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TIC-LF232A
Field Intelligent Device Series
Sanitary Electromagnetic Flowmeter
Introduction
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 4–20 mA dc current signal.
The LF232 offers various outputs such as totalization
output and multi-range selection outputs. With it
patented Noise-Sentry original noise-suppression
circuit and advanced algorithms. The LF232 is highly
resistant to noise and provides a stable output even
when measuring fluids contain slurries. The
LF232 can
be used with a separately mounted detector such as the
LF150 or LF470. The LF232 can also be used with
conventional models of detectors.
The AF900 hand-held terminal (HART*
1
communicator) can be used to communicate with the
flowmeter from a remote place. See the
Communications signal specification for details about
HART protocol.
*1: HART protocol (Highway Addressable Remote
Transducer) is a communication protocol for industrial
sensors recommended by the HCF
(HART
Communication Foundation).
Specifications
Overall Specifications
Measurement range in terms of flow velocity:
Conbination LF150, LF470
0 –1.0 ft/s to 0 – 32.8 ft/s (0 – 0.3 m/s to 0 –10 m/s)
Fluid conductivity: 5µS/cm or more
Ambient temperature: -4 to 140 °F (-20 to 60 °C)
(Storage temperature: -13 to 149 °F (-25 to 65 °C))
Structure: IP67 and NEMA 4X Watertight
Figure 1. LF232 Converter
Accuracy: the accuracy is dependent on the type of
detector combined with the LF232. See the following
tables for accuracy when combined with specified
detectors.
・Detector combined
LF470 (Meter size 1/10", 1/6”, 1/4"
(2.5 to 6 mm))
Accuracy Flow rate as a
percent of range
0.3–1.0m/s 1.0–10m/s
0～50％ ±0.8％FS
±0.4％FS
50～100％ ±0.8％FS ±0.8％ of rate
・Detector combined
LF150 (Meter size 28” to 120” (700 to 3000 mm))
Accuracy: ±0.5 % of Rate*
* This pulse output error result is established under
standard operating conditions at Toshiba’s flow
calibration facility, Fuchu Japan.
* Individual meter’s measurement error may vary up
to ± 0.8 % of Rate at 3.28 ft/s (1.0 m/s) or more and
± 0.4% of Rate ±0.157 inch/s (4mm/s) at 3.28 ft/s
(1.0 m/s) or less.
* Current output: plus ± 8µA (0.05% of span).
* Refer to individual calibration data for each
individual meter’s measurement error.
LF232
Field Intelligent Device Series
Electromagnetic Flowmeter Converter