Keiki MRG-10 User Manual

Document No.: KF05-001G

MRG-10

User’s Guide

User’s GuideUser’s Guide

User’s Guide

( i )

Safety Cautions

The caution message shown in the User’s Guide is defined as follows:

!!!!

CAUTION

Indicates that incorrect usage may result in death or
serious injury to the operator.

!!!!

CAUTION

Indicates that incorrect usage may result in injury to the
operator or damage to the equipment

.

Warning

Caution

Warning label

Warning label

WARNING

!

Don't open
lower nut if
tank is
pressurised
or contains
hazardaous
product.

( ii )

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

The contents of the User’s Guide are very important. Carefully read the entire

manual.

(2) Store the User’s Guide in safe location.

The User’s Guide is very important for the operation of the equipment. Store the
manual in a safe and accessible location. The storage location and person
responsible for maintaining the Guide should be considered carefully.

(3) Ensure that the User’s Guide is supplied to the operator of the equipment.

The representative or dealer of this equipment must supply this User’s Guide to
the user who will actually operate the equipment.

(4) The User’s Guide should be replaced if it is lost.

If the User’s Guide is lost, contact the representative listed on the back cover. A
new manual may be purchased.

Restrictions and cautions necessary to maintain the equipment

The following items must be observed to ensure that the equipment is maintained
properly. Refer to the pages corresponding to each topic for details. The
corresponding pages are shown in ( ) brackets.

(1) Do not drop unit or subject unit to impact.
(2) Use the unit in appropriate temperature environments.
(Refer: p.6-2 Operating condition)
(3) Use the unit under appropriate process temperature and pressure.
(Refer: p.6-2 Operating condition)
(4) Always use an appropriate power supply.
(Refer: p.6-1 Power Supply voltage)
(5) Do not loosen union nut when tank is pressured.
(Refer: p.2-5 Mounting the cone antenna)

( iii )

Contents

About this manual

1.Product Description 1-1

1.1 Features 1-1

1.2 Measuring principle 1-1

1.3 MRG-10 measuring system 1-2

2.Mechanical Installation 2-1

2.1 Requirements 2-1

2.2 Dimensions 2-4

2.3 Tools 2-5

2.4 Mounting Cone Antenna 2-6

2.5 Mounting Rod Antenna 2-8

2.6 Installation Hints 2-10

3.Electrical Installation 3-1

3.1 Connection of MRG-10 3-1

3.2 Cables 3-2

3.3 Load 3-2

3.4 Power Supply 3-2

3.5 Grounding 3-2

3.6 Arrester replacement 3-3

4.Configuration method 4-1

4.1 Display Panel & Key SW 4-1

5.Configuration 5-1

5.1 Basic Settings 5-1

5.2 Negative level point measurement 5-3

5.3 Avoiding Disturbance Echoes 5-3

5.4 Volume calculation 5-7

5.5 Analog value compensation 5-8

5.6 Measuring value compensation 5-8

5.7 Bottom recognition 5-9

5.8 Other 5-9

5.9 Pipe antenna setting 5-9

5.10 Key Parameter List 5-11

6.Technical Information 6-1

7.Troubleshooting 7-1

Appendix

Control Drawing for ATEX

Safety Manual

( iv )

About this manual

This User’s Guide provides information about mechanical and electrical

installation of the 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.

Chapter 1 reviews some basic concepts of radar based level gauging.

Chapter 2 describes how to assemble a gauge and how to mount it onto a tank.

Chapter 3 describes electrical installation.

Chapter 4 describes configuration method by key SW.

Chapter 5 describes how to configure for tank conditions.

Chapter 6 provides technical information.

Chapter 7 lists some typical problems that might occur and suggestions on how

to solve them.

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Product Description

Product DescriptionProduct Description

Product Description

1-1

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.

MRG-10 uses 5.8GHz low power pulsed microwave. It provides good measurement stability,
because propagation of microwaves is not affected by temperature, pressure or gas conditions in
tank.

1.1 Features

MRG-10

MRG-10 needs only a two-wire cable for power supply and output signal.

Communication

MRG-10 incorporates HART

®

protocol function which superimposes a digital output signal on the

4-20mA current output signal. Settings can be made by a HART

®

communicator or PC-based setup

software.

Volume calculation function

Volume calculation function is based level measurement of the remaining liquid in the tank and the
formula takes into consideration three tank configurations - spherical, vertical cylinder and horizontal
cylinder. There is also an applicable user-defined 20-step table.

1.2 Measuring principle

The MRG-10 level gauge utilizes the time-of-flight
measurement principle involving short microwave pulses.
Installed at the top of tanks, it emits short microwave pulses
toward liquids or pastes in the tank. Reflected microwave signals
from the surface are received by the antenna, and processed by
electronics. The time from transmission to reception is
determined by the microprocessor and converted as distance
from the transmitter to the liquid surface (ullage) with output of
the calculated level from the measured ullage (Level = Tank
Height – Ullage).

Ullage

Level

Liquid Surface

Bottom

Tank

Height

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1-2

1.3 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.

Example Connection from power supply unit to MRG-10 mounted in non-hazardous area

HART

modem

MRG-10

Voltage

source

Load

>250Ω

4...20mA

2

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2-1

2 Mechanical Installation

2.1 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. We
recommend that the transmitter be mounted so that the antenna tip is located at least 0.6 m from the tank
wall.

Socket requirements

The antenna tip should extend past the nozzle (10 mm or
more).

If the antenna tip is located inside the nozzle, echo
disturbances may be generated which will negatively affect
measurement performance.

Free space requirements

The transmitter should be mounted so that no obstacles are
present in the radar beam.

Obstacles in the radar beam may reduce the measuring
range.

Half Power Beam Width.

Diameter of radiated area (m).

Antenna

Tip

Half-power

beam width

10mm

or more

600mm
or more

Antenna Type

Half Power Beam Width

(Degrees)

4” cone 34

6” cone 22

8” cone 17

Rod 30

Distance

5m

10m

15m

20m

Antenna Type

Distance[m]

4”cone 6”cone 8”cone Rod

5m 2.9 1.9 1.5 2.7

10m 5.8 3.8 3.0 5.4

15m 8.8 5.7 4.4 8.0

20m 11.7 7.6 5.9 10.7

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2-2

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
range or accuracy and make the
transmitter more sensitive to echo
disturbances. We recommend that the
transmitter be mounted so that the
antenna tip is located at least 0.6m from
the tank wall.

Socket requirements

There are 2 inactive zone lengths
(100mm and 250mm). Noise
reflections from the nozzle are avoided in
these zones. Nozzle height must be
less than the antenna extension.

Free space requirements

The transmitter should be mounted so that no obstacles are present in the radar beam. Obstacles in the
radar beam may reduce the measuring range.

2.1.3 Key factors for measurement

1. The strength of the microwave reflection from the liquid surface is proportional to the dielectric constant
Er (Epsilon) of the target fluid. The higher the fluid’s dielectric constant, the wider the measurable range.

2. A larger antenna enables more stable measurement and a wider measuring range.

3. Compared to calm fluid surfaces, measuring ranges of turbulent surfaces are reduced due to poorer
reflection.

4. Deposit buildup on the antenna, foaming on liquid surfaces, powder granules in air suspension and
other interior tank conditions may affect measuring range and performance.

5. Obstructions in the microwave radiating area or target fluid surface areas less than the radiating area
will reduce microwave reflection and decrease and narrow the measurable range.

Inactive Zone

NPT 1 1/2

Height of nozzle

10mm or more

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2-3

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.

Calm surface

4"Cone 6"Cone 8"Cone

0

10

20

0

10

20

0

10

20

0

10

20

a b c a b c a b c

(m)

Rod

a b c

Turbulent surface

4"Cone 6"Cone 8"Cone

0

10

20

0

10

20

0

10

20

0

10

20

a b c a b c a b c

(m)

Rod

a b c

a) Dielectric constant 1.9 - 4.0 Oil, gasoline and other hydrocarbons,

petrochemicals

b) Dielectric constant 4.0 - 10 Alcohol, concentrated acids, and organic

solvents

c) Dielectric constant >10 Water

-based liquids, dilute acids and acetone

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2-4

514

* 250

176

226

148

NPT 1 1/2

176

226

148

NPT 1 1/2

364

*100

148

φ38

Rod Short

Rod Long* : Extended Part

148

238

176

106

226

346

φ215

φ265

φ188

φ140

φ92

φ154

φ52

4" Cone Antenna

6" Cone Antenna

8" Cone Antenna

2.2 Dimensions

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

*: Part extension

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2-5

Flange

The MRG-10 gauge is mounted with a flange of the following specifications

:

Cone antenna Rod antenna

Maximum thickness : 29mm (ANSI Class-150 8” ).

2.3 Tools

The following tools are needed for installation of MRG-10:

• Hexagon socket screw keys(-4)

• Adjustable wrench (for locking nut)

• Pipe wrench (for neck of cone antenna)

• Screwdriver (-) width 3mm

NPT 1 ½
Threaded

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2-6

2.4 Mounting the cone antenna

!!!!

Warning

Do not damage the PTFE seal and O-ring during mounting. Damaged seals may cause gas leakage
when the MRG-10 is installed on pressurized tanks.

1. Check and confirm the parts described below which are required for installation of the cone antenna.

2. Mount the flange on top of the cone plate.
Secure the flange with the locking nut.

Make sure that the nut is fitted tightly to the flange.

!!!!

Warning

Make sure that the bottom side of the flange is flat and all
parts are clean and dry as problems related to this may
result in gas leakage when the MRG-10 is installed on
pressurized tanks.

Transmitter

Locking
Nut

Cone
Antenna

O-ring

Seal

Union Nut

Set Screw(M4)

Flange

Nuts & Bolts

Gasket

65

φ59

Locking
Nut

Flange

Cone
Antenna

Note!
No gasket on
top of this plate.

Cone Plate

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2-7

Transmitter

Union Nut

Set Screw

O-ring

Sleeve

Antenna
Adapter

!!!!

Warning

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.

3. Carefully insert the antenna adapter of the transmitter into the sleeve.
Secure the antenna adapter with the union nut.
Make sure that the antenna adapter fits inside
of the cone antenna.
Secure the union nut with the set screw.

4. 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.

!!!!

Warning

Do not loosen the union nut when the tank is pressurized.

Gasket

Tank
Nozzle

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2-8

2.5 Mounting rod antenna

!!!!

Warning

Do not damage antenna. Damaged antenna may cause gas leakage if the MRG-10 is installed on a
pressurized tank.

NPT 1 1/2

Flange
（NPT 1 1/2

）

Gasket

Nuts & Bolts

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2-9

Fix rod antenna to flange

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.

NPT 1 1/2

Flange

NPT 1 1/2

Nuts & Bolts

Gasket

Tank nozzle

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2-10

2.6 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.

1. Thin pipe or ladder

Microwave reflections from elongated metal objects
such as thin pipes or ladders rungs are largest when
the axis of such objects are in parallel with the
electric field. The orientation of the electric field
generated by the MRG-10 is as shown in the right
figure.
Mount the MRG-10 so that the electric field is not in
parallel with the axis of the obstacle which reduces
the affect of the false echo emitted by it.

Ladder rungs Ladder rungs

Pipe

Pipe

EEEE

A-plane

A-plane

Top view

Pipe

Pipe

EEEE

A-plane

A-plane

Top view

Correct

Wrong

Ladder

EEEE

A-plane

A-plane

Top view

EEEE

A-plane

A-plane

Top view

Correct

Wrong

Ladder Ladder

Ladder

Cone AntennaFront Cover

EEEE

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2-11

2. Shoulders and Struts

Install a reflector (flat metal plate) above
the obstacle as shown in the figure.

!!!!

Warning

Measuring range may be reduced if there are obstacles
in the radar beam.

3. Center of the Tank

When the MRG is installed at the center of the tank, measurement may be adversely affected or
become unstable because of microwave side-lobes (non-main beams). Thus center-of-tank
installations should be avoided.

4. Narrow Channel

In case of channel applications, install the MRG so the axis of the electric field is at right angle to the
channel wall to avoid influences from edge reflections off channel walls and the liquid surface.

Correct Wrong

Shoulder

Correct

Wrong

Shoulder

Reflector

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2-12

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.

Round wall tank Flat wall tank

6. Open area Installation

This is an example of an open area installation.
In these types of applications, install the MRG so the axis of the microwave beam is perpendicular to the
liquid surface.

Fixing bracket

Beam area

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3-1

3 Electrical Installation

3.1 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.
The gasket provides sealing between the housing and front cover and as such the
front cover should be securely and firmly screwed onto the case.

1. Unscrew and remove the front cover.

2. Pass the cable through the entry and connect it to the terminal block.

3. Connect the shield to the ground terminal.

4. Replace the front cover and firmly screw it onto the case.

Ground

Terminal

Terminal block

+
+

-

-

Ground

Terminal

Keys

LCD

+
+

-

-

HART

modem

Power
Supply

Unit

Terminal block

250Ω

-

+

MRG-10
Housing

R

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3-2

3.2 Cables

Cable Use shielded twisted pair for connection.
Cross-sectional area of conductor is 0.2 …2.5mm

2

.

(AWG24 …14)

Cable entry 2×M20×1.5 (cable diameter 10mm max.)

3.3 Load

Minimum load for HART® 250Ω
Maximum load (Non-Ex) 900Ω
(EX) 540Ω

3.4 Power supply

Power (Non-Ex) 16…36VCD
(EX) 16…28VDC

3.5 Grounding

The terminal must be connected to earth ground prior to connection to any other
equipment.

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3-3

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; Remove and replace the Arrester PWB.

Step 4; Tighten the Arrester PWB fixing screw.

Step 5; Tighten the LCD panel fixing screw.
Please be sure that the LCD panel is positioned correctly.

アレスタ

基板

Arrester PWB

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Configuration method

Configuration methodConfiguration method

Configuration method

4-1

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)

4.1 Display Panel & Key SW

4.1.1 Display

Bar graph, measured data and units are
displayed during normal operation. Blinking
display of the last measured value indicates
that gauge is in search mode.

When the key SW is used in configuration
mode, the menu number or registered data
is displayed.

4.1.2 Key SW

1: ENT (Enter) key

Changes display from measurement mode to configuration mode.
Moves to the lower layer (from main menu to sub menu).
Moves the blinking cursor to the target column when changing the registered data.
Inputs data.

2: ESC (Escape) key

Changes display from configuration mode to measurement mode.
Moves to the upper layer (from sub menu to main menu).
Freezes changes to registered data.

3: △ (Up) key

Increases the main menu number and the sub menu number.
Increases the blinking column value.

4: ▽ (Down) key.

Decreases the main menu number and the sub menu number.
Decreases the flashing column value.

m

Bar graph [%] Measured value

Unit

mA

%

ft

m

ESC ENT

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Configuration method

Configuration methodConfiguration method

Configuration method

4-2

4.1.3 Examples

Example-1

When R-constant is set to 6.275m from the default value.

Step

Key

Display

1

7.956m

M

easuring level(m) (Normal operation mode)

2 E NT

[1--]

Main menu number (Configuration mode)

3 E NT

[1-1]

4

△

△

[1-2]

5

△△△△

[1-3]

6

△△△△

[1-4]

7 E NT

10.000

Default value

8 E NT

10.00 0

“ 0 ”

blinks

9

△

△

×

5

10.00 5

×

5 : Push 5 times

10 E NT

10.0 0 5

11

▽

▽

×

3 10.0 7 5

12 E NT

10. 0 75

13

△

△

×

2

10. 2 75

14 E NT

1 0

.275

15

▽▽▽▽

×

4

1 6 .275

16 E NT 1

6.275

17

▽▽▽▽

0 6.275

18 E NT

06.275

19 E SC

[1-4]

20 E SC

[1--]

21 E SC

4.231

M

easuring level(m) (Normal operation mode)

Main Menu

Sub Menu

Input Stage

Measuring

Data

ENT

ESC

G

[1-3]

R

[1-4]

CONFIG

[1--]

Output

Parameter

[1-1]

ENT

ESC

ENT

ESC

Registered

data

ESC ESC ESC

Meas.

Unit

[1-2]

Meas. Mode

Config. Mode

△

△ △

▽

▽

▽

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4-3

Example-2

When Volume point 2 is set to 2345.67m3.

Volume point can be set from 00000.00 to 99999.99.

Step

Key

Display

1

4.231

Measuring level(m) (Normal operation mode)

2 E NT

[1--]

3

△△△△

× 2

[3--]

Volume(Main menu)

4 E NT

[3-1]

5

△△△△

× 3

[3-4]

Volume point(Sub menu)

6 E NT

[320]

Volume point 1

7

△

△

[321]

Volume point 2

8 E NT

000.00

Default value

9 E NT

000.0 0

“ 0 ”

blinks

10

△

△

× 7

000.0 7

× 7

: Push 7 times

11 E NT

000. 0 7

12

▽

▽

× 6

000. 6 7

13 E NT

0000 0

14

△

△

×

5 0000 5

15 E NT

000 0 5

16

▽

▽

×

4 000 4 5

17 E NT

00 0 45 18

▽

▽

×

3

00 3 45

19 E NT 0 0

345

20

▽

▽

×

2

0 2 345

21 E NT 0

2435

22 E NT

02435

23 E SC

[321]

24 E SC

[3-4]

25 E SC

[3--]

26 E SC

4.231

Measuring level(m) (Normal operation mode)

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4-4

4.1.4 Parameter instructions

- shaded areas indicate default settings.

[1--] CONFIGURATION Settings

[1-1] Output Parameter: LCD display

Parameter Value Description

0 Level Level value from target
1 Ullage Distance between measuring reference point and target
2 Volume (%) Volume rate value (%)
3 Current Current value (mA) (4-20 mA)
4 Amplitude Signal strength (dB)
5 Max. Volume Max value of volume settings

When [ft] units are selected for “Level” or “Ullage” display, parameter range is calculated in ‘feet’.

[1-2] Antenna type

Parameter Value

0 4 inch cone
1 6 inch cone
2 8 inch cone
3 Rod antenna (inactive SHORT)
4 Rod antenna (inactive LONG)

[1-3] Measuring Unit

Parameter Value Description

0 m

Sets display in Metric units

1 ft

Sets display in Feet units

Note: When ‘Measuring Unit’ is changed, units of other parameters also change.

[1-4] G parameter （distance between flange reference point and measuring reference point）

Parameter Default Value Description

-3.000-3.000

0.000

R+C-G ≦ 20

(Parameter range in metric [m] units)

If measurement unit is [ft], display will be converted to show ‘feet’ units.

[1-5] R parameter （Measurement range）

Parameter Default Value Description

0.000-23.000

0.000

R+C-G ≦ 20

(Parameter range in metric [m] units)

If measurement unit is [ft], display will be converted to show ‘feet’ units.

[1-6] C parameter （Below measurement range）

Parameter Default Value Description

0.000-10.000

0.000

R+C-G ≦ 20

(Parameter range in metric [m] units)

If measurement unit is [ft], display will be converted to show ‘feet’ units.

[1-7] H parameter （Deadband）

Parameter Default Value Description

0.000-23.000 0.103 (4 inch cone)

0.223 (6 inch cone)

0.343 (8 inch cone)

0.350 (Rod Long)

0.500 (Rod Short)

Parameter range in metric [m] units

If measurement unit is [ft], display will be converted to show ‘feet’ units

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4-5

[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.

[2--] ANALOG Settings

[2-1] Analog output parameter

Parameter Value Description

0 Level Level value

converted

to 4-20 mA

1 Ullage Ullage value

converted

to 4-20 mA

2 Volume Volume value

converted

to 4-20 mA

3 Amplitude Signal strength amplitude value converted to 4-20 mA

[2-2] Minimum output (4 mA)

Parameter Output

Default Value

Description

-3.000-23.000 Level 0.000 Parameter range in metric [m] units

-3.000-23.000 Ullage 0.000 Parameter range in metric [m] units

0.000-100.000 Volume 0.000 [%]

0.000-100.000 Amplitude

0.000 [dB]

When [ft] units are selected for “Level” or “Ullage” display, parameter range is calculated in ‘feet’.

[2-3] Maximum output (20 mA)

Parameter Output

Default Value

Description

-3.000-23.000 Level 20.000 Parameter range in metric [m] units

-3.000-23.000 Ullage 20.000 Parameter range in metric [m] units

0.000-100.000 Volume 100.00 [%]

0.000-100.000 Amplitude

100.00 [dB]

When [ft] units are selected for “Level” or “Ullage” display, parameter range is calculated in ‘feet’.

[2-4] Alarm selection

Parameter Value Description

0 High output 22 mA alarm output
1 Low output 3.9 mA alarm output
2 Hold output Hold last value

[2-5] Fixed current output setting

Parameter Value Description

0 Measuring Value [mA]

3.900-22.000

Fixed current Any current value selectable

MRG

MRGMRG

MRG----1111００００

Configuration method

Configuration methodConfiguration method

Configuration method

4-6

[3--] Volume Setting

[3-1] Linearization Selection

Parameter Value Description

0 Not Calculated
1 Vertical Cylinder
2 Spherical
3 Horizontal Cylinder
4 User Tank Table

Tank Configurations

[3-2] Linearization Point Number

Parameter Default Value Description

0-20 0 Input required

no. of points for table

[3-3] Level point （ [300] ~ [319] ）

Parameter Default Value Description

-3.000-23.000

0.000 Parameter range in metric [m] units

If measurement unit is [ft], display will be converted to show ‘feet’ units

[3-4] Volume point （ [320] ~ [339] ）

Parameter Default Value

Description

0-99999.99 0.000

Display will be converted to the volumetric unit setting under [3-9].

If you create a volumetric table incorporating settings [3-2] ~ [3-4], you can produce a line chart
such as that shown below which enables you to quickly calculate level and volumetric values.

3

2

1

4

19

20

[300] [301] [302] [303] [318] [319]

[320]

[321]

[322]

[323]

[338]

[339]

Volume point Number on [3-2]

Volume table on [3-4]

Volume

Level

Level table on [3-3]

Level and Volume correlation on the user tank table

1: Vertical Cylinder

2: Spherical

3: Horizontal Cylinder

MRG

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MRG----1111００００

Configuration method

Configuration methodConfiguration method

Configuration method

4-7

[3-5] Delete all tables

Parameter Value Description

0

Do not delete

1 Delete all

Setting “1” clears table

[3-6] Diameter of the tank

Parameter Default Value Description

0.000-10.000 1.000 Parameter range in metric [m] units

If measurement unit is [ft], display will be converted to show ‘feet’ units.

[3-7] Length of the tank

Parameter Default Value Description

0.000-20.000 1.000 Parameter range in metric [m] units

If measurement unit is [ft], display will be converted to show ‘feet’ units.

[3-8] Offset level

Parameter Default Value Description

-3.000-23.000

0.000 Parameter range in metric [m] units

If measurement unit is [ft], display will be converted to show ‘feet’ units.

Diameter

1:

Vertical Cylinder

R

G

Offset

Diameter

2:

Spherical

R

G

Offset

Length

Diameter

3:

Horizontal Cylinder

R

G

Offset

[3-9] Volume unit

Parameter Value

0 m3
1 Gallons
2 Barrels
3 Ft3

MRG

MRGMRG

MRG----1111００００

Configuration method

Configuration methodConfiguration method

Configuration method

4-8

[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.

[4-2] 20mA Calibration

Parameter Default Value Description

15.00-25.00 20.00

In fixed current output mode with current set at 20mA, input
ammeter reading.

[4-3] Offset Calibration

Parameter Default Value Description

-1.00-1.00 0.00 Parameter range in metric [m] units

If measurement unit is [ft], display will be converted to show ‘feet’ units.

[4-4] Span Calibration

Parameter Default Value

0.90-1.10 1.00

[5--] Advanced Setting

[5-1] Averaging Time

Parameter Default Value Description

1-120 10 Measuring value is averaged in accordance with

[sec] setting

[5-2] Noise Margin

Parameter Default Value Description

0-10000 300 Noise is eliminated in accordance with [1/100dB]

setting

When noise level is high, noise can be masked by attenuating the signal gain.

[5-3] Search Delay

Parameter Default Value Description

1-120 30

Time delay after loss of echo until restart in accordance with
[sec] setting.

[5-4] Alarm Delay

Parameter Default Value Description

1-120 30

Time delay after loss of echo until alarm sounds in
accordance with [sec] setting.

10

24

Signal Amplitude

[dB]

14

Set noise margin
as 10.00dB

Noise

Signal Amplitude

[dB]

MRG

MRGMRG

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Configuration method

Configuration methodConfiguration method

Configuration method

4-9

[5-5] Bottom Window

Parameter Default Value Description

0-0.5 0.3 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".

[5-6] First Echo Flag

Parameter Value Description

0 Max Echo Max strength echo defined as surface echo
1 First Echo First echo defined as surface echo

[5-7] Bottom Visible

Parameter Value Description

0 Bottom Visible When tank bottom echo is larger than surface echo

(such as with oil fluids). Effective against echo
misdetection.

1 Bottom Invisible

When tank bottom echo is smaller that surface echo
(such as with water). Setting “1”, invalidates this
function.

Measurement Range (R)

Peak detectable range

Bottom window

Surface echo Bottom echo

Distance

Detected as Surface echo
at First Echo setting

Detected as Surface echo
at Max Echo setting

Signal Amplitude

MRG

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MRG----1111００００

Configuration method

Configuration methodConfiguration method

Configuration method

4-10

[6--] Noise

[6-1] Noise table number

Parameter Default Value Description

0-10 0

Input required no. of points for table

[6-2] Noise table （ [600] ~ [609] ）

Parameter Default Value Description

0.000-20.000 0.000 Noise position by distance
Parameter range in metric [m] units

If measurement unit is [ft], display will be converted to show ‘feet’ units.

[6-3] Amplitude threshold（ [610] ~ [619] ）

Parameter Default Value Description

0-10000 0 [1/100dB]

If you create a noise table incorporating settings [6-1] ~ [6-3], you can produce a line chart such
as that shown below which enables you to eliminate lower signal strength noises below the line.

Amplitude at distance 0m and 20 m is set at 0 dB as default.

[6-4] Delete All

Parameter Value Description

0

Do not delete

1 Delete All

Setting “1” clears noise table

Distance

[600]

[601]

[602]

[603]

[604] [605]

[610]

[611][614]

[612][613]

[615]

[616]

[606]

Signal Amplitude

Setting amplitude
through [6-3]

Setting distance
through [6-2]

3

2

1

4

5

6

Noise table points

7

MRG

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MRG----1111００００

Configuration method

Configuration methodConfiguration method

Configuration method

4-11

[7--] Other

[7-1] Password: not normally used

[7-2] Re-search

Parameter Value Description

0
1 Research

Mandatory surface echo re-search

[7-3] User Reset

Parameter Value Description

0
1 Initialization Initialized by “1” setting

[7-4] Error Status

Indication Error status

E-00 No error
E-01 Internal ROM Error
E-02 Internal RAM Error
E-03 Transmission error
E-04 Amplitude detection malfunction
E-05 Volume table error
E-99 Echo search status

[7-5] Software Version

[7-6] Hardware Reset

Parameter Value Description

0
1 Reset

Setting “1” executes hardware reset

MRG

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Configuration

ConfigurationConfiguration

Configuration

5-1

5 Configuration

5.1 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.

- R Set the distance from ref. point to level zero.

- C Set the distance from level zero to bottom of tank.
(‘C’ is normally set to ‘0’. If it is necessary to measure

negative level, please set the distance.)

- H Set the distance from ref. point to measurement range.
(see 5.2.1)

Parameters of tank dimensions are optimized for your application.

Ref. Point

R C Level

Ullage

Fluid

surface

Zero Level

Bottom

H

Measuring

Range

- Analog Output Parameter Select measurement value output for analog output.

- Minimum Output Set value corresponding to 4mA.

- Maximum Output Set value corresponding to 20mA.

- Alarm Selection Set value to be output when the gauge misses the echo.
Low(3.9mA), High(22mA) or Hold Last Value

MRG

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10 10

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Configuration

ConfigurationConfiguration

Configuration

5-2

Configuration with PC software

- PC connection

PC configuration software can also be used for commissioning.

1) Connect HART modem to

both ends of resistor as shown below.

2) Open the software. Enter the HART modem port number

and click the “set” button. When communication is completed successfully, ID, Version
No and Product Name will appear in the boxes.

3) By selecting other tabs such as the sample below, you can set any parameter. Any action
requires “READ” parameters from the main unit, before changing values (pressing the
“ENTER” key may be required to set value changes) and clicking “WRITE” to the main
unit.

Configuration Setting Tab Analog Setting Tab

+
+

-

-

HART

modem

Power
Supply

Unit

Terminal block

250Ω

-

+

MRG-10
Housing

R

Click Here

MRG

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Configuration

ConfigurationConfiguration

Configuration

5-3

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.

5.3 Avoiding disturbance echoes.

There are two ways to avoid the disturbance echo problem.

5.3.1 Dead Band (=”H”)

When there are disturbance echoes in the near zone such as stairs at the top of the tank,
the gauge may capture and interpret these echoes as coming from the liquid surface.
Set up “H” to avoid this problem.
All echoes within this area would be outside of the measuring range and ignored.

5.3.2 Noise Table

If there are disturbance echoes in the effective measuring range and the gauge tracks such
echoes, set up “Noise Table” parameters.
You can adjust the threshold level for sections of the measurement range with these
parameters.
“Noise Table” parameters are comprised of ullage points and threshold values. Up to 10
points of values can be established respectively with linear interpolation between points.
(Amplitude at distance 0m and 20 m is set at 0 dB as default.)
If disturbance echoes are tracked, you should first check the ullage and the amplitude level
with the LCD display or with the configuration software.

MRG

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10 10

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Configuration

ConfigurationConfiguration

Configuration

5-4

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. (For example, if “10” is set at [6-1], you will need to set data [600]~[609] for
distance values.)

3) Set distance data for [600], and push ENT to complete the entry. Similarly set distance values

for [601]…[609].

4) After completing input of distance values, the next step is entering amplitude values.

5) Return to the sub-menu by clicking the ESC key. Then enter Menu code [6-3] and set threshold
level parameters into the data fields in accordance with selected numbers. For example, if “10”
is set at [6-1], you will need to set data [610]~[619] for amplitude values.)

6) Amplitude points must

correlate to the distances defined under

[6-2]. Select table address（ex.

[610] and enter amplitude data, then click ENT to complete the entry. Similarly, set amplitude
data for [611]…[619].

7) After setting all data, return to the Sub-Menu by clicking the ESC key of the LCD panel. When

returning to the main menu, click ESC again. Click ESC again to go to the measurement mode.

Note: When using PC configuration software, enter all data into the following menu then click “WRITE”.

Setting of distance data must be in ascending order, that is, from shortest to longest distance. Noise table error
and noise table malfunction will occur if settings are mis-ordered. Error status will appear under [7-3]

Example of a noise table is shown above. All noise lower than the noise threshold line will be ignored.

1

2 3

4 5

6 7

8

[60 0]

[601]

[602]

[603]

[604]

[605]

[606]

[607]

[610]

[611][612]

[613][614]

[615][616]

[6167

Signal Amplitude

Distance

Noise Table

Surface Echo

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Configuration

ConfigurationConfiguration

Configuration

5-5

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” must also be nearer than next Noise Table point “n+1”. If this rule is not
maintained, noise table errors will occur and this function will become invalid.

Also by using the PC configuration software, you can add or change the position of the noise
table with a right click.

1) On the “Tank Spectrum” tab, when the “START” button is clicked, you may view the red line
wave form data from the main unit as shown below.

2) If you would like to set the noise table manually, right click and select “ADD” at designated
points for the new table. Also the table (points) can be moved by a left-click and dragging.

3) After the noise table is set, click the “Noise Write” button to complete.

5 dB

- 0.3m +0.3m

Signal

Amplitude

Distance

Peak Point

Peak Position

Right Click Option

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Configuration

ConfigurationConfiguration

Configuration

5-6

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].

With the PC configuration software, please refer to [5-2] under the “5. Advance” tab.

MRG

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Configuration

ConfigurationConfiguration

Configuration

5-7

5.4 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. Diameter is the diameter of the sphere and offset level is
the measurement level compensation factor.

- Vertical Cylinder Tank

Volume is calculated from diameter, offset level and measured level.
Diameter is the diameter of the tank and offset level is the
measurement level compensation factor.
.

- Horizontal Cylinder Tank

Volume is calculated from diameter, length, offset level and
measured level. Diameter is the diameter of the tank and
offset level is the measurement level compensation factor.
Length is the horizontal length of tank as shown.

- Tank Table

Set up Linearization Point Number.
It is possible to set up 20 points each for level and volume respectively in the Tank Table
which are linearly interpolated between points.
More than two points must be input to set up the Tank Table. (Tank Table Error)
Four volume units can be selected - cubic meter, gallons, barrels and cubic feet.

To create the volume table, follow the steps below.

1) Select “4” for menu code [3-1].

2) Set the required number of point settings for menu code [3-2]. (Max 20 points.)

3) Enter menu code [3-3]. Select point and set level parameters into the data field in accordance

with the selected numbers. (e.g. when setting 20 points at [3-2], [300]~[319] can be set.)

4) Input Level data then click ENT to enter values for [300] ~ [319].

5) After completing input of Level data, the next step is entering the Volume data.

6) Return to the sub-menu by clicking the ESC key. Then enter Menu code [3-3], and set the

volume parameters into the data fields in accordance with the selected numbers. (e.g. when
setting 20 points” at [3-2], [320]~[329] can be set.)

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Configuration

ConfigurationConfiguration

Configuration

5-8

7) Volume point must

correlate to the level data defined under

[3-2]. Select table address（ex. [320]),

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. To
return to the main menu, click ESC again. Click ESC once more to go to the measurement
mode.

Note: When using PC configuration software, enter all data in the following menu then click

“WRITE”.

Setting of distance data must be in ascending order, that is, from shortest to longest distance.
Volume table error and volume table malfunction will occur if settings are mis-ordered. Error
status will appear under [7-3]

3

2

1

4

19

20

[300][301] [302] [303] [318] [319]

[320]

[321]

[322]

[ 323]

[338]

[339]

Volume table points

Level

Volume

Level table points
on [3-3]

Volume data
on [3-4]

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Configuration

ConfigurationConfiguration

Configuration

5-9

5.5 Analog value compensation

When analog output current is not correct, revise the value in the following manner.
Input “4.000mA” under “Fixed Current Output” [2-5], then input the measured current value
under “4mA Calibration” [4-1].
Input “20.000mA” under “Fixed Current Output” [2-5], then input the measured current value
under “20mA Calibration” [4-2].

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].

5.7 Bottom recognition

Tank bottom recognition is necessary for measurement of low reflection targets such as oil
surfaces. In such cases, the smaller amplitude echo from liquid surface reflections is
concealed in the larger echo from the tank bottom and the gauge can not distinguish the
surface reflection echo from the bottom echo. “Bottom Visible Flag” and “Bottom Window”
parameters of the gauge function to avoid the tracking of bottom echoes. Initial settings of
these parameters are “On” and “0.3m”.
The gauge outputs level value as the bottom level, when the surface echo is in the bottom
window. However when the level is higher and the surface echo is not in the bottom window,
the gauge can distinguish surface echoes from bottom echoes. On the other hand, if bottom
echoes cannot be discerned in high reflection targets such as water, the “Bottom Visible Flag”
parameter should be set at “Off” to eliminate any bottom deadband.

5.8 Other

5.8.1 Echo search methods

Two echo search methods are available - one based on recognizing the echo of maximum
signal strength (Max. Echo Flag) and the other where the first echo in the measurement range

is captured (First Echo Flag).
The “First Echo Flag” provides a means to recognize the surface echo from other echoes in
the measuring range.

5.8.2 Reset

Initializes all setting values.

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Configuration

ConfigurationConfiguration

Configuration

5-10

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”).

Advantages

and disadvantages of the pipe antenna are as follows.

1) Advantages

Existing pipe can be used as the pipe antenna.
Even if obstacles are located near to the beam area, measurement will not be affected.
Measuring coverage can be extended to low dielectric constant liquids.

2) Disadvantages

Material of the pipe (metal, etc.) must be that which can contain and channel microwaves.
Dirty, dusty conditions inside of the pipe may cause noise disturbance echoes which
decrease accuracy.

5.9.2 Pipe antenna specifications

Specifications
Antenna size 4B Cone antenna
Measurable Range 10 m
Accuracy

±10 mm (< 5 m)
±20 mm (< 10 m)

Pipe specification (metal pipe only) ID over 100mm
Max hole for air vent（per 1 m） φ5 mm / 2pcs

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Configuration

ConfigurationConfiguration

Configuration

5-11

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” parameter (Menu code, [4-4]).

• “Span Calibration” values are

derived from the inner diameter of the pipe.

The following table is one example.

Inner Pipe Dia [mm] Span Calibration

107 0.9507

• When span calibration value (‘F’) is unknown, ‘F’ can be calculated from two points ­reference level value (X) and measured level value (Y) - using the following equation.

F =（Y

High

- Y

Low

）/（X

High

- X

Low

）

F : Span calibration value
X

High

: High reference level value

X

Low

: Low reference level value

Y

High

: High measured level value

Y

Low

: Low measured level value

5.9.3.3 Offset compensation

・Offset setting may be required using Menu code: [4-3].
・Offset value is

derived from the difference in measured level and reference level at 1 point.

5.9.4

Considerations

• Pipe material should be metal.
In cases of existing pipes of concrete or PVC material instead of metal, span calibration may
not be required as their low dielectric constants allow transmission of microwaves. However
when wet, such pipe materials exhibit high reflectivity characteristics from wetted surfaces.
This affects accuracy and span calibration becomes necessary. Because of such changes
in characteristics under wet conditions, non-metal pipe applications are not recommended.

• Air vents (10mm dia.) for pressure release should be incorporated and located above the tip
of the antenna.

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Configuration

ConfigurationConfiguration

Configuration

5-12

5.10 Key Parameter List

Antenna Type [1-2]

0: 4inch Horn Antenna
1: 6inch Horn Antenna
2: 8inch Horn Antenna
3: Rod Antenna Short
4: Rod Antenna Long

Meas. Unit [1-3]

0: meter
1: feet

G [1-4]

-3 to +3m,
(R+C-G) <=20m

R [1-5]

-3 to +23m,
(R+C-G) <=20m

C [1-6]

0 to +3m,
(R+C-G) <=20m

H [1-7]

0 to +23m

Offset of level value on LCD [1-8]

-99.999 ～ 99.999 m

Analog Output Parameter [2-1]

0: Level
1: Ullage
2: Volume(%)
3: Amplitude(dB)

Minimum Output [2-2]

-3 to +23m (level, Ullage)
0 to 100 (Vol., Amp.)

Maximum Output [2-3]

-3 to +23m (level, Ullage)
0 to 100 (Vol., Amp.)

Alarm Se lection [2-4]

0: High(22mA)
1: Low(3.9mA)
2: Hold last value

CONFIGUR
ATION

[1--]

[2--]ANALOG

Title

Menu

Code

Input Value

Output Parameter [1-1]

0: Level
1: Ullage
2: Volume(%)
3: Current
4: Amplitude
5: Max. Volume

Parameters

Sub Menu

Code

Sub Parameter

Lowest Menu

Code

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Configuration

ConfigurationConfiguration

Configuration

5-13

Linearisation Selection

[3-1]

0: Not Calculate
1: Horizontal Cylinder
2: Spherical
3: Vertical Cylinder
4: User Tank Table

Linearisation Point Number [3-2]

2

to 20

Input

[3-3]

Level Point

[300]～[319] -3 to +23m

[3-4]

Volume Point [320]～[339] 0 to 99999.99

Delete All

[3-5]

E

xecute by 1

Diameter

[3-6]

0 to +10m

Length

[3-7]

0 to +20m

Offset Level

[3-8]

-3 to +23m

Volume Unit

[3-9]

0: m3
1: gal

l

ons
2: barrels
3: ft3

4mA Calibration

[4-1]

3.9 to 2 2 mA

20mA Calibration

[4-2]

3.9 to 2

2

mA

Offset Calibration

[4-3]

-1 to 1m

Span Calibration

[4-4]

0

.9 to 1.1

Averaging Times

[5-1]

1 to 120sec

Noise Margin

[5-2]

0 ～ 10000 [1/100] dB

Research Delay

[5-3]

1 to 120sec

Alarm Delay

[5-4]

1 to 120sec

Bottom Window

[5-5]

0

to 0.5m

First Echo Flag

[5-6]

0: Max echo
1: First echo

Bottom Visible

[5-7]

0: Bottom Visible
1: Bottom invisible

Noise Table Number

[6-1]

0 to 10

Input

[6-2]

Noiｓe Table

[600]～[609] -3 to +23m

[6-3]

Amplitude
Threshold

[610]～[619] 0 to 100.00dB

Delete All

[6-4]

Execute by "1"

Password

[7-1]

t

o service mode

Re-Search

[7-2]

User Reset

[7-3]

E

xecute by 1

Error Status

[7-4]

Software Revision

[7-5]

Input Value

Title

Menu
Code

Parameters

Sub Menu

Code

VOLUME [3--]

Sub Parameter

Lowest Menu

Code

CALIBRATI
ON

[4--]

ADVANCE [5--]

NOISE

[6--]

ELSE

[7--]

Hardware Reset

[7-6]

MRG

MRGMRG

MRG----10

10 10

10

Technical Information

Technical InformationTechnical Information

Technical Information

6-1

6 Technical Information

System

Operating frequency • 5.8 GHz

Half-power beam width • 4 " Cone antenna: 34 deg

• 6 " Cone antenna: 22 deg

• 8 " Cone antenna: 17 deg

• Rod antenna : 30 deg

Measuring range Max. 20 m (65 ')

Serial communication HART communication

Key switch 4 keys for configuration

Display 5-digit LCD and bar graph

Power

Supply voltage 16..28 VDC(Ex) / 16..36 VDC(Non-Ex)

Specification for HART • Ripple: 47..125 Hz

• Vpp=200 mV (measured at 500 ohms)

• Max. noise: 500 Hz..10 kHz

• Vrms=2.2 mV (measured at 500 ohms)

Output

Variable Ullage / Level / Volume / Current /

Signal amplitude/Volume Max

Unit Level, Ullage : m/ft

Volume : % Current : mA

Amplitude : dB

Signal type Analog 4..20 mA, HART

Resolution • Analog: 4 μA

• Digital: 1 mm (0.04")

Update time 1 s

MRG

MRGMRG

MRG----10

10 10

10

Technical Information

Technical InformationTechnical Information

Technical Information

6-2

Averaging time 1..120 s

Signal on alarm Hold/Low(3.9mA)/High(22 mA)

Load Minimum load for HART communication 250

ohms.

Accuracy

Measured error *) ±10 mm (0.4")

Linearity *) ±10 mm (0.4")

Repeatability *) ±1 mm (0.4")

Ambient temperature effect ±0.01% / 10 K

*): Free-space reflection from flat metal surface,
ambient temperature 25 °C (77 °F),
atmospheric pressure.

Environment resistance

Ambient temperature -20..70 °C (-40..158 °F)

Storage temperature -40..80 °C (-40..176 °F)

Tank temperature -20..150 °C (-4..302 °F)

Tank pressure -0.1..1.0 MPa (-14..145 Psi)

Degree of protection IP65

Vibration resistance IEC 68-2-6 /1G

EU directive compliance

CE mark / EMC 2004/108/EC/ EN 61326-1(2006)/

EN 61326-1(1997)+A1(1998)+A2(2001)+A3(2003)

ATEX 94/9/EC

Input Voltage [V]

16

21.5

36

0 250 900

Load[Ohm]

R0≦(Vin-16)/0.022

MRG

MRGMRG

MRG----10

10 10

10

Technical Information

Technical InformationTechnical Information

Technical Information

6-3

Harmonized standard EN

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 mm2,
(AWG24..14)

Cable entry 2-M20X1.5, NPT 1/2" (cable dia. 6.5..9 mm)

Ground cable Max. 4 mm

2

Material

Transmitter Case Aluminum

Cone antenna 316L stainless steel

Rod antenna PFA (Thread part: 316 stainless steel)

Sealing parts PTFE, Viton O-ring

Certificate and Approvals

Hazardous area certification ATEX: Ex ia IIC T4Ⅱ Ⅱ1/2GD（Cone Antenna）

Ⅱ2G（Rod Antenna）

TIIS: Ex ia IIC T4

MRG

MRGMRG

MRG----10

10 10

10

Troubleshooting

TroubleshootingTroubleshooting

Troubleshooting

7-1

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.
Check the serial communication address.
Check the cable and HART modem

connections and make sure that correct cable

and resistor are used.

Display Panel window is blank Check the power supply.

Check the status of the gauge in the LCD display.
Status descriptions are as follows.

[E00] Normal Operation ­[E01] Internal Error Critical Error. Please contact service
[E02] Memory Error Critical Error. Please contact service
[E03] Receive Error No measured data. Please contact service
[E04] Tank Table Error Incorrect setting on tank table. Set up correctly.
[E05] Noise Table Error Incorrect setting on noise table. Set up correctly.
[E99] Searching Echo Conducting echo search.

BARRIER

ASSOCIATED

APPARATUS

POWER

SUPPLY

HAZARDOUS

LOCATION

NON-HAZARDOUS

LOCATION

MRG-10

Intrinsic Safety Parameters ( Ex ia IIC T4 )

Parameters
Ui <= 28V,
Ii <= 93mA,
Pi <= 0.65W,
Ci = 0,
Li = 0

Ambient Temperature Limits

-20 <= Ta <= 60 deg C

CONTROL DRAWING

2008-2-8

5198 5640

1

1

1

T.Kinoshita T.Kinoshita S.Takatsuka S.Takatsuka

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Safety Instructions

Microwave Radar Gauge

MRG-10

IMQ 08 ATEX 003

II 1/2 GD II 2 G Ex ia IIC T4

1. 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.

2. 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, & T4.

3. Mounting and wiring

Mounting and wiring operations in classified areas for explosive gas atmospheres, must be executed

accordingly to the current procedures and to the national and international standards (e.g. EN 60079-14)

only by qualified personnel specifically and completely trained.

4. Inspection and Maintenance

Inspection and maintenance of this equipment must be carried out according to the EN60079-17. Only

approved spares supplied by the manufacturer or approved agent should be used.

5. Ambient temperature range

This equipment is certified for use in ambient temperature range of -20°C to +60°C.

6. Contact with aggressive substances

If the equipment is likely to come into contact with aggressive substances, it is the responsibility of the

user to take suitable precautions that prevent it from being adversely affected, thus ensuring that the type of

protection is not compromised.

Aggressive substances: - e.g. acidic liquids or gases that may attack metals, or solvents that may affect

polymeric materials

Suitable precautions: - e.g. regular checks as part of routine inspections or establishing from the material’s

data sheet that it is resistant to specific chemicals

7. Technical data

Ratings

Power supply : 16 to 30VDC

Output : 4 to 20mA

Ambient Temp. : -20°C to +60°C

Microwave output : within 1000uV/m

Intrinsically safe parameters

Ui : 28V

Ii : 93mA

Pi : 650mW

CI : negligible uF

Li : negligible mH

8. 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.

9. Degree of Protection

This equipment, if correctly installed, have an ingress protection rating IP65.

10. Marking

This equipment with following label attached has been certified to comply with Directive 94/9/EC.

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Document No.

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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: [phone]
FAX: [phone]
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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