Field Intelligent Device Series
Electromagnetic Flowmeter Converter
LF232
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. TheLF232 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.
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.
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).
・Detector combined
LF470 (Meter size 1/10", 1/6”, 1/4" (2.5 to 6 mm))
Flow rate as a
percent of range
0～50％
Accuracy
0.3–1.0m/s
1.0–10m/s
±0.8％FS
±0.4％FS
50～100％
±0.8％FS ±0.8％ of rate
Specifications
・Detector combined
ꢀOverall Specifications
LF150 (Meter size 28” to 120” (700 to 3000 mm))
Accuracy: ±0.5 % of Rate*
Measurement range in terms of flow velocity:
* 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.
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
TIC-LF232A
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Surge protection: Surge protectors are installed in the
power supply, excitation circuit, current signal
output and digital I/O circuit.
Communications signal:
A digital communications (HART protocol) signal is
superimposed on 4 to 20 mA dc analog output
signal.
Terminal block structure: 21-pole, screw connection
type (M4 screw)
Load resistance: 240 Ω to 1 kΩ
Load capacitance: 0.25 µF or less
Housing: Aluminum alloy
Load inductance: 4mH or less
Coating: Acrylic resin-baked coating, pearl-gray
colored
(For maximum cable length, about 2km is a
guideline length when CVV-S 1.25mm2 is used
under standard installation condition.)
Cable connection ports :
A cable gland is provided for each port.
OD of cable φ11 to 13 mm
Material Nylon 66
Note: HART(Highway Addressable Remote
Trans-ducer) is a communications protocol for
industrial sensors recommended by the HCF (HART
Commu-nication Foundation).
G (PF) 1/2 male screws.
Vibration resistance:
No resonance to the following levels of vibration:
• 10 to 55Hz with amplitude of 0.07mm
• Vibration of 30Hz with 29.4 m/s2 in 4h in each
direction will not cause any defect to unit.
Output display:
16-character×2-line dot-matrix LCD
(With back light).
2 units can be selected from the flowing units: flow
velocity, instantaneous flow rate, total flow
(forward/reverse/difference flow), total count, %,
custom unit.
Note: If the flowmeter is intended to be used in a
location where vibration is applied
constantly contact Toshiba.
Dimension and Weights:
Parameter settings—Parameters can be set as follows
•IR Switches: Various parameters can be set without
opening the converter housing using 4 infrared
switches (password can be set)
See Figure 2
•Zero adjustment: Zero point adjustment can be
started by pressing the switch in the converter.
•Digital communication: The AF 900 hand-held
terminal is needed to set parameters.
•Damping: 0.5 to 60 s (selectable in 1s increments)
“Field re-verification” Mag-Prover – Toshiba’s
Zero span calibration tool allows unit to be
re-calibrated and verified using internal software
program. (For more information contact Toshiba
International Corp.)
Conditions when power fails:
Parameter setting values are stored in non-volatile
memory and the values will be restored when the
power returns to normal condition. The output and
display will stay as follows when power fails.
Current output: 0 mA
Digital output: OFF (contact open)
LCD display : No display
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Installation
ꢀDimensions
9.33 (237)
Installation method
4-φ12 hole
･Installed by panel or pipe
8.74 (222)
2.91 (74)
6.10 (155)
･ Appointedboutandnutfor
installationisattached.
In the case of 2B pipe installation
M10 U bolts
2Bpipe
Signal cable ground
Output cable ground
Power supply cable ground
In the case of panel installation
11 to 12 φhole
2.91 (74)
4 places
Grounding terminal
2.99 (76)
I/O cable ground
2.99 (76)
2.99 (76)
Weight : Approximately18 lb (8 kg)
(including a mounting bracket)
Excitation cable ground
Figure 2. Separate type converter LF232
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ꢀExternal Connections
Terminal box
Power supply
(CVV)
Ⅳ wire
5.5mm2 or more
Power supply
Grounded with 100Ω or
less ground resistance
Current output (4 to 20mA)
Digital input 2 (opt.)
Thick walled steel conduit
Digital input 1 (opt.)
(20 to 30 Vdc)
Digital output 4 (opt.)
Digital output 3 (opt.)
Digital output 2 (opt.)
Detector
Signal cable
(2-wire shielded hard-rubber sheathed cable)
Digital output
Grounded with 100Ω or
less ground resistance
Excitation cable
(3-wire hard-rubber sheathed cable)
Output cable
(CVV-S)
Digital I/O cable
(CVV-S)
Figure 3. External Wiring Diagram
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ꢀWiring Precautions
ꢀAbout establishment environment
Do not store or install the flowmeter:
• Where there is direct sunlight.
• Where excessive vibration or mechanical shock
occurs.
(1)Be sure to use thick walled steel conduit (22mm)
for signal and excitation cable wiring between the
detector and converter. Use flexible conduit at the
cable outlets of the detector and converter.
(2) Connect the grounding wire (IV wire 5.5mm² or
more) to a good earth ground (100Ω or less ground
resistance). Make the wire as short as possible. Do
not use a common ground shared with other
equipment where earth current may flow. An
independent earth ground is recommended.
(3) The allowable cable lengths between the detector
and converter for the separate type flowmeter
depend on the electrical conductivity of the object
fluid. See Figure 4 below.
• Where high temperature or high humidity
conditions exist.
• Places where corrosive atmospheres exist.
• Places submerged under water.
• Place where there is sloped floor. To put the
flowmeter temporarily on the floor, place it
carefully with something, such as stopper, to
support it so that the flowmeter will not topple over.
In areas like the following, there may be the case that
infrared switches do not function correctly. (If these
are unavoidable, use an appropriate cover.)
(1) Where unit (operation panel) is exposed to direct
sunlight, reflection of light onto window pane and
diffused light reflection.
(4) Digital output 1, digital output 2 to 4 , digital output
1 to 2 are insulated mutually.
(2) Where smoke and steam may occur.
(3) Where exposed to direct snow, ice or mud.
300
200
100
ー
ル許容
50
30
20
Ordering Information
①
②
1. When ordering the LF232 converter, refer to
Tables 1 (Type Specification Code).
An entry must be made for each of the columns in
each of these tables.
10
5
3
2. Measuring range
3. I/O function specifications.
4. Ordering scope:
Actual flow calibration data: (required or not)
5. Specification of combined detector
6. Other scope:
3
5
10 20 30 50 100 200
Conductivity (µS/cm)
(1)When combined with LF150.
Specification other than standard items.
(2)When combined with LF470.
Figure 4. Electrical Conductivity and Cable length
Consult a Toshiba representative before ordering.
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Table 1. Specification Code for converters (LF232)
Model
Specification Code
Contents
1
L
2
3
2
4
5
2
6
7
8
9 10 11 12 13 14
F
3
Separate type converter
Purpose
Standard
A
Compatible detectors (Note1,2,3)
Medium to small-size detectors:
Meter size 1/10” to 18” (2.5 to 450 mm)
Large-size detectors:
A
B
Meter size 28” to 120” (700 to 3000 mm)
Mounting nuts and bolts
C
E
Panel, wall mounting (BNP material : SUS304)
Pipe mounting (BNP material : SUS304)
Digital input/output
1
3
Current output
+ Digital output points (1 point)
Current output
+ Digital output points (4 points) + Digital input points (2 points)
Communication function
HART communication
1
Power supply
100Vac-240Vac, 50/60Hz (Note 2)
24Vdc (Note 3)
1
2
A
Standard
Note 1: For applicable detector code, select one from the following table.
To combine with an existing detector, select one depending on the type of replaceable converters.
For combination with detectors not listed below, contact Toshiba.
Applicable
detector code
Applicable
detector
Applicable detector
(discontinued model)
Replaceable converters
334,
372, LF200, LF220, LF420,
A
B
LF470 type
LF150 type
335 type (Converters of LF230* A type
types shown right)
337,
373, 378, LF230* B type
335 type (Converters of
types shown right)
Note 2: When the 7th digit is “B” and power supply specification code is “1”, power supply specification is 100 to
120VAC.
Note 3: 24VDC can be specified only when the 7th digit is “A”.
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Specifications are subject to change without notice.
Printed in Japan 2008-5 (TDOC)
© TOSHIBA Corporation 2008
All Rights Reserved.
ISO9001 and ISO14001 are certified.
Misuse of this product can result in damages to property or human injury.
Read related manuals carefully before using this product.
TIC-LF232A
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