Toshiba LF470 Automobile Parts User Manual

TOSHIBA
ELECTROMAGNETIC FLOWMETER DETECTOR
Я mr erre rre darme rr
MODEL LF470
INSTRUCTION MANUAL
TOSHIBA CORPORATION
TOSHIBA 6F8A0802
NOTICE
This Manual is designed to assist in installing, operating, and maintaining the LF470
separate type electromagnetic flowmeter. For safety reasons, and to obtain the optimum
performance from the flowmeter, read this Manual thoroughly before working with the
product. Keep the Manual within easy reach for reference whenever needed.
The flowmeter to which this Manual refers is NOT designed for applications in which
the functioning of this product is critical to human safety, such as:
e Main control systems of nuclear power plants; safety systems in nuclear facilities
or other critical control lines directly affecting human safety.
e Control systems of medical equipment, including life support machines.
NOTES
1. The reproduction of the contents of this Manual in any form, whether wholly or in part, is
not permitted without explicit prior consent and approval.
2. The information contained in this Manual is subject to change or review without prior
notice.
3. Be sure to follow all safety, operating and handling precautions described in this Manual
and the regulations in force in the country in which this product is to be used.
Fifth Edition
January. 2001
© Copyright 2001 by Toshiba Corporation. All rights reserved.
TOSHIBA 6F8A0802
SAFETY PRECAUTIONS
Safety signs and labels affixed to the product and/or described in this manual give important
information for using the product safely. They help prevent damage to property and obviate
hazards for persons using the product.
Make yourself familiar with signal words and symbols used for safety signs and labels. Then
read the safety precautions that follow to prevent an accident involving personal injury,
death or damage to property.
Explanation of signal words
The signal word or words are used to designate a degree or level of hazard seriousness.
The signal words used for the product described in this manual are WARNING and
CAUTION.
Indicates a potentially hazardous situation
A WARNIN G which, if not avoided, could result in death or
Serious injury.
Indicates a potentially hazardous situation
A С AU TIO N which, if not avoided, may result in minor to
moderate injuries or in property damage.
Safety symbols
The following symbols are used in safety signs and labels affixed to a product and/or in the
manual for giving safety instructions.
Indicates an action that is prohibited. Simply DON’T do this action.
The prohibited action is indicated by a picture or text inside or next to
the circle
Indicates an action that is mandatory. DO this action.
The mandatory action is indicated by a picture or text inside or next to
the circle.
Indicates a potential hazard. The potentially hazardous situation 1s
indicated by a picture or text inside or next to the triangle.
> @ ©
TOSHIBA
6F8A08072
SAFETY PRECAUTIONS (continued)
Safety Precautions for Installation and Wiring
/\ WARNING
HB Do not use the LF470 in an explosive atmosphere.
Using this product in an explosive atmosphere
O
DON’T
can cause explosion.
/N CAUTION
EH Turn off mains power before
working on pipes.
Working on pipes while
power is applied can
cause electric shock.
DO
EH Use an appropriate device to carry and
install the LF470.
H this product falls to the
ground, injury, or
malfunction of or damage to
DO the product, can be caused.
E Install a switch and fuse to isolate
the LF470 from mains power.
Power supply from mains
power can cause electric
shock or circuit
DO break-down.
E Do not modify or disassemble the
LF470 unnecessarily.
Modifying or disassembling
this product can cause
electric shock,
malfunction of or damage
to this product.
©
DON’T
BM Turn off mains power before
conducting wiring work.
Wiring while power is
applied can cause
electric shock.
DO
E Ground the LF470 independently
from power equipment.
Operating this product
without grounding can cause
electric shock or
DO malfunction.
EM Do not conduct wiring work with bare
hands.
O
DON’T
Remaining electric
charge even if power is
turned off can still cause
electric shock.
EH Use crimped terminal lugs for the
terminal board and GND terminal.
Loose connections can
cause electric shock, fire
from excessive current or
system malfunction.
E Do not work on piping and wiring
with wet hands.
O
DON’T
Wet hands may result in
electric shock.
The label shown left is
placed near the terminal
board for power input.
(A black border and symbol
on yellow triangle)
Be alert to electric shock.
>
TOSHIBA 6F8A0802
SAFETY PRECAUTIONS (continued)
Safety Precautions for Maintenance and Inspection
/\ CAUTION
№ Do not touch the LF470 main body
when high temperature fluid is be-
ing measured.
| The fluid raises the main
body temperature and can
cause burns when
DON’T
touched.
MW Do not conduct wiring work when
power is applied.
O
DON’T
Wiring while power is
applied can cause
electric shock.
№ Do not conduct wiring work with wet
hands.
O
DON’T
Wet hands may result in
electric shock.
The label shown left is
placed near the
terminal board for
power input.
(A black border and
symbol on yellow
triangle)
Be alert to electric
shock.
AN
E Do not use a fuse other than the one
specified.
O
Using a fuse other than the
one specified can cause
system failure, damage
Use a rated fuse as follows:
Fuse rating:
* 1A/250V for 100 to 240Vac or
110Vdc
« 2A/250V for 24 Vdc
Dimensions:
or malfunction. Diameter 5.2 mm x 20 mm
DON T Melting time characteristic:
Normal blow
Disclaimer
Toshiba does not accept liability for any damage or loss, material or personal, caused as a
direct or indirect result of the operation of this product in connection with, or due to, the
occurrence of any event of force majeure (including fire or earthquake) or the misuse of this
product, whether intentional or accidental. |
TOSHIBA 6F8A0807
Handling Precautions
H To obtain the optimum performance from the LF470 flowmeter for years of continuous
operation, observe the following precautions.
(1) Do not store or install the flowmeter in:
* places where there is direct sunlight. If this is unavoidable, use an appropriate
sunshade.
—* places where excessive vibration or mechanical shock occurs.
* places where high temperature or high humidity conditions obtain.
* places where corrosive atmospheres obtain.
* places submerged under water. |
To put the flowmeter temporarily on the floor, place it carefully with something to
support it so that the flowmeter will not topple over.
(2) Execute wiring securely and correctly.
Ground the flowmeter with 100 ohm or less ground resistance. Avoid a common
ground used with other equipment where earth current may flow. An independent
ground is preferable
(3) Seal the cable thoroughly at the cable gland of the converter so that the cable is
kept airtight.
(4) The converter housing covers and the cable glands are tightened securely at the
time of shipment. Do not remove these covers or glands. Otherwise, gradual dete-
rioration of circuit isolation or damage to this product can be caused. Tighten the
covers or cable glands securely again if they have been removed.
(5) Make sure the fluid to be measured will not freeze in the detector pipe. This can
cause damage to the detector pipe.
(6) Select appropriate wetted materials suited for the process fluid to be measured.
Otherwise, fluid leakage due to corrosion can be caused.
TOSHIBA 6F8A0802
Handling Precautions (continued)
(7) Observe the following precautions when you open the converter housing cover:
* Do not open the cover in the open air unprotected against rain or wind. This
can cause electric shock or cause damage to the flowmeter electronics.
Do not open the cover under high ambient temperature or high humidity
conditions or in corrosive atmospheres. This can cause deterioration of
system accuracy or cause damage to the flowmeter electronics.
(8) This product may cause interference to radio and television sets if they are
used near the installation site. Use metal conduits etc. for cables to prevent
this interference.
(9) Radio transmitters such as transceivers or cellular phones may cause interference
to the flowmeter if they are used near the installation site. Observe the following
precautions when using them:
* Do not use a transceiver whose output power is more than 5 W.
* Move the antenna of a transceiver or a cellular phone at least 50 cm away from
the flowmeter and signal cables when using it. Do not use a radio transmitter
or a cellular phone near the flowmeter while it is operating online. The
transmitter or cellular phone’s output impulse noise may interfere with the
flowmeter.
* Do not install a radio transmitter antenna near the flowmeter and signal cables.
(10) For reasons of flowmeter failure, inappropriate parameters, unsuitable cable
connections or poor installation conditions, the flowmeter may not operate
properly. To prevent any of these problems causing a system failure, 1t is
recommended that you have preventive measures designed and installed on
the flowmeter signal receiving side.
TOSHIBA 6F8A0802
Table of Contents
SAFETY PREC AUTIONS OT 2
Handling Precautions Phere ase ais eaa teaser eae a sassy sass en §
1. Product Inspection and Storage cheer esas 63 844 8 300600080008 8060350 8
1.1 Product Inspection Sac e tress ost sors as rete ssa arose N
1.2 Storage eu 56 au 3643 00 48 5 50 5400 4 0 0 0 8 80 48 8 584 08 0 0 064 5 044 05005 8
2. Overview a scerorocarodrerertr orar ereorrvererrerarerrorersrocacoer Y
3. Names of Parts a 3 3 5 4 5 8% 4 3 » > 4 5 5 à 0 23 3 à à x 5 4 6 % D € 4 3 » # G % Boe oA оз ввоз сво 10
4. Installation *nvosersroroecsicoroeronmaecar e serrerrró rovaroazaracvarcenoe Y]
4.1 Location o. + 8 B Boe w Mo B+ & EB + oa x à + € % # + 4 5 n + « u » #9 1 $ + à Hs + 4 x $ + 6 5% # + 4 12
4.2 Mounting Procedure * °°° 11881000 13
4.3 Piping Connections “ct rc rrr errr ears aia 14
5, Wiring ser 006046602006 4 50050000 502 058088000598 00 084505040500 18
5.1 Cables A 4 u 2 6 x x #2 & vu » + xk BoB So > » + + = » + = 19
5.2 External Device Connections and Grounding ‘°° reee 20
5.3 Wiring Procedure "cc cc rr irritation sae sao 22
6. Operation sen vo 4 60 #24 0853886 808800080888 0 50293 6088800604 45000 A
6.1 Preparatory СЪесК ‘о болллллллелллвнннобовб нон б я ннннно о 25
7. Maintenance and Troubleshooting ccc 26
7.1 Maintenance 2% 4 = à 84 5 5 +48 846085 53085008 880485460500 485 4405 540055 26
7.2 Troubleshooting ******* ado Enneccrorarororecarararorarere TO
—8, Principle of Operation pau 86 4 4 8 8554844 4 46 4 8 8 05 80 6H 400605 4 604 4 85 4850000 31
9. Specifications 664 046054808486 8 6 80846063 4 080 V6 404 0849805000 «> 32
9.1 Flowmeter Specifications > 6 3 8 à 3 2» + 4 % + 4 8 D 4 6€ ® 5 + 3 5 vb + @ R 8 0 a x » 6 4 5 5 32
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9.2 Type Specification Code +.”
10. Outline Dimensions a » e # 5 6 4 # # 4 4 4 » be $ 5 à 4 5 # 6 € u # + 6 % à 6 4 ur _eam er e EEE e 3 5
TOSHIBA 6F3A0802
1. Product Inspection and Storage
Upon arrival of the product package, open the package and check the items contained inside.
If you do not intend to install the product soon after opening the package, store the product
and other related items in a place such as described in 1.2 below.
1.1 Product Inspection
The LF470 electromagnetic flowmeter is shipped in a cardboard container filled with
shock-absorbing materials. Open the package carefully and check as follows:
HE Make sure the following items are included in the package.
(1) Model LF470 Electromagnetic Flowmeter.................. 1
(2) Instruction Manual ..........e.ec..ecesrcoresrccconcrccconeronernecn. 1
№ Inspect the flowmeter for indications of damage that may have occurred during shipment.
№ Маке sure the type and specifications of the flowmeter are in accordance with the
ordered specifications.
If you cannot find the items listed above or any problem exists, contact your nearest
Toshiba representative.
1.2 Storage
To store the LF470 flowmeter after opening the package, select a storing
place as follows and keep it under the conditions described below:
(1) Avoid places where there is direct sunlight, rain or wind.
(2) Store the product in a well-ventilated place. Avoid places of extremely high
humidity or extremely high or low temperature. The following environment is
recommended:
« Humidity range: 10 to 90% RH (no condensation)
« Storage temperature: -15 to +65° C
(3) Avoid places where vibrations or mechanical shock occur.
(4) Do not leave the converter housing cover open . Open the cover only when
you actually start wiring cables. Leaving the cover open can cause gradual
deterioration of circuit isolation.
(5) To put the flowmeter temporarily on the floor, place it carefully with something
to support it so that the flowmeter will not topple over
TOSHIBA 6F8A0802
2. Overview
Features
The LF470 electromagnetic flowmeter measures the volumetric flow rates of electrically
conductive materials on the basis of Faraday's Law of electromagnetic induction.
The device consists of two units: the LF470 detector, through which the fluid to be measured
flows, and the converter, which receives the electromotive force signals from the detector,
then converts the signals into the 4-20 mA dc signal.
Every type of electromagnetic flowmeter has the following features:
M Fluid flow is not obstructed and pressure loss is negligible.
B The process fluid's temperature, pressure, density or flow conditions has no effect on the
accuracy of the flowmeter.
HB The flowmeter output is directly proportional to the process flow rate, thus it is easy to
read its output.
The LF470 electromagnetic flowmeter detector has the following additional features:
(1) High accuracy, 0.8% of rate is possible for 1.0-10 m/s velocity range.
+0.8% FS is possible for 0.3-1.0 m/s velocity range.
(2) The flowmeter can be used to measure any fluids included acid and alkaline fluids,
for the reasons stated below:
* Ceramic is used for the detector pipe.
* Platinum is used for the electrode.
(3) The flowmeter is very small and light. Because of it, the flowmeter can be mount-
ed on panel.
(4) It is possible to connect to various pipes or tubes by using joints available in the
market.
TOSHIBA 6F8A0802
3. Names of Parts
The outline drawing of the LF470 flowmeter is shown in Figure 3.1.
E Outline Drawing
Taper pipe thread
(R female screw)
Adaptor for piping connection
Input signal cable nameplate
Excitation cable
Figure 3.1 Outline drawing of LF470 Flowmeter Detector
TOSHIBA 6F8A0802
4. Installation
Safety Precautions for Installation
/\ WARNING
№ Do not use the LF470 in an explosive atmosphere.
SQ Using this product in an explosive atmosphere
can cause explosion.
DON’T
/\ CAUTION
E Install a switch and fuse to isolate E Use an appropriate device to carry and
the LF470 from main power. install the LF470.
Power supply from main If his product falls to the
O power can cause electric O ground, injury, or
shock or circuit malfunction of or damage to
DO breakdown. DO the product, can be caused.
Ш Do not modify or disassemble the H Ground the LF470 independently
LF470 unnecessarily. from power equipment.
Modifying or
conse une ths product Operating this product without
malfunction or dama e to grounding can cause electric
DON’T this pro duct 5 DO shock or malfunction. |
E Do not work on piping and wiring The label shown left is placed
with wet hands. near the terminal board for
Wet hand lt i power input.
| lectrie shock, EE /N (A black border and symbol on
yellow triangle)
DON’T Be alert to electric shock.
TOSHIBA 6F8A0802
4.1 Location
To select the installation site, follow the precautions described below:
EM Avoid places where fluid runs in a pulsating form.
E Avoid places within the immediate proximity of equipment producing electrical
interference (such as motors, transformers, radio transmitters, electrolytic cells, or
other equipment causing electromagnetic or electrostatic interference).
‚№ Avoid places where excessive pipe vibration occurs.
BM Avoid places where there is direct sunlight. If this is unavoidable, use an appropriate
shade
BM Avoid places where corrosive atmospheres or high humidity conditions obtain.
BH Avoid places of too great an elevation or constricted areas where clearance
for installation or maintenance work is not provided.
BM Design piping so that the detector pipe is always filled with fluid, whether the fluid is
flowing or not.
M The LF470 detector has no adjustable piping mechanism. Install an adjustable short
pipe where needed.
BM Chemical injections should be conducted on the downstream side of the flowmeter.
TOSHIBA 6F8A0802
4.2 Mounting Procedure
/N CAUTION
H Use an appropriate device to carry H Turn off mains power before
and install the LF470. working on pipes.
If his product falls to the Working on pipes while
e ground, injury, of N power is applied can
malfunction of or damage cause electric shock.
DO to the product, can be DON’T
caused.
4.2.1 Installation Procedure
To mount the LF470, see Figure 4.1 and follow the procedures below.
(1) In case of method of piping by nipple and union
(1-1) Connect the R female screw of the LF470 with the nipple.
(1-2) Connect the nipple with the pipe by the union.
(2) In case of method of piping by jont
(2-1) Connect the R female screw of the LF470 with the joint.
(2-2) Connect the Joint with the pipe
Taper pipe thread
Example (1) (R female screw) x Example (2)
(7 || 4 Вы
| — —
О EE
4 eo, ^
I pipe
| union |
pipe nipple 69
— joint
Flow direction
Figure 4.1 LF470 flowmeter piping connections
NOTES:
(1)Preventing from leaking, seal up R male screw with sealant which 15 appropriate material to
the process fluid to be measured.
(2)Keep that the inner diameters of the nipple, the joint and pipe on the sides of the detector larger
than that of LF470. If not, the air bubbles will stagnate in the measuring pipe and they may dis-
— turb the normal measurement of flow rate.
TOSHIBA
6F8A0802
4.3 Piping Connections
1)
Required Pipe Length
If various joints are used upstream of the detector outlet, the straight pipe length as
shown in Table 4.2 is required.
Table 4.2 Required straight pipe length on the upstream side
L=5D
L = 10D
(1) 90° bent Detector
Detector
(5) Other valves (not fully opened)
¿4 Detector
DA
all
[<
L
ih
| y 3
+
|
|
L: Required straight pipe length—straight pipe length plus half length of the detector.
D: Nominal bore size (diameter)
NOTES
1.
The length of a reducer, if connected, can be counted as a part of the straight pipe
length.
No straight pipe length is needed on the downstream side. If a butterfly valve is
installed downstream of the detector, do not let the valve plate protrude into the
pipe of the detector
14
TOSHIBA 6F8A0802
(2) Pipe Orientation
The detector may be installed in horizontal, vertical or sloping pipe runs as shown in
Figure 4.2. However, except for horizontal installation, fluid should flow from lower to
upper directions. See Figure 4.3.
ra Flow direction
(a) Horizontal pipe installation
(b) Vertical pipe installation
Detector — и (c) Sloping pipe installation
Ground surface
Figure 4.2 Detector Piping Orientation
The electrodes should be positioned horizontally against the ground surface in any piping
installation. See Figure 4.3.
Electrodes
Detector
Cross-section A - A
Ground surface
— — — ho = ===". ===: EEE —— — —_ | ss
— x ——_ DD UD. O AA E —
Figure 4.3 Installation position of the detector
TOSHIBA 6F8A0802
(3) Flow Direction
Install the detector in accordance with the flow direction arrow on the detector. See Figure 4.4.
Flow direction arrow
Flow direction
> side
Figure 4.4 Flow direction arrow on the detector
(4) Preventing an Empty Pipe Condition
Design an upright pipe run (Figure 4.5) or sufficient head pressure (Fig. 4.6) at the
downstream detector outlet if there is a possibility of the detector pipe becoming emptied.
Upright pipe run
Detector
Detector == == | = == «=
eT
Figure 4.6 Detector with sufficient head pressure at downstream outlet
TOSHIBA 6F8A0802
(5) Supporting Pipe
Fix the relevant pipes installed on both sides of the detector by attach fittings, etc. to support
the pipe. By supporting the pipes, not only the pipe vibration is reduced but also the damage
to the pipes by the electromagnetic flowmeter's weight and the fluid mass. And 1t protect
from fluid leakage at flange face (see Figures 4.7 and 4.6).
Pipe support fittings [| Pipe support
5 69
I | AS | TT
7 EX
Adjust the center of pipe to
the position that electrodes Mounting board(option)
of LF470.
Figure 4.7 Example of Pipe Fixing Procedure
LO Be Not adjust the center of pipe to
— sr
the position that electrodes of
LF470.
Figure 4.8 Model Diagram of Unsupported Pipes
TOSHIBA
6F8A0802
5. Wiring
/N CAUTION
E Do not work on piping and wiring E Ground the LF470 properly.
with wet hands.
Wet hands can cause
system failure. O
Operating this product
without a grounding can
cause system
DON’T malfunction.
E Do not modify or disassemble the
LF470 unnecessarily. The label shown left is
Modifying or
. placed near the terminal
disassembling this product
lectric sh board for power input.
can cause electric shock, Be alert to electric
malfunction of or dam-
, shock.
DON'T age to this product.
Flowmeter accuracy may be affected by the way wiring is executed. Proceed
with wiring taking the following precautions:
(1) Select the cable runs away from electrical equipment (motors, transformers, or
radio transmitters) which causes electromagnetic or electrostatic interference.
(2) Deterioration of flowmeter circuit insulation occurs if the converter interior or
cable ends get wet or humidified. This in turn causes malfunction of flowmeter
or noise problems. Avoid a rainy day if the flowmeter is to be installed outdoors.
Even indoors, prevent water from splashing over the flowmeter. Try to finish the
wiring as quickly as possible
(3) The excitation and input signal cables transmit extremely minute signals. Pass each
of them alone and independently through a thick walled steel conduit, and loacate
it at as much a distance as possible from other great-current cabling, nor in parallel
with such cabling.
(4) The converter has a surge-absorbing barrier installed inside. Therefore, do not
conduct a withstand voltage test for the converter. To check the insulation of the
converter, use a voltage of 250 V dc or less.
(5) After wiring, attach the terminal cover of the converter.
TOSHIBA
5.1 Cables
(1) Standard cable
The standard cable shown in Figure 5.1 is connected when shipped.
The cable length can be ordered (option).
Table 5.1 Cables
Name Cable type Length Nominal Overall
cross-sectional area | diameter
Excitation Three-core chloroprene sm 0.5 mm? 6to 8 mm
cable cabtyre cable
i - d
Input signal | Two-core sheathe sm 0.3 mm? 6 to 8 mm
cable chloroprene cabtyre cable
(2) Elongate cable longer than Sm
By using scotch cast, the cable shown in Figure 5.2 can be connected with standard cable
(Sm).
Table 5.2 Cables
Name Cable type Nominal Overall diameter
| cross-sectional area
Excitation Three-core chloroprene cabtyre > mm? 11 to 13 mm
cable cable
Input signal | Two-core sheathed chloroprene 0.75 mm? 11 to 13 mm
cable cabtyre cable
Note: Total cable length must be within 30m .
19
TOSHIBA
5.2 External Device Connections and Grounding
The connections for the LF470 detector are shown in Figure 5.1 and 5.2.
Proceed with wiring as described in Section 5.3, “Wiring Procedure.”
IMPORTANT
tached cable, check the specification of the detector.
(1) The input signal cable and excitation cable are attached to the detector. Be sure to use the at-
(2) The converter side ends of the attached cables are covered with caps to prevent exposure to
humidity. Do not remove the caps from the cable until directly before wiring to the converter.
(3) Be sure to use thick walled steel conduit (22mm) for each the signal cable and the excitation
cable between the detector and the converter, and locate it as far as possible from other great
current cabling and it is not parallel with such cabling. Use flexible conduits at the cable outlets
of the detector. |
(4) The FG terminal of the converter should be grounded with 100 ohm or less ground resistance.
Use a heavy copper braid or wire (cross-sectional area 5.5 mm“ minimum) to ground the termi-
nal and make it as short as possible.
for Converter
ares abs
Excitation cable
Input signal cable | (Three-core chloroprene cabtyre cable)
(Two-core sheathed chloroprene
cabtyre cable)
|
|
| =
Thick walled
steel conduit
TOSHIBA 6F8A0802
e Grounding:
Ground the FG terminal (or the external grounding terminal) of the converter securely with 100
ohm or less ground resistance as shown in Figure 5.2. (The E terminal of the converter is
‘connected internally to the FG terminal and the converter case.)
Furthermore, if the pipeline is not of conductive material, grounding rings are needed for the
detector to stabilize fluid potential as the fluid potential is unstable and may cause incorrect
measurement.
Converter
terminal [y G | x D
В| \ ЦЕ | Y] [FG
“Twist th \ > \ |
e
shields >| NS External
CD +
ARE + grounding
terminal
Input |: |: 3: |: -
signal |:|::!: 100 ohm or less ground
cable |: |: : |: resistance
NEE]
[ > [ ~._ Excitation
lil cable
LF470
Figure 5.2 Wiring between the detector and the converter
TOSHIBA 6F8A0802
5.3 Wiring Procedure
Cable termination and cable connections are described below.
Use cables as specified in Table 5.1 and Table 5.2.
5.3.1 Cable Termination
/N CAUTION
№ Do not conduct wiring work when B Do not work on piping and wiring
power is applied. with wet hands.
Wiring while power is ap- Wet hands may result in
N plied can cause electric N electric shock.
shock.
DON’T DON’T
BM Input signal Cable
Remove each core coating for cable as shown in Figure 5.3. Next, attach the insulating sleeve
crimp-style terminals (Note). Then, connect to the converter’s terminal block À and B and
twist the shields together. Cover with the terminal contraction tubes before attaching the
crimp-style terminal and connecting to the converter’s terminal block G .
Note: Set the size of insulating sleeve crimp-style terminal as below.
Converter type size of insulating sleeve crimp-style terminal
LF420 M3.5
LF230 M4
Insulating sleeve crimp-style terminals
terminal contraction tubes
A Black
G Shield
B White
50 to70mm
a
71
Figure 5.3 Input signal cable end processing
TOSHIBA 6F8A0802
Notes:
Removing core coating for cable, be careful not to scratch and not to cut off cable and
shield.
Untying shields from cables as shown in Figure 5.4.
== a .Open shield by tools like tweezers.
shield
b .Pull the cable from shield.
cable
C .Stretch out shield.
Figure 5.4 Untying shields from cables
TOSHIBA 6F8A0802
Bl Excitation Cable
Remove each core coating for cable as shown in Figure 5.5. Next, attach the insulating
sleeve crimp-style terminals (Note). Then, connect to the converter’s terminal block X and Y.
Also, connect the red cable core to converter’s terminal block E.
Note: Set the size of insulating sleeve crimp-style terminal as below.
Converter type size of insulating sleeve crimp-style terminal |
LF420 | M3.5
LF230 M4
Insulating sleeve crimp-style terminals
(Note)
X Black - *
Е Кеа = —
Y White —
DI —
50 to 70mm _
Figure 5.5 Excitation cable end processing
5.3.2 Cable Connections
Refer to the converter instruction manual, to connect the terminated cable wires to the
converter’s terminal board.
IMPORTANT
Connect the wires securely to the terminal board. A loose connection may result in
unsatisfactory flowmeter performance. Make sure the wires are securely connected.
TOSHIBA 6F8A0802
6. Operation
/\ CAUTION
E Do not touch the LF470 main body when high
temperature fluid is being measured.
The fluid raises the main
body temperature and can
cause burns when touched.
DON? T
6.1 Preparatory check
Follow the procedure described below to prepare before starting the flow measurement.
System Check
M Check the wiring between the converter and related instruments,
M Check the wiring between the converter and the detector.
M Make sure all the bolts of connection flanges on which the flowmeter is mounted
“securely tightened.
NM Make sure the direction of flow arrow is in accordance with actual flow.
№ Make sure the flowmeter is grounded with 100 ohm or less ground resistance.
EH Make sure the converter housing covers are securely tightened.
Placing System On-Stream
M Let the fluid go through the detector pipe. When the detector is filled with the
fluid, stop the fluid and keep it still in the detector pipe.
Supplying Electric Power
| M Make sure the power supply is as specified.
Checking Converter Parameters
M Check the configuration parameter settings. Refer to Chapter 7, “LCD Display
and Controls,” Chapter 8, “Configuration Parameter Setting,” and Chapter 11,
“Communications Function.”
Zero Adjustment
@ Wait for 30 minutes to warm up the flowmeter. Then making sure the fluid holds
still in the detector pipe, starts the zero adjustment.
Refer to 6.2, “Zero Adjustment.”
On-line measurement
After checking the items and conducting the zero adjustment as listed above, let the fluid go
through the detector pipe. Output (4-20 mA dc) directly proportional to the flow rate can be
obtained.
TOSHIBA 6F8A0802
7. Maintenance and Troubleshooting
A CAUTION
BH Do not conduct wiring work when | H Do not touch the LF470 main body
power is applied. when high temperature fluid is be-
| ing measured.
Wiring while power is The fluid raises the main
applied can cause electric body temperature and can
DON’T shock. DON'T cause burns.
7.1 Maintenance
IMPORTANT
It is recommended that the detector pipe be cleaned once a year.
mM Cleaning the pipe wall inside of detector
If the fluid to be measured contains slurry; a high concentration of electrically conductive
solids, the slurry may accumulate as sticking on the pipe wall inside of detector.
The sticking causes a reduction of flow measuring outputs when it is not cleaned inside pipe
of detector for a long time.
The flowmeter needs to make sure it remains around the wall inside pipe or not when the
following condition had happened.
(1) The flowmeter becomes a reduction of its output.
(2) The flowmeter cannot improve its output in spite of being calibrated.
The flowmeter is required to remove along with clean it using a soft brush. It will be come
back the usual and stable flow measurement after cleaning.
The pipe wall is never scratched when cleaning.
*Toshiba recommends to clean inside pipe periodically when this condition will be-
come easily.
*Tt is better to choose the suitable diameter which becomes more than 3 m/s as its
flow velocity to avoid this condition generally.
Notes: Before uninstalling the flowmeter(detector) from the pipe, necessarily confirm the
fluid of temperature and chemical property, and empty the fluid from detector. Pre-
pare the way to protect operator and system from bad influence; high temperature
fluid and chemical property
TOSHIBA 6r8A0802
m Operative life
The operative life of this flowmeter is 10 years from the date of shipment. The life of the
flowmeter differs depending on the environmental conditions and the way it was used. To
extend the life of the flowmeter, inspect the flowmeter periodically and clean or replace
components if necessary.
TOSHIBA 6F8A0802
7.2 Troubleshooting
If a problem occurs while using the LF470, follow the flowcharts described below.
You may find a way to solve the problem. The flowcharts are based on three symp-
toms (1) to (3). If you cannot solve the problem, contact your nearest Toshiba repre-
sentative.
(1) Flow rate is not indicated.
(ow)
Y
NO Use the correct power supply
Are power supplies correct _
“| for each device.
for each device?
>
YES
Y
RN и
Are power and ГО cables \ NO Install the cables correctly.
installed correctly? / Refer to Chapter 5, “Wiring.”
YES
Y | Replace the fuse with a new
YES .
< Is the fuse not burnt? > one. Refer to the Instruction
Manual of the Converter.
| NO
v
\ NO Set correctly.
Is the flow range correctly Refer to the Instruction
set?
/ Manual of the Converter.
YES
Y
Is the arrow direction on \ NO Install the detector correctly.
the detector in accordance » Refer to 4.2, “Mounting
. | Procedure.”
with the actual flow? /
YES
A
Contact your nearest Toshiba
representative.
TOSHIBA 6F8A0802
(2) Flow rate indication is not correct.
ow)
у \ Set correctly.
Is the flow range correctly NO >| Refer to the Instruction
set? / Manual of the Converter.
YES
\ Perform the zero adjustment.
Is zero point correctly set? NO »| Refer to the Instruction Manual
/ of the Converter.
YES
У
Is the excitation current
NO Set correctly.
value as stated on the >
Refer to the Instruction Manual
flow direction tag?
of the Converter.
| YES
Is the inside wall of detector\ YES | Clean the inside wall of the
pipe contaminated? / ‘| detector pipe.
|, NO
Is the output load resis tance\ NO Design the output circuit so that
—> the output load resistance is less
as specified? /
than 1 kQ.
YES
Y
Are there two load YES
Connect the two load resistors
resistors connected to the >
in series, if necessary.
A0
output in parallel?
NO
X
Is accuracy calculated as follows? | NO
| Calculate as shown on the left.
(Measured flow rate)-(Actual flow rate) х100%
\ Actual flow rate
YES
У
Contact your nearest Toshiba
representative.
TOSHIBA 6F8A0802
(3) Flow rate indication is not stable.
ow)
Y
Is power supply voltage \ NO | Use a power supply within
within the specified range? / ‘| the specified range.
YES
У
Are cables securely \ No Connect each cable securely
connected? / ”| to the terminal board.
YES
Ground the flowmeter with a
Is the flowmeter grounded \ NO copper braid or wire(5.5 mm?
with 100 Q or less ground >| minimum) to a good earth
resistance? / ground (100Qor less ground
VES resistance).
У
Is the detector pipe filled \ NO Design piping so that the
with fluid? / detector pipe is filled with
fluid all the time.
YES
A
Is the fluid carrying \ YES Design piping so that the fluid
bubbles? / » does not carry bubbles.
NO
Y
Is there high-voltage or large \ YES Install the flowmeter away
current cable or equipment » from equipment producing
near the flowmeter? / electromagnetic or
| - electro- static interference.
NO
У
Contact your nearest Toshiba
representative.
TOSHIBA 6F8A0802
8. Principle of Operation
The operating principle of the electromagnetic flowmeter is based on Faraday's Law of
electromagnetic induction and it is designed to measure the volumetric flow rate of fluid. An
insulated pipe of diameter D is placed vertically to the direction of a magnetic field with
flux density B (see Figure 8.1). When an electrically conductive fluid flows in the pipe, an
electrode voltage E is induced between a pair of electrodes placed at right angles to the
direction of magnetic field. The electrode voltage E is directly proportional to the average
fluid velocity V.
The following expression is applicable to the voltage.
E=KxBxDxV[V]..... (Eq. 8.1) E = induced electrode voltage [V]
K = constant
B = magnetic flux density [T]
Volumetric flow rate Q [m/s] is: D = meter pipe diameter [m]
V = fluid velocity [m/s]
7 xD
Q = Am Xx Veereeecconcconos (Eq. 8.2)
Using the Equation 8.1 and 8.2
4
E=KxBxD x E xD: xQ
4xKxB
E= —xQ............ Eq. 8.3
7 xD Q (Eq )
Therefore, volumetric flow rate is directly proportional to the induced voltage.
ff
- J J CT
Square-Wave Excitation
Figure 8.1 Principle of Operation
The LF470 electromagnetic flowmeter uses the square-wave excitation method, which pro-
vides long-term stable operation. With square-wave excitation, the LF470 offers reliable
measurement without being affected by electrostatic or electromagnetic
interference, or electrochemical polarization between the electrodes and the fluid to be
measured.
9. Specifications
The flowmeter specifications and the type specification code used when ordering the flowmeter
are described in this chapter.
9.1 Flowmeter Specifications
E Overall Specifications
Meter size: 2.5mm(0.1”), 4mm(0.16”), 6mm(0.25”)
Measurement range in terms of flow velocity:
0-0.3 m/s to 0-10 m/s
System accuracy: See the following table.
Table 9.1 System accuracy
Flow rate as a Accuracy
percentage of
range 0.3 — 1.0 m/s 1.0-10 m/s
50 to 100% +0.8% of rat
о +0.8% of FS E
0 to 50% +0.4% of FS
Note: The accuracy above is measured under standard operating conditions at
“Toshiba's calibration facility.
Fluid conductivity: 50 uS/cm minimum
Fluid temperature:
Adaptor Material Fluid temperature
Stainless steel and other
metal —10 to +120 °C
(Standard)
Polyvinyl chloride
(shock-resistant) —10 to +60 °C
(Option)
Ambient temperature: —10 to +60 °C
Structure: IP67(NEMA4) Watertight
Power consumption:
Converter type Power supply
LF420 Approx.10W(17V A)
LF230 Approx.14W(25VA)
Fluid pressure: —0.1MPa to 1MPa
Pipe joints: Re(PT)1/4 female screw (Standard)
Rc(PT)1/8 female screw (Option)
Rc(PT)3/8 female screw (Option)
Re(PT)1/2 female screw (Option)
NPT 1/4 female screw (Option)
TOSHIBA
Principal materials
Case— Cast Aluminum
Lining— Ceramic
Electrodes—Pt-Ir
See Table 9.3 Type Specification Code for optional materials and other related
information.
Coating: Phthalic acid resin coating pearl-gray colored
Mass: Approx. 1.0kg (for each size excluding cables)
Table 9.2 Relation between liquid velocity and flow rate at each meter size
Meter size Flow velocity
mm | Inch 0.3 m/s 1 m/s 10 m/s
25 | оз |--0:005301 m/h 0.01767 m*h 0.1767 m/h
| 0.08835 I/min 0.2945 1/min 2.945 1/min
4 | 016 0.013570 m°/h 0.04524 m°/h 0.4524 m’/h
— 0.2262 1/min 0.7540 l/min 7.540 l/min
6 | 0,25 0.030540 m*/h 0.10180 m*/h 1.0180 m*/h
0.5089 U/min 1.6965 l/min 16.965 l/min
33
TOSHIBA 6F8A0802
9.2 Type Specification Code
Table 9.3 Type Specification Code (Model LF470 Detector)
Model Specification Code Description
1 2 3 4 5/16/17/819|10/11|12113|14
L F 4 7 0 LF470 Detector
Meter size
2 2.5mm (1/107)
4 4mm — (1/67)
6 6mm (1/47)
Assembled converter
D LF420
E LF230
Pipe connection port (adapter)
Re(PT)1/4 female screw (standard)
Re(PT)1/8 female screw
Re(PT)3/8 female screw
Re(PT)1/2 female screw
NPT1/4 female screw
other
Pipe connection material
316 stainless steel (standard)
Ti (titanium)
Polyvinyl chloride(shock-resistant) + Ta (tantalum for) grounding ring plate
Polyvinyl chloride + Pt-Ir grounding ring plate |
Other
Gasket material
Fluoric rubber for acid-resistant (Standard) (Notel)
Fluoric rubber for alkali-resistant (Notel)
other
Mounting board
Not provided (standard)
Provided (SUS304)
Flow and calibration velocity range
0.3 to 10 m/s (Standard range calibration)
0.3 to 10 m/s (Specified range calibration)
other
Dedicate Preformed Cable length
Sm (standard) (Note2)
5m or more (extension cable dia. 12mm, + Scotch cast connection)
5m or more (extension cable dia. 7mm, + Scotch cast connection) (Note2)
5m or more (extension cable dia. 7mm, with no connector termination) (Note2)
Coating
A | phthalic acid resin coating, pearl-gray colored (standard)
Z | other
нос»
мт »>
нос
y >
N= p>
caw»
Notel: Consult Toshiba before ordering when choose materials at the wetting parts.
Note2: A set of cable ground sized 7mm diameter for converter is packed when the code “A”, “C” or “D” are chosen.
i i i i i i Ё i i
TOSHIBA 6F8A0802
10. Outline Dimensions
Weight: approv. 1.0kg
©
— ——— ;—;—z——;——n o]
31
I “ 10 =
30
N
— He -—F— Or —
unit: mm
Figure 10.1 LF470 Outline Dimension
TOSHIBA 6F8A0802
| VE”
ol o (M AN AS, (TN
Y CN = N 7} + > OU
Y A.
{ \ | Ne у
4-5 DIA. holes
(for fitting in LF470)
| 2-6 DIA. holes
(for installation)
unit: mm
Figure 10.2 Mounting plate (option)
TOSHIBA 6F8A0802
USER'S FORM
NOTES
Unit purchased from
Name
Title
FEE mm Ear mm wh SE ME EE EEN EE ME WE vee vem == mmr ME EE EE ED EEF EE Wr WE A SE EE EE EE ES EE WE WE am SE AR am aE am am am о!
oem mk MER EE EEE EE EEE Amr wer = den Mk MA EER ME MER EE EE WE PW eA EA EE EE EN EE WE Bm Ee Ay ER AE ER ER AE ER нк т wm ey = 4
Em vey vem mk kel EE GE GEE EDF WE WE WE Gwe bed AE EE EE EE EE Er WE wn SE AN SE EE ER EE ER ER AW ee = Em == es wa Em
че === 5 EE EE EE EE Er Mr ww er vel EE EE ED EE EE Wr mr MR SE ER EE EE ES EE WE AW ew mm = к SG EE ER ER = ar a
o Er Em el SE EE EE tk ME ER EE EN WE ES EE Er mm we eh
om mr Er mew kmh ME EE EE EE EE EE Er mr beh EE EE EE EE EE EE dk ME EE EE ES EE WE EE WE WE ew A Em am
4 a — EE ame Er ww wer AE EE EE ME mm Wr wr mk AA FE EE EE EE EE EE Er Wr == == AR SR A ED ER WF EE WY We SR Am Em ER Em == Em Ew
mom mm wm war wer il EE EE EE Er Er e SI EE EE EE EE EE WE WE WW Sm mm SE SE ER EE ES AF WE что =f SR AR AR O EE Em EE Em Ew +
Model/Specification Code LF470
Serial No.
PL === = SE ER AR aE ASE Em = Em
Industrial Equipment Department
1-1,Shibaura 1-chome, Minato-ku, Tokyo, 105, Japan
Tel.: (03)3457-4900 Fax.: (03)5444-9268
TOSHIBA 6F8A0802
25 E A0 & REVISIONS
EEE
REV. MARK | ~—3 EM : EE RANE ERE HE ja RE
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