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 ± 8
µ
A (0.05% of span).
* Refer to individual calibration data for each
individual meter’s measurement error.
LF232
Field Intelligent Device Series
Electromagnetic Flowmeter Converter
