Oval ULTRA OVAL User manual

High Temp./Low Temp. Service and Jacketed
ULTRA OVAL
Meter Sizes 50, 52, 53, 55, 56, 57
Register type A
Every ULTRA OVAL is fabricated and shipped from our factory under stringent quality control. In order
to maintain its design performance throughout the life of the meter, this manual offers the operator the
necessary installation, operation and maintenance information.
Be well familiar with these instructions before you place the meter in service and keep this manual at the
field location for ready reference.
The standard, high temperaure-, low temperature-service, and jacketed type meters all have in common
the same specifications described in this instruction manual except for some difference in the jacketed
type on its piping procedure and operating precautions. Be careful to observe the instructions given with
a reminder "See also page 18 for the jacketed type."
◆About Meter Size Designation ◆
The size of OVAL positive-displacement flowmeters is basically identified by a two-digit code. For
complate details, see Section 18 PRODUCT CODE CONFIGURATION..
Meter Sizes 52, 53, 55, 56
with heating tube
Meter Size 57
with cooling tube
Meter Size 50
with cooling tube
Ins. No. B-144-12-E

B-144-12-E
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CONTENTS
1. BEFORE YOU BEGIN .............................................................................................................. 4
1.1 Confirming the Nameplate....................................................................................................... 4
1.2 Transportation Considerations ................................................................................................ 4
1.3 Storage Considerations...........................................................................................................4
1.4 Considerations on Construction ..............................................................................................5
2. OPERATING CONDITIONS.................................................................................................... 5
2.1 Operating Conditions for Explosionproof Model...................................................................... 6
3. GENERAL DESCRIPTION...................................................................................................... 8
4. PART NAMES............................................................................................................................ 8
5. LCD COUNTER DISPLAY ...................................................................................................... 9
5.1 About "MODE" Switch ............................................................................................................. 9
5.2 About the Displayed Messages during Operation ................................................................. 10
5.3 About "RESET" Switch .......................................................................................................... 10
6. INSTALLATIONS..................................................................................................................... 11
6.1 Piping Guidelines. ................................................................................................................. 11
6.2 Standard Installation, Horizontal Line.................................................................................... 11
6.3 Standard Installation, Vertical Line ........................................................................................ 11
6.4 Example of Faulty Piping....................................................................................................... 11
7. HOW TO CHANGE FLOW DIRECTIONS........................................................................... 12
8. WIRING INSTRUCTIONS ...................................................................................................... 13
8.1 Wiring Connections at Terminals. ..........................................................................................13
8.2 Terminal Connections ............................................................................................................ 13
8.3 Method of Connections. ........................................................................................................14
8.4 About Load Resistance Range.............................................................................................. 14
9. OPERATING INSTRUCTIONS ............................................................................................. 15
9.1 Operation............................................................................................................................... 15
9.2 Operating Precautions........................................................................................................... 16
9.3 Precautions at Operation Shutdown...................................................................................... 17
9.4 About Register Life ................................................................................................................ 17
9.5 About Meter Factor................................................................................................................ 17
9.6 Piping Instructions and Operating Precautions of Jacketed Meters...................................... 18
10. DISASSEMBLY AND INSPECTING ................................................................................. 19
10.1 Size 50 Meter Body Disassembly and Inspection ...............................................................19
10.2 Size 50 Meter Body Assembly Procedure ........................................................................... 20
10.3 Sizes 52, 53, 55, 56, 57 Meter Body Disassembly and Inspection ..................................... 22
10.4 Sizes 52, 53, 55, 56, 57 Meter Body Assembly Procedure ................................................. 23
11. REGISTER SWITCH FUNCTIONS AND PARAMETER SETUP................................. 25
11.1 Switch Names......................................................................................................................25
11.1.1 Function Setup Switch "SW2".....................................................................................26
11.1.2 Output Mode Setup Switch "SW1"..............................................................................26
11.2 Individual Test Pin Functions ............................................................................................... 27

B-144-12-E
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11.3 Accumulated Total and Instantaneous Flowrate Calculations.............................................. 28
11.4 Parameter List ..................................................................................................................... 29
11.5 Parameter Setup Procedure ................................................................................................ 31
11.5.1 Procedure to Modify a Parameter............................................................................... 31
11.5.2 Procedure to Enter a Parameter................................................................................. 31
11.5.3 About Dummy Output Features (special functions) .................................................... 33
11.5.4 Parameter Initialization ............................................................................................... 33
11.5.5 About Error Messages ................................................................................................ 34
・Table 11.2 Menu Trees and Switch Operation ................................................................... 35
12. SENSOR REPLACEMENT PROCEDURE ...................................................................... 36
13. BATTERY REPLACEMENT PROCEDURE..................................................................... 37
13.1 About the Battery................................................................................................................. 37
13.2 Battery Pack Replacement..................................................................................................37
14. TROUBLESHOOTING ......................................................................................................... 38
15. EXPLODED VIEWS AND PARTS LIST............................................................................ 39
15.1 Size 50 ................................................................................................................................39
15.2 Sizes 52 and 53...................................................................................................................40
15.3 Sizes 55 and 56...................................................................................................................41
15.4 Size 57 ................................................................................................................................42
16. GENERAL SPECIFICATIONS ........................................................................................... 43
16.1 Basic Meter ......................................................................................................................... 43
16.2 Register General Specifications .......................................................................................... 44
17. OUTLINE DIMENSIONS ..................................................................................................... 45
18. PRODUCT CODE CONFIGURATION .............................................................................. 46
NOTES ON EXPLOSION-PROOF TYPE FOR CHINA (NEPSI) ........................................ 48
CONVENTIONS
Shown in this manual are the signal words NOTE, CAUTION and WARNING, as
described in the examples below:
NOTE: Notes are separated from the general text to bring the user's
attention to important information.
CAUTION: Caution statements signal the user about hazards or unsafe
practices which could result in minor personal injury or product
or property damage.
WARNING: Warning statements signal the user about hazards or unsafe
practices which could result in severe personal injury or death.

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1. BEFORE YOU BEGIN
Every Ultra Oval is thoroughly tested before it leaves the factory. When received, it shoud be
thoroughly inspected for indication of rough handling during transit. Necessary handling precautions are
described in this section; read the instructions carefully.
As for other information, find the respective sections from "CONTENTS" on pages 2 and 3. For any
inquiries, contact your nearest Oval designated sales office.
CAUTION
When you make inquiries, include the product name, model number, stock number, ratings
and other necessary information.
Nameplate
(ratings shown)
1.1 Confirming the Nameplate
Every Ultra Oval is assembled and adjusted
according to individual specification. Product code
number and ratings are stated on the nameplate
of the register. Make sure that, by referring to the
general specifications on pages 43 and 44, and the
product code configuration on page 46, the ratings
shown conform to your particular specification.
1.2 Transportation Considerations
(1) To safeguard against damage during transit, transport your Ultra Oval to the installation site in the
same container used for transportation from the factory if circumstances permit.
(2) Ultra Oval is adjusted and inspected as an assembly consisting of the meter body, sensor and
register. It should therefore be handled as an integral assembly.
(3) The register is accurately configured and adjusted. Do not attempt to remove the front cover to gain
access to its internal assembly.
1.3 Storage Considerations
If your Ultra Oval is stored for long periods of time upon receipt before installation, unexpected faulty
conditions could result. If a long-term storage is anticipated, take the following precautions:
(1) Keep your Ultra Oval in store in the same shipping container used for transportation from Oval if
possible.
(2) Place of storage should conform to the following requirements:
★Free from rain and water.
★Free from vibration and impact shocks.
★Temperature and relative humidity in the storage place are at or near room temperature and
humidity (around 25°C and 65%).
(3) Purge the Ultra Oval that has once been placed in service with clean air, N2 gas, etc. to prevent
the metered fluid from adhering to the meter connections, piping inner walls, housing, etc. before
storage. (Wash clean with suitable detergent if necessary.)
(4) In case of storage for extended periods of time, good practice is to keep in store in the same
containers used for shipment from the factory.

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1.4 Considerations on Construction
(1) The register is of waterproof construction for
outdoor service.
(2) Do not attempt to replace component parts
with others or make any circuit modification.
(3) The pressuretight packing furnished con-
stitutes part of the flameproof construction.
Do not use any pressuretight packing
other than those furnished. The packing
union should be tightened securely upon
completion of the connections.
・With output: Product code ends with a code
other than 00...Pressuretight packing is
furnished
・Without output: Product code ends with 00...
Closeup plug is furnished
(4) Of the four different pressuretight packings
(φ9, φ10, φ11 and φ12) furnished as
standard accessories, a φ11 packing is
tentatively installed in place. Select from
these and install the one that best fits the
finished outside diameter of your particular
cable.
Table 1.1 Applicable Cable Outside Dia. Unit in mm
Packing Code Packing I.D. Cable O.D.
9 9.0 8.5 −9.0
10 10.0 9.1 −10.0
11 11.0 10.1 −11.0
12 12.0 11.1 −12.0
NOTE
Cable lead-in (pressuretight packing) is not
supplied with models of nonexplosionproof con-
struction. The customer is to supply waterproof
cable gland for this purpose (applicable screw
size G1/2). In this case take precautions against
potential entry of moisture in to the register.
CAUTION: Moisture intrusion into the
register will present a fogging-up display
window and performanse problem.
2. OPERATING CONDITIONS
To maintain the stated high accuracy and long
service life of OVAL flowmeter, make sure that
flowrate, pressure, temperature and viscosity are
within the ratings as stamped on the meter register
nameplate. Do not fail to confirm these ratings
before placing it in service.
CAUTION:
1) Although allowable ambient temperature
is up to +60°C for explosionproof units,
it is desirable that the meter be used at
room temperature and humidity.
2) In case where the register is exposed to elevated temperatures due to exposure to direct
rays of the sun or to radiant heat, ensure, by providing a sunshade or similar protection,
that the meter is used within the operating temperature range.
Register
Lead-in Fitting
(pressuretight
packing)
Made In Japan MNPJ-237
OVAL Corporation
MODEL
TAG. No MAX PRESS.
FLOW RANGE
INT. ～
CONT. ～
FULL SCALE TEMP. PULSE UNIT
SERIAL No. DATE SIZE
FLUID METER FACTOR
1. When measuring other liquids, consult us.
2. Place the meter body (outer case) in a horizontal
position. For details, see instruction manual.
NOTES

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3) This flowmeter is not provided with subtract function. If pulsation in the flow (where the
fluid moves back and forth in the pipeline under the influence of pressure) or reversal of
flow exists, the total counter may show erratic reading, accumulating all incoming pulses
irrespective of flow direction.
2.1 Operating Conditions for Explosionproof Model
This product is approved as explosionproof. Failure to comply with the following conditions will
automatically nullify this rating.
(1) Do not perform any unauthorized modification to this product.
(2) Before opening the enclosure, if necessary for some reason, ensure safety against hazards associated
with flammable gases present in the atmosphere.
(3) In case of TIIS explosionproof type used under the ambient temperature of 45℃or higher, use a cable
resistant to the temperature of 75℃or higher.
(4) Intrinsically safe rating remains valid only when no external circuit is connected to this equipment. To
use it rated intrinsically safe, do not connect it to any external circuitry.
(5) Use under ambient temperature conditions below 60°C.
(6) Metered fluid temperature must be held below 120°C.
Specification (1): Output provided (Product code ends with a code other than 00.)
Fig. 2. 1
Conn. terminals
for external wiring
Cable lead-in ※1
(w/pressure-
tight packing)
Register (ex. type)
TEM
1
2
3
4
Ext. circuit
Ext. wiring※4
specs.
0.1 μF max.
1.0mH max.
External wirings connect across 1-2 and 3-4.
(Supply voltage: 45VDC max.)
General- purpose
electrical instrument
Conn. terminals for ※3
external wiring
Hazardous area Nonhazardous area

B-144-12-E
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Specification (2): Output not provided (Product code ends in 00.)
NOTE: Detailed explanation of asterisks ※1 through ※4 in Figs. 2.1 and 2.2.
Explosionproof enclosure of the ex type equipment is represented by a code Exd II BT4/Exia II BT4. For
models with the provision of output (product code ends with a code other than 00), a pressuretight packing
※1 for cable entry is supplied as standard accessory. Flameproof rating (Exd II BT4) remains valid as long
as it is used in place.
However, because of a built-in battery pack, if supply power is removed from this state and an external
circuity ※3 is disconnected at the external circuit wiring connection terminals end, then intrinsic safety
rating (Exia II BT4) applies.
For models with no provision of output (product code ends in 00), close-up plugs ※2 (manufactured by
Shimada Electric, Model SBP-16) for cable entry are supplied as standard accessories. Intrinsically safe
rating (Exia II BT4) remains valid as long as these are used in place.
In working with models with provision of output (product code ends with a code other than 00), use cables
that link this product with a general-purpose electrical instrument (receiving instrument, etc.) which meet
the following requirements:
●Temperature rating: In case of TIIS explosionproof type used under the ambient temperature of 45℃or
higher, use a cable resistant to the temperature of 75℃or higher.
●Electrical ratings: Allowable cable capacitance 0.1 μF max.
Allowable cable inductance 1.0mH max.
※1
※3
※4
※2
※4
Conn. terminals
for external wiring
Fig. 2. 2
Cable lead-in ※1
(w/close-up plug)
Register (ex. type)
TEM
1
2
3
4
Hazardous area

B-144-12-E
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3. GENERAL DESCRIPTION
Ultra Oval has been developed to meet the needs of precise flowrate measurement. The local direct-
reading total counter is an all-electronic register built around a single-chip CPU. With latest electronic
technologies used throughout, this versatile register displays accumulated total flow, instantaneous
flowrate (digital readout) and provides, by option, a pulse and analog output proportional to the rate of
flow.
In this meter, fluid flow is detected by sensing with an amorphous sensor the magnetic fields of permanent
magnets embedded in the oval rotors. As a result, high reliability is achieved.
Features
(1) Absence of any mechanically sliding components except for Oval rotors contributes to long
service life.
(2) Small wetted parts count and pocketless design makes this meter ideally suited for flow
measurement of chemical liquids.
(3) You can monitor accumulated total flow and instantaneous flowrate locally on the digital display.
(4) When coupled with a remotely located receiving instrument, output signals can simply be used for
control, adjustment, recording, etc.
(5) Explosionproof construction offers increased safety.
(6) A nonvolatile memory retains parameters and variables in cases of power suspension and external
power interruption.
(7) Low battery alarm is among its many alarm displays.
NOTE: See Section 9.4 on page 17.
SERVICE NOTE: With the use over an extended period of time, meter error will deviate more or
less from the initial point. Upon request, we may conduct an instrumental error
testing once again and establish a "new meter factor" in the scaler when your
Ultra Oval is returned to the factory for periodic inspection or for other reasons.
4. PART NAMES
Mode Switch
LCD Counter Reset Switch
Selector Magnet
Power Cable
Entrance G1/2
Optional Cable
Lead-in (pressure-
tight packing)
[provided for ex,
type with remote output]
Front Cover
Meter Body
Flow Direction Arrow
Frange
Cooling Tube
(or heating tube)
Register
(Battery pack
incorporated)
Power
Signal

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①Accumulated Total Flow
An Accumulated total of 12345678 L is shown
here.
②Instantaneous Flowrate (b1)
An Instantaneous flowrate of 1200 L/h is shown
here.
5. LCD COUNTER DISPLAY
5. 1 About "MODE" Switch
Removing the selector magnet housed at the
bottom of the register, hold it close to the field
labelled "MODE" through the LCD counter glass
faceplate and the display will scroll forward
through available readings as shown below.
③Instantaneous Flowrate (b2)
An Instantaneous flowrate of 20.00 L/min. is
shown here.
④Resettable Total Flow
A resettable accumulated total of 34567 L is
shown here.
Accumulatedtotal
Resettabletotal
Instantaneous
flowrate:/h
Instantaneous
flowrate:/min
×1L
b1:×1L/h b2:×1L/min
×1L
b1:×1L/h b2:×1L/min
×1L
b1:×1L/h b2:×1L/min
×1L
b1:×1L/h b2:×1L/min
Modesymbol
NOTE; ※About grand total reading, see
CAUTION 3) in Sec. 2 on page 6.
Selector Magnet
Selector Magnet
"MODE"

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5.2 About the Displayed Messages during Operation
Immediately turning "OFF" (selector magnet
the window to the next one)
Holding turned ON until the last bar disappears
results in "prolonged depression" processing
(※) to takes place.
(Turning OFF before the last bar disppears
results in the same behavior as in ①to take
place.)
※prolonged operation: An operation required
for Normal mode Parameter review mode
selection, finalizing the parameter setting,
etc.
NOTE: While RESET switch is in a valid mode (resettable total mode. etc.), the same message as
stated above appears in response to RESET switch operation.
(There is no distinction between ordinary depression and prolonged depression.)
5.3 About "RESET" Switch
Only in the resettable mode, or in Mode
Symbol: " ", the accumulated total reading is
resettable.
CAUTION: Do not fail to install the selector
magnet in its holder after use lest you will not
lose it. It uses an intensive magnet; never hold it
close to floppy disks or other magnetic storage
items.
"RESET"
Indicates that the switch is turned
"ON."
Indicates a countdown before
"prolonged depression" processing
takes place.
(2) Prolonged operation
Held turned ON without turning "OFF"
immediately by removing the fingers.
Bars begin to disappear from the left most one.
(1) Ordinary operation
"MODE" switch is turned "ON"
(selector magnet held close to it.)
8 bars appear.

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6. INSTALLATION
6.1 Piping Guidelines (See page 18 for jacketed type.)
(1) Flush the piping assembly.
Flushing must be performed before meter installation. Install a short pipe in place of the meter at this
time (see diagram below).
(1) In case flow direc-
tion is from L to R,
change places of
meter and strainer.
(2) Arrange piping so as
to facilitate drainage.
(3) Strainer should be
inspected on a
regular basis.
6.4 Example of
Faulty Piping
Do not install the meter
in a position like this.
NOTE: For outline dimensions and pipe connection dimensions, see approval drawing.
(2) Install the meter free from pipe strains.
(3) The meter must be installed on the discharge side of the pump.
(4) If the meter is to be used under tank head, give a head greater than the pressure losses of the piping
system, strainer, meter, etc.
NOTE: Pressure losses of Ultra Oval and strainers are stated on the general specifications.
(5) The meter installation is correct if the flow direction conforms to the arrow mark on the meter body.
(6) The strainer should be located upstream of, and as close to the meter as possible.
(7) Since the sensor in Ultra Oval operates on the principle of sensing changes in magnetic flux density,
it must be isolated from the influence of any external magnetic flux. In order to minimize the influence
of external magnetic flux, select an installation location at least 5 meters away from existing power
equipment and conductors - potential sources of creating strong magnetic and electric fields, such as
motors and generators.
(8) In case electric heating is desired, consult the factory.
●Typical Ultra Oval Installations
6.2 Standard Installation, Horizontal Line
6.3 Standard Installation,
Vertical Line
(1) Install in the bypass line to
prevent scales falling from
top of the piping assembly.
(2) If the flow direction is from
top to bottom, change places
of meter and strainer.
Flow Direction
Valve
Short Pipe
Strainer
Bypass Line
Marked ※is the space required for disassembly
and inspection.
Bypass Line
※(1000mm)
Strainer
Register
Wrong!
IN
OUT
OUT
IN
OUT
IN
A
B

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7. HOW TO CHANGE FLOW DIRECTIONS
CAUTION: Do not fail to turn power OFF if the meter is of remote output type.
Change the orientation of the register and flowmeter body such that they agree with the actual flow
direction desired.
①Take off four hex socket head screws (M6) with hex wrench.
CAUTION
①Rotate the register assembly without sepa-
rating it from the adapter.
②Do not attempt to rotate the register
assembly more than one complete
revolution.
②Holding the register assembly in both hands,
carefully rotate it and then secure it with
hex socket head screws in line with the new
direction of flow.
NOTE: If the register has once been separated, rotated, and installed, go right back to the state
before changing the flow directions. Then, follow the correct procedure in step ②(without
separating the register assembly) again to change flow directions.
Size 50 Sizes 52, 53, 55, 56, and 57
Do not attempt to change flow directions by
separating the register assembly like this.
Register
Assembly
Rotate carefully.
Don't seperate !
Adapter

B-144-12-E
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①Take off four hex socket head bolts (M6) on
the front of register assembly and remove the
front cover.
②Removing the front cover provides access to a
4-post terminal block.
Terminal identification label is found on the
back of front cover.
③Using crimp-style terminals, ensure good
electrical connections.
NOTE:
1. Models which have no remote output and of
nonexplosionproof type are not provided with
pressuretight packing (see page 5).
2. Earth ground the Ext. GND terminal to the
instrumentation ground earth.
8. WIRING INSTRUCTIONS (Refer also to the wiring instructions of respective receiving
instrument instruction manual.)
8. 1 Wiring Connections at Terminals
(1) Cables for field wiring
The following cables should be used unless otherwise specified:
Cables l.25mm2in conductor area and 8.5 - 12 mm in finished O.D. As to the number of conductors,
select 2 to 4 according to your particular application. It is recommended that their shield be grounded at
the receiving instrument.
CAUTION: In case of TIIS explosionproof type used under the ambient temperature of
45°C or higher, use a cable resistant to the temperature of 75°C or higher.
(2) Transmission length
The maximum transmission length is typically one kilometer.
NOTE: If it exceeds one kilometer, consult the factory.
(3) Inductive interference prevention
To minimize the possibility of stray current pickup, the field wiring should be routed sufficiently away from
existing power cables or power circuits.
(4) Precautions about Wiring Connections
①The terminal block has M3.5 screw posts; use crimp-type terminal lugs that fit snugly over cable end.
②Do not fail to earth ground the preamplifier GND terminal.
③The cable should extend downward from cable entrance to prevent rainwater from traveling along it
and entering the equipment.
④If lightning strikes are anticipated, provide a surge arrestor.
CAUTION: Make sure of the validity of meter (transmitter) and companion receiving
instrument combination by referring to their model numbers, serial numbers,
etc. before you make electrical connections.
8. 2 Terminal Connections
Hex Wrench
O-Ring
Front Cover
Hex Socket
Head Bolts
Ext. GND Terminal Int. GND terminal
Remote Output
Terminals

3
2
1
4
3
2
1
4
TerminalBlock TerminalBlock
SIG
SIG
600Ω
Max.
600Ω
Max.
0V
0V
G
G
24VDC 24VDC
V
3
2
1
4
TerminalBlock
12〜45VDC
Power
Analog
Indicator
Incaseof
curentinput
＋
−
＋
−
3
2
1
4
TerminalBlock
1ms(std.)or50ms
7Vmin.
1Vmax.
SIG
0V
V12〜24VDC
Regulated
Voltage
1kΩ
10kΩmin.
3
2
1
4
TerminalBlock
Totalizer
AnalogIndicator
LoadResistor
G※
＋
−
＋
−
＋
−
PowerSupply
Capacity60mAmin.
B-144-12-E
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8.3 Method of Connection
8.4 About Load Resistance Range
In the specification of two-wire transmission
system for analog and pulse signals, the power
lines also serve as signal lines.
The transmission loop requires a DC power
supply. If it is desired to connect an instrument in
a loop, the load resistance of both the instrument
and conductors must fall within the operating
range as shown in the graph at right.
Stsndard: Power supply voltage = 24VDC
Load resistance = 250Ω
0
0
300
（600）
1650
12 （24） 45
LoadResistance(Ω)
SupplyVoltage(VDC)
Operating
Range
3
2
1
4
TerminalBlock
SIG
Max.50mA
1ms(std.)or50ms
0V
V
VDC
12〜24
E(≦30VDC)
RSelectRsuchthatthe
max.allowablecurrent
isheldbelow50mA.
(1) Current Pulse Output (2-wire system) (2) Analog Output (2-wire system)
(3) Open Collector Output (3-wire system) (4) Voltage Pulse Output (3-wire system)
(5) Current Pulse + Analog Output (4-wire system)
NOT E: OVAL ci rcuit to accept cur rent pulses comes in two
configurations as shown above. Refer to the receiving
instrument instruction manual before making connections.
NOTE: In case of voltage input, couple an external load
resistor (see the acceptable load resistance
range in Section 8.4).
NOTE 1: In OVAL receiving instruments, signal conversion
takes place with an internal load resistor. If you
build a system like the one shown here with a
commercially available totalizer of other make,
verify that the signal levels to the totalizer match,
since signal conversion from current pulses into
voltage pulses takes place according to the law
4/20mA ×load resistance.
NOTE 2: If you use an OVAL receiving instrument in the
configuration shown here, make sure of the current
carrying capacity of receiving instrument's power
suply. lf it has problem in current carring capacity, a
separate power supply should be provided for the
analog Indicator.
※Select the voltage input for the totalizer.
Make sure of the trigger level of voltage input and determine the
supply voltage and load resistance value.

B-144-12-E
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9. OPERATING INSTRUCTIONS
9.1 Operation (See page 18 for the jacketed type.)
At first-time operation, carefully operate in the following sequence, allowing the flow within the flow range
specified. (Refer to the piping diagram below.)
(1) Shut off the valve (A) on the inlet side and the valve (B) on the outlet side and then open the bypass
line valve (C) to allow the fluid in the bypass line, thereby removing weld chips, scales and other
foreign matter left in the piping assembly.
CAUTION: This is particularly important on new installations.
(2) Carefully and slightly at first, open the valve (A) upstream of the meter progressively and then, slightly
at first, open the valve (B) downstream progressively.
(3) Slowly close bypass line valve (C) and make sure that the total counter in the register advances in
response. Maintain a flowrate 10 to 20 % of the maximum flowrate (confirm it in the instantaneous
flowrate display mode) at this time, allow the flow for more than 15 minutes and make sure that air in
the piping assembly has totally escaped.
In applications where temperature exceeds 60°C, run the system at least for 30 minutes in this state
to ensure uniform heat distribution in the measuring chamber.
(4) Following the break-in operation (preheating), shut off the bypass line valve (C) completely and open
the upstream valve (A) progressively until fully open and slowly open downstream valve (B) until the
rated flow is obtained.
(5) Flowrate should be regulated with the valve (B) downstream of the meter and should be held within
the specified rate.
(6) The strainer net should be inspected for condition and cleaned on a regular basis. On a new
installation, in particular, inspect daily first and, according to the clogged condition of the net being
observed, inspection intervals may be reduced progressively to, say, once a week.
Flow Direction
Valve
Meter Strainer
Bypass Line
BA
C

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9.2 Operating Precautions
(1) When changing flowrates
In applications where the flowrate varies or
where shutoff valve opening and closure takes
place in batch operation, avoid rapid changes
in flowrate across the meter.
As a rule of thumb, one second per 25
millimeters (1") in connecting pipe diameter
is acceptable as the permissible changes in
flowrate.
Operating the meter at flowrates in excess
of the maximum allowable flowrate will nullify
the guaranteed accuracy, reduce the meter
life and may result in faulty conditions, such
as the seizure of bearings or the rotor-to-
measuring chamber contact.
(2) Where the temperature of metered fluid
changes
Avoid rapid temperature changes in the meter.
Temperature changes of the fluid in the meter
should be held within 3°C per minute.
Extra care should be used particularly when
making a flow measurement in batch operation
without the provision of heat tracing of the
piping where the fluid temperature differs from
atmospheric temperature.
If rapid temperature changes are anticipated,
heat trace the piping assembly as well as the
meter.
(3) Liquids of low steam pressure
Temperature and pressure of LPG, polyvinyl chloride monomers or anything with low viscosity and
low steam pressure that are too ready to vaporize should strictly be controlled.
During operation, the temperature of bearings in the meter is usually higher than that of the metered
fluid. Vapors around the bearings can be causes of faulty conditions, including generation of unusual
noise and bearing seizure.
(4) Corrosive liquids
When you make a measurement of highly corrosive liquids, such as nitric acid and sulfuric acid,
appropriate materials should be used for tanks and piping assembly. Heterogeneous materials
originally contained in the metered fluid or corrosive substances dissolved from tanks and pipes of
inappropriate materials may lead to costly downtime, as a result of locked rotors, for example, when
they are allowed into the measuring chamber.
Excessive flow Rapid Flow Variation
Take Precautions
Against Bearing Seizure !
Rapid Temperature
Changes

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9.3 Precautions at Operation Shutdown (See also page 18 for the jacketed type.)
(1) Valves should be closed progressively.
Rapid valve closure could, under certain piping conditions, cause a sharp pressure rise by water
hammer, or hydraulic shock, resulting in damage to the meter.
(2) Precautions against pressure buildup on closure
Complete closure of valves upstream and downstream of the meter makes the affected section a
totally enclosed chamber and a pressure buildup relative to a rise in atmospheric temperature could
lead to an unexpected damage to the meter.
(3) Liquids ready to adhere or gel at zero flow velocity
Liquids that tend to adhere and solidify or gel at flow velocities around zero must thoroughly be
washed away from the meter interior with running cleaning fluid before shutdown. Negligence of this
instruction may leave the meter as an immovable unit when the operator attempts to resume meter
operation the next time.
9.4 About Register Life
(1) Because of the life expectancy of components incorporated, such as the LCD and non-volatile
memory, the internal electronics is designed to be replaced in about 10 years. The electronics life
depends on the environment in which it is used; if any of the following operating conditions applies,
we recommend you to replace it as an assembly in five to six years:
◆High temperature environment.
◆High temperature process fluid measurement.
◆Field installation with widely varying temperatures.
◆LCD counter display is exposed to the direct rays of the sun.
◆Frequent process fluid flows and interruptions.
(2) Models with optional battery pack have a storage life of 10 years approx. after shipment, whether the
battery is consumed or not. In other words, even in applications where the register is powered from
an external source for most of the time and the battery current drain is considered negligibly small,
battery replacement is yet required due to its storage life.
Storage life may be reduced even more under such adverse environmental conditions as:
◆High temperature environment
◆High temperature process material measurement
◆Cold region
9.5 About Meter Factor
If it is desired to change meter factors in an instrumental error testing, for example, you may establish a
new meter factor by the following procedure.
Instrumental error testing must be conducted with proper facilities and procedures specified in the
Weights and Measures Law, Japanese Industrial Instruments Federation, JIS standards, etc.
◎How to Determine a New Meter Factor
E
New Meter Factor = (Current meter factor) ×(1 −−−−) (mL/P)
100
where current meter factor: Stated in the test report or on the nameplate of the product.
E: Instrumental error determined in the test (%)
IMPORTANT: The new meter factor should be put on paper for later reference.
NOTE: See 11.5 Parameter Setup Procedure (page 31) to review/modify meter factor.

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9.6 Piping Instructions and Operating Precautions of Jacketed Meters
◆Hot water or steam jacketed meters require piping work in the following manner:
(1) Piping to the meter body remains the same as that of standard meters (meters not jacketed).
(2) Adhere to the following instructions for the piping to the jacket:
Steam Jacketed
Basically, the piping should be so arranged that
steam flows from the top and leaves from the
bottom. Provide steam traps at outlet ports (see
figure below).
Hot-water Jacketed
Basically, the piping should be so arranged that
hot water flows from the bottom and leaves from
the top (see figure below).
(3) Although the measuring chamber is heat
treated, due consideration should be taken
not to give piping elongation or contraction by
sharp temperature changes or pipe strains.
Progressive heating is suggested at least four
hours before commencing service operation.
(4) As for outline dimensions and tubing connec-
tion dimensions, see approval drawings.
(5) If heat tracing is desired, considerations
should be taken to facilitate maintenance and
servicing.
Make sure, if it is the case, that there is no
liquid leaks when related components are
covered with lagging material.
(6) Lagging should be so provided that the top
cover of strainer is easily accessible. Also it is
necessary that the strainer net be cleaned on
a regular basis.
(7) Never attempt to lag radiator fins. Lagging
them will cause excessive heat buildup in the
register and pulse generator, possibly leading
to costly downtime.
NOTE: As for outline dimensions and tube connection dimensions, see approval drawing.
Flow
Direction
Hot Water IN
OUT
Hot Water Jacketed Type, Horizontal Run
Flow
Direction
Steam IN
OUT
Steam Jacketed Type, Horizontal Run

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10. DISASSEMBLY AND INSPECTION
◎Although it depends on individual operating conditions, periodic disassembly and
inspection should be performed at least once a year.
CAUTION: Because Ultra Oval is a precision industrial instrument, disassembly
and inspection should be performed indoors as a rule. If it is desired to
disassemble and inspect it as installed in the field, an important precaution
to remember is to reduce the internal pressure of the piping assembly to a
safe level, shut off valves upstream and downstream of the meter fully, drain
the piping assembly and then place a suitable fluid receptacle directly below
the Ultra Oval. Exercise care to keep individual members disassembled free
from grit and dust.
CAUTION: If the meter is of externally powered type, be sure to turn off power to the
register before you disassemble.
◆Meter Body Inspection ◆Complaint and possible cause: Process fluid will not run.
Jammed with scales, the Oval rotors fail to rotate, resulting
in an interrupted fluid flow.
10.1 Size 50 Meter Body Disassembly and Inspection
①Take off all six hex bolts (104) (M6), using a
wrench (10mm).
With hex bolts removed, the register assembly
is ready to be separated from the meter body.
Be careful not to drop the register assembly.
②With the front cover (register end) removed,
the measuring chamber with Oval rotors and
other components are now accessible.
Hex Socket
Head Bolt
Meter Body
Front Cover
(register end)
Hex Socket
Head Bolts
O-Ring

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③Remove the Oval rotors (201) from the measur-
ing chamber and inspect them for condition.
(a) Inspect the Oval rotors to see if they are
jammed with foreign solids.
(b) Check the rotors, shafts and other members
for wear.
(c) Inspect the measuring chamber and the inner
wall of front cover for damage or any other
sign of unusual condition.
Upon completion of these inspections, clean
the Oval rotors, rotor shafts, measuring
chamber and front cover with clean water or
suitable solvent thoroughly.
CAUTION
Score marks, scratches, high spots due to impressions, or other flaws should be
reconditioned flat with oil stone or other tool.
10. 2 Size 50 Meter Body Assembly Procedure
PRECAUTIONS BEFORE ASSEMBLY
Oval rotors, inner walls of the rotor shafts, inner wall of the measuring chamber, inlet
and outlet ports, and inner surface of the rear cover should be thoroughly washed clean,
completely removing dust, grime and other foreign matter.
①Rotor Installation
Rotor installation is correct if the sides where
signal generating magnets are embedded face the
transmitter (bottom of the measuring chamber) and
the sides with match marks (・)(・・) face the rear
cover.
Carefully install the rotors with the 1st rotor (match
mark "・") on the shaft with "1" stamped on the
outside of measuring chamber and the 2nd rotor
(match mark "・・") on the shaft with "2" stamped.
Ensure that the match marks are in alignment as
shown in the photo.
②Confirming the Rotor Gear Engagement
Hand rotate the rotors to make sure of correct
gear mesh.
Rotor
Shafts
Measuring
Chamber
Rotors
Flow Direction Arrow and
2nd Rotor No.
2nd Rotor
IN
OUT
1 st Rotor
Signal Magnets Flow Direction
Arrow and 1st Rotor No.
IN
OUT
Direction of Rotor Rotation
Match Marks
2
1