Toshiba LF494 Automobile Parts User Manual

TOSHIBA 6F8A0774
ELECTROMAGNETIC FLOWMETER
MODEL LF494 / LF404
INSTRUCTION MANUAL
TOSHIBA COHPORATION
TOSHIBA 6F8A0774
| NOTICE a |
This Manual is designed to assist in installing, operatitg, and maintaining the
LF494/LE404 electromagnetic flowmeter, For safely reasons, and 10 obtain the оро-
mum pertormance from the flowmeter, read this Manual thoroughly before working
with the product. Keep the Manual within easy reach for reference whenever necded.
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
nr other critical control lines directly affecting human safety.
e “Control systems of medical equipment, including life support machines.
NOTES
I. 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,
HART is a registered trademark of the HART Communication Foundation.
Tefion is a registered trademark of the DuPont Company.
Forth Edition
October, 2000)
e Copyright 1999, 2000 by Toshiba Corporation. Al rights reserved.
TOSHIBA 6F3A0774
SAFETY PRECAUTIONS
Safety signs and labels affixed to the product and/or described in (his manual give important
Information for using the product safely. They help prevent damage to property and obviale
hazards tor persons using the product,
Make yourself familiar with signal words and symbols used for safety signs and labels, Then
read the safety precavtions that follow to prevent an accident involving personal injury,
death or damage to property.
Explanation of signal words
The signal word or words arc used to designale a degree or level of hazard seriousness.
The signal words used for the product described in this mannal are WARNING and
CAUTION.
Indicates a polentially hazardous situation
A WARNING which, If not avoided, could result in death or
SCNIOUS Injury.
Inticates a potentially hazardous situation
A C AUTION which, if nol avoided, may result in minor Lo
moderate injuries or in property damage.
Safety symbals
The following symbols are used in safety signs and labels affixcd to a product and/or in the
manual for giving safety instructions,
Indicares 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 aciion.
l'he mandatory action is indicated by a picture or lext inside or next to
the circle.
Indicates a potential hazard, The potentially hazardoos situation is
indicated by a picture or text inside or next to the triangle.
| _
> @O
TOSHIBA 6F8A0774
SAFETY PRECAUTIONS
Safety Precautions for Installatien and Wiring
/\ WARNING
Я 1to not disconneci while circuit is live unless location is known to be nonhaz-
ardous,
Live pari of electric circuit or a high temperature department can cause
explosion.
Lg
OO
1%
—
Elo not modify or disassemble the enclosure.
©
Strength degradation and defects of enclosure can cause explosion.
DON'T
E Do not use parts of other products.
Protective performance degradation for hazardous location can cause
©
explosion.
DON'T
№ Do not live circuits While assembly of all components is not over,
Protective performance degradution for hazardous location can cause
explosion.
с
1%
=
—
@ Install per the National Electrical Code for the US (NEC, ANSYNFPA 70)
and the Canadian Electrical code for Canada (CEC, CAN/ CHA-C22.1).
Unsuitable conduit connections for hazardous location can cause ex-
plosion.
A CAUTION
E Turn off mains power before working | ™ Use an appropriate device to carry
on pipes. and install the LF494/LF404,
DO
lt this product [alls to the
ground, Injury, or malfunction
af or damage to the product,
| can be caused,
8 Install a switch and fase to isolate the | ® Do not modify or disassemble the
LF4%4/LF404 from mains power, LF494/LF404 unnecessarily,
Ч Modifying ar disassembling
Power supply from mains ,
this product can cause electric
power can cause electric shock. malfunction of or
DO shock or circuit breakdown. DENT damage to this product.
Working on pipes while
power is applicd can cause
DO electric shock.
TOSHIBA 6F8A0774
SAFETY PRECAUTIONS (continued)
Safety Precautions for Maintenance and Inspéétion
/A\ CAUTION
® Turn off mains power before E Ground the LF494/LF404 indepen-
conducting wiring work. dently from power equipment,
… Operating this product without
Wiring whilc power is ap-
O grounding can cause electric
plied can cause electric shock. shock or malfunction.
DO DO
M Do not conduct wiring work with bare | Use compression terminal lugs with
hands. insulation sleeve for the terminal
block and GND terminal.
Loose connections can cause
electric shock, fire from
EXCESSIVE COITENE Dr system
malfunction.
Remaining electric charge
even if power is turned of f
can stili cause electric shock.
5
1%
=
+
E Do not work on piping and wiring with
wet hands. The label shown left is placed
DO
near the terminal board for
Wet hands may result in power input.
electric shock, (A black border and symbol on
yellow triangle}
©
| DON’T Be alert to electric shock.
E Do not touch the flowmeter main E Do not conduct wiring work when
body when high temperature fluid is power is applied.
being measured.
The fluid raises the main
hody temperature and can
cause burns when touched.
Wiring while power is applied
can cause electric shock,
J
1%
=
=
DON'T
B Do not conduct wiring work with wet The label shown left is placed
hands. rear he terminal board for
N /\ power inpul.
Wet hands may result ig (A black horder and symbol on
electric shock. yellow triangle}
| CONT a Be alert to electric shock.
E Do not use a fuse other than the one Use a rated fuse as follows:
specified. Fuse rating:
Using a fusc other than the * LA/250Y for 100 10 240 ac or 110 de
one specified can cause » 2A250V for 24 Y de
system failure, damagé or Dimensions:
malfunction. Diameter 5.2 mm > 20 mm
DON'T Melting time characteristic:
Normal blow
Disclaimer
Toshiba dees nol 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 Lo, the
occurrence of any event of force majeure (including fire or earthquake} or the misuse of
this product, whether intentional or accidental.
TOSHIBA 6F8A0.774
Handling Precautions
B To obtain the optimum performance from the LF494/LF404 flowmeter for years of
continuous operation, observe the following precautions,
(1) Do not store or install the flowmeter in:
* places where there is dircet sunlight, If this is unavoidable, use an appropriate
sunshade,
* places where excessive vibration or mechanical shock oceurs.
* places wherc 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) Exccule wiring securely and correctly,
Ground the ficwmeter with 100 ohm or less ground resistance, Avoid à common
ground used with other equipment where earth current may How. An independent
ground 1s preferable
(3) Seal the cable thoroughly at the cable gland so that the cable is kept airtight. The
apparatus shonid not be provided with the cable gland. Piease prepare yourself for
the cable glands which could be used in Division 2 hazardous locations.
(4) Make sure the fluid 10 be measured will not freeze in the detector pipe. This can
cause Jamage to the detector pipe.
(5) Select appropriate wetted materials suited for the process fluid to be measured.
Otherwise, fluid leakage due to corrosion can be caused.
(6) The converter housing covers are lightened securcly at the time of shipment. Do
not remove these covers or glands unless it is necessary to wire new cables or re-
place old ones. Otherwise, gradual deterioration of circuit isolation or damage to
this product can be caused. Tighten the covers securely again if they have heen re-
moved.
TOSHIBA 6F8A0774
Handling Precautions (continued)
| о
{7 Observe the lollowing 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 ar 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 ta the flowmeter electronics.
(8) This product may cause interference (0 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 transecivers or cellular phones may cause interference
to he flowmeter if they are used near the installation site. Observe the following
precautions when using them;
* De not use a radio transmitter while the cover of flowmeter converter is open.
* Do not use a transcéiver whosc output power is more than 5 W,
* Move the antenna of a radio transmitler at least 50 cm away [rom the flowmeter
and signal cables when using it.
* Do not use a radio transmitter near the Élowmeter while it is operating ontine,
The transmitter's output impulse noise may interfere With the flowimneter,
« Do not install à radio transmitter antenna near he flowmeter converter and
signal cables,
(10) For reasons of flewmeter failure, inappropriate parameters, unsuitable cable con-
hections or poor installation conditions, thé flowmeter may not operate properly.
lo prevent any of thèse problems causing a system failure, it is recommended that
vou have préventive measures designed and installed on the flowmeter signal re-
ceiving side.
TOSHIBA | 6F8A0774
Table of Contents
SAFETY PRECAUTIONS 000000000 ere eee a a ea aa esse» 2
Handling Precautions - «ccc rr ertares ee ae 5
1. Product Inspection and Storage ~~~ creel 9
1.1 Product Inspection Ba dE NL LL LA ee ma ae raradramde romanas ia. y
1.2 Storage + ccc a ee ae ne 9
2. Overview Fr hr Ea bh ea hue a EE EE Eh ee a ee ea eae ee ee are rada 10
3. Names of Parts °°" eee Li
4. Instal lation PUF AE 11 511 1 EUR 1814111117 1 1 1 M Ka a REF à 14
4.1 Location Ed EA ERA RAE ANA Ea rra aros 15
4.2 Mounting Procedure ++ 70077 ieee 16
43 Piping Connections tit ee sean ae LL Le ta
5, Wiring +00 6er aaa recaer se 33
51 Cables Sm rm maa ma Ea ss esau aE aa rah hae hee ea mE te eae. 25
3.2 External Device Connections and Grounding ~ cc» orm orm ees 25
5.3 Digital YO Connections +7 erre etarra aran. 27
3.4 Wiring Procedure +++ 1808 AEREA 28
Û. Operation ar Ra aa E Aaa RE aa aa 30
Él Preparatory Check TOP ARNESES Ra 30
6.2 Zoro Adjustment = ccc er ee тонна an 31
7. LCD Display and Controls rer carre nee 32
7.1 Outline OR RARA RAE AN rra 172
7.2 Display Formal N 34
7.3 Basic Operations +7 > nt Ce eee 6
7.4 Configuration ltems Sclection Table ct 00e ee rares eee 42
7,5 Password Input ‘10e tete tt tree es es ses aan 43
. Configuration Parameter Setting © +011 tete Teen etes as» 44
8.1 Configuration Herms teca EA As 44
8.2 Checking or Changmg Parameters +55 ee eee eee res 4d
9. Calibration "TT TT ET ee Cee eae eae LO!
91 Calibration Items +--+ ae rar ea eee aaa eee, 101
9.2 Calibration Using Converter Signal Source -- =o - 0 roo -v move 107
TOSHIBA EFBAO7 74
10. Digital I/O Functions —-----7 700 moe nas es 106
10.1 Digital YO Specifications +57 mmr e a ses ae se 17
10.2 Totalizer and Pulse Output ©1811 TT tee 108
10.3 Multi-range Functions +77 eres 113
10.4 High and Low Limit Alarms ttc tree ee eee es 118
19.5 Empty Pipe Alarm ++ 11 +100 eee tee ts eee ae a ae ea aa a aa 120
10,6 Presct Point Output «ccc vemos 121
10,7 Remote Zero Adjustment o ao arena area 125
10.8 Remote Sclection of Fixed Value Output += eee 126
10.9 Converter Failure Alarms +7 terrena erre reee 127
11. Communications Function +--+ onee Le aaa о 128
11.1 Communications with the AF100 Terminal г отктллеоеонко но 128
11.2 Communications Procedure = o-oo» oreo ooe ses eee 129
11.3 Cautionary Notes on Communications Cha 130
12. Self-Diagnostics and Alarms ++" TTT 131
12.1 Self-Dhagnostics «omer een LE 131
12.2 Output Status for Errors and Alarms +1 -<< CT tree eee ee ae eee» 134
13. Maintenance and Troubleshoating +'-7 eee area eee ses es 135
13.1 Maintenance 83114242 11211 1 1 1 41 11 LL C1 4 Ra 1 1 1 1 F1 20 à 136
13.2 Troubleshooling +101 006- 005 Sa eee a ae Lee ea ne eee 130
14. Principle of Operation ~~ cco versie onan aa 147
15. Specifications ao KRAFT RAR Ka RR 0 143
15.1 Flewmeter Specifications ------ onan 143
12.2 Type Specification Code ++ teta 148
l6. Outline Dimensions . +70 00 7er aerea 151
Appendix 1. Electromagnetic Compatibility and Low Yoltage Safety ----- 152
Electromagnetic Compatibility - + 0» -- ovo een 152
Love Voltage Safety = «= vv ro rrmr meneame 153
TOSHIBA 6F8A0774
1. Product Inspection and Storage
Upon armival of the product package, open the package and check the items contained inside.
If you do net 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 LF494/] F404 clectromagnetic [owmeler is shipped in a cardboard container filled with
shock-absorbing materials. Open the package carefully and check as follows:
BM Make sure the following items are included in the package.
(1) Model LF494/1.F404 Electromagnetic Flowmeter...... 1j
(2) Instruction Manual .......... ee eeeericarrieeeeee aora na aces 1
@ Inspect the flowmeter for indications of damage that may have occurred during shipment.
@ Make sure the type and specifications of the flowmeter arg in accordance with the
ordered specifications.
If you cannot [ind the items listed above or any problem cxists, contact your nearest
Toshiba representative,
1.2 Storage
To store the 1. F494/LF404 flowmeter alter 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 weli-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 Ihe cover only when
vou actually start wiring cables. Leaving the cover open can cause gradual
deterioration of circoil 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 EFSAU7 a
2. Overview
The LF494/LF404 electromagnetic flowmeter can be use in the following hazardous (clas-
sified} locations.
(13 FM Approval
Class |, División 2, Groups А, В, С and D,
Class II, Division 2, Groups F and G
Class Uf
(2) CSA Certification
Class I , Division 2, Groups A, B, Cand D.
Class Il, Division 2, Groups E, F und G
Class II
The device measures the volumetric flow rates of electrically conductive materíals on
the basis of Faraday's Law of clectromagnetic induction.
The device consists of two units: the detector, through which the Muid to be measured
flows, and the converter, which receives the electromotive force signals from the
detector, then converts the signals into the 420 má de signal.
Model LF494/LF404 is a sanitary electromagnelic flowmeter designed for applications
handling food and beverages. Sanitary flowmeters must be structured in such a way that
operation and handling is simple, easy and thorough for the purpose of samitary control
such as cleaning, sterilizing and drvine. The flow-meter has no obstacles in the flow
stream and it1s designed lo provide indispensable conditions for sanitary control and is
[it for flowrate measurement for food and beverages.
Features
Model LF494/LF404 sanitary flowmeter has the following features:
(1) Fluid Now is not obstructed and pressure loss is negligible.
(2) Toshiba's original notsc-suppression circuit with signal processing capabilities ensures
a stable cutpul.
(3) Has no moving parts and flow indication is quick with high accuracy cven under low
flowrate measurement conditions.
(4) Equipped with a ferrule, compatible with 15C clamp connection, at both ends of (he
detector. They can be mounted or dismounted casily and securely.
(5) No obstacles in the flow stream and nowhere remains the fluid along the detector pipe.
Thus deterioration or corrosion of fluid does not occur,
(5) High accuracy, +0,5% of rate is possible for 03-10 m/s velocity range.
(3.1 to £.3 m/s range is available optionaliy.
(7) The flowmeter has various flow measurement output and control functions as standard
specifications and the options! LCD display for convenient parameter settings.
* These functions can be selected with control keys on the panel,
(5) Intelligent functions
* The widely used HART protocol communications system is used as a standard
feature. 1IART (Highway Addressable Remote Transducer) is a communications
protocol lor industrial sensors recommended by HOF (HART Communication
Foundation).
7) An easy-lo-read LCD display (2-line x i6-character display) (optional)
} play Р
* The backlit LCD display can be read even under paor lighting conditions,
— 10 —.
TOSHIBA 6F8A0774
3. Names of Parts
The outhne drawing of the LF4Y4/LF404 flowmeter is shown in Figure 3.1 and the in-
lernal views of the LF404 converter are shown in Figures 3.2 and 3,3,
IMPORTANT
The apparatus should not be provided with the cable glands,
Please prepare yourself for the cable glands which could be used in Division? hazardous locations.
E Outline Drawing Converter
Loasing cover
Éar terminal board
Port for power cable
(1/2-14NFT}
JAN
Fort for IO cable
{1/2-14NPT)
Eluw directions
arrima
Housing cover for —_
Untérnal éfecironies
— Г | |
Female
LF494/LF404 without LCDdisplay (standard)
- Cunveder
Housing cover
for lecrminal board
art for mer cable
CTA
(1/2-14NPT) Ps
Port (or I'D cable
liz 4NET
Housing cover fur
LCD display
Ortundino terminal
©
Detector
Гол
1F34941.1404 with LCD display (optional)
Figure 3.1 Outline drawing of LF494/LF404 Flowmeter
TOSHIBA 6F8A0774
E Terminal Board of CLIF404 Converter
Internal grounding terminal
Power supply terminals
External grouncdina
lerminal
Common for IL DOI and DO2
Figure 3.2 Terminal Board of LF404 Converter
TOSHIBA
6F8A0/774
E Control switch or keys of LF404 Converter
LED indicator for
Zero Adjusiment
Starl swilch [or Zero Adjustment -——
{ on-stream al zero flow rale )
LF44 without LCD Display
LCD display
TOSHIBA
LEA OO
Control keys
LF404 with LCD Display
Figure 3.3 Control switch or keys of LF404 Converter
TOSHIBA | 6F8A0774
4. Installation
Safety Precautions for Installation
/N WARNING
E Do not live cireuits under environment of explosive atmospheres.
N [Live part of electric circuit or à high température department can
cause explosion.
DON'T
& Do not use parts of other products.
Protective performance degradation for hazardous location cam!
cause explosion,
J
-
—
№
not live circuits While assembly of all components is not over.
5
Protective performance degradation for hazardous location can
canse explosion.
DONT
HB Install per the National Electrical Code for the US (NEC, ANSI/NFPA 70)
and the Canadian Electrical code for Canada (CEC, CAN/CSA.C22.1).
Unsuitable conduit connections for hazardous location can cause
explosion.
ZN CAUTION
Ш Install a switch and fuse to isolate E Use an appropriate device to carry and
the LF4%4/1.F404 from main power. install the LF494/LF404.
Power supply from main
power car cause electric round, injury, Or
shuck or circuit malfunction of or damage 10
DO breakdown. DO the product, can be caused.
If his product falls to the
E Do not modify or disassemble the B (round the LF494/LF404
LF424/LF404 unnecessarily, independently from power equipment.
Modifying or
disassembling this product
can cause electric shock,
malfunction or damape to
Operating this product withoul
groundmg can cause electric
DON'T this product. DO shock or malfunction.
B Do kot work on piping and wiring The label shown icf is placed
with wet hands. near the terminal board for
Wet hands may result in Power Input,
electric shock (A black horder and symbol on
yellow triangle)
DON'T Re alert to electric shock.
TOSHIBA
4.1 Location
6F8A0774
To selcet the installation site, follow the precantions described below:
Avold places where Поза runs in à pulsating form.
Avoid places within the immediate proximity of equipment producing electrical
interference (such as motors, transformers, radio 1ransmitters, electrolytic cells, or
other equipment causing electromagnetic or electrostatic interference).
Avon places where excessive pipe vibration occurs.
Avoid places where there is direct sunlight. If this is unavoidable, use an appropriate
shade
Avoid places where corrosive atmospheres or high humidity conditions obtain.
Avoid places of loo great an elevation or constricted areas where clearance
tor installation or maintenance work is not provided.
Design piping so that the detector pipe is always filled with fluid, whether the fluid is
flowing or nol
The LF494 detector has no adjustable piping mechanism. Instali an adjustable short
pipe where needed.
Chemical injections should be conducted on the downstream side of the flowmeter.
TOSHIBA 6F8A0774
4.2 Mounting Procedure
/\ CAUTION
M Use an appropriate device to carry B Turn off mains power before
and install the LF494/LF404, working an pipes.
If his product falls to the Working on pipes while
O ground, injury, of N power 15 applied can
malfunction of or damage cause electric shock.
DO to the product, can be DON'T
caused.
4.2.1 Pipe checks
Before installing pipes, check For any leaning as illustrated in Figure 4.1. An attempt to
unreasenanly connecting pipes that are inclined may lead to a detector breakdown ог
fluid leakage. Connecting pipes in an eccentric state may alse cause local wears and tears
of linings, as well as measurement errors.
Before installing pipes, make sure lo flash the interior of the pipes to remove deposited
matters.
| Inclination
Figure 4.1 Pipe leaning
TOSHIBA ) 6F8A0774
4.2.2 Installation Procedure
The EF494/LF404 adopts the ISO 2852 clamp connection method.
To mount the 1.5494/L.F404, scc Figure 4.2 and follow 1he procedure below:
I. Welda Icrrule of tic detector to the process pipe on both upstream and downstream
sides.
2. Install the LF4941 1404 between the two ferrules which were welded 10 thé process
pipes above,
3. Install a gasket between the grooves of the ferrule on the detector side and that of the
ferrule en the process pipe for both upstream and downstream sides. Then place a
clamp ovér thé joined lerrules as shown in Figure 4,2 and tighten with the screw for
both upstream and downstream process pipes.
IMPORTANT
When high-temperature fluid is being measured, radiant heat from the detector pipe surface and
adjouning pipes may cause the ambient temperature of the converter lo go above 60 °C. If the
ambient temperature goes ahove 607 C, try to lower the temperature by measures such as wrap-
ping heat-insulating materials over the detector pipe and adjoining pipes.
Converter
Clamp (optional)
Det
etector | l‘errule (optional)
Flow direction Welding
Process piping
k a Ciasket (accessory)
Figure 4.2 LF494/LF404 Mowmeter piping connections
TOSHIBA
4.3 Piping Connections
(1) Required Pipe Length
6F8ADTT4
It vartous joints are used upstream of the detector outlet, the straight pipe length as
shown in Table 4.1 is required.
Table 4.1 Required straight pipe length on the upstream side
+)
(4) Fully opened sluice valve
д
Delectar
nn
i
L= 3D L = 101}
{1} 90° bent Detector | (5) Other valves (not Fally opened)
i Na — A Detector
КОВ i
$ | |
L
— Lr
(2) Tee
Detector
——
—L |]
Detect
(3) Diffuser ECO
NOTES
L: Required straight pipe length—straight pipe length plus half length of the detector.
D: Nominal bore size (diameter)
1. The length of a reducer, if connected, can be counted as a part of the straight pipe
length.
2. 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 detectar
18
TOSHIBA _ 6F8A0774
(2) Pipe Orientation
The detector may be installed in horizontal, vertical or sloping pipe runs as shown in
Figure 4,3, However, except for horizontal installation, uid should flow from lower to
upper directions. See Figure 4.3.
i —
£ Flow direction
(6)
(a) Horizontal pipe installation
(bh) Vertical pipe installation
Detector 7 (c) Sloping pipe installation
A LC)
Ground surface
—L —— Fr nn ——
— = = — — — | нае = —
Figure 4,3 Detector Piping Orientation
The electrodes should be positioned horizontally against the ground surface in anv piping
Installation. Sec Figure 4.4.
40
—
Cross-section A - A
Ground surface
TOSHIBA
6F8AQT7 74
(3) Flow Direction
Install the delector in accordance with the flow direction arrow on the detector, See Figure 4,5.
lf the actual flow runs opposite to the specified Now direction, the following display and
output appears. . (For bidirectional multi-range measurement, see 10.3, “Mulli-range
Functions,”
" LCD display (optional): Instantancons How rate—indicates negative values,
Totalized flow-—de counts added,
* Output: Current quipuli— 4.0 mA output; Pulse cutput—SNo polses
lor bidirectional range measurement, the flow in opposite direction results in a positive
ourput value. See 10,3, “Mulü-range Functions.”
Flow direction arrow
Figure 4.5 Flow direction arrow on the detector
(4) Preventing an Empty Pipe Condition
Design an upright pipe run (Figure 4.6) or sufficient head pressure (Fig, 4.7) at the
downstream detector outlet if there is a possibility of the detector pipe becoming emptied.
Upright pipe run
Detector
—
Figure 4.6 Detector with an upright pipe run at downstream outlet
Figure 4,7 Detector with sufficient head pressure at downstream outlet
(3) Supporting Pipe
Fix the relevant pipes installed on both sides of the detector by attach fittines, etc. to support
the mpe. 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 it protect
from fund leakage at flange lace (see Figures 4.8 and 4.9),
wm ok =
. не Pipe suppart fittings
Pipe support fittings
2 O
ИИ ОИ ИО A
Figure 4.8 Example of Pipe Fixing Procedure
PELO DELLE OLLE
Figure 4.9 Model Diagram of Ensupported Pipes
TOSHIBA © 6F8A0774
{6)Grounding
The grounding terminal of the [.F494/1.Fd04 Nowmeter should be grounded with 100 ohm
or less ground resistance, Use a heavy copper braid or wire {cross-sectional area 3.5 mm”
timing) Ww ground the terminal and make it as short as possible. The terminal 15 M4 size
and an Md-size crimped ring tug should be used 10 connect the wire 10 the terminal. Avoid a
common ground where carth current may flow. An independent ground is preferable, See
Figure 4.110,
To prevent a two-point grounding, ground the shielded cable on the receiving instrument
side,
Grounding terminal
Grounding wire
Figure 4.10 Grounding Procedure
TOSHIBA
5. Wiring
SFSAO774
A WARNING
BE DO NOT DISCONNECT WHILE CIRCUIT IS LIVE UNLESS
LOCATION 15 KNOWN TO BE NONHAZARDOLUS.
Live part of clectrie circuit ora high temperature department can
cause explosion.
CONT
B Do not live circuits While assembly of all components is not over.
N Protecitve petformance degradation for hazardous location can
cause explosion,
DONT
@ Install per the National Electrical Code for the US (NEC, ANSINFPA 70)
and the Canadian Electrical code for Canada (CEC, CAN/CSA-C22.1).
DO explosion.
Unsuitable conduit connections for hazardous location can cèuse
/\ CAUTION
@ Du not work on piping and wiring
with wet hands.
O
DON'T
Wet hands can cause system
failure,
'W Ground the LF494/LF404 properly.
DO
Operating this product withomt
a grounding can cause system
mailunction.
E Do nof modify or disassemble the
LF494/LF404 unnecessarily,
®
DON'T
Modifying or disassembling
this product can cause elce-
tric shock, malfunction of ar
damage 10 this product,
E Prepare yourself for the cable glands
which could be used in Division 2
hazardous Incstions.
O The apparatus should aot be
provided with the cable glands.
DO
Ш Use the proper cables for wiring of
power and LO).
Using a cable other than the
one specificd may cause sys-
A tem failure or damage and
may break waterproof.
The lahel shown left is placed
near the terminal board for
power input.
Be alerl to electric shock.
ZA
“
TOSHIBA 6F8A0774
Flowmeter accuracy may be affected by the way wiring 15 executed. Proceed with wiring
taking the following precautions:
(1) Select the cable runs away [rom 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 a5 quickly as possible
(3) The converter has a surge-absorbing harrier installed inside. Therefore, do not
conduct a withstand voltage test for the converter, To check the insulation of the
converter, use a vollage of 250 Y de or less.
TOSHIBA 6F8A0774
5.1 Cables
Use thé kind of cables shown in Table 5.1 to wire the converter.
Table 5.1 Cables
Name Cable type Nominal Overall diameter
cross-sectional
| area I _
Power cable Threc-wire sheathed 2 mm? 1110 13 mm
| cable (Note) | _ _
1/0 cable The number of wires [or the output cable depends on the
system specifications. Use a shiclded cable with nominal
cross-sectional area of 1.25 mm? and overall diameter of
11 ta 13 mm.
Note: Use a four-wire cable if the arresters are to be used. Sce Figure 5.1 below.
5.2 External Device Connections and Grounding
The terminal board connections of the 1.F494/LF404 flowmeter are shown in Figure 5.1.
Proceed with wining as described in Section 5.4, “Wiring Procedure.”
If power supply is specified as DC, use LI às positive (+) and L2 as negative (—) terminals.
Instrument Panel:
ordered separately
J с urrent output (4-20 mA des
Flerywmeter . Digital Output 1
E Lules: > Digital Orrpur 2
[a] Iria
— 2 Digital Input (2010 30 Y do
i == 7 | *1 Grounded with 100€ or less
J iii DTO De oLNd resistance.
! В | ШИ | | | _ + rrr J _
lVwie * — --——- — - Li —ao— >? Power Supply
к — +
5.5mm VO cable + 2
or