication signal. With the unique patented
Mount-Anywhere magnetic field distribution
technology, the meter is highly immune to upstream
flow disturbances. Combined with a multi-functional
converter LF610 (combined type) or LF612 (separate
type) equipped with its patented Noise-Sentry original
noise-suppression circuit and advanced algorithms.
The LF490 has a very high tolerance to noise, giving
the unit a very stable output even for slurry fluid
measurement. IR (Infrared) switches enable parameter
setting of the converter without removing the cover.
Flow direction can be set in either way, and its unique
128 x 128 dot matrix LCD display allows the LCD to
be rotated electronically to 90, 180 and 270 degrees
without opening the cover.
Figure2. LF490 series flowmeters
The AF900 hand-held terminal (HART*
communicator) can be used to communicate with the
flowmeter from a remote place. PROFIBUS-PA*
interface is available as an option.
*1: HART protocol (Highway Addressable Remote
Transducer) is a communication protocol for industrial
sensors recommended by the HCF (HART
*2: PROFIBUS is the communication protocol for factory
and process automation that the PROFIBUS
Organization recommends. Instead of analog control
with a conventional analog signal (4-20mA), it is the
fieldbus which digitizes all signals. Flowmeters support
1S to 4S (25 to 100 mm)