6F8A0917 Electromagnetic Flowmeter Converter LF232 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. • 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.
6F8A0917 NOTICE Thank you very much for your purchase of our LF232 Type Electromagnetic Flowmeter Converter. This instruction manual describes about the precautions required when using the LF232 converter, installation, configuration and maintenance. It is intended for the personnel in charge of the installation, operation and maintenance. To use this product properly and safely, read this manual carefully before using this product.
6F8A0917 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.
6F8A0917 SAFETY PRECAUTIONS (continued) Safety Precautions for Installation and Wiring Do not use the LF232 in an explosive atmosphere. DON’T Use an appropriate device to carry and install the LF232. Using this product in an explosive atmosphere can cause explosion. DO Install a switch and fuse to isolate the LF232 from mains power. DO Do not modify or disassemble the LF232 unnecessarily. Power supply from mains power can cause electric shock or circuit break-down.
6F8A0917 SAFETY PRECAUTIONS (continued) Safety Precautions for Maintenance and Inspection Do not touch the LF232 main body when high temperature fluid is being measured. DON’T Do not conduct wiring work when power is applied. Wiring while power is applied can cause electric shock. The fluid raises the main body temperature and can cause burns when touched. DON’T Do not conduct wiring work with wet hands. DON’T The label shown left is placed near the terminal board for power input.
F8A0917 Handling Precautions To obtain the optimum performance from the LF232 converter 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. If the control keys (infrared switches) are exposed to direct sunlight, they may not function correctly. • Places where there is snow and ice Infrared switches may not function correctly.
6F8A0917 Handling Precautions (continued) (6) The converter housing covers and the cable connections are tightened securely at the time of shipment. Do not remove these covers or connections unless it is necessary to wire new cables or replace old ones. Otherwise, gradual deterioration of circuit isolation or damage to this product can be caused. (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.
6F8A0917 Table of Contents 1. Product Inspection and Storage···················································································10 1.1 Product Inspection······································································································10 1.2 Storage ·······················································································································10 2.
6F8A0917 8. Parameter Settings / Adjustment ·················································································55 8.1 Parameter Setting Items·····························································································55 8.2 Parameters Check / Change ······················································································56 8.2.1 Exciting Current Value ···················································································56 8.2.
6F8A0917 10.4 Flow Rate High/Low Limit Alarm Output···································································138 10.5 Fluid Empty Alarm Output·························································································141 10.6 Preset Counter Output Function···············································································142 10.7 Remote Still Water Zero Adjustment·········································································146 10.
6F8A0917 1. Product Inspection and Storage 1.1 Product Inspection The LF232 electromagnetic flowmeter is shipped in a cardboard box filled with cushioning materials.
6F8A0917 2. Overview The electromagnetic flowmeter is an instrument to measure the volumetric flow rate of conductive fluids using Faraday's law of electromagnetic induction. The flowmeter consists of a detector which generates a signal of electromotive force proportional to the flow rate of the fluid and detects this signal, and a converter which converts the signal detected by the detector to a unified signal output.
6F8A0917 3.
6F8A0917 Internal structure (with converter cover opened) Display section (LCD) Operation switch (Infrared switch) Fuse holder Power switch Terminal block Protection cover - 13 -
6F8A0917 Terminal block construction The label shown left is placed near the terminal board for power supply on the converter. Be alert to electric shock.
6F8A0917 4. Installation Cautionary notes on installation Do not use the LF232 in an explosive atmosphere. DON’T Using this product in an explosive atmosphere can cause explosion. Do not modify or disassemble the LF232 unnecessarily. DON’T Use an appropriate device to carry and install the LF232. DO If this product falls to the ground, injury, or malfunction of or damage to the product, can be caused. Ground the LF232 independently from power equipment.
6F8A0917 4.1 Cautionary Notes on Selecting the Installation Location (1) Avoid places within the immediate proximity of the equipment producing interference to measurement (such as motors, transformers, radio transmitters, electrolytic cells, or other equipment causing electromagnetic or electrostatic interference). (2) Avoid places where excessive vibration occurs. (3) Avoid places where there is direct sunlight as mush as possible. If this is unavoidable, provide a sunshade, etc.
6F8A0917 4.2 How to Install the Converter The converter can be mounted on a panel, wall or on a pipe stand. Install the converter so that the front of the converter cover stays vertically straight and the cable ports of the converter stay at the bottom. Figure 4.1 shows an example of panel and wall mounting installation and Figure 4.2 shows an example of pipe stand installation. Unit: inch (mm) 2.91(74) φ0.43 (φ12) hole Wall surface, etc. 14.57 (370) M10 bolt, etc. 14.57(370) φ0.
6F8A0917 Unit: inch (mm) 2.91 (74) 14.57 (370) M10 U bolt, etc 2” (50A) PIPE Figure 4.
6F8A0917 5. Wiring Cautionary notes on wiring urn off mains power before working on pipes. DO Install a switch and fuse to isolate the LF232 from mains power. Working on pipes while power is applied can cause electric shock. DO Do not work on piping and wiring with wet hands. Ground the LF232 independently from power equipment. Type D (100 ohm or less ground resistance) Wet hands may result in electric shock. DO DON’T Do not conduct wiring work with bare hands.
6F8A0917 (4) If the converter needs to be installed in a location where watertight installation is required, make unused cable ports watertight. (Be careful that the attached blind plate is used for dustproof purpose and it is not effective for watertight installation.) (5) The converter has a surge arrestor/protector installed inside. Therefore, do not conduct a withstand voltage test for the converter. In addition, to check the insulation of the converter, use a voltage of 250VDC or less.
6F8A0917 5.2 External Connections The external connections of the converter are shown in Figure 5.1. See 5.4 “Wiring Method” to connect the cables correctly Terminal block IV wire 5.
6F8A0917 5.3 Cautionary Notes on Wiring 5.3.1 Cautionary Notes on Wiring between Detector and Converter • Flow rate signal cable and excitation cable are attached to the detector. Be sure to use the attached cables. Note: If the length of the cables exceeds 30m, the cables may not be attached. Check whether the cables are attached or not referring to the specification. • The allowable cable length between the detector and the converter differs depending on the conductivity of the fluid to be measured.
6F8A0917 5.4 Wiring Method Do not conduct wiring work when power is applied. Do not work on piping and wiring with wet hands. Wet hands may result in electric shock. Wiring while power is applied can cause electric shock. DON’T 5.4.1 DON’T Terminal Treatment of Cables Proceed as follows to treat the terminals at the converter side of the flow rate signal and excitation cable and to connect these cables to the terminal block. Use appropriate cables referring to 5.1 "Installation Cables.
6F8A0917 Connecting the input signal cable Strip the sheath from the end of each wire of a 2-core individually shielded cable as shown in Figure 5.3 and attach and crimp an M4 crimping terminal with insulating sleeve to the end of each wire. Connect the crimped terminals to the A and B terminals of the terminal block. Twist the shields of the two wires and cover them with a thermal contraction tube or vinyl tube so that the shields do not make contact with the case or the core wires.
6F8A0917 Power cable, current output cable and digital I/O cables Necessary cables should be purchased and prepared by the agent in charge of installation. Strip the sheath from the end of each wire and attach and crimp an M4 crimping terminal with insulated sleeve to the end of each wire. • Connect the power cable terminals to L1 and L2 of the terminal block. • Connect the current output cable terminals to (+) and (−) of the terminal block.
6F8A0917 Referring to 5.2 "External Connections," connect each cable to the terminal block. Tighten the screws of the terminal block tightly to make them securely connected. A loose connection may cause incorrect measurement. After connecting each cable, try to pull it to check whether it has been connected securely. Phillips screwdriver * The appropriate torque for tightening the terminal block screw is 1.2 N m Terminal block Figure 5.
6F8A0917 5.4.3 Grounding The external ground terminal of the detector and the FG terminal of the converter (or external ground terminal of the converter) must be grounded securely with Class D grounding (grounding resistance 100Ω or less). Use an IV wire 5.5mm2 or more for grounding wire. In addition, do not share the grounding wire with other equipment where grounding current may flow. (An independent grounding is preferable.
6F8A0917 Converter terminal block A B X G E Y FG External ground terminal Twisting shields Class D grounding (Ground resistance 100 or less) Input signal cable Excitation cable Twisting shields Ground terminal E G A B X Y Detector terminal block Figure 5.9 (b) Wiring between Detector and Converter (when grounding for detector is difficult) Conductive material pipe Example: Metal, etc.
6F8A0917 5.5 Digital I/O Connections Digital I/O terminals consist of four contact output terminals (DO1 to DO4) and two voltage signal input terminals (DI1 and DI2), and each terminal is isolated from internal circuits. The terminal CO2 is the signal common for DO2 to DO4 and the terminal CI is the signal common for DI1 and DI2. For details, see 10. “Function Description.” The function of each terminal can be selected by settings. For details, see 10. “Function Description.
6F8A0917 5.6 Cautionary Notes on Replacing Converter 5.6.1 Replacing the LF230 Converter The following precautions must be taken to replace the conventional type LF230 with LF232. Installation • Since the hole diameter and pitch for mounting fitting, and the dimensions of the LF232 converter main unit are the same as those of the LF230 converter, it is possible to replace the converter without changing the mounting panel, installation space, etc.
6F8A0917 5.6.2 Combination with an Existing Detector (for Large Meter Size) When the LF232 flowmeter converter (LF232*B for large meter size) is combined with an existing detector of commercial power excitation method, the excitation current may not become stable because of the difference of the excitation method. (Example of symptoms) • When the excitation current is checked in the CAL mode, the excitation current is not displayed exactly as set for the converter.
6F8A0917 5.6.3 Replacement of partially filled pipes type When detector of partially filled pipes type is replaced from LF502 or LF502(FS2 type) to LF232*F, please be careful to the following points. • Installing In the case of replacement from LF502(FS2 type): The diameter of hole, width of installation metal fittings of LF232, an external size of the body of converter are the same. In the installation panel processing, the built-in space, a change is unnecessary.
6F8A0917 • Wirering ・ Hole position of cable connection mouth of LF232* F is the same as LF502 (type FS2). ・ Because specifications of cable connection mouth are different in the following points, Please be careful. Table 5.4 Cable connection mouth specification comparison list (Partially filled pipes type) Model LF502 LF502 (type FS2) LF232*F Joint of case side (Please use only an M27 slim screw G1/2 attached cable ground) Depth 0.433 inch (11mm) Depth 0.
6F8A0917 6. Operation Do not touch the LF232 main body when high temperature fluid is being measured. DON’T The fluid raises the main body temperature and can cause burns when touched. For operation, follow the procedure described below.
6F8A0917 Note: If the fluid to be measured is not filled in the detector pipe (When detector is partially filled pipes type, water level is not enough), flow rate becomes inconsistent and measurement cannot be performed correctly. Be sure to use the flowmeter while the fluid to be measured is filled in the detector pipe.
6F8A0917 7. Display and Controls For the LF232 converter, the measured value can be displayed and the parameters can be checked or set using the LCD display and operation switches. The operation switches are non-contact type (infrared method) and can be operated without opening the converter cover (operable also while the cover is opened). Observe the following precautions when you open the converter cover: • Do not allow the converter exposed to rain and wind.
6F8A0917 7.1 Names and Functions of Display and Controls Display Operation switch (Infrared switch) Figure 7.2 Display and Controls LCD display A 16-character × 2-line liquid crystal display with backlight is used. Instantaneous flow rate and total flow, and various constants such as parameters can be displayed. In addition, the backlight is always lit and data can be read clearly even in a dark place.
6F8A0917 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. Normal operation is impeded depending on the conditions such as disturbing light from surroundings or stain attached to the control panel. When unable to avoid such condition, operate the EMF converter in the following manner.
6F8A0917 Functions of each switch Switch Basic function • Moves the mode from the measurement mode to menu display 10.00 m/s 100.0 % (Measurement mode) ENTER 111 (*note) 000 (Menu lock cancellation screen) • Moves the mode to the setting, calibration or measurement mode A1:EX CURR A1:EX CURR 0.2100A (Menu display) (Setting mode) • Writes data in the setting mode.
6F8A0917 Note : There is not this screen to the converter before serial No.072320999. ( Menu screen is displayed. Menu lock cancellation screen is not displayed. ) Switch Basic function • Returns the screen from the parameter display screen to the menu display screen. • Returns the screen from the parameter input screen (Cursor ON) or adjustment wait screen to the parameter display screen. • Cancels the parameter input check screen (screen blinks) and returns to the parameter input screen.
6F8A0917 (2) Total count display F 9 9 9 9 9 9 9 9 C “C” is displayed when counting is in progress. Total value is displayed in the unit of count When the count exceeds the maximum value of 99999999, the count will be reset to 0 and will be counted again. In the case of forward flow count, “F” is displayed. In the case of reverse flow count, “R” is displayed. (3) Total flow value display Displayed to the least significant digit of the set pulse rate. F 9 9 9 .
6F8A0917 Notes on total flow value display Note 1: The total flow value and the total difference flow value are displayed to the least significant digit of the set count rate. Example: When the set count rate is 0.0001 m3 Total flow / total difference flow display becomes and the value increases in increments of 0.0001 m3. , the display changes to at the If the value reaches next count. .
6F8A0917 (7) Error message / other message display E X C U R R E N T O P E N If an error or alarm condition occurs, a message is displayed in the 2nd line. (8) Fixed output display * F I X O U T 2 0 . 0 m A In the fixed output mode, a message is displayed in the 2nd line. 7.3 Basic Operations (Mode Switching, Setting Mode Operation, Total Counter Operation) 7.3.
6F8A0917 (2) Mode switching operation flow MENU/ENT , , and CANCEL shown in the flow diagram below indicate the switch operations and when the indicated switch is pressed, the process moves to the item indicated by the corresponding arrow Æ. Measurement mode 10.00 m/s 100.0 % Not [111] Press longer for 3 seconds. *(Note 3) *(Note 1) ENTER111 000 V**** Input [111] Totalizer operation mode *(Note 2) Mode Selection Screen >1:SET 2:CNT CTRL COUNT CTRL F 1000 m3 (Point the cursor (>) to CNT CNTRL.
6F8A0917 Note 1: If password is set, the password selection screen appears. For details, see 7.3.3, “Password Input.” Note 2: If no operation is performed for one minute while the mode selection screen or the setting mode menu screen is displayed, the screen returns to the measurement screen Note 3: There is not this screen to the converter before serial No.072320999. There is not software version (V****) to the converter before version V0109.
6F8A0917 7.3.2 Setting Mode Operation Proceed as follows to select the desired item and check or change the setting values. * Switch operation indicates the switches to press. Moving to the menu display Note1 Note1 Switch operation Display example − 10.00 m/s 100.0 % Description Measured value being displayed (measurement mode) Pressing MENU/ENT in the measurement mode for 3 seconds or more, the screen moves to the menu lock cancellation ENTER111 screen.
6F8A0917 To return from the menu display to the measurement mode Switch operation Display example C0: MEAS MODE 10.00 m/s 100.0 % Description Set the digit of number for function number to “0” by pressing and (Note2). The digit of letter can be set to any letter. The mode returns to the measurement mode (measured value display screen). Note1: There is not this screen to the converter before serial No.072320999. There is not software version (V****) to the converter before version V0109.
6F8A0917 Checking or changing the setting values Switch operation ( ) Display example Description C2: RANGE 1 Menu display Select the desired item to check or change using C2 (RANGE 1) in this example. C2: RANGE 1 2.00000 m/s Press MENU/ENT to decide the item to check or change. The cursor disappears and the currently set value appears for you to check. Pressing CANCEL under this condition brings you back to the previous screen. C2: RANGE 1 2.
6F8A0917 7.3.3 Password Input The password function is provided in the LF232 converter to prevent some functions that affect the flow measurement from being used or adjusted. If password is set, totalizer cannot be reset. For the setting menu limited by the password, see 7.4 “Setting Menu List.” In addition, for how to set password, see 8.2.5 “Password Setting.
6F8A0917 Example of password input (mode selection: SET and password: 123) Switch operation Display example Description INPUT PASSWORD 000 The password input screen appears from the measurement mode. The cursor appears. Pressing CANCEL , the screen returns to the mode selection screen. INPUT PASSWORD 100 Press INPUT PASSWORD 100 120 123 Change the number. To change the number of other digit, press to move the cursor to that digit and press to change the number there.
6F8A0917 7.3.4 Totalizer Operation In the totalizer operation mode, the totalizer can be started, stopped and reset. If password is set (if password input does not match), the totalizer can be started or stopped but it cannot be reset. Note: To operate the totalizer, it is necessary to set necessary settings for the totalizer. For details of how to set necessary settings for the totalizer, see 10. “Function Description.
6F8A0917 Example of totalizer operation Note1 Note1 Switch operation Display example − 10.00 m/s 100.0% Description (Measurement mode) Pressing MENU/ENT in the measurement mode for 3 seconds or more, the screen moves to the menu lock cancellation ENTER111 screen. 000 V**** * Pressing CANCEL in the mode selection screen, the mode returns to the measurement mode. Set the menu lock cancellation cord [111] by and .
6F8A0917 7.3.5 Maintenance Menu If you enter the service code to release the protection, the maintenance specific items in the setting mode that are not displayed normally can be accessed and the parameters that are normally prohibited to be rewritten can be changed. This function is mainly used by service personnel, it is not necessary for general customers to enter this function.
6F8A0917 7.4 Setting Menu List The constants set in the LF232 converter can be checked or changed in the order shown in the table below. The details of each item are described in the following sections: • Setting items (A to M): Chapter 8. “Parameter Settings / Adjustment” • Calibration item (N): Chapter 9.
6F8A0917 8. Parameter Settings / Adjustment 8.1 Parameter Setting Items To check or change each constant set in the LF232 converter, first select the desired setting item described in 7.3.2, “Setting Mode Operation.” For setting mode items, follow the explanation below to perform the settings. No. Setting item Display example 8.2.1 Exciting current value A1: EX CURR 8.2.2 Meter size A2: METER SIZE 50 mm 8.2.3 Exciting frequency A3: EX FREQ 24 Hz 8.2.4 Flow direction A4: FLOW DIRCTN 8.2.
6F8A0917 No. Setting item Display example Preset count value Output function setting I1: PRESET CNT I2: PRESET FNC 00009000 1:HOLD High/Low limit alarm On/Off High/Low limit alarm value J1: H ALM SET J2: H ALM VAL 1:ON +100.0 % High high/Low low limit alarm On/Off High high/Low low limit alarm value K1: HH ALM SET K2: HH ALM VAL 1:ON +110.0 % Fluid empty alarm L1: EMPTY ALM 1:NORMAL Self-diagnosis On/Off L2: SELF CHECK 1:ON Alarm output factor setting L3: ALM PRESET 1:WITHOUT EMP 8.2.
6F8A0917 Changing the exciting current value To change the exciting current value, proceed as follows. However, the exciting current value is already adjusted when the product is shipped from the factory. Do not change the exciting current value unless the value is different from the one described on the detector nameplate. If you change this value to other value, this may cause an error. The following is an example to change the exciting current value from 0.1900A to 0.2150A.
6F8A0917 8.2.2 Meter Size Checking the meter size of the detector Proceed as follows to check or change the meter size of the detector. Switch operation Display example Description A2: METER SIZE 50 mm Select A2: METER SIZE from the setting item selection menu. The currently set meter size of the detector appears. A2: METER SIZE Returns to the menu of setting item selection.
6F8A0917 Changing the meter size of the detector The following is an example to change the meter size from 50mm to 10mm. Switch operation Display example Description A2: METER SIZE 50 mm Select A2: METER SIZE from the setting item selection. The currently set meter size (50mm in this example) appears. A2: METER SIZE 50 mm The cursor appears. A2: METER SIZE 100 mm Change the set value for meter size to 100mm.
6F8A0917 8.2.3 Exciting Frequency The exciting frequency can be selected from 6Hz, 12Hz and 24Hz. Since the features shown below are apparent depending on the exciting frequency, select an appropriate exciting frequency. Exciting frequency 6Hz Zero-point stability 12Hz 24Hz Good Response Good Fluid noise immunity Good However, the range of usable exciting frequency depending on the detector to be combined is shown below.
6F8A0917 Changing the setting value for exciting frequency. The following is an example to change the exciting frequency from 24Hz to 12Hz. Switch operation Display example Description A3: EX. FREQ. 24 Hz Select A3: EX FREQ. from the setting item selection menu. The currently set exciting frequency (24Hz in this example) appears. A3: EX. FREQ. 24 Hz The cursor appears. A3: EX. FREQ. 12 Hz Change the exciting frequency to 12Hz. The exciting frequency appears cyclically between 6Hz, 12Hz and 24Hz.
6F8A0917 8.2.4 Flow Direction The flow direction of fluid can be set. Normally use the flowmeter under the condition of NORMAL. Selection item Description 1: NORMAL The flow is a direct flow when the fluid flows in the direction indicated by the arrow on the detector. 2: SWITCH The flow is a direct flow when the fluid flows in the reverse direction of the arrow on the detector. Checking the flow direction. Proceed as follows to check or change the setting value for direction flow.
6F8A0917 Changing the flow direction. The following is an example to show how to change the flow direction from NORMAL to SWITCH. Switch operation Display example Description A4: FLOW DIRCTN 1:NORMAL Select A4: FLOW DIRCTN from the setting item selection menu. The currently set flow direction (NORMAL in this example) appears. A4: FLOW DIRCTN 1:NORMAL The cursor appears. A4: FLOW DIRCTN 2:SWITCH Change the flow direction to SWITCH.
6F8A0917 8.2.5 Password Setting The password function is provided to prohibit the settings and adjustment for the functions that affect the flow measurement. See 7.4 “Setting Menu List” for the functions limited by the password function. If other than “000” is set for password and the mode is retuned to the measurement mode, the password function becomes valid. If “000” is set, there is no limitation such as setting is prohibition by password.
6F8A0917 Changing the password The following is an example to show how to change the password from 123 to 453. Switch operation Display example Description A5: PASSWORD 123 Select A5: PASSWORD from the setting item selection menu. The currently set password data (123 in this example) appears. However, if a wrong password is entered when you move from the measurement mode to the setting mode, *** appears. A5: PASSWORD 123 The cursor appears.
6F8A0917 8.2.6 Normal Indicating Unit You can select one of the units listed below as normal indicating unit for 2 types of units, main unit (UNIT 1) and sub unit (UNIT 2) to be displayed in the measurement mode.
6F8A0917 Checking the normal indicating unit The following is an example to change the main indicating unit (UNIT1) from % to ml/s. In the case of sub unit (UNIT2), select the function “B2: UNIT 2.” Switch operation Display example Description B1: UNIT 1 % Select B1: UNIT 1 from the setting item selection menu. The currently set main indicating unit (% in this example) appears. B1: UNIT 1 % The cursor appears. B1: UNIT 1 ml B B1: UNIT 1 ml B Change the volumetric unit to ml.
6F8A0917 Changing the flow direction for total flow Proceed as follows to change the flow direction for total flow. The following is an example to show how to change the main indicating unit from Forward flow (F) to Forward/Rverse automatic switching (B). In the case of sub unit (UNIT2), select the function “B2: UNIT 2.
6F8A0917 8.2.7 Custom Unit The custom unit, which indicates the flow rate multiplied by an arbitrary coefficient, can be defined. The flow rate indication using the custom unit defined here can be used by selecting CUSTOM in the indicting unit setting.
6F8A0917 Checking the coefficient of custom unit Proceed as follows to check the coefficient of custom unit. Switch operation Display example Description B3: CUSTOM DATA 12340.00 Select B3: CUSTOM DATA from the setting item selection menu. The currently selected coefficient appears. B3: CUSTOM DATA Returns to the menu of setting item selection. Changing the coefficient of custom unit The following is an example to show how to change the coefficient from 1.00 to 1.25.
6F8A0917 Checking the unit string of custom unit Proceed as follows to check the unit string of custom unit. Switch operation Display example Description B4: CUSTOM UNIT AAA/BBB Select B4: CUSTOM DATA from the setting item selection menu. The currently set unit appears. B4: CUSTOM UNIT Returns to the menu of setting item selection. Changing the unit string of custom unit The following is an example to show how to change the unit string from AAA/BBB to XXX/ZZZ.
6F8A0917 8.2.8 Span Value (Range) The following constants are set here. (1) Range type (2) Span unit (changeable only for Range 1) (3) Span value (4) Hysteresis Range type By selecting the range type, the multi-range function can be used in which the range in operation is switched between the multiple ranges depending on whether the flow rate is value large or small, or the flow direction is forward or reverse. If it is not necessary to use the multi-range function, set the Range type to Single range.
6F8A0917 Span value The span value can be set using the actual flow rate unit (m3/h, etc.) and flow velocity unit (m/s). (1) Setting range The span value can be set within the range of 0 –1.0 ft/s to 0 – 32.8 ft/s (0.1m/s to 10m/s) in terms of flow velocity (The range that detector can measure changes with detector type.
6F8A0917 Hysteresis The dead band, which is used to switch the ranges in the case of internal automatic switching multi-range, is set here. It is not necessary to set hysteresis in other range types. (The set value will be ignored.) The hysteresis can be set within the range of 0 to 25% in increments of 0.1%. Span value (range) setting flow The setting sequence of span value (range) is shown below.
6F8A0917 Checking each constant How to check the Range 1 is shown here. To check other setting values, select the following function numbers: Range type C1: RANGE TYPE Range 2 span value C3: RANGE 2 Range 3 span value C4: RANGE 3 Range 4 span value C5: RANGE 4 Hysteresis Switch operation C6: RANGE HYST Display example Description C2: RANGE 1 02.000 m/s Select C2:RANGE 1 from the setting item selection menu. The currently set Range 1 span value appears.
6F8A0917 Changing the range type Before changing the span value, Rang type must be set. The following is an example to show how to change the range type from Single range (1:SINGLE) to the bidirectional internal signal switching multi-range (3:2F-2R). Switch operation Display example Description C1: RANGE TYPE 1:SINGLE Select C1: RANGE TYPE from the setting item selection menu. The currently set range type (1:SINGLE) appears. C1: RANGE TYPE 1:SINGLE The cursor appears.
6F8A0917 Changing the span value The span value for each range is set. The following is an example to show how to change the span value of Range 1 from 2.0m3/h to 100 l/min. Switch operation Display example Description C2: RANGE 1 2.0000 m3/h Select C2: RANGE 1 from the setting item selection menu. The currently set span value for Range 1 (2.0 m3/h in this example) appears. C2: RANGE 1 2.0000 m3/h The cursor appears. Press further to move the cursor to the digit of volumetric unit. C2: RANGE 1 2000.
6F8A0917 Changing the hysteresis The hysteresis value is set to 3% unless otherwise specified when the converter is shipped from the factory. The following is an example to show how to change the hysteresis value from 3% to 5%. Switch operation Display example Description C6: RANGE HYST 03.0 % Select C6: RANGE HYST from the setting item selection menu. The currently set hysteresis value appears. (Note) C6: RANGE HYST 03.0 % The cursor appears. C6: RANGE HYST 03.
6F8A0917 8.2.9 Damping Constant The damping constant is set to average out the output fluctuations. (The larger the damping constant, the more the output is averaged and the fluctuations can be reduced but the response becomes slower.) The damping constant can be set from 0.0sec, 0.5sec, and 1 to 60sec (1sec each). (If detector is partially filled pipes type, the damping constant can be set from 0.0sec, 5sec, and 10 to 600sec (1sec each).) Note: If 0.
6F8A0917 Changing the damping constant The following is an example to show how to change the damping constant from 0.5 sec to 10 sec. Switch operation Display example Description D1: DAMPING 00.5 s Select D1: DAMPING from the setting item selection menu. The currently set damping constant (0.5 s in this example) appears. D1: DAMPING 00.5 s The cursor appears. Press further to move the cursor to the desired digit to change. D1: DAMPING 10.5 s 10.0 s Change the number of the digit.
6F8A0917 8.2.10 Low Cutoff value The low cutoff is the fuction to forcefully fix the current output to 0% when the flow rate becomes equal or below the low cutoff value set near 0%. The low cutoff value can be set from 0 to 10% and in increments of 0.1%. If 0% is set, the low cutoff function does not work. Checking the low cutoff value Proceed as follows to check the low cutoff value. Switch operation Display example Description D2: LOW CUT 01.
6F8A0917 Changing the low cutoff value The following is an example to show how to change the low cutoff value from 1.0% to 3.0%. Switch operation Display example Description D2: LOW CUT 01.0 % Select D2: LOW CUT from the setting item selection menu. The currently set low cutoff value (1.0 % in this example) appears. D2: LOW CUT 01.0 % The cursor appears. Press further to move the cursor to the desired digit to change. D2: LOW CUT 03.0% Change the number of the digit.
6F8A0917 8.2.11 Current Output Setting Used When an Alarm Occurs The current output value setting used when an alarm occurs is the function to fix the current output to a pre-selected value if a fluid empty alarm or a self-diagnosis alarm occurs. For the type of alarms to fix the current output, see the alarm output factor setting in 8.2.19 “Self-Diagnosis Function.” Select the current output value used when an alarm occurs from the table shown below.
6F8A0917 Changing the current output value used when an alarm occurs The following is an example to show how to change the current output value, which is used when an alarm occurs, from 4.0mA (2: 4.0mA) to 24.0mA or more (4: OVER 24.0mA). Switch operation Display example Description D3: 4-20 ALM.OUT 2:4.0mA Select D3: 4−20 ALM. OUT from the setting item selection menu. The currently set alarm output value used when an alarm occurs appears. D3: 4-20 ALM.OUT 2:4.0mA The cursor appears. D3: 4-20 ALM.
6F8A0917 8.2.12 Display low cut On/Off When the low output is cutoff by the setting in 8.2.10 “Low cutoff value,” whether the instantaneous flow rate, flow velocity and % value should be set to zero or not can be selected. Selection Display low cutoff 1: ON Display low cut is effective (On) Display (instantaneous flow rate, flow velocity and %) will be set to zero when the low output is cutoff. 2: OFF Display low cut is not effective (Off) Measured value will be output even if the low output is cutoff.
6F8A0917 Changing the display low cut On/Off setting. The following is an example to show how to change the display low cut setting from 2.OFF to 1:ON. Switch operation Display example Description D4: DSP LOW CUT 2:OFF Select D3: 4−20 ALM. OUT from the setting item selection menu. The currently set alarm output value used when an alarm occurs appears. D4: DSP LOW CUT 2:OFF The cursor appears.
6F8A0917 8.2.13 Output Low Limit Setting The low limit for 4 to 20mA output can be selected. If 3.2mA or 2.4mA is selected, the output value of less than 4mA (0%) can be output when the flow is in reverse direction. The output low limit setting can be selected from the items shown in the table below. Output low limit value Selection Output low limit value 1:4.0mA 4.0mA(0%) 2:3.2mA 3.2mA (-5%) 3:2.4mA 2.4mA (-10%) * To set the output low limit to other than 4.
6F8A0917 Changing the output low limit value setting. The following is an example to change the output low limit setting from 4.0mA (1: 4.0mA) to 3.2mA (2: 3.2mA). Switch operation Display example Description D5: LOW LIMIT 1:4.0mA Select D5: LOW LIMIT from the setting item selection menu. The currently set output low limit value appears. D5: LOW LIMIT 1:4.0mA The cursor appears. D5: LOW LIMIT 2:3.2mA Press D5: LOW LIMIT 2:3.2mA The display blinks and the set value is displayed for confirmation.
6F8A0917 8.2.14 Digital I/O Function Digital I/O functions can be selected. Select the digital I/O functions from the items shown below. For details of digital I/O functions, see 10. “Function Description.” Digital output functions (corresponding to each terminal) DO FUNCT.
6F8A0917 Digital Input Function DI FUNCT.
6F8A0917 Checking each setting for digital I/O The following is an example to show how to check the function setting of Digital Output 1. To check other setting values, select the following function numbers.
6F8A0917 Changing each setting for digital I/O The following is an example to show how to change the function of Digital Output 1 from High limit alarm output (2:HIGH ALM) to Fluid empty alarm (A:EMPTY ALM). To change other setting values, select the following function numbers.
6F8A0917 8.2.15 Count Rate (Pulse Rate) and Pulse Width Totalizer is incremented each time a volumetric flow set for predetermined count rate enters and one pulse is sent out through DO output. It is necessary to set the count rate and pulse width when the total volumetric flow or count value indication is selected or when pulse output is used.
6F8A0917 Pulse width The pulse width for totalizer pulse output is set. If Automatic setting (1:AUTO) is selected for pulse width mode, it is not necessary to set the pulse width. • The pulse width must be set to a value within the range of 0.3ms to 500ms. If you try to set a value exceeding 500 ms, the value will be forcibly changed to 500ms. • The pulse width must be set to 40% or less of the pulse period at 100% output.
6F8A0917 Checking the count rate and pulse width How to check the count rate setting is shown below. To check other setting values, select the following function numbers: Pulse width mode Pulse width Switch operation H2: PLS MODE H3: PLS WIDTH Display example Description H1: COUNT RATE 1.00000 m3 Select H1: COUNT RATE from the setting item selection menu. The currently set count rate appears. H1: COUNT RATE Returns to the menu of setting item selection.
6F8A0917 Changing the pulse width mode setting The following is an example to change the pulse width mode setting from 2:MANUAL to 1:AUTO. Switch operation Display example Description H2: PLS MODE 2:MANUAL Select H2: PLS MODE from the setting item selection menu. The currently set pulse width mode setting appears. H2: PLS MODE 2:MANUAL The cursor appears. H2: PLS MODE 1:AUTO Press H2: PLS MODE 1:AUTO The display blinks and the set value is displayed for confirmation.
6F8A0917 Changing the pulse width The following is an example to change the pulse width from 100ms to 250ms. Switch operation Display example Description H3: PLS WIDTH 100.0 ms Select H3: PLS WIDTH from the setting item selection menu. The currently set pulse width appears. H3: PLS WIDTH 100.0 ms The cursor appears. Press further to move the cursor to the desired digit to change. H3: PLS WIDTH 200.0 ms ↓ 250.0 ms Change the number of the digit.
6F8A0917 8.2.16 Preset Counter Preset counter is the function to output a signal through DO when the totalized count reaches a preset value. For details of preset counter function, also see 10. “Function Description.” The following parameters can be set here: (1) Preset count value (2) Preset output function Notes • Preset counter works only for forward direction flow count. • To use the preset counter, it is necessary to set the DO function for output. For how to set the DO function, see 8.2.
6F8A0917 Checking the preset counter setting How to check the preset count value is shown below. To check the preset output function, select the function “I2: PRESET FNC.” Switch operation Display example Description I1: PRESET CNT 00000300 Select H1:PRESET from the setting item select menu. The currently set preset count value appears. I1: PRESET CNT Returns to the menu of preset item selection.
6F8A0917 Changing the preset output function The following is an example to show how to change the preset output function from Output state hold (1/HOLD) to One-shot pulse output (2:50ms PULSE). Switch operation Display example Description I2: PRESET FNC 1:HOLD Select I2:PRESET FNC from the setting item selection menu. The currently set preset count output function (HOLD in this example) appears. I2: PRESET FNC 1:HOLD The cursor appears.
6F8A0917 8.2.17 Flow Rate High/Low limit Alarm The flow rate high/low limit alarm is the function to generate an alarm when the instantaneous flow rate exceeds a preset high limit value (or low limit value). When an alarm is generated, an alarm message is displayed and a signal can be output through DO. Two outputs are provided each for high limit value and low limit value (4 outputs in total of high limit, high-high limit, low limit and low-low limit) and an alarm output can be sent out separately.
6F8A0917 Checking the high/low limit alarm setting Proceed as follows to check the high/low limit alarm setting. The following is how to check whether the high limit alarm is provided (On) or not (Off).
6F8A0917 Changing the high/low limit alarm On/Off The following is an example to change the high limit alarm setting from OFF to ON. To change other high/low limit alarm On/Off setting, select the following functions. High limit alarm On/Off Low limit alarm On/Off High-high limit alarm On/Off Low-low limit alarm On/Off Switch operation J1: J3: K1: K3: H ALM SET L ALM SET HH ALM SET LL ALM SET Display example Description J1: H ALM SET 2:OFF Select J1: H ALM SET from the setting item selection menu.
6F8A0917 Changing the high/low limit value The following is an example to change the high limit value from +105% to +103%. To change other high/low limit value setting, select the following functions. Low limit value High-high limit value Low-low limit value Switch operation J4: L ALM SET K2: HH ALM SET K4: LL ALM SET Display example Description J2: H ALM VAL +105.0% Select J2: H ALM VAL from the setting item selection menu. The currently set high limit alarm value appears. J2: H ALM VAL +105.
6F8A0917 8.2.18 Fluid Empty Alarm Fluid empty alarm is the function to generate an alarm when a condition is detected in which fluid is not filled or water level is not enough in the measuring pipe of the flowmeter. If an alarm is generated, an alarm message is displayed and a signal can be output through DO. Note • To output a fluid empty alarm through DO, it is necessary to set the DO function for output. For how to set the DO function, see 8.2.14 “Digital I/O Function.
6F8A0917 Changing the fluid empty alarm On/Off setting. The following is an example to change the fluid empty alarm setting from Alarm On (1:NORMAL) to Alarm Off (0:OFF). Switch operation Display example Description L1: EMPTY ALM 1:NORMAL Select L1:EMPTY ALM from the setting item selection menu. Then the fluid empty alarm On/Off setting appears. L1: EMPTY ALM 1:NORMAL The cursor appears.
6F8A0917 8.2.19 Self-Diagnosis Function Self-diagnosis function is the function to generate an alarm if an error is found from the result of diagnosis of internal circuits, memory, etc. If an alarm is generated, an alarm message is displayed and a signal can be output through DO. The following parameters can be set here: (1) Self-diagnosis alarm On/Off (2) DO alarm output factor setting NOTE • To output a self-diagnosis alarm through DO, it is necessary to set the DO function for output.
6F8A0917 Alarm output factor setting When the diagnosis alarm is output through DO, whether a fluid empty alarm should be added to the condition for alarm output can be selected. Selection Diagnosis error alarm factor 1: WITHOUT EMP Fluid empty alarm is not included 2: WITH EMP Fluid empty alarm is included List of alarm output factors Diagnosis error items to output as a diagnosis alarm through DO are shown below.
6F8A0917 Changing the self-diagnosis function setting The following is an example to change the self-diagnosis function from Self-diagnosis function On (1:ON) to Self-diagnosis function Off (2:OFF). To change the setting for alarm output factors, select the function “L3: ALM PRESET.” Switch operation Display example Description L2: SELF CHECK 1:ON Select L2: SELF CHEK from the setting item selection menu. Whether the self-diagnosis function is used (On) or not (Off) appears.
6F8A0917 8.2.20 Rate-of-Change Limit Value and Control Time The rate-of-change limit is the function to prevent a sudden change in flow indication of the converter when the measurement flow signal contains excessive noise. Damping constant is also effective to prevent indication variations by increasing its value but the rate of change limit control is effective against a sudden change in flow indication that the damping constant cannot eliminate.
6F8A0917 Changing the rate-of-change limit setting The following is an example to change the limit value from 1.0% to 1.5%. To change the control time, select the function “M2: LIMIT TIME.” Switch operation Display example Description M1: LIMIT RATE 1.0 % Select M1: LIMIT RATE from the setting item selection menu. The currently set rate-of change limit value appears. M1: LIMIT RATE 1.0% The cursor appears. Press further to move the cursor to the desired digit to change. M1: LIMIT RATE 1.
6F8A0917 8.3 Initial Settings When Shipped from the Factory Initial settings used when shipped from the factory unless otherwise specified are shown below. No. Parameter name Initial setting values A1 Exciting current Adjusted value when shipped from the factory (described on the detector nameplate) A2 Meter size Specified meter size when ordered (described in the Test Record) A3 Exciting frequency Recommended value for the detector combined (See 8.2.3 “Exciting Frequency.
6F8A0917 No. H1 Parameter name Count rate Initial setting values Meter size 1/10" to 1/4" (2.5 to 6 mm) 1L Meter size 1/2" to 1 1/2” (15 to 40 mm) 0.01m3 Meter size 2" to 4” (50 to 100mm) 0.1m3 Meter size 6” to 24” (150 to 600mm) 1m3 Meter size 28” to 120” (700 to 3000mm) 10m3 H2 Pulse width setting mode AUTO H3 Pulse width 100 ms I1 Preset count value 00000000 I2 Preset output function HOLD J1 High limit alarm setting OFF J2 High limit alarm value 0.
6F8A0917 8.4 Fixed Value Output (Loop Check) The fixed value output is the function to output a fixed current and/or a fixed pulse output independently of the flow rate signal. The following parameters can be set here: (1) Fixed value output On/Off setting (2) Fixed current output value (3) Fixed pulse output value Notes • Fixed pulse output can be sent out only when DO1 or DO2 is set for pulse output.
6F8A0917 Fixed pulse output value The pulse frequency is set, which is used to output in the fixed output mode through the DO terminal where the pulse output function is set. The fixed pulse output value can be set within the range of 0 to 1000pps in increments of 1pps. Note: When the pulse output is sent out from DO2 terminal, up to 100pps can be output. Checking the fixed output function setting Proceed as follows to check the fixed output function.
6F8A0917 Changing the fixed output function The following is an example to change the fixed output function from Fixed value output OFF to ON and then go on to set the current output value and the pulse output value.
6F8A0917 Changing the fixed output constant The following is an example to change the fixed pulse output value from 50pps to 100pps. To change the fixed current output value, select the function “L2: FIX. CURR.” Switch operation Display example Description L3: FIX. PULSE 0050 pps Select L3: FIX. PULSE from the setting item selection menu. The currently set fixed pulse output value appears. L3: FIX. PULSE 0050 pps The cursor appears. Press further to move the cursor to the desired digit to change.
6F8A0917 8.5 Zero Adjustment 8.5.1 Still Water Zero Adjustment Still water zero adjustment must be performed when the fluid in the measuring pipe of the detector stays still. Switch operation Display example − 10.00 m/s 100.0 % ENTER111 000 Note2 Note2 ENTER111 111 − Description Measured value being displayed (measurement mode) Pressing MENU/ENT in the measurement mode for 3 seconds or more, the screen moves to the menu lock cancellation screen.
6F8A0917 E0: MEAS MODE 10.00 m/s 100.0 % Returns to the measurement mode (measured value display screen). Note1: If the flow rate value is outside of the range of ±1.25 m/s, the adjustment result will not be reflected on the flow rate measured value. Note1:If the flow rate value is outside of the range of ±1.25 m/s, the adjustment result will not be reflected on the flow rate measured value. Note2: There is not this screen to the converter before serial No.072320999.
6F8A0917 8.5.2 Zero Offset Adjustment This function is used to perform zero adjustment simply by comparing the output of the flowmeter with other process value without stopping the process flow. If zero adjustment can be performed with still water condition, it is not necessary to set this adjustment value. How to calculate the zero offset value Zero offset is performed by setting the adjustment value.
6F8A0917 Changing the zero offset adjustment value Changing the zero offset adjustment value from +1.0% to −2.5%. Switch operation Display example Description O1: MANUAL ZERO +001.0% Select O1: MANUAL ZERO from the setting item selection menu. The currently set zero offset adjustment value appears. O1: MANUAL ZERO +001.0% The cursor appears. Press further to change the cursor to the desired digit to change. O1: MANUAL ZERO -001.0% ↓ -002.5% Change the number of the digit.
6F8A0917 9. Mag-Prover Calibration 9.1 Calibration Items The calibration mode of the LF232 flowmeter converter is used to check or perform zero and span calibration of the converter and check the exciting current. To change the mode to the calibration mode, select the setting item in accordance with the procedure in 7.3.2 “Setting Mode Operation.” The procedure on the following pages is used to check or perform zero and span calibration of the converter and check the exciting current.
6F8A0917 9.2 Converter Check / Calibration 9.2.1 0% Flow Rate Calibration (Zero Calibration) Using Mag-Prover internal calibration circuit, 0% flow rate (hereafter called zero point) calibration can be performed. Checking the zero point Switch operation Display example Description P1:FLOW CAL 0 0.0 % Select P1:FLOW CAL 0 from the calibration item selection menu. Zero point using the simulation input appears. P1:FLOW CAL 0 Returns to the menu of calibration item selection.
6F8A0917 9.2.2 50% Flow Rate Calibration 50% flow rate value can be checked only. Checking the 50% flow rate value Switch operation Display example P2:FLOW SIG 50 50.1 % Description Select P2:FLOW SIG 50 from the calibration item selection menu. 50% flow rate value using the simulation input appears.
6F8A0917 9.2.3 100% Flow Rate Calibration (Span Calibration) Using the Mag-Prover internal calibration circuit, 100% flow rate value (hereafter called the span value) calibration can be performed. Checking the span value Switch operation Display example Description P3:FLOW CAL100 100.1 % Select P3:FLOW CAL 100 from the calibration item selection menu. Span value using the simulation input appears. P3:FLOW CAL100 Returns to the menu of calibration item selection.
6F8A0917 9.2.4 Checking the Exciting Current Value The monitor value of the exciting current can be checked. Checking the exciting current value Switch operation Display example Description P4:EX CURR DSP 0.2100 A Select P4:EX CURR DSP from the calibration item selection menu. Span value using the simulation input appears. P4:EX CURR DSP Returns to the menu of calibration item selection. * The exciting current value is adjusted when shipped from the factory.
6F8A0917 10. Function Description The LF232 flowmeter converter is equipped with 4 digital outputs and 2 digital inputs (1 digital output as standard), enabling you to use these as various functions such as pulse output and alarm outputs. Digital I/O functions are described below. Functions Description Flow totalization Totalizes flow volume in volumetric unit. For totalized flow, a pulse output per each unit of flow volume can be sent out.
6F8A0917 10.
6F8A0917 10.2 Totalizer and Pulse Output Proceed as follows to use the totalizer and pulse output. Count Rate and Pulse Width Settings Follow the procedure in 8.2.15 “Count Rate (Pulse Rate) and Pulse Width” and set the flow rate per 1 count (1 pulse) (count rate), pulse width mode and pulse width. * Count rate can be set within the range of 3.6 to 3,600,000 pulses/h (1/1000 to 1000 pulses/s) with respect to the set range.
6F8A0917 * Continued from the previous page Clear (reset) the totalizer. (Note1) Press switch to clear the count. If you have changed the count rate, clear (reset) the count before you start the totalizer. Start the totalizer. (Note1) • Press to start the totalizer. Check that “C” is shown on the display indicating that counting is in progress. Note 1: The LF232 converter has the function to start/stop the totalizing operation or clear the internal totalizer.
6F8A0917 Totalizer operation using digital input signals Totalizer and pulse output can be operated. Remote operations of the totalizer and pulse output can be performed using the Digital Input signals. Follow the procedure in 8.2.14 “Digital I/O Function” and set the Digital Input (DI) functions.
6F8A0917 10.3 Multi-Range Functions Five types of multi-range functions can be set using the Range Type: Range Typ (1) Single direction, 4 ranges Internal automatic switching (2) Forward and reverse directions, 2 ranges Internal automatic switching (3) Single direction, 2 ranges External signal switching (4) Forward and reverse directions, 2 ranges External signal switching (5) Single direction, 4 ranges E xternal signal switching To use the multi-range function, proceed as follows to set.
6F8A0917 Output performance when multiple ranges are used (1) Single direction (internal automatic switching), 4 ranges Output (%) 125 Range 1 100 Range 4 Hysteresis (0 to 25%) Range 3 0 Reverse direction Range output No. 1 Range output No. 2 20mA Range 2 4mA 0 Forward direction ON Flow rate OFF ON ON OFF OFF • Current output is 4mA as standard when fluid flows in reverse direction.
6F8A0917 (2) Forward and reverse directions (internal automatic switching), 2 ranges Output (%) 125 100 Range 3 Range 1 20mA Range 2 Range 4 Hysteresis Hysteresis 0 4mA Reverse direction Range output No. 1 OFF 0 ON Range output No. 2 Forward direction ON OFF ON OFF Output when switched from Reverse to Forward direction Output when switched from Forward to Reverse direction Output Output Low cutoff 1.25 Low cutoff 1.25 Low cutoff Reverse direction Range output No.
6F8A0917 (3) Single direction (external signal switching), 2 ranges Output (%) 125 100 Range 2 Range 1 0 Reverse direction 0 External range switching signal 4mA Forward direction Flow rate H level input L level input ON OFF (Range output No. 1) • Current output is 4mA as standard when fluid flows in reverse direction. When the low cutoff function is not used (low cutoff setting is 0), it is possible to output the current output signal in linear scale up to 3.2mA or 2.
6F8A0917 (4) Forward and reverse directions (external signal switching), 2 ranges Output (%) 125 100 Range 3 Range 2 Range 4 Range 1 0 Reverse direction Forward direction 0 External range switching signal L level input (Range output No. 1) 4mA H level input OFF H level input L level input ON ON OFF ON (Range output No. 2) Flow rate OFF • Works even if the range output is not used.
6F8A0917 (5) Single direction (external signal switching), 4 ranges Output (%) 125 100 Range 1 Range 4 Range 3 20mA Range 2 0 Reverse direction 0 External range switching signal No. 1 4mA Forward direction L level input External range switching signal No. 2 (Range output No. 1) (Range output No. 2) Flow rate H level input H level input H level input OFF L level input L level input ON ON ON OFF OFF • Current output is 4mA as standard when fluid flows in reverse direction.
6F8A0917 10.4 Flow Rate High/Low Limit Alarm Output Proceed as follows to use the flow rate high/low limit alarm. High/Low Limit Alarm Value Setting • Follow the procedure in 8.2.17 “Flow Rate High/Low alarm” and set the high limit alarm, high-high limit alarm, low limit alarm or low-low limit alarm to ON and set the alarm value. For the alarm not used, set OFF to that alarm setting. DO Setting • Follow the procedure in 8.2.
6F8A0917 • In the case of Multi-range setting Output (%) Range 2 Range 1 Range 2 High limit setpout value Hysteresis 2.5% Hysteresis 2.5% Low limit setpoint value Hysteresis 2.5% Low limit alarm generated High limit alarm generated Low limit alarm generated Time * High/low limit alarm set-point value is a value indicated in percent of the Range 1. * The output state when an alarm occurs becomes the state set for alarm output of digital output.
6F8A0917 • In the case of 2 high limit alarm points (high limit and high-high limit) Output (%) High-high limit setpoint Hysteresis 2.5% High limit set-point High-high limit alarm generated High limit alarm generated Time * The output state when an alarm occurs becomes the state set for alarm output of digital output. When the power supply of the converter is turned off, the contact is open.
6F8A0917 10.5 Fluid Empty Alarm Output Proceed as follows to use the fluid empty alarm. (Note: In the case of LF232*F; Fluid empty alarm function is not usable. Set this function 'OFF'.) Alarm Output Setting • Follow the procedure in 8.2.18 “Fluid Empty Alarm” and set the fluid alarm setting to ON (NORMAL, SENTITIVE or SENSITIVE-H). DO Setting • Follow the procedure in 8.2.14 “Digital I/O Function” and set the Digital Output (DO) for fluid empty alarm output.
6F8A0917 10.6 Preset Counter Output Function A contact signal is output when the totalized flow count exceeds the preset value (preset count value). Proceed as follows to use the preset counter output. Totalizer Setting • Follows the procedure in 10.2 “Totalizer and Pulse Output” and set necessary items to the totalizer. Preset Count Value, Preset Output Function Setting • Follow the procedure in 8.2.16 “Preset Counter” and set the preset count value and output function.
6F8A0917 Preset counter output performance • Example to reset the totalizer using an external signal input (When preset output level hold (Contact ON) is set) H level input Reset/Start signal (DI control signal level H) L level input Preset count set-point value Totalizer flow count 0 Counter reset Preset output Counter start Counter reset ON OFF Input/Output Timing Chart * When the Reset/Start signal is in H level (DI counter control signal level: H), the totalizer is reset to zero and stops counting
6F8A0917 • Example to reset the totalizer using an external signal input (When one-shot pulse output is set) H level input Reset/Start signal (DI control signal level L) L level input Totalizer flow count Preset count set-point 0 Counter reset Counter start Counter reset Preset output ON OFF Preset output is OFF because Counter is reset. Preset output OFF because pulse width is reached.
6F8A0917 • Output example of one-shot pulse output Preset count set-point value: 100 200 100 Totalizer count 0 ON Preset output OFF Preset output OFF because pulse width is reached. Input/Output Timing 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. When the preset value exceeds 100, the preset value is changed to 200 (adding the preset count of 100 to the current preset value of 100).
6F8A0917 10.7 Remote Still Water Zero Adjustment Still water zero adjustment can be performed using an external signal. To use this function, follow the procedure in 8.2.14, “Digital I/O Function” and set the DI as a zero adjustment start signal.
6F8A0917 10.8 Remote Selection of Fixed Value Output 4 to 20mA output and pulse output can be set to a fixed preset value using a remote signal input. Proceed as follows to use this function. Fixed Output Value Setting • Follow the procedure in 8.4 “Fixed Value Output (Loop Check)” and set the current output value and pulse output value to be used at the time of fixed output. Set OFF for fixed output switching. If the pulse output is not used, it is not necessary to set the pulse output value.
6F8A0917 10.9 Converter Error Alarm Output If one or more of the following errors occur in a self-diagnosis sequence, an alarm signal will be output using contact signals. List of Alarm Output Factors Diagnosis error alarm output (DO) Diagnosis error item WITHOUT EMP WITH EMP RAM error ROM error Exciting current value error Exciting current wire broken ADC error (error of flow measurement circuit) Parameter error − Fluid empty alarm ○: If an error is detected, DO diagnosis error alarm is output.
6F8A0917 11. Communications Function The LF232 Series Converters are equipped with HART*1 protocol to transmit digital signals over the 4 to 20mA output line. The AF900 hand-held terminal (hereafter called HHT) can be used to check or change various parameters, calibrate the flowmeter or monitor the measured value from a remote place. For the detailed operation and specification of HHT, refer to the "Hand-held Terminal for Sensor with Communication Function AF900 Instruction Manual" (6F8A0849). *1 11.
6F8A0917 Converter terminal block HHT Figure 11.
6F8A0917 11.2 Procedure for Communication with HHT This section describes the HHT basic operations for communication between the flowmeter and HHT. For details, refer to the HHT instruction manual. * Carrying out the following preparatory operations to a commercially available PDA (OS: Windows CE), the PDA can be used as a HHT. Procedure Operation Prepare a hand-held terminal (1) Install the AF900 application software to a commercially available PDA (OS: Windows CE) main unit.
6F8A0917 11.3 Cautionary Notes on Communications Observe the following limitations when you communicate with flowmeter using HHT. Current output load (1) Load resistance: 240Ω to 1kΩ (including communications line resistance) (2) Load capacitance: 0.25 μF maximum (including communications line capacitance) (3) Load inductance: 4mH maximum (including communications line inductance) (For maximum cable length, about 2km is a guideline length when CVV-S 1.25mm2 is used.
6F8A0917 12. Diagnosis and Alarms 12.1 Diagnostic messages The LF232 converter is equipped with the function to diagnose such errors as setting errors, I/O errors or internal errors of the instrument and shows the error messages on the LCD display or on the HHT through communications. The diagnostic messages and their corrective actions are described below.
6F8A0917 Process error alarm LCD display Description Corrective action The measured value is above the 125% of the span. The setting range for measured value is narrow or the flow rate is unexpectedly large. Check whether the set value is correct or not and check that there is no problem in the process. The measured value is below the −125% of the span The setting range of measured value is narrow or the flow rate is unexpectedly large.
6F8A0917 Self-diagnosis error The converter performs an operation check immediately after power is turned on and if an error is found, a self-diagnosis error is generated. If more than one error occurs at the same time, the contents of those errors will be displayed cyclically. The diagnosis about excitation is carried out using the internal ADC function. Therefore, if an error of No.6 internal ADC occurs, Excitation wire of No.4 and Excitation circuit of No.5 cannot be diagnosed correctly.
6F8A0917 12.2 Output When an Error or Alarm Occurs Error indication ROM ERROR Measured value display (Note 1) RAM ERROR Current output (4 to 20mA) Totalizer pulse output Remarks − 4mA (standard) Stopped (Note 3) After power-up, measurement does not start. − 4mA (standard) Stopped (Note 3) After power-up, measurement does not start. Zero PARAMETER FAIL (Note 2) Zero EX.
6F8A0917 13. Maintenance and Inspection Do not conduct wiring work when power is applied. DON’T 13.1 Do not touch the LF232 main body when high temperature fluid is being measured. Wiring while power is applied can cause electric shock. DON’T The fluid raises the main body temperature and can cause burns when touched.
6F8A0917 Check / Replacement of power supply unit In general, electronic components deteriorate faster if the ambient temperature is high. The life of the power supply unit is about 10 years if the ambient temperature is 40°C, and 5 to 6 years if the temperature is 50°C or more. To extend the life of the flowmeter, it is recommended that you replace the power supply unit early. Contact your nearest Toshiba representative for a flowmeter inspection or unit replacement.
6F8A0917 13.2 Troubleshooting If a problem occurs, you may find a cause of the problem by performing the simple inspection. Before you call repair service personnel, inspect the flowmeter using the flowcharts shown below. 13.2.1 Flow rate is not indicated START Is the rated power supplied for each device? NO Use the rated power supply for each device. NO Install the cables correctly according to 5. “Wiring.
6F8A0917 13.2.2 Flow rate indication is not correct START Is the velocity range correctly set? NO Set it correctly according to 8. “Parameter Settings/Adjustment.” NO Perform zero adjustment according to 6. “Operation” and 8.5 “Zero Adjustment.” NO Set the exciting current correctly according to 8. “Parameter Settings.” YES Clean the inside wall of the detector pipe to remove the deposits. NO Design the output circuit so that the output load resistance is less than 1 k .
6F8A0917 13.2.3 Flow rate indication is not stable START Is power supply voltage within the specified range? NO Use a power supply within the specified range. YES Connect each cable securely to the terminal block. YES Aren't the cables slackened? NO Are converter and detector grounded with Class D ground (100 or less ground resistance)? NO Ground the converter/detector with Class D ground (100 or less ground resistance) using IV wire of 5.5 mm² minimum.
6F8A0917 13.2.4 When switch operation is unable START Does intense light shine on the control panel such as direct sunlight or reflected sunlight by window glass or metal sheet? YES Place a cover to block the light from surroundings, or cover the control panel by hand to block the light. NO Does the brightness change always by ON/OFF of lighting? YES Place a cover to block the light from surroundings, or cover the control panel by hand to block the light.
6F8A0917 14. Principle of Operation The operating principle of the electromagnetic flowmeter is based on Faraday's Law of electromagnetic induction. The principle of operation is that an insulated pipe with inner diameter D is placed vertically to the direction of a magnetic field with flux density B (see Figure 14.1). When an electrically conductive fluid flows in the pipe, an electromotive force signal E is induced between a pair of electrodes placed at right angles to the direction of magnetic field.
6F8A0917 15. Specifications 15.1 Specifications Detector Combined Specifications 1. Measuring range: (measuring range in terms of flow velocity) 0 –1.0 ft/s to 0 – 32.8 ft/s (0 – 0.
6F8A0917 2. Measurement accuracy: (Accuracy when combined with detector) • Combined detector: LF470 (Meter size 1/10” to 1/4” (2.5 to 6mm)) Range Flow rate to the range (%) 1.0-3.3ft/s (0.3-1.0m/s ) 3.3-32.8ft/s (1.0-10m/s ) 0 to 50 % ± 0.8 % FS ± 0.4 % FS 50 to 100 % ± 0.8 % FS ± 0.8 % of rate • Combined detector: LF150 (Meter size 20” to 120” (500 to 3000mm)) ±0.
6F8A0917 3.
6F8A0917 • Range switching output One Digital Output (DO) is used • Single direction, 2-range switching signal • Forward/reverse direction switching signal Two Digital Outputs (DO) are used • Single direction, 4-range switching signals • Forward/reverse 2-range switching signals • High/low limit alarm output An alarm is output when flow rate goes above or below the set-point value Setting range −10 to 110% of the settable maximum range High limit 2 points, low limit 2 points can be set At the time of alarm
6F8A0917 5. Display/setting items • Output display: 16-character × 2-line dot-matrix LCD (with back light) Indicating unit: 2 units can be selected from the flowing units: flow velocity, instantaneous flow rate, total flow (forward/reverse/difference flow), total count, %, custom unit. • Setting: Various parameters can be set without opening the converter housing using 4 infrared switches (password can be set) Settable also with AF900 Handheld terminal • Damping: 0.
6F8A0917 15.2 Model Number Table LF232*A, LF232*B Converter model number table Model number Specification code Description 1 2 3 4 5 6 7 8 9 10 11 12 L F 2 3 2 Separate type converter Purpose A Standard Compatible detector (Note 1) (Note 2) (Note 3) A Medium to small size (Meter size: 1/10” to 18”(2.
6F8A0917 LF232*F (for partially filled pipes detectors) Converter model number table Model number Specification code Description 1 2 3 4 5 6 7 8 9 10 11 12 L F 2 3 2 Separate type converter Purpose A Standard Compatible detector F For Partially-filled pipes (Meter size : 6” to 24” (150mm to 600mm) ) Mounting nuts and bolts C Panel, wall mounting (BNP material: SUS304) E Pipe mounting (BNP material: SUS304) Digital input/output 1 Current output + Digital outputs points (1 point) 3 Current output
6F8A0917 16. Outline Drawing Electromagnetic Flowmeter Converter LF232 Type Gross mass: approx. 18 lb(8kg) (including a mounting plate) 9.33 (237) φ0.47(φ12) hole (4 places) 8.74(222) 6.10(155) 15.75(400) 14.14.57(37 2.94(74) Power cable connection Signal cable connection Output cable connection Ground terminal 2.99 (76) Excitation cable connection Figure 16.1 2.99(76) Digital I/O cable connection 2.
6F8A0917 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 LF SER. NO.
FCF50017