Toshiba LF470 User Manual

TOSHIBA

6F8A0,8,02

ELECTROMAGNETIC FLOWMETER DETECTOR

MODEL LF470

INSTRUCTION MANUAL

TOSHIBA CORPORATION

TOSHIBA	,6,F,8A0.a02.

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:

•Main control systems of nuclear power plants; safety systems in nuclear facilities or other critical control lines directly affecting human safety.

•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.

1 -

TOSHIBA

6,F8A08^02,

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

0	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.
	Thethe circle.mandatory action is indicated by a picture or text inside or next to
A	Indicates a potential hazard. The potentially hazardous situation is
	indicated by a picture or text inside or next to the triangle.

- 2

TOSHIBA

.6,F8A080:2^

SAFETY PRECAUTIONS (continued)

Safety Precautions for Installation and Wiring

A WARNING

IDo not use the LF470 in an explosive atmosphere.

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

-

3

-

TOSHIBA	6,F,8A0^80^2,

SAFETY PRECAUTIONS (continued)

Safety Precautions for Maintenance and Inspection

A CAUTION

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

-

4

-

TOSHIBA

,6,F,8A0,8:0,2.

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:

•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.

-

5

-

TOSHIBA

8A0^8^0^2

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 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	:6,F,8A0,8,0,2,

Table of Contents

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

-7

TOSHIBA

6,F8A0,8,0,2

1 i

I i I

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.

(1)Model LF470 Electromagnetic Flowmeter............. j

(2)Instruction Manual............................................... 1

■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 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

- 8

TOSHIBA

6f,8,AO,8^0,2,

2. Overview

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.

Features

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

6f,8M8V2

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)

Figure 3.1 Outline drawing of LF470 Flowmeter Detector

1 0 -

TOSHIBA

8A0,80,2

4. Installation

Safety Precautions for Installation

A WARNING

IDo not use the LF470 in an explosive atmosphere.

	®	Using this product in an explosive atmosphere
		can cause explosion.
	DON’T
		A CAUTION
	■ Install a svritch and fuse to isolate		■ 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
		power can cause electric	ground, injury, or
		shock or circuit	malfunction of or damage to
	0Q breakdown.		PQ the product, can be caused.
	■ Do not modify or disassemble the		■ Ground the LF470 independently
	LF470 unnecessarily.		from power equipment.
		Modifying or
		disassembling this product	Operating this product without
	1 can cause electric shock,
			grounding can cause electric
		malfunction or damage to
			PQ shock or malfunction.
	DON’T this product.
	■ Do not work on piping and wiring		The label shown left is placed
	with wet hands.		near the terminal board for
	'N Wet hands may result in		power input.
			/ J \ (A black border and symbol on
	V electric shock
			yellow triangle)
	DON’T		Be alert to electric shock.

- 1 1 -