Toshiba LF434 /LF620 Manual

Field Intelligent Device – Mount Anywhere Series - Flanged
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 mAdc 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 LF620
(combined type) or LF622 (separate type) equipped
with its patented Noise-Sentry original noise-
suppression circuit and advanced algorithms. The
LF430 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. The terminal block in LCD side
make easy to wire in case of the combined type.
* HART protocol (Highway Addressable Remote Transducer) is a
communication protocol for industrial sensors recommended
by the HCF (HART Communication Foundation).
** DevComm2000 Smart Device Communicator available
through TIC for performing HART device configurations on
PC or laptop.
* PROFIBUS is the communications protocol for factory and
process automation that the PROFIBUS Organization
recommends. Instead of analog control with a conventional
analog signal (4-20 mA), it is fieldbus which digitizes all
signals. Flowmeters support PROFIBUS-PA.
* Modbus is the communication protocol that Modicon Inc.
developed. Physical layer is RS485.
Combined type
Figure1. Configuration
Separate type
1/2" to 24" (15 to 600 mm)
LF430/LF620
LF434/LF620F
Figure2. LF430 Mount-Anywhere series
Flowmeters
Specifications
Overall Specifications
Measurement range in terms of flow velocity:
0 –1.0 ft/s to 0 – 32.8 ft/s (0 – 0.3 m/s to 0 –10 m/s)
0 – 0.3 ft/s to 0 – 1.0 ft/s (0 – 0.1 m/s to 0 – 0.3 m/s)
range is available as an option.
Accuracy:
< 1/2" to 18" ( 15mm to 450mm )>
±0.2 % of Rate
*
* This pulse output error result is established under standard
operating conditions at Toshiba's flow calibration facility,
Fuchu Japan. (NIST Traceable).
* Individual meter measurement error may vary up to ±0.5% of
Rate at 1.64 ft/s (0.5m/s) or more and ±0.3% of rate ±0.039
inch/s (1mm/s) at 1.64 ft/s or less.
* Current output: plus ± 8µA (0.05% of span.)
* Refer to individual calibration data for each individual
meter's measurement error.
< 20" and 24" ( 500mm and 600mm )>
±0.3 % of Rate
*
* This pulse output error result is established under standard
operating conditions at Toshiba's flow calibration facility,
Fuchu Japan.
* Individual meter measurement error may vary up to ±0.5% of
Rate at 3.28 ft/s (1.0m/s) or more and ±0.3% of rate ±0.079
inch/s (2mm/s) at 3.28 ft/s (1.0m/s) or less.
* Current output: plus ± 8µA (0.05% of span.)
* Refer to individual calibration data for each individual meter's
measurement error.
LF434 /LF620
LF434 /LF622
LF430 LF622
LF434 LF622F
Cert. No.
Cert. No. PM09896
Z01207
For Hard rubber
lined flowmeter
TIC-LF434H