Page 1 6 F 8 A 0 9 2 7 Electromagnetic Flowmeter Converter LF620 Type, LF622 Type 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 LF620 Separate type converter LF622: LF622 Toshiba LF62* series electromagnetic flowmeter converters can be used in combination with various types of electromagnetic flowmeter detectors. For the notes on usage, piping, installation, configuration and maintenance of the combined detector, check the model number of the combined detector and read the instruction manual of the relevant detector.
Page 3 6 F 8 A 0 9 2 7 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.
Page 4 6 F 8 A 0 9 2 7 SAFETY PRECAUTIONS (continued) Safety Precautions for Installation and Wiring CAUTION Do not use the LF620 and LF622 in an Use an appropriate device to carry and install the explosive atmosphere. LF620 and LF622.
Page 5 Warranty and Limitation of Liability 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.
Page 6 6 F 8 A 0 9 2 7 Handling Precautions To obtain the optimum performance from the LF620 and LF622 converter for years of continuous operation, observe the following precautions. (1) Do not store or install the flowmeter in : ・Where there is direct sunlight.
Page 7 6 F 8 A 0 9 2 7 Handling Precautions (continued) (6) The converter housing covers and the cable glands are tightened securely at the time of shipment. Do not remove these covers or glands unless it is necessary to wire new cables or replace old ones.
Page 8: Table Of Contents
Appearance of LF620 Type ......................12 3.1.2 Appearance of LF622 Type ......................13 Construction of the terminal blocks........................ 14 3.2.1 Terminal Block Construction of LF620 Type..................14 Installation ................................15 Notes on Selecting the Installation Location....................16 How to Install..............................17 4.2.1 LF620 Type .............................
Page 9 6 F 8 A 0 9 2 7 Parameter Settings..............................53 Parameter Setting Items..........................53 Check/Change of Parameters ........................54 8.2.1 Menu Configuration Selection Screen ..................... 54 8.2.2 Exciting Current Value........................55 8.2.3 Meter Size ............................56 8.2.4 Exciting Frequency.......................... 58 8.2.5 Flow Direction Setting........................
Page 10 13.2.4 When switch operation is unable ....................146 14. Principle of Operation............................147 15. Specifications ............................... 148 15.1 Specifications .............................. 148 15.2 Model Number Table ........................... 153 16. Outline Drawing..............................154 16.1 LF620 Type ..............................154 16.2 LF622 Type ..............................155 Appendix..................................156 − 9 −...
Page 11: Product Inspection And Storage
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...
Page 12: Overview
6 F 8 A 0 9 2 7 2. Overview This product is a converter used for electric flowmeters that measure the volumetric flow rate of conductive fluid using Faraday's law of electromagnetic induction. You can bring out the functions of the converter when you place it in the converter housing you prepare and use it in combination with a fluid rate measurement detector.
Page 13: Names Of Parts
6 F 8 A 0 9 2 7 3. Names of Parts 3.1 Appearance 3.1.1 Appearance of LF620 Type LF620 Control key Display section Converter case (Control panel) Cable gland for Converter power cable Cable gland for current...
Page 14: Appearance Of Lf622 Type
6 F 8 A 0 9 2 7 3.1.2 Appearance of LF622 Type LF622 Display section Converter installation screw Converter case Control key (Control panel) Cable gland for excitation cable Cable gland for Ground terminal output cable Cable gland for power cable Cable gland for flow rate Cable gland for option...
Page 15: Construction Of The Terminal Blocks
3.2 Construction of the terminal blocks 3.2.1 Terminal Block Construction of LF620 Type When you remove the terminal block cover shown in the figure "Appearance of LF620 and LF622 Type", you can see the converter terminal block as shown below.
Page 16: Installation
6 F 8 A 0 9 2 7 4. Installation Safety Precautions for Installation CAUTION Do not use the LF620 and LF622 in an Use an appropriate device to carry and install explosive atmosphere. the LF620 and LF622. If his product falls to the ground,...
Page 17: Notes On Selecting The Installation Location
6 F 8 A 0 9 2 7 4.1 Notes on Selecting the Installation Location This product is designed for the following environment. ・Indoor and outdoor installation ・Ambient temperature:−20 to ＋60℃ ・Altitude:Up to 2000m ・Humidity range:10 to 90%(no condensation) ・Regulation of power voltage:±10% ・Pollution degree 2 ・Structure: IP67(NEMA 4X) (equivalent)
Page 18: How To Install
4.2.1 LF620 Type The LF620 type converter is used as one united body. The LF620 type is not installed by itself. For how to install the LF620 type converter and a detector, check the type of the combined detector and ...
Page 19 6 F 8 A 0 9 2 7 Unit : mm 4-φ10 hole, or M10 Panel or wall mounting dimensions Figure 4.1 Examples of Installation to Panel and Wall − 18 −...
Page 20 6 F 8 A 0 9 2 7 Unit : mm M10U bolt 50A pipe (2B pipe) etc. Figure 4.2 Example of Pipestand Mounting − 19 −...
Page 21: Wiring
Notes on wiring CAUTION Install a switch and fuse to isolate the Turn off mains power before conducting LF620 and LF622 from mains power. wiring work. Power supply from mains Wiring while power is applied power can cause electric shock can cause electric shock.
Page 22: Cables
6 F 8 A 0 9 2 7 CAUTION (1) Select the cable run location so they are 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.
Page 23: External Device Connections And Grounding
6 F 8 A 0 9 2 7 5.2 External Device Connections and Grounding 5.2.1 LF620 Type The terminal board connections of an integral type converter LF620 are shown in Figure 5.1. Proceed with wiring as described in Section 5.4, “Wiring Procedure.” ...
Page 24: Lf622 Type
6 F 8 A 0 9 2 7 5.2.2 LF622 Type The terminal board connections of separate type converter LF622 are shown in Figure 5.1. Proceed with wiring as described in Section 5.4, “Wiring Procedure.” LF622 Instrument panel : Ordered separately Grounding with 100Ω...
Page 25: Notes On Wiring
• When replacing the flow rate signal cable and excitation cable, also refer to the instruction manual of the relevant detector. Order the detector terminal box cover gasket and cable connection gasket from Toshiba or a Toshiba distributor and be sure to replace the gasket.
Page 26: Wiring
• If the piping material is conductive, connect 100Ω or more • If the piping material is non-conductive, perform the grounding wires to the both ends of the grounding resistance 100Ω or less. piping flange. Figure 5.3 Grounding the LF620 Type − 25 −...
Page 27 6 F 8 A 0 9 2 7 (1) Grounding the LF622 type Ground the external grounding terminal of the detector and the FG terminal of the converter (or external LF622 grounding terminal of the converter) securely (grounding resistance 100Ω or lower). Use grounding wire material of IV wire 5.5mm or more.
Page 28: Terminal Treatment Of Cables
6 F 8 A 0 9 2 7 5.4.2 Terminal Treatment of Cables Follow the procedures below to treat the terminals (at the converter side) of various cables and install the cables to the terminal block. Use appropriate cables based on the description in Section 5.1 "Cables." Crimp a round type insulated crimp-type terminal to the end of the cables.
Page 29 6 F 8 A 0 9 2 7 (3) Connecting the input signal cable: Strip the sheath from the end of each conductor of a 2-core individually shielded cable as shown in Figure LF622 5.9. Twist those shields and cover them with a thermal contraction tube or vinyl tube not to make contact with the case or core wires.
Page 30: Cable Connection
6 F 8 A 0 9 2 7 5.4.3 Cable Connection (1) Connect and install the terminal-treated cables to the terminal block by the following procedure. *Connect the cables to the terminal block securely. A loose connection may cause incorrect measurement.
Page 31 6 F 8 A 0 9 2 7 (2) After connecting the cables to the terminal block, take up the slack of the cables and tighten the tightening nuts. In this case, be careful that if the sheath-stripped portion of the cable comes to the packing, air tightness may not be kept.
Page 32: Digital I/O Connections
6 F 8 A 0 9 2 7 5.5 Digital I/O Connections Digital I/O terminals consist of contact output terminals (DO1 and DO2), voltage signal input terminal (DI), and signal common terminal (COM). Each terminal (DO1, DO2 and DI) is isolated from internal circuits.
Page 33: Operation
6 F 8 A 0 9 2 7 6. Operation CAUTION Do not touch the terminal board when power Do not touch the main body when high is supplied. temperature fluid is being measured. Touching the terminal board The fluid raises the main body when power is supplied can temperature and can cause burns.
Page 34: Zero Adjustment
6 F 8 A 0 9 2 7 Note 1: If the detector pipe is not filled with the fluid to be measured, the flow rate will be indefinite and unable to be measured. Before using the flowmeter, be sure to fill the detector pipe the fluid to be measured.
Page 35: Lcd Display And Controls
Control key (Control panel) Control key (Control panel) Fig. 7.1 Display section of LF620 Fig. 7.1 Display section of LF622 Instructions The operation principle of infrared switch is to irradiate infrared to the front of control panel and detect the reflection from finger when operating.
Page 36 6 F 8 A 0 9 2 7 ● LCD electronically rotatable display The backlit display provides an easy-to-read indication even under poor lighting conditions. Instantaneous flow rates or totalized flow in the measurement mode or configuration parameters in the setting mode can be displayed.
Page 37 6 F 8 A 0 9 2 7 ● Setting switch The control keys allow you to perform converter control and setting, without opening the converter housing. These three controls keys function differently depending on the current display screen. The functions of these control keys are displayed on the display screen.
Page 38: Display Format
6 F 8 A 0 9 2 7 7.2 Display Format In the measurement mode, the measured data is displayed using the menu items set by the Display 1 (DSPL1) and Display 2 (DSPL2). (For display settings, see 8.2.6 "Display Setting.") ・ ...
Page 39 6 F 8 A 0 9 2 7 Note 1: Totalized flow volume and totalized difference flow volume are displayed to the least significant digit of the set count rate. (Example1) When the count rate is 0.0001 m When the measurement object flows through 0.0001(m ), inside counter counts 1.
Page 40 6 F 8 A 0 9 2 7 ・ P ercent display Numeric value･･･Within the range of +125.0% to −125%, - 1 2 5 . 0 displayed to the decimal place of 0.1%. % Unit･･･...
Page 41 6 F 8 A 0 9 2 7 ・ B ar graph display Bar graph can be set only for Display 2. Graph･･･ The measured value is displayed in bar graph. The left side of the graph is RL (Range Low limit) and R ...
Page 42: Basic Operations
6 F 8 A 0 9 2 7 7.3 Basic operations 7.3.1 Mode Change The converter provides the setting mode and calibration mode as well as the measurement mode. To change the mode to the setting mode or to the calibration mode, push the switch.
Page 43 6 F 8 A 0 9 2 7 ○Flow of mode change Note: When the screen is switched, let your * (L) indicates that you can hold down the switch longer. finger off the switch. If you keep pushing, the * <L>...
Page 44 6 F 8 A 0 9 2 7 ○ Pulse output setting mode This mode is used to perform continuous parameter settings (automatic operation) regarding pulse outputs. When these parameters are set, pulse output is ready to send out. ...
Page 45 6 F 8 A 0 9 2 7 ○ Explanation about mode change The converter usually works continuously in the measurement mode. If you want to set parameters or perform calibration or adjustment, you have to go to the setting mode.
Page 46: Setting And Calibration
6 F 8 A 0 9 2 7 ○ Operation timeout function If no operation is made for one minute or more while the converter is in the setting mode, the mode automatically returns to the measurement mode unless the parameters are displayed on the screen.
Page 47 6 F 8 A 0 9 2 7 Switch operation Display example Description A:DETECTOR Pushing from the menu configuration 1 EXC CUR selection screen takes you to the menu 2 SIZE screen. 3 EXC FREQ The cursor is positioned at the function 4 FLOW DIR display ([A: DETECTOR] in this example).
Page 48 6 F 8 A 0 9 2 7 Switch operation Display example Description R1 Push to select the item you want to check or change. 10.0000 The screen changes and the currently set item appears for you to check. m/s ...
Page 49 6 F 8 A 0 9 2 7 Switch operation Display example Description R1 Pushing when data is temporarily set causes the data to be fixed and executed. 5.00000 After the data is set, the cursor disappears, ...
Page 50: Configuration Items Selection Table
6 F 8 A 0 9 2 7 7.4 Configuration Items Selection Table How to check or change each constant of the converter is shown in the table below. Details of each item are described in the setting items (A to R) of Chapter 8, "Parameter Settings." ○...
Page 51 6 F 8 A 0 9 2 7 ○ Detailed configuration When you select "DETAILED" in the menu configuration selection screen, the check/change menu for each constant setting is expanded as shown in the table below. Function Exciting Returns Exciting Meter size Flow...
Page 52: Password Input
6 F 8 A 0 9 2 7 7.5 Password input The converter provides the password function to prohibit some functions that affect the flow measurement from being set or adjusted. For the protected functions, see the menu configuration table on the previous page.
Page 53 6 F 8 A 0 9 2 7 • Limitation of settings and adjustments The items enclosed by thick lines below can only be changed or adjusted (others can only be displayed). However, for items protected by password, they can be changed only when the password input matches.
Page 54: Parameter Settings
6 F 8 A 0 9 2 7 8. Parameter Settings 8.1 Parameter Setting Items To check or change each constant of the converter, first select the desired setting item described in 7.3.2 “Setting and Calibration.” Proceed as follows for settings in the setting mode. ...
Page 55: Check/Change Of Parameters
6 F 8 A 0 9 2 7 8.2 Check/Change of Parameters 8.2.1 Menu Configuration Selection Screen Display example MENU SEL BASIC DETAILED PREVIEW ZERO ADJ PLS SET ESC You can select the kind of menu configuration. For menu items of configuration, see 7.4 "Setting and Calibration Items List." Only the basic parameters are displayed.
Page 56: Exciting Current Value
6 F 8 A 0 9 2 7 8.2.2 Exciting Current Value The exciting current value can be checked/changed by the following procedures. Be sure to match the exciting current value with the value specified for the combined detector. Specifying any other value may cause an error.
Page 57: Meter Size
6 F 8 A 0 9 2 7 Switch operation Display example Description EXC CUR Pushing shows a message to confirm STEP6 the setting is OK or not. 0.2150 If OK, push . If you need to redo the O K ...
Page 58 6 F 8 A 0 9 2 7 Switch operation Display example Description SIZE Repeat this operation until 150mm is STEP4 obtained. 150 When the desired value is obtained, push mm to set the value temporarily. ...
Page 59: Exciting Frequency
6 F 8 A 0 9 2 7 8.2.4 Exciting Frequency You can select an exciting frequency of 6Hz, 12Hz or 24Hz. Since each exciting frequency value has its own characteristics, you should select an appropriate exciting frequency (24Hz is set at shipment. Depending on the characteristics of the detector, a large frequency may result in excitation failure.
Page 60: Flow Direction Setting
6 F 8 A 0 9 2 7 Switch operation Display example Description EXC FREQ You can continue to change the setting item. STEP3 Pushing changes the 12 selection items. : Selected item is scrolled up. ...
Page 61: Display Setting
6 F 8 A 0 9 2 7 Switch operation Display example Description FLOW DIR The currently set flow direction (NORMAL STEP1 in this example) appears. NORMAL Then push * Pushing returns you to the setting ESC ...
Page 62 6 F 8 A 0 9 2 7 Note 1: If COUNT, RANGE, GRAPH or CUSTOM is selected, the display is shown below: COUNT: displays the totalized flow counts (up to 8 digits). RANGE: displays the range number being used for measurement (1 to 4). GPARH: displays the measured value (% value) in bar graph.
Page 63 6 F 8 A 0 9 2 7 Note 2: The second unit (time unit) changes as shown below: /min For Display 2 unit setting, select DSPL2 from the setting menu. ● How to select the display digit setting When you select flow velocity or flow rate (custom unit is included), the screen automatically moves to the display digit setting screen.
Page 64 6 F 8 A 0 9 2 7 For example, if the setting range is 10m/s and display digit setting is 1/100, the measured value will be displayed to the first decimal place. Setting range＝１０．００００ｍ／ｓ One hundredth of Maximum effective digits maximum effective digits Likewise, when the setting range 1m/s and display digit setting is 1/100, the measured value will be...
Page 65: Custom Coefficient Setting
6 F 8 A 0 9 2 7 Note: The setting item for the third unit (flow volume direction code) changes cyclically as shown below. B(bi-directional) F(forward direction fixed) R(reverse direction fixed) C(cyclic) D(difference flow rate) When C(cyclic) is selected, totalizer of forward, reverse and difference are displayed at cycle about 5 seconds.
Page 66: Custom Unit Setting
6 F 8 A 0 9 2 7 Switch operation Display example Description CS VAL Pushing shows a message to confirm STEP4(=END) whether the setting is OK or not. 2.25000 If OK, push . If you need to redo the O K ...
Page 67: Span (Range)
6 F 8 A 0 9 2 7 Switch operation Display example Description CS UNIT Pushing when the cursor is positioned STEP4(=END) on the 7th character shows a message to XXX/ZZZ confirm whether the setting is OK or not. ...
Page 68 6 F 8 A 0 9 2 7 ● Span You can set the span for actual flow rate or flow velocity. (1) Setting range The span can be set within 0.1 m/s to 10 m/s in terms of flow velocity. If you try to set the span outside of this range, either high limit or low limit error message appears: HIGH OVER SPEC (if the set value exceeds 10 m/s)
Page 69 6 F 8 A 0 9 2 7 ● Range hysteresis The hysteresis is the dead band used when multiple ranges are switched. You can set the hysteresis within the range of 0 to 25% in increments of 0.1%. The hysteresis is set only when automatic selection of multiple ranges is used.
Page 70 6 F 8 A 0 9 2 7 Switch operation Display example Description C:RANGE Pushing returns you to the setting 1 R TYPE menu. 2 R1 3 R2 4 R3 5 R4 ESC 6 R HYS 7 EXIT ● Changing the range type The range type should be set before changing the span. The following is an example to change the range type from Single range (SINGLE) to Bidirectional automatic selection of multiple ranges (2F-2R).
Page 71 6 F 8 A 0 9 2 7 Switch operation Description Display example R TYPE When you push , a message appears STEP5(=END) to confirm whether the setting is OK or not. 2F-2R If OK, push . If you want to redo the O K ...
Page 72 6 F 8 A 0 9 2 7 Switch operation Description Display example R2 Push to change the number of the STEP6 digit. 136.000 Push to move the digit. L/min R2 ...
Page 73: Damping Constant
6 F 8 A 0 9 2 7 Switch operation Description Display example R HYS Push to move the cursor to the STEP3 desired digit and push to change the 05.0 number of the digit. ...
Page 74: Rate-Of-Change Limit And Control Limit Time
6 F 8 A 0 9 2 7 Switch operation Display example Description DAMPING The switches at the bottom change. STEP2 are shown.) 02.0 At the same time, the cursor appears. S ...
Page 75 6 F 8 A 0 9 2 7 ● Changing the rate-of-change limit The following is an example to change the rate-of-change limit value from 10.0% to 15.0%. Switch operation Description Display example D:FILTER Select "LIM RATE" from the setting item 1 DAMPING ...
Page 76: Low Cutoff
6 F 8 A 0 9 2 7 8.2.12 Low Cutoff The low cutoff is the function to set the current output to zero forcefully if the flow rate is equal to or less than the low cutoff value set near 0%. The low cutoff value can be set within the range 0 to 10% in increments of 0.1%.
Page 77: Display Low Cutoff
6 F 8 A 0 9 2 7 8.2.13 Display Low Cutoff When low cutoff is set in 8.2.12 “Low Cutoff,” this function determines whether to use the low cutoff processing for displayed values. You can select the display low cutoff setting from the items in the table below. ●...
Page 78: Still Water Zero Adjustment
6 F 8 A 0 9 2 7 Switch operation Description Display example DSPL SET When you push , a message appears STEP4(=END) to confirm whether the setting is OK or not. LOW CUT If OK, push . If you want to redo the O K ...
Page 79: Manual Zero Adjustment
6 F 8 A 0 9 2 7 8.2.15 Manual Zero Adjustment This function is used to perform zero adjustment simply by comparing the output value of the converter with the process value of other instruments without stopping the process of measurement. If zero adjustment described in 8.2.14, “Still Water Zero Adjustment”...
Page 80: 4−20Ma Alarm Output Setting
6 F 8 A 0 9 2 7 Switch operation Display example Description MANUAL Push to move the cursor to the STEP3 desired digit and push to change the -002.5 symbol or number of the digit. ...
Page 81: Output Low Limit Setting
6 F 8 A 0 9 2 7 Switch operation Display example Description ALM 4-20 The currently set value (UNDER 3.0mA in STEP1 this example) appears. UNDER 3mA Then push * Pushing returns you to the setting ...
Page 82: Digital Output
6 F 8 A 0 9 2 7 You can check or change the output low limit as described below. The following is an example to change the output low limit value from 4.0mA to 2.4mA. Switch operation Display example Description G:4-20mA ...
Page 83 6 F 8 A 0 9 2 7 ●Digital output functions Selection items Digital output functions NO USE Not used H ALM High alarm output L ALM Low alarm output HH ALM High-High alarm output LL ALM Low-Low alarm output EMPTY ALM Empty pipe alarm output RNG SIG1...
Page 84: Digital Input
6 F 8 A 0 9 2 7 Switch operation Display example Description DO1 FUNC The switches at the bottom change. STEP2 are shown.) H ALM At the same time, the cursor appears. (The item indicated by the cursor is ...
Page 85 6 F 8 A 0 9 2 7 ●Digital input control signal You can select the detective level of the digital input, as shown below, to control the totalizer and pulse output. (Only when the digital input function is set for totalizer control input) Selection items Digital input function setting Totalizer control signal...
Page 86: Count Rate (Pulse Rate), Pulse Width Setting Mode And Pulse Width
6 F 8 A 0 9 2 7 Switch operation Display example Description DI FUNC When you push , a message appears STEP4(=END) to confirm whether the setting is OK or not. CNT ST/SP If OK, push . If you want to redo the O K ...
Page 87 6 F 8 A 0 9 2 7 ● For pulse width setting mode, you can select either AUTO or MANUAL. Depending on this setting, the pulse width setting varies as shown in the table below: Selection item Pulse width value to be set After the count rate is set, the pulse width is automatically set AUTO to 40% of the period of pulse frequency at 100% output.
Page 88 6 F 8 A 0 9 2 7 You can check or change the count rate and pulse width as described below. The following is an example to change the count rate from 0.01m to 0.9 L. Switch operation Display example Description CNT RATE ...
Page 89: Preset Count
6 F 8 A 0 9 2 7 Note 1: The units of count rate change cyclically as shown below: m³ Mgl = 1,000,000 gal Note 2: After the count rate is set, related parameters are automatically set under the following conditions: (1) Pulse width When the pulse width setting mode is AUTO:...
Page 90 6 F 8 A 0 9 2 7 You can check or change the preset count as described below. The following is an example to change the preset count value from 500 (count) to 1000 (count). Switch operation Description Display example K:PRESET C ...
Page 91: Preset Mode
6 F 8 A 0 9 2 7 8.2.22 Preset Mode The preset mode determines the function when the totalizer reaches the preset count. The present mode can be set from the items shown below. ●Preset mode Selection items Preset mode HOLD Holds the output value.
Page 92: Flow Rate High/Low Alarm And High-High/Low-Low Alarm
6 F 8 A 0 9 2 7 Switch operation Display example Description OUT MODE The switches at the bottom change. STEP2 are shown.) HOLD At the same time, the cursor appears. (The item indicated by the cursor is ...
Page 93 6 F 8 A 0 9 2 7 Switch operation Display example Description H SET The switches at the bottom change. STEP2 are shown.) OFF At the same time, the cursor appears. (The item indicated by the cursor is ...
Page 94: Empty Pipe Alarm Setting
6 F 8 A 0 9 2 7 Switch operation Display example Description H VAL Push to move the cursor to the STEP3 digit you want to change and push +103.0 to change the number of the digit. ...
Page 95: Self Diagnosis On/Off Setting
6 F 8 A 0 9 2 7 Switch operation Display example Description EMPTY The current setting (OFF in this example) STEP1 appears. OFF Then push * Pushing returns you to the menu ESC ...
Page 96: Converter Alarm
6 F 8 A 0 9 2 7 ●Changing the self-diagnosis function setting The following is an example to change the self-diagnosis setting from OFF to ON. Switch operation Description Display example N:SELF CHK Select "SELF CHK" from the setting item 1 EMPTY ...
Page 97: Fixed Value Output
6 F 8 A 0 9 2 7 ●Changing the converter alarm function The following is an example to change the converter alarm function from WITH EMP to CONV ONLY. Switch operation Description Display example N:SELF CHK Select "CONV ALM" from the setting item 1 EMPTY ...
Page 98 6 F 8 A 0 9 2 7 Operation when fixed output is set to ON Current output Output is the fixed current output value. Pulse output Output is the fixed pulse rate pulse signal. Digital output other than Status in hold pulse output Display...
Page 99 6 F 8 A 0 9 2 7 Switch operation Display example Description FIX SET When you push , a message appears STEP4 to confirm whether the setting is OK or not. ON If OK, push . If you want to redo the O K ...
Page 100: Password Setting
6 F 8 A 0 9 2 7 Note 1: If you try to set a value outside of the range, 2.4mA or 24mA (in the case of fixed current output) or 10000pps (in the case of fixed pulse output) will be forcibly set. Note 2: The pulse width set in Section 8.2.20 is used for fixed pulse output.
Page 101 6 F 8 A 0 9 2 7 * However, if a wrong password is entered when the mode is changed from the measuring mode to the setting mode, *** appears and the password cannot be checked. Switch operation Display example Description PASSWORD ...
Page 102: Lcd Adjustment
6 F 8 A 0 9 2 7 8.2.29 LCD Adjustment This section describes how to set the LCD density adjustment value for the converter display. The LCD density can be set in 5 levels. LCD density adjustment level 1 ...
Page 103: Switch Position Setting
6 F 8 A 0 9 2 7 8.2.30 Switch Position Setting The switch position of the converter display can be set. The position setting of the switch enables the display remains the same in orientation, regardless of which direction relative to the piping the converter is installed.
Page 104: Communication Setting
6 F 8 A 0 9 2 7 The following is an example to change the switch position setting from BOTTOM to TOP. Switch operation Description Display example P:OTHERS Select "SW POSN" from the setting item 1 PASSWORD selection menu. 2 LCD ADJ ...
Page 105: Parameter Initial Settings List
6 F 8 A 0 9 2 7 8.3 Parameter initial settings list Unless otherwise specified, the default values for each parameter shown below are set when shipped from the factory: Parameter names Default value(SI unit) Default value(English unit) Excitation frequency Value(*1) Value(*1)
Page 106 6 F 8 A 0 9 2 7 When parameter value was appointed in order, parameter value may be different from list. Setting values for each meter size Range 1 (SI unit) Range 1 (English unit) Count rate Meter Size Freq (mm)
Page 107: Calibration
6 F 8 A 0 9 2 7 9. Calibration 9.1 Calibration Items When you check or calibrate the converter or check the excitation current, you have to change the mode to the calibration mode. You can check or change the zero and span of the converter and the excitation current value as described below.
Page 108: Converter Check / Calibration
6 F 8 A 0 9 2 7 9.2 Converter Check / Calibration 9.2.1 0 % Flow Rate Calibration (Zero Calibration) Using the converter’s internal calibration circuit, 0% flow rate calibration (hereafter called zero calibration) can be performed. ●Zero point check / calibration Switch operation Display example Description...
Page 109: Flow Rate Calibration
6 F 8 A 0 9 2 7 9.2.2 50 % Flow Rate Calibration Using the converter’s internal calibration circuit, 50% flow rate calibration can be performed. For calibration procedure, see the calibration procedure for 0% flow rate. (For 50% flow rate calibration, select "CAL 50"...
Page 110: Functional Description
6 F 8 A 0 9 2 7 10. Functional Description The LF62* Series Electromagnetic Flowmeter is equipped with two contact output terminals (digital output terminals (DO1, DO2)) and one external input terminal (digital input (DI)), enabling you to use various functions, such as pulse output and alarm output.
Page 111: Digital I/O Specifications
6 F 8 A 0 9 2 7 10.1 Digital I/O Specifications The specifications of the digital I/O terminals for the converter for electromagnetic flowmeter: LF62* are as follows: Digital Output 1(DO1 ) Output type: Transistor open collector Number of outputs: Capacity: 30 V dc, 200 mA maximum Digital Output 2(DO2 )
Page 112: Totalizer And Pulse Output
6 F 8 A 0 9 2 7 10.2 Totalizer and Pulse Output To use the totalizer and pulse output for external use, proceed as follows. Count rate and Pulse Width Setting Set the flow volume per count (pulse) (count rate) and the pulse width. See 8.2.20, “Count rate, Pulse Width Setting Mode and Pulse Width.”...
Page 113 6 F 8 A 0 9 2 7 Note 1: Example of count rate setting range: The count rate can be set within the range from the minimum value (36000000 pulse/h) to the maximum value (3.6 pulse/h). (Example) In the case of range 3600m /h (1m /s), Minimum value (for 36000000 pulse/h):...
Page 114 6 F 8 A 0 9 2 7 Totalizer Operation ●Operation using the operation switches You can start, stop or clear the totalizer as described below. Switch operation Display example Description PUSH SW Mode change screen CNT: CNT CTRL SET: SET MODE ...
Page 115 6 F 8 A 0 9 2 7 Note 1:Since the flow volume direction code is B (Bidirectional forward/reverse automatic selection), •When you select forward/reverse multi-range, forward direction totalized value (count value) is displayed for operation in the forward direction range, and reverse direction totalized value (count value) is displayed for operation in reverse direction range.
Page 116: Multi-Range Function
6 F 8 A 0 9 2 7 10.3 Multi-range Function Four types of multiple ranges shown below can be selected by setting the range type: (1) Unidirectional flow, automatic selection of multiple ranges (2) Bidirectional flows, automatic selection of multiple ranges (3) Unidirectional flow, multiple ranges selected by external signal (4) Bidirectional flows, multiple ranges selected by external signal Proceed as follows to use the multi-range function.
Page 117 6 F 8 A 0 9 2 7 Output performance of multi-range functions (1) Automatic selection of unidirectional flow multi-range with an internal signal Output (%) Range 1 20mA Range 4 Range 3 Range 2 Hysteresis (0~25%) Reverse 0 Forward direction Flow rate direction Range output No.1 Range output No.2 ・...
Page 118 6 F 8 A 0 9 2 7 (2) Automatic selection of bidirectional flows multi-range with an internal signal output (%) Range 3 Range 1 20mA Range 2 Range 4 Hysteresis Hysteresis Reverse direction 0 Forward direction Flow rate Range output No.1...
Page 119 6 F 8 A 0 9 2 7 (3) Remote selection of unidirectional flows multi-range with an external signal Output (%) Range 2 Range 1 Reverse direction Forward direction Flow rate External signal H level input L level input Range output No.1 ...
Page 120 6 F 8 A 0 9 2 7 (4) Remote selection of bidirectional flows multi-range with an external signal Output (%) Range 3 Range 1 Range 2 Range 4 ↓ ↓ Reverse direction Forward direction Flow rate External signal L level H level...
Page 121: Flow Rate High/Low, High-High/Low-Low Alarm Output
6 F 8 A 0 9 2 7 10.4 Flow Rate High/Low, High-High/Low-Low Alarm Output To use the flow rate high/low alarm or high-high/low-low alarm output, follow the procedure below. High / Low alarm setting Refer to 8.2.23, “Flow Rate High/Low Alarm and High-High/Low-Low Alarm”...
Page 122 6 F 8 A 0 9 2 7 High and Low Limit Alarm Output Performance (Same as for High High/Low Low limit Alarm Output) • Single range performance Output (%) High limit value Hysteresis 2.5% Hysteresis 2.5% Low limit value Alarm output Alarm output Alarm output...
Page 123: Preset Count Function
6 F 8 A 0 9 2 7 10.5 Preset Count Function When the totalizer count reaches the preset count value, the converter outputs a contact signal. Proceed as follows to use the preset count function. Totalizer setting Refer to 10.2 “Totalizer and Pulse Output” to set necessary settings for totalizer.
Page 124 6 F 8 A 0 9 2 7 Preset count output performance (1) The following is an example for totalizer flow counts output in which the totalizer is reset with an external signal (when preset output status level hold mode is set (contact ON)). H level input Counter Reset/Start signal (DI detective level is H).
Page 125 6 F 8 A 0 9 2 7 (2) The following is an example for totalizer flow counts output in which the totalizer is reset with an external signal (when one-shot pulse output mode is set). Counter Reset/Start signal H level input (DI detective level is L).
Page 126 6 F 8 A 0 9 2 7 (3) The following is an example for one-shot pulse output. Setting preset count:100 Totalizer flow counts Preset point output For it takes the time set pulse width from the output goes OFF Input/Output signal time chart * Preset output goes ON when the count value exceeds the preset value of 100 and the preset output goes OFF when its width reaches the set pulse width.
Page 127 6 F 8 A 0 9 2 7 Note: When the one-shot pulse output function is selected, if its pulse width is large compared with the update period of the preset value. The output stays ON. To make sure to output as one-shot pulse, set the preset value reach interval to be 2 signals or more of the pulse width setting value.
Page 128: Remote Zero Adjustment
6 F 8 A 0 9 2 7 10.6 Remote Zero Adjustment On-stream zero adjustment in a zero flow rate condition can be started with an external signal. To do this, set DI as a zero adjustment start signal. See 8.2.19, “Digital I/O” [Signal Input Timing] H level Zero adjustment...
Page 129: Converter Failure Alarm
6 F 8 A 0 9 2 7 10.8 Converter Failure Alarm If any one of the following errors occurs in a self-diagnosis sequence, the converter issues an alarm using a contact output. ●Self-diagnosis errors Self-diagnosis errors (LCD display) Error items ROM ERROR ...
Page 130: Multiple Range High/Low Limit Alarm Function
6 F 8 A 0 9 2 7 10.9 Multiple range high/low limit alarm function The procedure to use multiple range high/low limit alarm is shown below. Range setting ・Set the range in accordance with 8.2.9 Span (range) in the following order. 1.
Page 131 6 F 8 A 0 9 2 7 Multiple range high/low limit alarm output Flow rate High limit Low limit High-high limit Low-low limit Time Multiple range High limit alarm output Alarm output ON Alarm output ON Alarm output ON Multiple range Low limit alarm output Alarm output ON...
Page 132: Custom Unit Function
6 F 8 A 0 9 2 7 10.10 Custom unit function (1) Display of flow rate The procedure to display flow rate by the custom unit is shown below. Example : In the case of custom unit [dL(deciliter)/min]. Custom coefficient setting ・Set the custom coefficient in accordance with 8.2.7 “Custom Coefficient Setting”.
Page 133 6 F 8 A 0 9 2 7 (2) Span setting Setting of 8.2.7 “Custom Coefficient Setting” and 8.2.8 “Custom Unit Setting” is applied to the custom coefficient and unit same as (1)Display of flow rate. Example : In the case of custom unit [dL(deciliter)/min]. Custom coefficient setting ・Set the custom coefficient in accordance with 8.2.7 “Custom Coefficient Setting”.
Page 134 6 F 8 A 0 9 2 7 Note1 : Even if the custom unit is selected, the current output does not change unless the span value is changed. Display example Description R1 In the case of span value = 2.00000 m /min ...
Page 135: Communications Function
6 F 8 A 0 9 2 7 11. Communications Function The LF62* Series Electromagnetic Flowmeter uses the HART*1 protocol to transmit digital signals over the 4-20mA output line. The AF900 hand-held terminal is used to communicate with the LF62* using the HART protocol.
Page 136: Procedure For Communications With Hht
6 F 8 A 0 9 2 7 Converter terminal block HTT connection cable and clips Figure 11.2 Connections to the Converter Unit 11.2 Procedure for Communications with HHT This section describes the HHT basic operation procedure for communications between the flowmeter and HHT.
Page 137: Notes On Communications
6 F 8 A 0 9 2 7 11.3 Notes on Communications ● Current output load (1) Load resistance: 240 to 750 Ω (including the communications line resistance) (2) Load capacitance: 0.25μF maximum (including the communications line capacitance) (3) Load inductance:4mH maximum (including the communications line inductance) (The maximum cable length is approx.
Page 138: Self Diagnosis And Alarms
6 F 8 A 0 9 2 7 12. Self Diagnosis and Alarms 12.1 Self-Diagnosis The converter has a self-diagnosis function to detect errors, such as setting error, I/O error or converter hardware failure, and shows the resulting error or alarm messages on Display 2 of the screen or on the hand-held terminal (HHT) through communications.
Page 139 6 F 8 A 0 9 2 7 ● High/low alarm, high-high/low-low alarm, empty pipe alarm One of the following messages appears if the flow rate reading goes out of the set range or an empty alarm is generated. If the high or low limit alarm ON/OFF status is set to OFF, its alarm function (high or low) is disabled.
Page 140 ROM ERROR ROM error printed-circuit board must be RAM ERROR RAM error repaired or replaced. Contact Toshiba’s salesperson in PARAMETER System parameter error in the memory charge or distributor in your area. FAILURE EXC CUR Connect the excitation cables Excitation cables are not connected.
Page 141: Output Status For Errors And Alarms
6 F 8 A 0 9 2 7 12.2 Output Status for Errors and Alarms Error indication Measured value Current output Totalization Remarks indication (4-20mA) pulse output ROM ERROR After power-up, (Note 3) Stopped − (Note 1) no measurement starts. After power-up, (Note 3) Stopped...
Page 142: Maintenance And Troubleshooting
LCD's display density. If the display is still not improved, the display unit comes to the end of its life. Please replace the display unit with a new one. In order to use the display unit stably for a long time, it is preferable to replace it early. For inspection and replacement, please contact your nearest Toshiba representative.
Page 143 9 to 10 years if the ambient temperature is 40°C, and 5 to 6 years if it is 50° C. To extend the life of the flowmeter, we recommend you replace the power supply unit early. Contact your nearest Toshiba representative for a flowmeter inspection or unit replacement. Product disposal The main body or parts of the converter for electromagnetic flowmeter l: LF62* must be disposed of, according to the rules and regulations of your local government.
Page 144: Troubleshooting
Is the flow direction Refer to Chapter 4, match with the arrow “Mounting Procedure.” mark on the detector? Contact your nearest Toshiba representative. Note When meter size is under 80mm (3inch), measurement value of 'Mgl/s' unit is not displayed because value is too small.
Page 145: Flow Rate Indication Is Not Correct
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. − 144 −...
Page 146: Flow Rate Indication Is Not Stable
Note 1: If the detector tube is not filled with Contact your nearest Toshiba operating fluid, the flow is indefinite and representative. measurement is impossible. Be sure to fill the detector tube with operating fluid before starting measurement.
Page 147: When Switch Operation Is Unable
Operate the EMF converter blocking Is there any reflecting object such the light from the reflecting object by as metal plate placed opposing to standing in-between the control panel the control panel? and the reflecting object. Contact your nearest Toshiba representative. − 146 −...
Page 148: Principle Of Operation
D Figure 14.1 Principle of Operation The LF620 and LF622 electromagnetic flowmeter uses the square-wave excitation method, which provides long-term stable operation. With square-wave excitation, the LF620 and LF622 offers reliable measurement without being affected by electrostatic or electromagnetic interference, or electrochemical polarization between the electrodes and the fluid to be measured.
Page 149: Specifications
6 F 8 A 0 9 2 7 15. Specifications 15.1 Specifications General Specifications Measuring range: (measuring range by flow rate conversion) Combined detector S m a l l / M i d d l e m e t e r s i z e ( 1 5〜 4 5 0 m m ) L F 4 1 0 , L F 4 3 0 , L F 4 9 0 , L F 6 5 0 , G F 6 3 * t y p e 0-0.3m/s to 0-10m/s Measuring range (A range of 0-0.1m/s to 0-0.3m/s can be dealt with by an option specified at order time.)
Page 150 50 〜100 % ±0.8 % FS ±0.8 % of rate （Note）Accuracy under the basic operation conditions with Toshiba calibration facility) Conductivity: 3μS/cm or more (Combined detector : LF650 ) 5μS/cm or more (Combined detector : LF410, LF43*, LF450, LF470, LF490, GF63* ) Ambient temperature: -20 to +60℃...
Page 151 6 F 8 A 0 9 2 7 ・ Zero adjustment input: Start still water zero adjustment. Output Current output: 4 to 20mAdc (load resistance 750Ω or less) Digital output 1: Output type: Transistor open collector Capacity: 30Vdc, Max 200mA Number of output points: Digital output 2: Output type:...
Page 152 6 F 8 A 0 9 2 7 Coating Acrylic resin-baked coating, metallic-gray colored Cable connection port G(PF) 1/2 thread (standard) Cable glands provided. ･ Applicable cable diameter: 9 to 14 mm ･ Material: Nylon 66 Surge arresters Surge arresters are installed in the power supply and current signal output circuit. −...
Page 153 6 F 8 A 0 9 2 7 15.2 Model Number Table Converter Model Number Table Model number Specification code Contents 1 2 3 4 5 10 11 12 13 14 L F 6 2 Electromagnetic flowmeter converter Combined type ○...
Page 154: Model Number Table
Weight : Approx. 2.0 kg unit: mm ( 2 1 2 ) ( 3 6 ) 1 7 6 Detector dimensions: Check the dimensions of the detector with the instruction manual of the combined detector. Figure 16.1 Outline of LF620 Type − 153 −...
Page 155: Outline Drawing
6 F 8 A 0 9 2 7 16.2 LF622 Type Weight : Approx. 3.0 kg (including the installation plate). unit: mm 1 3 6 1 2 3 ...
Page 156: Lf622 Type
6 F 8 A 0 9 2 7 Appendix Factory default standard value table Parameter names Default value(SI unit) Default value(English unit) Changed value Excitation frequency Value(*1) Value(*1) Flow direction NORMAL NORMAL Display 1 gal/min Display 2 COUNT B Display digit setting 1/1000 1/1000...
Page 157: Appendix
6 F 8 A 0 9 2 7 When parameter value was appointed in order, parameter value may be different from list. Setting value in each size Range 1 (SI unit) Range 1 (English unit) Count rate Meter Size Freq (mm) (m3/h)
Page 158 6 F 8 A 0 9 2 7 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 （） −...
Page 160 ...

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