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Keiki MRG-10 User Manual

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Document No.: KF05-001G
MRG-10
User's Guide
User's Guide
User's Guide
User's Guide

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Summary of Contents for Keiki MRG-10

  • Page 1 Document No.: KF05-001G MRG-10 User’s Guide User’s Guide User’s Guide User’s Guide...
  • Page 2 Safety Cautions The caution message shown in the User’s Guide is defined as follows: Indicates that incorrect usage may result in death or ! ! ! ! serious injury to the operator. Warning CAUTION Indicates that incorrect usage may result in injury to the ! ! ! ! operator or damage to the equipment CAUTION...
  • Page 3 Introduction This User’s Guide includes detailed explanations of MRG-10 safety cautions, installation, configuration, and troubleshooting. Users should carefully read this manual before operation to ensure an adequate understanding of the equipment. Proper use of the User’s Guide The following points must be observed: (1) Carefully read the User’s Guide...

  • Page 4: Table Of Contents

    Contents About this manual 1.Product Description Features Measuring principle MRG-10 measuring system 2.Mechanical Installation Requirements Dimensions Tools Mounting Cone Antenna Mounting Rod Antenna 2.6 Installation Hints 2-10 3.Electrical Installation Connection of MRG-10 Cables Load Power Supply Grounding 3.6 Arrester replacement 4.Configuration method...

  • Page 5: About This Manual

    MRG-10. It also describes how to configure the unit. The main purpose of the book is to serve as a guide to installing and operating the MRG-10. It is not intended to cover service tasks such as changing circuit boards or internal software.

  • Page 6: Product Description

    Product Description Product Description 1 1 Product Description The MRG-10 is a loop-powered radar level gauge, which can be installed easily in a variety of applications. The MRG-10 employs a non-contact radar level gauging principle based on pulsed microwave signals and is suitable for level measurement in applications such as liquids, pastes and slurries.

  • Page 7: Mrg-10 Measuring System

    Product Description Product Description MRG-10 measuring system MRG-10 can be configured with its onboard 4 key switches, a handheld terminal or remotely from a personal computer via a modem. The MRG-10 is connected to a PLC or power supply unit.

  • Page 8: Mechanical Installation

    MRG- - - - 10 10 10 Mechanical Installation Mechanical Installation Mechanical Installation Mechanical Installation 2 Mechanical Installation Requirements 2.1.1 Cone antenna Mounting position Do not mount the transmitter at the center of the tank or close to the tank wall as this may reduce the measuring range or accuracy and make the transmitter more sensitive to echo disturbances.
  • Page 9 MRG- - - - 10 10 10 Mechanical Installation Mechanical Installation Mechanical Installation Mechanical Installation 2.1.2 Rod antenna Mounting position Do not mount the transmitter at the center of the tank or too close to the tank wall as this may reduce the measuring NPT 1 1/2 range or accuracy and make the transmitter more sensitive to echo...
  • Page 10 MRG- - - - 10 10 10 Mechanical Installation Mechanical Installation Mechanical Installation Mechanical Installation Maximum measuring distance Maximum measurement distance is determined by antenna type, dielectric constant of the product and product surface conditions. Please refer to the table below. These values are rough estimates, and are strongly influenced by the measuring conditions.

  • Page 11: Dimensions

    * : Extended Part Rod Long *: Part extension Weights MRG-10(except antenna) 2.5 kg 4” Cone antenna 0.8 kg 6” Cone antenna 1.2 kg 8” Cone antenna 1.8 kg MRG-10 with rod antenna short 3.4 kg MRG-10 with rod antenna long 3.7 kg...

  • Page 12: Tools

    10 10 Mechanical Installation Mechanical Installation Mechanical Installation Mechanical Installation Flange The MRG-10 gauge is mounted with a flange of the following specifications Cone antenna Rod antenna NPT 1 ½ Threaded Maximum thickness : 29mm (ANSI Class-150 8” ). Tools The following tools are needed for installation of MRG-10: •...

  • Page 13: Mounting Cone Antenna

    Cone Plate Make sure that the bottom side of the flange is flat and all parts are clean and dry as problems related to this may Cone result in gas leakage when the MRG-10 is installed on Antenna pressurized tanks.
  • Page 14 Make sure that the O-ring inside of the sleeve is clean as improper sealing may lead to gas leakage problems when the MRG-10 is installed on pressurized tanks. Union Nut 3. Carefully insert the antenna adapter of the transmitter into the sleeve.

  • Page 15: Mounting Rod Antenna

    Mechanical Installation Mechanical Installation Mechanical Installation Mounting rod antenna ! ! ! ! Warning Do not damage antenna. Damaged antenna may cause gas leakage if the MRG-10 is installed on a pressurized tank. Flange （NPT 1 1/2） NPT 1 1/2 Gasket...
  • Page 16 MRG- - - - 10 10 10 Mechanical Installation Mechanical Installation Mechanical Installation Mechanical Installation Fix rod antenna to flange NPT 1 1/2 Flange NPT 1 1/2 Place the gasket on the tank nozzle. Carefully fit the flange and the cone antenna on the tank nozzle. Tighten the assembly with the screws and nuts.

  • Page 17: Installation Hints

    Obstacles in the radar beam may generate signal reflections (false echoes) which may be larger than the reflected signals from the surface of the liquid. The MRG-10 may erroneously interpret such false echoes as reflections from the liquid surface. To reduce the influence of false echoes, attenuate such signals using the following methods.
  • Page 18 MRG- - - - 10 10 10 Mechanical Installation Mechanical Installation Mechanical Installation Mechanical Installation Correct Wrong 2. Shoulders and Struts Install a reflector (flat metal plate) above the obstacle as shown in the figure. Reflector ! ! ! ! Warning Measuring range may be reduced if there are obstacles Shoulder...
  • Page 19 MRG- - - - 10 10 10 Mechanical Installation Mechanical Installation Mechanical Installation Mechanical Installation 5. Tank Installation For round tank applications, install the MRG so the axis of the electric field is oriented 45 degrees to the tank wall to avoid influences from edge reflections off channel walls and the liquid surface. For flat wall tank applications, install the MRG so the axis of the electric field is perpendicular to the tank wall.

  • Page 20: Electrical Installation

    Electrical Installation Electrical Installation Electrical Installation 3 Electrical Installation Connection of MRG-10 ! ! ! ! Caution Handle the front cover with care as the glass panel and gasket are removable. The glass panel and gasket are fixed in place when the cover is screwed onto the case and tightened.

  • Page 21: Cables

    MRG- - - - 10 10 10 Electrical Installation Electrical Installation Electrical Installation Electrical Installation Cables Cable Use shielded twisted pair for connection. Cross-sectional area of conductor is 0.2 …2.5mm (AWG24 …14) Cable entry 2×M20×1.5 (cable diameter 10mm max.) Load ®...

  • Page 22: Arrester Replacement

    MRG- - - - 10 10 10 Electrical Installation Electrical Installation Electrical Installation Electrical Installation 3.6 Arrester replacement Step 1; Loosen the 4 screws indicated by the arrows in the schematic below and remove the LCD panel. Step 2; Loosen the Arrester PWB fixing screw indicated by the arrow. Step 3;...

  • Page 23: Configuration Method

    Configuration method Configuration method Configuration method Configuration method 4 Configuration method It is a simple task to configure the MRG-10. The MRG-10 can be configured with: Display Panel & Key SW on MRG-10 PC (Setup Software) Display Panel & Key SW 4.1.1...
  • Page 24 MRG- - - - 1 1 1 1 ０ ０ ０ ０ Configuration method Configuration method Configuration method Configuration method 4.1.3 Examples Example-1 When R-constant is set to 6.275m from the default value. Step Display 7.956m M easuring level(m) (Normal operation mode) E NT [1--] Main menu number (Configuration mode)
  • Page 25 MRG- - - - 1 1 1 1 ０ ０ ０ ０ Configuration method Configuration method Configuration method Configuration method Example-2 When Volume point 2 is set to 2345.67m 3 . Volume point can be set from 00000.00 to 99999.99. Step Display 4.231...
  • Page 26 MRG- - - - 1 1 1 1 ０ ０ ０ ０ Configuration method Configuration method Configuration method Configuration method 4.1.4 Parameter instructions - shaded areas indicate default settings. [1--] CONFIGURATION Settings [1-1] Output Parameter: LCD display Parameter Value Description Level Level value from target Ullage...
  • Page 27 MRG- - - - 1 1 1 1 ０ ０ ０ ０ Configuration method Configuration method Configuration method Configuration method [1-8] Offset parameter for LCD level values Parameter Default Value Description -99.999-99.999 0.000 Parameter range, in metric [m] units If measurement unit is [ft], display will be converted to show ‘feet’ units Note: Offset affects LCD display only and does not affect analog output or other values.
  • Page 28 MRG- - - - 1 1 1 1 ０ ０ ０ ０ Configuration method Configuration method Configuration method Configuration method [3--] Volume Setting [3-1] Linearization Selection Parameter Value Description Not Calculated Vertical Cylinder Spherical Horizontal Cylinder User Tank Table Tank Configurations 3: Horizontal Cylinder 1: Vertical Cylinder 2: Spherical...
  • Page 29 MRG- - - - 1 1 1 1 ０ ０ ０ ０ Configuration method Configuration method Configuration method Configuration method [3-5] Delete all tables Parameter Value Description Do not delete Delete all Setting “1” clears table [3-6] Diameter of the tank Parameter Default Value Description...
  • Page 30 MRG- - - - 1 1 1 1 ０ ０ ０ ０ Configuration method Configuration method Configuration method Configuration method [4--] Calibration [4-1] 4mA Calibration Parameter Default Value Description 3.50-4.50 4.00 In fixed current output mode with current set at 4mA, input ammeter reading.
  • Page 31 MRG- - - - 1 1 1 1 ０ ０ ０ ０ Configuration method Configuration method Configuration method Configuration method [5-5] Bottom Window Parameter Default Value Description 0-0.5 Parameter range in metric [m] units If measurement unit is [ft], display will be converted to show ‘feet’ units. Valid only when [5-7] is set at “0".
  • Page 32 MRG- - - - 1 1 1 1 ０ ０ ０ ０ Configuration method Configuration method Configuration method Configuration method [6--] Noise [6-1] Noise table number Parameter Default Value Description 0-10 Input required no. of points for table [6-2] Noise table （ [600] ~ [609] ） Parameter Default Value Description...
  • Page 33 MRG- - - - 1 1 1 1 ０ ０ ０ ０ Configuration method Configuration method Configuration method Configuration method [7--] Other [7-1] Password: not normally used [7-2] Re-search Parameter Value Description Research Mandatory surface echo re-search [7-3] User Reset Parameter Value Description...

  • Page 34: Configuration

    MRG- - - - 10 10 10 Configuration Configuration Configuration Configuration 5 Configuration Basic settings Set up the following parameters - Output Parameter Select measurement value displayed on the LCD. - Meas. Unit Select measurement unit, meter or feet. - Antenna Type Select type of antenna.
  • Page 35 Configuration Configuration Configuration with PC software - PC connection PC configuration software can also be used for commissioning. 1) Connect HART modem to both ends resistor as shown below. MRG-10 Housing HART modem Power Supply Terminal block Unit 250Ω 2) Open the software. Enter the HART modem port number and click the “set”...

  • Page 36: Negative Level Point Measurement

    MRG- - - - 10 10 10 Configuration Configuration Configuration Configuration 5.2 Negative level point measurement Value ‘C’ defines below zero level. When C values are set, the LCD or PC Hart communication will show negative values. Note: If 4mA corresponds to LV 0m, Analog output will be maintained at 4mA even if measurement values fall below LV 0m.
  • Page 37 MRG- - - - 10 10 10 Configuration Configuration Configuration Configuration To create a noise table, follow the steps below. 1) Enter Menu code [6-1], then set the noise table number (maximum10 points). 2) Enter Menu code [6-2], and set distance parameters into the data field in accordance with selected numbers.
  • Page 38 MRG- - - - 10 10 10 Configuration Configuration Configuration Configuration 5.3.3 One point advice regarding noise table input procedure It is necessary to provide some allowance around the echo peak and a margin of threshold for noise amplitude. These are +-0.3m and +5dB respectively. Noise Table point “n”...
  • Page 39 MRG- - - - 10 10 10 Configuration Configuration Configuration Configuration 5.3.4 Noise Margin When noise level is high over the whole range, the threshold level over the entire range can be set by the “noise margin” parameter as shown below. Noise margin is set at 13dB (10dB above 3dB default value) From the LCD menu, select [5-2].

  • Page 40: Volume Calculation

    MRG- - - - 10 10 10 Configuration Configuration Configuration Configuration Volume calculation There are 4 types of volume calculations which are set up by the Linearization Selection parameter. - Spherical Tank Volume is calculated from diameter, offset level and measured level.
  • Page 41 MRG- - - - 10 10 10 Configuration Configuration Configuration Configuration [3-2]. Select table address （ex. [320]), 7) Volume point must correlate to the level data defined under enter amplitude data and click ENT to complete entry. Similarly, enter data for [321]…[329]. 8) After setting all data, return to the Sub-Menu by clicking the ESC key on the LCD panel.

  • Page 42: Analog Value Compensation

    5.6 Measuring value compensation Offset level from reference point and scale factor are adjusted under [4-3] (offset) and [4-4] (scale factor). If there is a difference between the Tank ref. point and the MRG-10 ref. point, you can input “G” for calibration [1-4].

  • Page 43: Pipe Antenna Setting

    Configuration Configuration 5.9 Pipe antenna setting 5.9.1 Overview The following instructions are applicable when the MRG-10 is used in the pipe mode (hence referred to as “pipe antenna”). and disadvantages of the pipe antenna are as follows. Advantages 1) Advantages Existing pipe can be used as the pipe antenna.
  • Page 44 MRG- - - - 10 10 10 Configuration Configuration Configuration Configuration 5.9.3 Parameter setting 5.9.3.1 Antenna Type （Menu code:[1-1]） Use actual antenna type. (ex. 4inch cone antenna) 5.9.3.2 Span calibration • As the speed of microwaves propagated inside of pipes differ from the speed of microwaves when propagated in free spaces, a compensating coefficient must be input in the “Span Calibration”...

  • Page 45: Key Parameter List

    MRG- - - - 10 10 10 Configuration Configuration Configuration Configuration 5.10 Key Parameter List Menu Sub Menu Lowest Menu Title Parameters Sub Parameter Input Value Code Code Code CONFIGUR [1--] Output Parameter [1-1] 0: Level ATION 1: Ullage 2: Volume(%) 3: Current 4: Amplitude 5: Max.
  • Page 46 MRG- - - - 10 10 10 Configuration Configuration Configuration Configuration Menu Sub Menu Lowest Menu Title Parameters Sub Parameter Input Value Code Code Code VOLUME [3--] Linearisation Selection [3-1] 0: Not Calculate 1: Horizontal Cylinder 2: Spherical 3: Vertical Cylinder 4: User Tank Table Linearisation Point Number [3-2]...

  • Page 47: Technical Information

    MRG- - - - 10 10 10 Technical Information Technical Information Technical Information Technical Information 6 Technical Information System Operating frequency • 5.8 GHz Half-power beam width • 4 " Cone antenna: 34 deg • 6 " Cone antenna: 22 deg •...
  • Page 48 MRG- - - - 10 10 10 Technical Information Technical Information Technical Information Technical Information Averaging time 1..120 s Signal on alarm Hold/Low(3.9mA)/High(22 mA) Load Minimum load for HART communication 250 ohms. R0≦(Vin-16)/0.022 21.5 Load[Ohm] Accuracy Measured error * ) ±10 mm (0.4") Linearity * ) ±10 mm (0.4")
  • Page 49 MRG- - - - 10 10 10 Technical Information Technical Information Technical Information Technical Information Harmonized standard 61000-4-2 (1995)+A1(1998)+A2(2001) EN 61000-4-3(2006) EN 61000-4-4(2004) EN 61000-4-5 (1995)+A1(2001) EN 61000-4-6 (1996)+A1(2001) EN 61000-4-8(1993)+A1(2001) EN 60079-0(2006) EN 60079-11(2007) EN 60079-26(2004) Cable Connection Cable type Shielded twisted pair Cross-section area of cable: 0.2..2.5 mm 2 , (AWG24..14)

  • Page 50: Troubleshooting

    MRG- - - - 10 10 10 Troubleshooting Troubleshooting Troubleshooting Troubleshooting 7 Troubleshooting SYMPTOM ACTION No level reading Check the power supply. Incorrect level reading Check the gauge calibration. Check that gauge has not locked on an interfering object. Check for correct mechanical installation. Serial Communication failure Check the COM port setting in the LR setup program.
  • Page 51 T.Kinoshita T.Kinoshita S.Takatsuka S.Takatsuka...
  • Page 52 ¢ ¡ ¤ £ ¦ ¥ § ¡ © ¨   £         ! # " $  % ' & $ ( Safety Instructions Microwave Radar Gauge MRG-10 IMQ 08 ATEX 003 II 1/2 GD II 2 G Ex ia IIC T4...
  • Page 53 Category This equipment is certified for installation in category 1/2GD. And it has various antennas. For use rod antenna covered by Teflon, category is limited only in 2G. Gas group and Temperature class This equipment may be used with flammable gases and vapours with apparatus groups IIA, IIB & IIC, and with temperature classes T1, T2, T3, &...
  • Page 54 Intrinsically safe parameters 93mA 650mW negligible uF negligible mH Installation conditions The associated apparatus shall be linear type, with an internal limiting resistor of 300 ohm minimum. This equipment is not insulated from earth due to the use of surge/light protection provided by installation. Degree of Protection This equipment, if correctly installed, have an ingress protection rating IP65.
  • Page 55 Microwave Radar Gauge MRG-10 Safety Instructions May 2009 1st Edition Control Division I 2-16-46, Minami-Kamata, Ohta-ku, Tokyo 144-8551, Japan TEL: +81-3-3737-8621 FAX: +81-3-3737-8665 Web: http://www.tokyo-keiki.co.jp/ Copyright 2009 by TOKYO KEIKI INC. All rights reserved. (Specifications are subject to change without notice.)

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