Instruction Manual For LEA-HP

NO.
MM202107 －
＿Instruction Manual＿
LEVEL ECHO ACE

（Radar Type Level Gauge with Gas Pressure Gauge）
＿CONTENTS＿
At the Beginning
For Your Safety
At the time of Storage and Transportation
Chapter 1 Composition
1. Composition of Level Gauging System ··············· 2
2. Principal Particulars ························································ 4
Chapter 2 Working Logic
1. Level Gauge part ································································· 8
-1. Working Theory ·························································· 8
-2. About FMCW ······························································· 9
-3. Signal Generation ····················································· 12
2. Pressure Gauge part ·························································· 14
-1. Working Theory ·························································· 14
Continue on next page.

＿CONTENTS＿
Chapter 3 Special Functions
1. Five Special Functions ···················································· 16
Chapter 4 Installation Practice
1. Caution for Installation ················································· 20
❑As to the Deck Stand ······················································· 21

❑As to the Fitting of Slant Plate
for Anti-Beam Reflection ··············· 23
2. Summary of Installation Procedure ······················· 24
3. Installation Practice ·························································· 25
Chapter 5 Confirmation of Operation
1. Outline of Operation Confirmation ······················ 28
2. Confirmation of Operation ········································· 29

＿CONTENTS＿
Chapter 6 Maintenance Inspection
1. Sensor Part（Detector） ····················································· 42
Chapter 7 Others
1. Maintenance ······································································· 48
-1. Radar Antenna ····························································· 48
-2. Pressure Pipe ································································ 49
2. When Error Code or

“0.000” indication is Displayed ··········· 55
3. Regarding to Abnormal Indication

at the Condition of Cargo Empty in Tank ····· 57
4. Trouble Shooting ······························································ 58
5. After Sales Service ···························································· 59

＿CONTENTS＿
Appendix_
Trouble Report
＿AT THE BEGINNING＿
In this instruction manual, outline of the product and installation practice for correct
measurements are described.
Therefore you are advised to read carefully this booklet in advance of safety operation.
And this booklet shall be kept at easily accessible place after reading or using.
For further easy understanding, we refer you to the drawing of the products on board.
Caution!!
The product may be damaged if it is handled wrongly.
In such case it will need to repair with cost even during warrantee period.
＿Attention!!＿
Ô There are different descriptions from the specification of this ship, because this
booklet has indicated standard apparatus including options.
Ô Actual illustration may be somewhat different from the explanation in this booklet.
Inquiry or Correspondence about Product
Service Group
Address 1-2-15 Minami-yukigaya, Ohta-ku, Tokyo
145-0066 Japan
Telephone +81-3-3726-4419
Facsimile +81-3-3726-4405
URL http://www.musasino.co.jp
E-mail service1@musasino.co.jp
(after expiry of warrantee period)
＿FOR YOUR SAFETY＿
Our product is so designed to pay attention on the safety in every respect.

However, the electric equipment is substantially dangerous causing fire or shock if it is
handled wrongly.
T
Too O
Ob bsseerrvvee WWaarrnniin
ngg
oorr C
Caau uttiioon
n
You shall read and observe Warning or Caution in
this booklet.
T
Too IIn
nssp
peecctt P
Peerriiood
diiccaallllyy
The product will be recommended to carry out
maintenance inspection for every dry-docking in
accordance with the items described on Chapter 6.
N
Noott ttoo O
Oppeerraattee iin
nTTrroou
ubbllee
When the working condition of the system seems
something wrong, or any damage is found in the
product, please inform to MUSASINO.
FFoorr U
Unnu
ussu
uaall N Nooiissee,,
A
Abbn
noorrm
maall S
Smmeellll oorr S
Smmook kiin
ngg
At the first, turn off power to Control Panel or Cargo
Control Console. Then please inform to MUSASINO.
AT THE TIME OF STORAGE
AND TRANSPORTATION
Attention during Storage
1.
All material shall be kept at the place satisfying the following
condition, until fitting on board.
➊ Weather-proofing covered place
➋ Under the temperature between 0 to 50 deg. C
(32 to 122 deg. F), and dry space, not to sweat.
2.
At the time of stocking the detectors to the hull, to be making sure
water tight for the lid and cable gland of terminal box to prevent
water ingression to the terminal box of the detectors.
Attention during Transportation
1.
Material shall be transported avoiding rain, and handling with
care from shock for storage and installation on board shall be
done.
2.
At the time of after installing the detectors to the hull, to be
making sure water tight for the lid and cable gland of terminal box
to prevent water ingression to the terminal box of the detectors.
Chapter 1
Composition
- 1 -
Chapter 1, Composition
1. Composition of Level Gauging System
The system is composed of Sensor Part (Detector), Control Part & Indicator Part and
Barrier.
The Sensor will be located on upper deck on board, Control Part & Indicator Part and
Barrier will be built in the console stand at the Cargo Control Room.
Electric cable used between sensor and signal processing part shall be of seven cores of
multi cable, and limited in length less than 300m.
☝Point
As for both the Control Part & Indicator Part and the Barrier, please see the Instruction
Manual of the separate volume.
- 2 -
1. Composition of Level Gauging System
Block Diagram
Level Gauge part Puressure Gauge part
Radar Antenna Pressure　Sensor
Microwave
Transmitter
＆　Reciever
Sensor part
Frequency　Mixer
＆　VCO
A/D・D/A A/D
Signal　Processor Signal　Processor
Signal　I/F Signal　I/F
to Barrier
- 3 -
2. Principal Particulars
PART ITEM PARTICULARS
Frequency Modulated Continuous Wave

Method
（FMCW）
Frequency 9.5 to 10.5GHz（X-band）
Beam Angle 11 degrees
Level Gauge
Measuring
0.5 to 22m
Range
Resolution 1mm
Measuring ±5mm at factory test

Accuracy ±20mm at onboard test
Measuring
-10 to +30kPa
Range
High pressure alarm:

Alarming Within -10 to 0% at set point.
Accuracy Low pressure alarm:
Within 0 to +10% at set point.
Pressure Gauge It is within ±5% of alarm point.

【 example 】
Measuring If the high pressure alarm point is 21.0kPa at
Accuracy the positive pressure range: ±1.05kPa
If the low pressure alarm point is -7.0kPa at
the negative pressure range: ±0.35kPa
Indicating ±0.1 digit at kPa unit

Accuracy ±0.01 digit at bar unit
- 4 -
2. Principal Particulars
PART ITEM PARTICULARS
Power Source 100/200V AC or 110/220V AC
Signal
Serial digital signal
Transmission
Weight 21kg approx.

whole of the
Sensor Part Operating -25 to +70℃
Temperature (-13 to +158)
Protection Class IP66
Anti-explosion
Ex ia IIC T5
Class
- 5 -
- 6 -
Chapter 2
Working Principle
- 7 -
Chapter 2, Working Logic
1. Level Gauge part
-1. Working Theory
The former pulse type radar has decided distance to the target by measuring the time of
returning microwave reflected by the target after it is transmitted to in a moment.
In reference with the sketch, the time of microwave going to the target and back will be
shown as follows;
2R
T =
C
Where R is a distance to the target, and C is a speed of light.

From the above formula, the distance R can be decided when time T is measured.
As above explanation, the pulse radar is to measure a distance in the time domain.
When the pulse radar is utilized for tank level measuring, its system shall be capable to
measure rather short distance with high accuracy where is important range to raise
accuracy because there is a level of topping up of the tank.
So that the system will become sophisticated to keep resolution even.
On the other hand, the system adopted in our product is of frequency sweep method to
measure distance in the frequency domain, which has succeeded to make system simple.
- 8 -
1. Level Gauge part
-2. About FMCW
The system consists of transmitter and receiver of radar wave as well as general pulse
radar method. Transmitter is an emitter of X-band (a range of 10GHz) generated by
Voltage Controlled Oscillator (VCO), and Antenna is of flat shape micro strip type.
The receiver adopts the method to decide the distance to the target from frequency
spectrum which is obtained from high speed Fourier transformation (FFT) processing after
amplifying beat signal (in the region of audio frequency) of transmitted and received
frequencies at the diode mixer circuit.
Fig.1 Transmitting Frequency
On Fig.1, real line shows transmitting frequency and dotted line shows receiving
frequency returned after reflected from the target.
Transmitting frequency varies continuously between frequency f1 and f2 in the sweep
band width B during the sweep time between t1 and t2.
Receiving frequency returns late to the radar antenna from the target after some time.
However, the system does not concern about this time delay, ∆t = 2R/C, and utilize the
fact that the frequency difference ∆f between transmitting and receiving is proportional to
the distance to the target.
2R B
∆f = ×
C T
☝Point
i.e. ∆f will be defined the above formula.
- 9 -
1. Level Gauge part
-2. About FMCW
If there is only one target at the distance R, the frequency difference ∆f shows a certain
sine curve in all domains of sweep time T. In another word, it means that at the time t, the
frequency difference between transmitting and receiving of radar wave which is returned
a little bit late is constant at anytime during the time between t1 and t2.
Fig.2 Difference between Transmitting & Receiving Waves
The frequency difference, ∆f shall be of lower frequency in case of returning from near
distance and higher frequency in case of returning from far distance. In any cases, those
frequencies are of audio obtained from frequency analysis of Fast Fourier Transform, and
converted to the distance.
Fig.3 Transformation from Frequency to Distance
- 10 -
1. Level Gauge part
-2. About FMCW

The frequency difference, ∆f is not so simple sine curve because the reflection does not
come only from tank content surface but also from various material in the tank such as
hull structure, pipes, ladders, etc. of different distance.
Fig.4 General Wave Pattern
Although wave pattern of the frequency difference, ∆f consists of various frequency

component as ∆f shown on Fig.4, the signals corresponding to the distance from major
objects will be obtained as shown on Fig.5 after FFT frequency analysis.
Fig.5 General Distance Information
Amplitude of signal in Fig.5 is proportional to the strength of reflected wave so that the
accuracy is raised up by presuming maximum amplitude being as the reflection from the
content surface in this system, and the others are controlled simply as noise.
- 11 -
1. Level Gauge part
-3. Signal Generation
Explanation of the wave distribution on Fig.5 will be added hereunder-referring Fig.6.

Total distance measured by radar wave is one between lower surface of fitting flange of
Detector and liquid surface in the tank. Ullage shall be calculated from such total distance
less Antenna Offset. On the other hand, tank depth shall be reduced Bottom Offset, and
then Level will be obtained after further reduction of Ullage.
☝Point
As Antenna Offset and Bottom Offset are known figures, they will be memorized CPU in
advance.
Fig.6 Example of Application
- 12 -
1. Level Gauge part
-3. Signal Generation
In general, wave distribution obtainable tank seems like an example as shown on Fig.7, in
which clutter is observed caused by double bounce between radar antenna and process
seal, reflection of wave from near structures at the upper side in the tank, etc.
Peak behind liquid surface is a reflection from tank bottom or structures located below
liquid surface, which usually occurs by radar wave penetration into low dielectric constant
liquid such as petroleum, gasoline, etc.
Fig.7 General Distribution of Wave Pattern
☝Point
X-axis on Fig.7 could be understand Distance (R) from radar antenna instead of Frequency
(∆f).
- 13 -
2. Pressure Gauge part
-1. Working Theory
The Pressure Sensor is installed into the Terminal Box of the Detector.
The Sensor detect a various pressure of tank ullage by semiconductor type pressure
transducers, and translate the pressure to various voltage.
Semiconductor Type Pressure Transducers

➊ A semiconductor's piezoresistive properties are utilized for a principle of this
transducer.
➋ A 4×3×1.7mm size pressure sensing element is presented as a complete silicon chip
component. One side of the chip is etched into a thin diaphragm.
➌ In a diaphragm four resistors are formed by an impurity diffusion technique.
There four resistors have piezoresistive properties, resistance to change with stretching
or compression.
➍ Up-setting the balance of the whetstone bridge, consist of four resistors.
With constant current excitation the bridge-output is an increasing or decreasing
voltage, proportional to various pressure acting on the diaphragm.
Output
The output voltage is proportional to various pressure acting on the diaphragm.

It is defined the difference in the output voltage between the full rated pressure and no
pressure, about 100mV for rated voltage.
A laser trimmed thick film resistor is provided to compensate the thermal error.
Cross-section View Electrical Schematics
- 14 -
Chapter 3
Special Functions
- 15 -
Chapter 3, Special Functions
1. Five Special Functions
This system contains five special featuring functions follows;
1
To cut noisy Clutter observed nearby Antenna
2
To cut Clutter caused by Internal Objects in the Tank
3
To eliminate Multi-bounced signals
4
To track level or target automatically
5
To check own functions by self-diagnosis
- 16 -
1. To cut noisy Clutter observed nearby Antenna

Reflected wave from object other than the measuring target is called Clutter, and it is an
irregular signal equivalent to the noise in radar type level gauging.
Clutter will act to deteriorate the accuracy of measurement. Therefore the Clutter shall be
minimized by signal processing.
Returned signal reflected within 0.5m from Antenna, usually range of Deck Stand above
deck will be cut by the filter to eliminate Clutter of closed region.
2. To cut Clutter caused by Internal Objects in the Tank

There are many undesirable reflections of transmitted radar wave by the internal fittings
and hull structures in the tank.
Those Clutters will interfere in the accuracy of the level measuring, so that the processor
has once memorized them in advance, and correct the measurement corresponding to the
level.
3. To eliminate Multi-bounced signals

Microwave transmitted from radar antenna will bounce from the level to the tank top and
return after bounced again at the level forming Double Echo.
Further it may grow up to the continuous multi-bounced wave.
Especially when the tank top forms with curvature, S/N ratio becomes poor because
multi-bounced signal may become stronger than the real level signal after converged of
radar wave by effective reflection. Such multi-bounced signal will be removed by Echo
Check function to judge whether any correct signal exists nearby it with a distance of 1/n
(n is integer) supposing once as multi-bounced signal of largest amplitude being correct
signal.

- 17 -
4. To track level or target automatically

Processor of the level Detector may lose sometime the real target because of weaken level
reflection and strengthen other reflection than level due to rough surface of the tank level
or hull listing by external effect, etc.
To recover such unexpected situation, Processor has the function to regard the reflection
within certain range nearby the level moment before as the current level.
However it does not drift to the wrong target and follow up if such situation has returned
as before within short period, i.e. 30 sec.
5. To check own functions by self-diagnosis

When either missing target, dropped receiving sensibility, weakened reflected strength
from the target or strengthened relatively other reflection than the level, the alarm of
“Poor Receiving Sensibility” will be raised.
When Sensor Part becomes something wrong, or data transmission between components,
Error Code will be displayed on each indicator, other than indicator at CPU.
☝Point
As to Error Code, please refer to Chapter 7.
- 18 -
Chapter 4
Installation Practice
- 19 -
Chapter 4, Installation Practice
1. Caution for Installation
1.
Full attention shall be paid to locate the Detector far from horizontal surface of horizontals
or face plates of bottom transverses, girders and/or longitudinal frames for minimizing
influence to the radar beam.
＿Attention!!＿
When there are horizontal members such as face plates of longitudinal members nearby
bottom within working area of radar beam, it is necessary to fit the slant plates of about
20 deg. to the bottom on the face plates for avoiding influence of reflected radar wave
from there.
2.
If tank bottom is inclined 2.5 deg. and more, reflected wave does not returned direct to
Antenna when being tank empty, and Detector may not recognize the tank bottom. For
such tank, reflection plate of approximately 300mm by 300mm shall be fitted at the
extreme bottom of the tank, making a right angle with a center of radar beam.
Area of reflection plate shall be different case by case of tank size.
3.
In case of loading cargo of petroleum family such as crude oil, kerosene, naphtha or others,
a part of radar wave will pass through them by due to their low dielectric.
When Level is coming down to the bottom, mixture of a reflected wave from content
surface and a returned wave from tank bottom after penetrated content will cause
unstable of measuring accuracy. So that the measuring lowest level is forced to indicate
Zero Level by offset at certain depth preventing mis-reading.
＿Attention!!＿
When Zero Level is indicated, please confirm whether the residual content has become
empty or not yet by your eyes.
- 20 -
As to the Deck Stand
Detector will be fitted usually on Deck Stand at each tank, which shall be fabricated by the
shipyard. The referential information is provided below.
1. Height of Deck Stand: 700mm（Standard）

☝Point
Flange surface of Deck Stand shall be higher than 700mm above maximum loading
level.
2. Inclination of Fitting Flange: less than ±1 degree to horizontal even keel

☝Point
To ensure the measuring accuracy, Detector shall be fitted less than the above degree.
＿Attention!!＿
When the inclination of Fitting Flange has exceeded the above standard as a result of
fitting work of Deck Stand on tank top, it shall be corrected with intermediate
adjusting flange.
3. Pipe size of Deck Stand

JIS 250A（Sch80） or equivalent, prepared by the shipyard.
☝Point
Ô Pipe size shall be chosen not to obstruct transmission of radar beam.
Ô In case of Deck Stand of 700mm high, net clearance inside of pipe shall be 237mm dia.
Minimum.
４. Pipe size of Maintenance Hole

JIS 150A（Sch80） or equivalent, prepared by the shipyard.
The size might be different according to the shipyard.

- 21 -
As to the Deck Stand
Inclination of Fitting Flange:

less than ±1 degree to
horizontal even keel
180 mm
700mm
230 mm
min.
mm
- 22 -
As to the Fitting of Slant Plate for Anti-Beam Reflection
Radar wave transmitted from Antenna of Detector has a beam angle of ±5.5 deg.
＿Attention!!＿
When there are horizontal members such as face plates of longitudinal members nearby
bottom within working area of radar beam, it is necessary to fit the slant plates of about
20 deg. to the bottom on the face plates for avoiding influence of reflected radar wave
from there.
Tank Depth
1.03m 10m
2.00m 20m
Beam
Radius
2.96m 30m
Slant Plate: 20 deg.
Bottom
Longitudinals
Tank Bottom
- 23 -
2. Summary of Installation Procedure
The installation work of the system shall be carried out in accordance with the following
procedure.
1
Confirmation of Power Source
2
Selection of Installation Place
3
Installation
☝Point
To read carefully following 1.Caution for Installation.
Some important cautions, Deck Stand and needs of Slant Plate for Anti-Beam Reflection
are described.
- 24 -
3. Installation Practice
1. Confirmation of Power Source

To confirm whether the voltage of ship’s power supply is same with it stipulated on the
name plate of Control Panel or Cargo Control Console.
☝Point
The voltage of ship’s power supply will be 100/110Vac by 50/60Hz or 200/220Vac by
50/60Hz as standard.
Caution!!
When the voltage of ship’s power supply is different from it on the name plate, Power
source circuit in Control Part may be possibly burnt.
Please inform to MUSASINO the fact if the voltages are different mutually even though
Power source circuit is assembled in accordance with the specification.
2. Selection of Installation place

To select the Installation place of Detector in reference with the following conditions
during design stage.
➊ To be less wave in the tank.

➋ To be no fittings such as pipes, ladders, etc. within radar beam area.

- 25 -
3. Installation Practice
3. Installation
To install the Detector carefully in reference with the following notices.
Sensor Part（Detector）
① To place gasket underneath of Fitting Flange of Detector.
② To take an adequate measure to avoid an erosion between Deck Stand and Detector.
Caution!!
When wiring in Detector, Cable gland and Earthing terminal shall be loosened,
but the other parts of Detector shall not to be opened for prevention of gas leaking,
in which Inert gas (Nitrogen gas) is filled.
Cable
① The deck cable shall be of MPYCY-7 or MPYCYS-7, and limited in 300m as
maximum.
Shield
① Shield of every twisted cable shall be gathered and grounded at Earthing Terminal of
Barrier unit as being one point earth.
Earthing
① Earth conductor of Barrier unit to the hull shall have a sectional area of 2mm2 and
more.
＿Attention!!＿
Earthing of Barrier unit shall be made sure, in accordance with the requirement of
the Standard for Intrinsically safe structure.
- 26 -
Chapter 5
Confirmation of Operation
- 27 -
Chapter 5, Confirmation of Operation
1. Outline of Operation Confirmation
The operation of the system shall be confirmed in accordance with the following
procedure.
1
Confirmation on Installation
2
Confirmation of Control Part & Indicator Part
3
Confirmation of Wiring
4
Measurement Confirmation Test
5
Pressure Alarm Working Test
☝Point
Being carried out in the shop, Measuring Accuracy Test may be omitted on board. The
above Measuring Confirmation Test, however, shall be carried out on board by service
engineers of MUSASINO as an operation confirmation test.
- 28 -
2. Confirmation of Operation
1. Confirmation on Installation
① Confirm that names on Tank Name Plate agree with the respective actual tank names.
② Confirm that RF unit Manufacturing No. attached to Detector agrees with the one
attached to Indicator Part.
③ Confirm that Detector is securely earthed through Deck Stand.
④ Conform that Cable Gland is securely tightened for waterproof.
2. Confirmation of Control Part & Indicator Part

① Confirm that there is no abnormal smell when turning on power supply for Control
Panel or Cargo Control Console.
② Confirm with a circuit tester that the specified power voltage is being supplied.
③ Confirm that necessary Caution Plates are attached to Control Panel or Cargo Control
Console.
3. Confirmation of Wiring
① Confirm by Continuity Test that cables are correctly connected between Detector and
Barrier.
② Confirm that Barrier is correctly earthed.
③ Confirm that shields of cables are adequately earthed.

- 29 -
4. Measuring Confirmation Test

① Carry out Measuring Confirmation Test.
Put the folding type Target in the tank through Maintenance Hole on Deck Stand,
compare the measured Target distance with figure on Indicator of Level Gauge to
determine correctness of the Level Gauge.
Warning!!
Never try to transmit radar wave to open air with Detector removed from Deck Stand.
It is against Radio Law.
☝Point
This system is limited to be used only within enclosed space.
② Put Cover Plate back onto Maintenance Hole after completion of Distance Measuring
Test.
＿Attention!!＿
Take necessary actions to secure air-tightness before putting back Cover Plate onto
Maintenance Hole.
Warning!!
The service engineer will put the special MUSASINO seal onto Detector after
completion of operation confirmation.
If the seal is removed or broken, MUSASINO will not warrant any failure in the
system.
- 30 -
5. Pressure Alarm Working Test

＿Attention!!＿
Observe the following procedure for the “Check before Cargo Loading on Pressure
Alarm”.
Locate assistants at all places near the Detector to be tested and Indicator to provide
pressure alarm (such as Cargo Control Console).
Before Working Test
●Work for Detector

Tools Prepared
Spanner
Simple Test Special Tool and Adjustable Wrench
(within the Special Tool Box)
☝Point
Assemble parts of operation Simple Test Special Tools referring to the
illustration of the Special Tool List in the Product drawing.

- 31 -

Before Working Test

1. Record the gap, remove the Connection Bolt, remove the Clamp Belt, and
open the Cover.
☝Point
Before loosening the Clamp Belt, record the amount of gap between both ends
of the Clamp Belt by measuring with a ruler, or by marking both end
positions of the Clamp Belt on the Cover with a felt pen so that the tension
applied to the Clamp Belt can be the same as before disassembly.
Pay attentions to the following points.
ⅰ） Be sure to fit the o-ring back to the original sealing position.
ⅱ） Check the o-ring for any damage, before re-assembly.
ⅲ） Wipe off smear or dirt, if any, from O-ring contacting areas, with a dry cloth.
ⅳ） Attach the Clamp Belt after locating the Detector body and the Cover
to the correct positions.
Make sure that the Clamp Belt is properly located before tightening it.
ⅴ） When re-using the Clamp Belt after opening the Cover for test,
tighten the Connection Bolt to the same extent as before.
When using a new Clamp Belt, tighten the Connection Bolt to a
torque of approximately 5.0 N・ｍ.
ⅵ） Do not perform this work under bad weather.
Avoid rain and rough sea for trouble-free.
Tighten the Connection Bolt

to make this gap the same
as before disassembly.
Clamp Belt
- 32 -

Before Working Test

2. Remove nuts and washers that fix pressure pipe valve locking piece, and turn
the Valve locking piece to Shut side.
＿Attention!!＿
Be careful not to lose washers.
Valve Locking Piece

“Open side”

Valve Locking Piece
“Shut side”
Continue on next page
- 33 -

Before Working Test

3. Remove the Plug.
＿Attention!!＿
Be careful not to lose plug.
Plug
- 34 -

Before Working Test

4. Install the Simple Test Special Tool in the plug attaching position.
☝Point
The Simple Test Special Tool is screwed in to be attached.

- 35 -

＿Attention!!＿
Ô Pay attention to keep the test pressure normally less than 100kPa, and never let it
exceed 200kPa in any case.
☝Point
Excessive pressure may damage Sensors.
Ô Contact us for malfunction of alarm or calibration to be serviced by our service
engineer. See “At the Beginning” page for contact information.
1. Working Test for High Pressure Alarm

① Increase pressure on the pressure sensor with syringe (of Simple Test Special Tool) until
the meter (of Simple Test Special Tool) reading reaches the high pressure alarm point.
☝Point
Confirm the High Pressure Alarm Point at the Acryl Name Plate.
ぶReference
See the product drawing, “Acryl Name Plate” for details.
② After the pressure has reached the above alarm point, close the valve of the meter.
③ Confirm with Indicator that the High Pressure Alarm works normally.
☝Point
At the same time, confirm that the buzzer related to the above alarm also works.
2. Working Test for Low Pressure Alarm

① Reduce pressure on the pressure sensor with syringe (of Simple Test Special Tool) until
the meter (of Simple Test Special Tool) reading reaches the low pressure alarm point.
☝Point
Confirm the Low Pressure Alarm Point at the Acryl Name Plate.
ぶReference
See the product drawing, “Acryl Name Plate” for details.
② After the pressure has reached the above alarm point, close the valve of the meter.
③ Confirm with Indicator that the Low Pressure Alarm works normally.
☝Point
At the same time, confirm that the buzzer related to the above alarm also works.
- 36 -

After Working Test

A Tool Prepared
Sealing tape
1. Remove the Simple Test Special Tool.

2. Wrap around the Plug newly with the sealing tape, and then screw it into the
Pressure Pipe.
＿Attention!!＿
Wrap around the Plug screw securely with the sealing tape.
Plug
- 37 -

After Working Test

3. Set the Valve Locking Piece to Open side.
＿Attention!!＿
Be careful not to lose washers.
Valve Locking Piece

“Shut side”

Valve Locking Piece
“Open side”
4. Put washers and nuts back to their respective original positions.
- 38 -

After Working Test

5. Put the Cover and tighten the connection bolt.
☝Point
When re-using the Clamp Belt after opening the Cover for test, tighten the
Connection Bolt to the same extent as before.
ⅳ） Attach the Clamp Belt after locating the Detector body and the Cover
to the correct positions.
ⅴ） When re-using the Clamp Belt after opening the Cover for test,
When using a new Clamp Belt, tighten the Connection Bolt to a
torque of approximately 5.0 N・ｍ.

Clamp Belt
- 39 -
- 40 -
Chapter 6
Maintenance Inspection
This inspection will be recommended to carry out for every dry-docking.
＿Attention!!＿
Ô As for the Control Part & Indicator Part and the Barrier, please see the
Instruction Manual of the separate volume.
Ô This inspection work shall not be carried out when raining or wet time
of 80% RH and more.
Ô This inspection shall start after making sure of “OFF” the Power Switch
on Control Panel or Cargo Control Console.
ÔAsk our company if there is an unclear point in the way of exchanging it,
others, the exchange part.
Please inform to MUSASINO in reference with “At the Beginning”.
- 41 -
Chapter 6, Maintenance Inspection
1. Sensor Part（Detector）
Inside of Terminal Box
☝Point
Record the gap, remove the Connection Bolt, remove the Clamp Belt, and open the Cover.
Ö Before loosening the Clamp Belt, record the amount of gap between both ends of the
Clamp Belt by measuring with a ruler, or by marking both end positions of the Clamp
Belt on the Cover with a felt pen so that the tension applied to the Clamp Belt can be the
same as before disassembly.
ⅳ） Attach the Clamp Belt after locating the Detector body and the Cover to the correct
positions.
ⅴ） When re-using the Clamp Belt after opening the Cover for maintenance, tighten
the Connection Bolt to the same extent as before.
When using a new Clamp Belt, tighten the Connection Bolt to a torque of
approximately 5.0 N・ｍ.

Clamp Belt
- 42 -
Inside of Terminal Box
● To confirm neither sweat by humidity nor seawater immersion after

opened cover plate on Casing.
➟ If any watery condition is found in Terminal Box, it shall be dried using soft waste
or paper, and then the insulation between each terminals and hull shall be checked
by Digital Multi-meter.
● To confirm there is no wire disconnection.

➟ If any wire disconnection is found, then repair it to connect properly.
● To confirm there is no loosened Terminals or Setscrews with

Screwdriver.
➟ If any loosened is found, then tighten it additionally.
● To confirm there is no rust anywhere.

➟ If any rust is found, then to scrape it until no rust remains.
● To confirm there is no crack or significant deformation in sealing parts.

➟ If any defective sealing parts is found, then replace it .
● To confirm Pressure-Pipe does not have any appearance defects

including rust, damage or crack.
➟ If it has any appearance defect, replace it.
● To confirm Pressure-Pipe is not clogged.

ぶReference Chapter 7, 1-2.Pressure Pipe
➟ If it is clogged, then clean it completely.

- 43 -
Outside of Terminal Box
● To confirm there is no appearance defect including missing, burned or

rusted part.
➟ If any missing ,burned or rusted part is found, then replace it.
● To confirm there is no foreign material including dirt and dust.

➟ If foreign material is found, then clean off by compressed air or with waste cloth.
● To confirm there is no loosened Bolt with Spanner.

➟ If any loosened bolt is found, then tighten it additionally.
● To confirm there is no defective character on each Name Plate.

➟ If any defective character is found, then please inform to MUSASINO.
Flexible Tube and Cable Gland
● To check any water leakage into Casing.

➟ If any water leaking is found, please try to find the cause after removing Gland Nut.
➊ When a part of Cable Gland, such as Packing is damaged;
Please renew the damaged part with a new one.
➋ When Cable is damaged;
Please inform to MUSASINO if it seems causing by Cable Gland.
Otherwise, please inform to the Shipyard.
● To confirm there is no loosened Nut with Spanner.

➟ If any loosened nut is found, then tighten it additionally.
● To check any damage.

➟ If any damage is found, to renew with new one.
● Check whether or not there is a surface roughening due to rusting on the

welded surface.
➟ If found any rusting, then to scrape it until no remaining rust.
● Check whether or not there is no crack or marked deformation in

Packing and others.
➟ If found any crack or marked deformation, then to renew it partially or totally.
- 44 -
Flange（Fitting Flange）
● Check whether or not there is a surface roughening due to rusting on the

welded surface.
➟ If found any rusting, then to scrape it until no remaining rust.
● Check whether or not there is no crack or marked deformation in

Packing and others.
➟ If found any crack or marked deformation, then to renew it partially or totally.
- 45 -
- 46 -
Chapter 7
Others
- 47 -
Chapter 7, Others
1. Maintenance
-1. Radar Antenna
When the ship is being loaded with crude oil requiring tank heating or filling of inert gas,
sensitivity of radar may drop with its Horn Antenna smeared with paraffin, carbon or
sludge. In that case, clean the Horn Antenna in accordance with the following procedure.
Warning!!
Never try to transmit radar wave to open air with Detector removed from Deck Stand.
It is against Radio Law.
☝Point
This system is limited to be used only within enclosed space.
1
Remove Cover Plate
from Maintenance Hole on Deck Stand
2
Wipe off paraffin, carbon or sludge
from inside of Horn Antenna with soft waste or paper
3
Put back Cover plate onto Maintenance Hole
＿Attention!!＿
Take necessary actions to secure air-tightness before putting back
Cover Plate onto Maintenance Hole.
- 48 -
Chapter 7, Others
1. Maintenance
-2. Pressure Pipe
Since a clogged pressure pipe may deteriorate sensitivity of Sensor, clean the inside of
Pressure Pipe periodically to remove smear completely.
＿Attention!!＿
When Pressure-Pipe cleaning is carried out, the tank must be open to air.
- 49 -
Chapter 7, Others
1. Maintenance
-2. Pressure Pipe
1. Remove Cover
① Record the gap, remove the Connection Bolt, remove the Clamp Belt, and open the
Cover.
☝Point
Before loosening the Clamp Belt, record the amount of gap between both ends of the
Clamp Belt by measuring with a ruler, or by marking both end positions of the Clamp
Belt on the Cover with a felt pen so that the tension applied to the Clamp Belt can be the
same as before disassembly.
Pay attentions to the following points
ⅳ） Attach the Clamp Belt after locating the Detector body and the Cover to the
correct positions.
ⅴ） When re-using the Clamp Belt after opening the Cover for maintenance,
approximately 5.0 N・m.
ⅵ） Do not perform this maintenance work under bad weather.
Avoid rain and rough sea for trouble-free maintenance.

Clamp Belt
- 50 -
Chapter 7, Others
1. Maintenance
-2. Pressure Pipe
2. Remove Plug
① Remove the Plug.
Plug
- 51 -
Chapter 7, Others
1. Maintenance
-2. Pressure Pipe
3. Clean Pressure-Pipe
＿Attention !!＿
When Pressure-Pipe cleaning is carried out, the tank must be open to air.
A Tool Prepared
Round bar (with approximately 3 mm-diameter)
① Remove smear inside Pressure-Pipe.
☝Point
Clean inside of Pressure-Pipe up to the end using a round bar or the like.
- 52 -
Chapter 7, Others
1. Maintenance
-2. Pressure Pipe
4. Put Plug back into the Pressure Pipe

A Tool Prepared
Sealing tape
① Wrap around the plug newly with the sealing tape, and then screw it into the Pressure
Pipe.
＿Attention!!＿
Wrap around the hexagon socket screw securely with the sealing tape.
Plug
- 53 -
Chapter 7, Others
1. Maintenance
-2. Pressure Pipe
5. Put Cover
① Put the Cover and tighten the connection bolt.
☝Point
When re-using the Clamp Belt after opening the Cover for maintenance, tighten the
Connection Bolt to the same extent as before.
ⅳ） Attach the Clamp Belt after locating the Detector body and the Cover to the
correct positions.
ⅴ） When re-using the Clamp Belt after opening the Cover for maintenance,
approximately 5.0 N・ｍ.

Clamp Belt
- 54 -
Chapter 7, Others

“0.000” indication is Displayed
When following Error Code is displayed, please take necessary measure in accordance
with countermeasure.
☝Point
As for the details, read the Instruction Manual of the separate volume.
Error Codes at the MDA model Indicator
LINE WITH BREAKING

ERROR CODE
or LOOSING OF WIRE
Pressure Gauge Line of 1, 3 or 4

＿
【 Countermeasure 】
➊ In case of breaking or disconnecting wire,
to replace wire or to carry out repair works for recovery of
breaking or disconnecting.
➋ In case of loosening Terminal Screw,
to tighten additionally such screw with Screwdriver.
＿Attention!!＿
When Error Code does not disappear even if the countermeasure is taken correctly,
the trouble shall be reported to MUSASINO in reference with this booklet “AT
THE BEGINNING”, as repair work will be rendered by our service engineer.

- 55 -
Chapter 7, Others

“0.000” indication is Displayed
When Error Code is displayed on each indicator, other than indicator at CPU, power
supply switch for Level Echo Ace inside Control Box or power supply to Cargo Control
Console shall be switch “OFF” once, and after about 30 sec. “ON” again.
If Error Code does not disappear by action of “OFF/ON” and system is still something
wrong, then please inform to MUSASINO.
At the time of blackout with some reason, if abnormal indication, “0.000” indication,
appeared at power on starting condition, to try to above power switch “OFF” and “ON”
procedure.
Error Codes at the MDA model Indicator
ERROR CODE POSSIBLE CAUSE
Out of range beyond Tracking Gate

＿
Abnormal Temperature
＿
- 56 -
Chapter 7, Others
3. Regarding to Abnormal Indication

at the Condition at Cargo Empty in Tank
Solid materials at empty of cargoes, such as sludge and/or mud of which has slope
surfaces, may cause error of level gauges especially for narrow tanks of which have big
structures in tanks within radar beam area, such as SLOP T., RESIDUAL T., and also big
stream by pumps, such as stream of oily water from cargo tanks after cargoes washing,
may cause error in the narrow tanks.
The Level gauges will become normal, if you clean tank bottom, and/or stop to run
pumps.
- 57 -
Chapter 7, Others
4. Trouble Shooting
When you doubt whether the system is trouble, please inspect once more in accordance
with the following procedure.
Symptom 1
The system fails to work on turning “ON” the Power Switch of Control
Panel or Cargo Control Console.
Possible Causes & Corrective Measures

1. An oversupply of power has caused a blown Fuse.
➟After ensuring there is no damage to parts in Control Panel or Cargo Control Console,
exchange it for a Fuse.
- 58 -
Chapter 7, Others
5. After Sales Service
When something is wrong, please check !!

When you doubt trouble,
please inspect the system in accordance with “Trouble Shooting”.
Still when you cannot solve the trouble,

please come to the after sales service
Still when you cannot solve the trouble, please come to the after sales service.
Please get in touch with MUSASINO, and inquire the trouble.
When you inquire about trouble, please add the following information.
1. Shipyard Name
2. Ship No.
3. Trouble, as detail as possible
☝Point
If you fill up on a copy of and send us “Trouble Report” attached at the end
of this booklet, we can respond promptly.
- 59 -
Chapter 7, Others
- 60 -
Chapter 5
Appendix
Trouble Report
＿TROUBLE REPORT＿
Service Group
Address 1-2-15, Minami-Yukigaya, Ohta-ku,
Tokyo 145-0066 Japan
Telephone +81-3-3726-4419
Facsimile +81-3-3726-4405
E-mail service1@musasino.co.jp
When and if you have any problem with our radar type level gauge, Level Echo Ace, you
are kindly requested to fill in the below and send us at the above address.
レーダー式液面計（Level Echo Ace）に不具合が起きた場合は、お手数ですが以下の項目にご

記入のうえ、弊社までご連絡ください。
Date
Owner Telephone
Ship Name Facsimile
Shipyard E-mail
Ship No. Signature
Next Port of Call
Installed Place （Name of Tank）
Kind of Cargo
℃ or 
Cargo Temp.
TH： TM： TL：
Trim m Heel m
Steady or Rolling
Condition
Loading or Discharging
Damage Alarm Lamp ON or OFF
Alarm
Error Code
Comment
Head Office
1-2-15, Minami-Yukigaya, Ohta-ku, Tokyo, Japan
Post Code: 145-0066
TEL: +81-3-3726-4411 FAX: +81-3-3726-1557
E-mail: musasino@musasino.co.jp
URL: http://www.musasino.co.jp
Shirakawa Works
Izumizaki, Nishi-Shirakawa-gun, Fukushima, Japan
Post Code: 969-0103
TEL: +81-248-53-2821 FAX: +81-248-53-2976
E-mail: musasino@ruby.ocn.ne.jp

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What are the main components of the level gauging system?

What are the main components of the level gauging system?

How does the level gauge part work?

How does the level gauge part work?

NO.

LEVEL ECHO ACE

1. Composition of Level Gauging System ··············· 2

2. Principal Particulars ························································ 4

Chapter 2 Working Logic

1. Level Gauge part ································································· 8

-1. Working Theory ·························································· 8

-2. About FMCW ······························································· 9

-3. Signal Generation ····················································· 12

2. Pressure Gauge part ·························································· 14

-1. Working Theory ·························································· 14

Continue on next page.

Chapter 3 Special Functions

1. Five Special Functions ···················································· 16

Chapter 4 Installation Practice

1. Caution for Installation ················································· 20

❑As to the Deck Stand ······················································· 21

2. Summary of Installation Procedure ······················· 24

3. Installation Practice ·························································· 25

Chapter 5 Confirmation of Operation

1. Outline of Operation Confirmation ······················ 28

2. Confirmation of Operation ········································· 29

Chapter 6 Maintenance Inspection

1. Sensor Part（Detector） ····················································· 42

-1. Radar Antenna ····························································· 48

-2. Pressure Pipe ································································ 49

2. When Error Code or

3. Regarding to Abnormal Indication

4. Trouble Shooting ······························································ 58

5. After Sales Service ···························································· 59

Continue on next page.

Inquiry or Correspondence about Product

Our product is so designed to pay attention on the safety in every respect.

Attention during Storage

Attention during Transportation

1. Composition of Level Gauging System

1. Composition of Level Gauging System

Level Gauge part Puressure Gauge part

Radar Antenna Pressure Sensor

PART ITEM PARTICULARS

Frequency Modulated Continuous Wave

Frequency 9.5 to 10.5GHz（X-band）

Beam Angle 11 degrees

Measuring ±5mm at factory test

High pressure alarm:

Pressure Gauge It is within ±5% of alarm point.

Indicating ±0.1 digit at kPa unit

PART ITEM PARTICULARS

Power Source 100/200V AC or 110/220V AC

Weight 21kg approx.

Protection Class IP66

1. Level Gauge part

-1. Working Theory

Where R is a distance to the target, and C is a speed of light.

Radar Antenna Pressure　Sensor