Toshiba LF470 Instruction Manual
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Toshiba LF470 Instruction Manual

Toshiba LF470 Instruction Manual

Electromagnetic flowmeter detector
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ELECTROMAGNETIC FLOWMETER DETECTOR
NOTES
Before using the equipment, please read this manual carefully and understand the
contents, and then use the equipment correctly.
• NEVER attempt to operate the equipment in any ways that are not described in this
instruction manual.
• After reading this manual, store it with care in a place where it can be referred to
whenever needed.
• Please be sure that this manual is delivered to the personnel who will use this product.
MODEL LF470
INSTRUCTION MANUAL
６Ｆ８Ａ０９１４

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  • Page 1 ６Ｆ８Ａ０９１４ ELECTROMAGNETIC FLOWMETER DETECTOR MODEL LF470 INSTRUCTION MANUAL NOTES Before using the equipment, please read this manual carefully and understand the contents, and then use the equipment correctly. • NEVER attempt to operate the equipment in any ways that are not described in this instruction manual.
  • Page 2 ６Ｆ８Ａ０９１４ NOTICE We thank you very much for your purchase of our LF470 series electromagnetic flowmeter detector. Separate type detector LF470 This instruction manual describes the notes on using an electromagnetic flowmeter detector, installa- tion, configuration and maintenance. It is intended for the personnel in charge of installation, opera- tion and maintenance.

  • Page 3: Safety Precautions

    ６Ｆ８Ａ０９１４ 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.
  • Page 4 ６Ｆ８Ａ０９１４ SAFETY PRECAUTIONS (continued) Safety Precautions for Installation and Wiring WARNING Do not use the LF470 in an explosive atmosphere. Using this product in an explosive atmosphere can cause explosion. DON’T CAUTION Turn off mains power before Use an appropriate device to carry and working on pipes.

  • Page 5: Usage Limitation

    Warranty and Limitation of Liability Toshiba does not accept liability for any damage or loss, material or personal, caused as a direct or indi- rect 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.

  • Page 6: Handling Precautions

    ６Ｆ８Ａ０９１４ Handling Precautions To obtain the optimum performance from the LF470 flowmeter for years of continuous operation, ob- serve 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.

  • Page 7: Table Of Contents

    ６Ｆ８Ａ０９１４ Table of Contents SAFETY PRECAUTIONS ········································································································· 2 Handling Precautions ·················································································································· 5 1. Product Inspection and Storage ·························································································· 7 1.1 Product Inspection ··········································································································· 7 1.2 Storage ···························································································································· 7 2. Overview ······························································································································· 8 3. Names of Parts ······················································································································ 9 4. Installation ·························································································································· 10 4.1 Location ·························································································································...

  • Page 8: Product Inspection And Storage

    (3) cable connection (Note1) ............ Note1: In case of that the 7th column at specification code of the LF470 is D or E, and the 13th column at that is A, C or D; assembled converter is LF602, LF612 or LF230, and diameter of the cable is 7mm, the cable connections are included.

  • Page 9: Overview

    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.

  • Page 10: Names Of Parts

    ６Ｆ８Ａ０９１４ 3. Names of Parts The outline drawing of the LF470 flowmeter is shown in Figure 3.1. 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...

  • Page 11: Installation

    Install a switch and fuse to isolate the Do not modify or disassemble the LF470 unnec- LF470 from main power. essarily. Power supply from mains power Modifying or disassembling this product...

  • Page 12: Location

    Design piping so that the detector pipe is always filled with fluid, whether the fluid is flowing or not. The LF470 detector has no adjustable piping mechanism. Install an adjustable short pipe where needed.

  • Page 13: Mounting Procedure

    (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.

  • Page 14: Piping Connections

    ６Ｆ８Ａ０９１４ 4.3 Piping Connections (1) Required Upstream Straight 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 Detector...
  • Page 15 ６Ｆ８Ａ０９１４ (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 direc- tions. If no air bubble, Vertical down flow application are acceptable under pressured piping conditions.
  • Page 16 ６Ｆ８Ａ０９１４ (3) Flow Direction Install the detector in accordance with the flow direction arrow on the detector. See Figure 4.4. over 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.
  • Page 17 Pipe support fittings Pipe support Adjust the center of pipe to Mounting board(option) the position that electrodes of LF470. Figure 4.7 Example of Pipe Fixing Procedure Not adjust the center of pipe to the position that electrodes of LF470. Figure 4.8 Model Diagram of Unsupported Pipes...

  • Page 18: Wiring

    ６Ｆ８Ａ０９１４ 5. Wiring CAUTION Do not work on piping and wiring Ground the LF470 properly. with wet hands. Wet hands can cause Operating this product system failure. without a grounding can cause system DON’T malfunction. Do not modify or disassemble the LF470 unnecessarily.

  • Page 19: Cables

    ６Ｆ８Ａ０９１４ 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 Length Nominal Overall Name Cable type cross-sectional area diameter Excitation Three-core chloroprene cable cabtyre cable ( Rubber 0.5 mm²...

  • Page 20: External Device Connections And Grounding

    ６Ｆ８Ａ０９１４ 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 (1) The input signal cable and excitation cable are attached to the detector. Be sure to use the at- tached cable, check the specification of the detector.
  • Page 21 Converter terminal Twist the shields External grounding terminal Input signal 100 ohm or less ground cable resistance Excitation Twist the cable shields LF470 Grounding Detector terminal terminal Figure 5.2 Wiring between the detector and the converter － 20 －...

  • Page 22: Wiring Procedure

    ６Ｆ８Ａ０９１４ 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 CAUTION Do not conduct wiring work when Do not work on piping and wiring power is applied. with wet hands.
  • Page 23 ６Ｆ８Ａ０９１４ ● Notes on signal cable shield processing work When stripping an external sheath, intermediate and insulated sheath, be careful not to scratch or cut the internal conductors and shield mesh. Do not disjoint the shield mesh but treat it as shown in Figure 5.4.

  • Page 24: Cable Connections

    Notice See the 7th and 13th column at specification code of the LF470, if the 7th code is D or E and 13th code is A, C or D; assembled converter is LF602, LF612 or LF230, and diameter of the cable is 7mm, the cable connections that suitable for 7mm di- ameter of cable are included in package with the flowmeter and the manual.

  • Page 25: Operation

    ６Ｆ８Ａ０９１４ 6. Operation CAUTION 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.

  • Page 26: Maintenance And Troubleshooting

    The pipe wall is never scratched when cleaning. *Toshiba recommends to clean inside pipe periodically when this condition will become easily. *It is better to choose the suitable diameter which becomes more than 3 m/s as its flow ve- locity to avoid this condition generally.
  • Page 27 ６Ｆ８Ａ０９１４ 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.

  • Page 28: Troubleshooting

    ６Ｆ８Ａ０９１４ 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 symptoms (1) to (3). If you cannot solve the problem, contact your nearest Toshiba representative.
  • Page 29 Is accuracy calculated as follows? Calculate as shown on the left. (Measured flow rate)-(Actual flow rate) × 100% Actual flow rate Contact your nearest Toshiba representative. － 28 －...
  • Page 30 Is the fluid carrying does not carry bubbles. bubbles? Install the flowmeter away Is there high-voltage or large from equipment producing current cable or equipment electromagnetic or near the flowmeter? electro- static interference. Contact your nearest Toshiba representative. － 29 －...

  • Page 31: Principle Of Operation

    Figure 8.1 Principle of Operation The LF470 electromagnetic flowmeter uses the square-wave excitation method, which provides long-term stable operation. With square-wave excitation, the LF470 offers reliable measurement without being af- fected by electrostatic or electromagnetic interference, or electrochemical polarization between the elec- trodes and the fluid to be measured.

  • Page 32: Specifications

    ６Ｆ８Ａ０９１４ 9. Specifications The flowmeter specifications and the type specification code used when ordering the flowmeter are de- scribed in this chapter. 9.1 Flowmeter Specifications Overall Specifications Meter size: 1/10”(2.5mm), 1/6”(4mm), 1/4”(6mm) Measurement range in terms of flow velocity: 0–1.0 ft/s to 0–32.8 ft/s (0–0.3 m/s to 0–10 m/s) System accuracy: See the following table.
  • Page 33 ６Ｆ８Ａ０９１４ Principal materials: Measurement tube — Alumina ceramics Electrodes — Platinum See Table 9.3 Type Specification Code for optional materials and other related information. Pipe connection port: Standard — 316 stainless steel Option — Ti (titanium), Polyvinyl chloride (shock-resistant)+ Ta (Tantalum) for grounding plate, Polyvinyl chloride (shock-resistant)+ Pt-Ir grounding plate, Hastelloy C (Equivalent) Coating:...

  • Page 34: Type Specification Code

    5m or more (extension dia. 12mm+Scotch cast connection) Coating Phthalic acid resin coating pearl-gray colored (standard) Other Note1: Consult Toshiba before ordering when choose materials at the wetting parts. Note2: Total cable length must be within 30m. － 33 －...

  • Page 35: Outline Dimensions

    2.20 (56) Note1 2.76 (70) 1.18 (30) Note1: In case of that the 8th column at specification code of the LF470 is D; pipe connection port is Rc(PT)1/2, this dimension is 3.07” (78mm). unit: inch (mm) Figure 10.1 LF470 Outline Dimension...
  • Page 36 ６Ｆ８Ａ０９１４ 3.39 (86) 2.95 (75) 1.18 (30) 4-φ0.24 (φ6) holes 2-φ0.24 (φ6) holes (for fitting in LF470) (for installation） unit: inch (mm) Figure 10.2 Mounting plate (option) － 35 －...
  • Page 37 ６Ｆ８Ａ０９１４ Write down the address and phone number of the distributor from which you purchased this product, the product code, SER.NO. and so on. Distributor Address Name Phone number （ ） － Product code SER.NO. － 36 －...
  • Page 38 ６Ｆ８Ａ０９０８...

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