How it Works
Toshiba
Loading...
LF470
User Manual
39 pgs304.03 Kb0
User Manual
8 pgs330.19 Kb0
Table of contents
Loading...

Toshiba LF470 User Manual

TOSHIBA
6F8A0,8,02
ELECTROMAGNETIC FLOWMETER DETECTOR
MODEL LF470
INSTRUCTION MANUAL
TOSHIBA CORPORATION
TOSHIBA

NOTICE

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:
• Main control systems of nuclear power plants; safety systems in nuclear facilities
• Control systems of medical equipment, including life support machines.
,6,F,8A0.a02.
or other critical control lines directly affecting human safety.

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.
1 -
TOSHIBA

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.
A WARNING
6,F8A08^02,
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

Safety symbols

Indicates a potentially hazardous situation
A CAUTION
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
0
•
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 is indicated by a picture or text inside or next to the triangle.
which, if not avoided, may result in minor to moderate injuries or in property damage.
A
- 2
TOSHIBA

SAFETY PRECAUTIONS (continued)

Safety Precautions for Installation and Wiring

A WARNING
I
Do not use the LF470 in an explosive atmosphere.
Using this product in an explosive atmosphere
can cause explosion.
0
DON’T
A CAUTION
.6,F8A080:2^
■ Turn off mains power before working on pipes.
Working on pipes while power is applied can
DO
■ Install a switch and fuse to isolate the LF470 from mains power.
^ A power can cause electric
QO break-down.
■ Turn off mains power before conducting wiring work.
DO
■ Do not conduct wiring work with bare
hands.
A charge even if power is
V
turned off can still cause
DON’T electric shock.
cause electric shock.
Power supply from mains
shock or circuit
Wiring while power is applied can cause electric shock.
Remaining electric
■ Use an appropriate device to carry and
install the LF470.
If this product falls to the
^K^P ground, injury, or
malfunction of or damage to
DO the product, can be caused.
■ Do not modify or disassemble the
LF470 unnecessarily.
— Modifying or disassembling
this product can cause
vjS/ electric shock,
DON’T malfunction of or damage
to this product.
■ Ground the LF470 independently from power equipment.
Operating this product
without grounding can cause
electric shock or malfunction.
■ Use crimped terminal lugs for the
terminal board and GND terminal.
Loose connections can
^ A cause electric shock. Are
from excessive current or
DO system malfunction.
■ Do not work on piping and wiring with wet hands.
Wet hands may result in
f electric shock.
DON’T
The label shown left is placed near the terminal board for power input.
/ 1 \ (A black border and symbol
on yellow triangle) Be alert to electric shock.
-
3
-
TOSHIBA

SAFETY PRECAUTIONS (continued)

Safety Precautions for Maintenance and Inspection

A CAUTION

6,F,8A0^80^2,

■ Do not touch the LF470 main body
when high temperature fluid is be
ing measured.
The fluid raises the main
1 body temperature and can
DON’T , , ,
■ Do not conduct wiring work with wet
hands.
cause burns when touched.
1 Wet hands may result in
DON’T
■ Do not use a fuse other than the one
specifled.
electric shock.
Using a fuse other than the one specified can cause
( system failure, damage
or malfunction.
DON’T
■ Do not conduct wiring work when
power is applied.
Wiring while power is
1 applied can cause
electric shock.
DON’T
The label shown left is placed near the terminal board for
A power input.
/ (A black border and
^^ symbol on yellow
triangle) Be alert to electric
shock.
Use a rated fuse as follows:
Fuse rating:
• 1A/250V for 100 to 240Vac or llOVdc
• 2A/250V for 24 V dc
Dimensions:
Diameter 5.2 mm x 20 mm
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.
-
4
-
TOSHIBA

Handling Precautions

■ 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:
To put the flowmeter temporarily on the floor, place it carefully with something to support it so that the flowmeter will not topple over.
,6,F,8A0,8:0,2.
• 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.
(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.
-
5
-

TOSHIBA

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:
8A0^8^0^2
• Do not use a transceiver whose output power is more than 5 W.
• Move the anteima 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, it is recommended that you have preventive measures designed and installed on the flowmeter signal receiving side.
- 6
TOSHIBA

Table of Contents

:6,F,8A0,8,0,2,
SAFETY PRECAUTIONS Handling Precautions
............................
1. Product Inspection and Storage •
1.1 Product Inspection ...........................*
1.2 Storage
................................................
2. Overview .........................
3. Names of Parts
4. Installation
4.1 Location
4.2 Mounting Procedure
4.3 Piping Connections
5. Wiring ‘
........
5.1 Cables
..............................
.............. *............. • *
.....................................................................
....................
.........
................................... • • ■
..........
..
.............................................
.........................................................................
5.2 External Device Connections and Grounding
5.3 Wiring Procedure
6. Operation • •
6.1 Preparatory Check •
.......
.......
.......................................... • ■
................
.......
...........................................
• ............
■ 2
• 5
• 8
• 8
■ 8
• 9
10
.
11 12
13 14 18 19
20
22
.
25 25
7. Maintenance and Troubleshooting ••••••
7.1 Maintenance
7.2 Troubleshooting
8. Principle of Operation
9. Specifications
9.1 Flowmeter Specifications
9.2 Type Specification Code
10. Outline Dimensions
......................... *
......
..........................
........................*................
.............*------
.........
...........................................
............... * * *..........
..
■
............................
..........
.................................
.............................. * •
26 26 28 31 32 32 34 35
-
7
TOSHIBA

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 carefuUy and check as follows:
■ Make sure the following items are included in the package.

6,F8A0,8,0,2

1 i I i I
■ Inspect the flowmeter for indications of damage that may have occurred during shipment.
■ Make sure the type and specifications of the flowmeter are in accordance with the
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) Model LF470 Electromagnetic Flowmeter
.............
j
(2) Instruction Manual............................................... 1
ordered specifications.
(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
- 8
TOSHIBA

2. Overview

Features
6f,8,AO,8^0,2,
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:
■ Fluid flow is not obstructed and pressure loss is negligible.
■ The process fluid's temperature, pressure, density or flow conditions has no effect on the accuracy of the flowmeter.
■ 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 coimect to various pipes or tubes by using joints available in the
market.
-
9
-
TOSHIBA
3. Names of Parts
The outline drawing of the LF470 flowmeter is shown in Figure 3.1.
■ Oufline Drawing
Taper pipe thread (R female screw)
6f,8M8V2
Figure 3.1 Outline drawing of LF470 Flowmeter Detector
10 -
TOSHIBA

4. Installation

Safety Precautions for Installation

I
Do not use the LF470 in an explosive atmosphere.
Using this product in an explosive atmosphere
can cause explosion.
®
DON’T
8A0,80,2
A WARNING
A CAUTION
■ Install a svritch and fuse to isolate the LF470 from main power.
Power supply from main power can cause electric shock or circuit
0Q breakdown.
■ Do not modify or disassemble the LF470 unnecessarily.
Modifying or disassembling this product
1 can cause electric shock,
malfunction or damage to
DON’T this product.
■ Do not work on piping and wiring
with wet hands.
'N Wet hands may result in
V electric shock
DON’T
■ Use an appropriate device to carry and install the LF470.
If his product falls to the
ground, injury, or
malfunction of or damage to
PQ the product, can be caused.
■ Ground the LF470 independently from power equipment.
Operating this product without grounding can cause electric
PQ shock or malfunction.
The label shown left is placed near the terminal board for power input.
/ J
\ (A black border and symbol on
yellow triangle)
Be alert to electric shock.
-11 -
Loading...
+ 27 hidden pages
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use