Oval EL4061 User manual


STEAM FLOW COMPUTER
MODEL : EL406
Ins. No. E-822-9-E
Every OVAL product is fabricated and shipped from our factory under stringent quality control. In order
to maintain its design performance throughout its life, this manual offers the operator the necessary
installation, operation and maintenance information.
Be well familiar with these instructions before you place the computer in service and keep this manual at
the eld location for ready reference.
We also recommended you to read the instruction manuals for the companion pulse generator (flowmeter)
and receiving instrument.

E-822-9-E

1. GENERAL .............................................................................................................................. 3
〈FEATURES〉........................................................................................................................ 3
2. PART NAMES......................................................................................................................... 3
3. OUTLINE DIMENSIONS ........................................................................................................ 3
4. INSTALLATION ...................................................................................................................... 4
4.1 Installation Location.........................................................................................................4
4.2 Mounting Panel................................................................................................................ 4
4.3 Installation Procedure......................................................................................................4
5. WIRING .................................................................................................................................. 5
5.1 Cables for Field Wiring ....................................................................................................5
5.2 Wiring Connections..........................................................................................................5
5.3 Terminal Block for External Connections ......................................................................... 5
6. OVERALL BLOCK DIAGRAM ................................................................................................ 6
7. CONVERSION FORMULA..................................................................................................... 6
8. CHANGING THE PULSE GENERATOR TYPE, METER SIZE (nominal bore),
METER ERROR, AND SCALER SETTINGS ......................................................................... 7
9. PULSE/ANALOG CONVERTER BOARD (OPTION) ............................................................. 8
10. OPERATION......................................................................................................................... 8
10.1 Preparation Before Operation........................................................................................ 8
10.2 Operation ....................................................................................................................... 8
11. TROUBLESHOOTING.......................................................................................................... 8
12. OPERATION FLOW CHART................................................................................................ 9
13. PRODUCT CODE EXPLANATION .................................................................................... 11
14. TOTAL COUNTER AND OUTPUT UNITS.......................................................................... 11
15. GENERAL SPECIFICATIONS............................................................................................ 12
CONTENTS
This manual uses the precaution words
"NOTE", "CAUTION", and "WARNING" as explained below:
NOTE:
Notes are separated from the general text to bring the user's
attention to important information.
CAUTION:
Caution statements inform the user of hazards or unsafe practices
which could result in minor personal injury or product/property
damage.
WARNING:
Warning statements inform the user of hazards or unsafe practices
which could result in severe personal injury or death.

E-822-9-E

1. GENERAL
Dedicated for steam service, this computer accepts signals from a steam service delta flowmeter. It
contains a microprocessor to perform steam pressure setting relative to service pressure, size (nominal
bore) setting and meter error adjustment, and indicates the total flow in terms of weight for accurate,
precise flow measurement.
〈FEATURES〉
（1）An inexpensive steam service computing totalizer for use with a steam service delta flowmeter.
（2）Simple pressure setting relative to the service pressure.
（3）Readily accepts size (nominal bore) alterations.
（4）A variety of self diagnostic features.
（5）Compatible with an instantaneous flow indicator (option).
2．PART NAMES
3．OUTLINE DIMENSIONS
OPERATIONINDICATOR
LED(RED)
7-DIGITTOTAL
COUNTER
UNITSOF
MEASURE
NAMEPLATE
PRESSURE
SETTING
SWITCH
UNITSOF
MEASURE,MPa
SEFT-TEST
BUTTON
TAGNO.NAMEPLATE
ENCLOSURE
MTG.FITTING
MODEL
NAMEPLATE
TERMINALSTRIP
(10P)
TERMINAL
IDENTIFICATION
POWERFUSE(0.5A)
PANEL1.6THICKMIN.
ENCLOSUREMTG.FITTING
(ONEEACHONTOPANDBOTTOM)
TERMINALSTRIP
75
150
10
180±1
201±1
11
Unit：mm
135
0 −1
67
0
−1
NOTE:1AFOR24VDCMODEL
Fig. 2.1
OPERATIONINDICATOR
LED(RED)
7-DIGITTOTAL
COUNTER
UNITSOF
MEASURE
NAMEPLATE
PRESSURE
SETTING
SWITCH
UNITSOF
MEASURE,MPa
SEFT-TEST
BUTTON
TAGNO.NAMEPLATE
ENCLOSURE
MTG.FITTING
MODEL
NAMEPLATE
TERMINALSTRIP
(10P)
TERMINAL
IDENTIFICATION
POWERFUSE(0.5A)
PANEL1.6THICKMIN.
ENCLOSUREMTG.FITTING
(ONEEACHONTOPANDBOTTOM)
TERMINALSTRIP
75
150
10
180±1
201±1
11
Unit：mm
135
0 −1
67
0
−1
NOTE:1AFOR24VDCMODEL
Fig. 3.1

E-822-9-E
4
4．INSTALLATION
4.1 Installation Location
Select an installation location where
（1）Mechanical vibration, shock and corrosive
gases least exist.
（2）Air is dry and temperature at room
temperature and stable.
NOTE: Although the manufacturer guar-
a n t e e s s t a t e d p e r f o r m a n c e a t
ambient temperatures up to 50 ℃, it
is recommended that the instrument
be placed in service at room temper-
ature.
（3）Provide a sufficient working space behind
the instrument - at least 50 centimeters from
the back of the instrument - to facilitate wiring
and maintenance.
4.2 Mounting Panel
（1）Use a rigid steel sheet with a minimum
thickness of 1.6 millimeters. Suggested
thickness is approximately 3.2 mm.
（2）If it is desired to mount instruments side by
side, dimensions in Fig.4.1 are suggested.
（3）Recommended mounting height ranges are
given in Fig.4.2.
4.3 Installation Procedure
（1）Front mount the steam flow computer through
the opening cut in the panel.
（2）Pass the enclosure mounting ttings furnished
through the holes at the bottom of the
enclosure and, con-rming that the instrument
is positioned on a level plane, secure the
instrument to the panel with the mounting
ttings (see Fig. 2).
Fig. 4.1 Panel Cutout
Fig. 4.2 Mounting Height
95min.
68−0.7
0
138 ＋1
0
200 min.
OPTIMUM RANGE
ALLOWABLERANGE
600
1800
450
2200
95min.
68−0.7
0
138 ＋1
0
200 min.
OPTIMUM RANGE
ALLOWABLERANGE
600
1800
450
2200
Unit：mm
Unit：mm

E-822-9-E

TERMINAL
STRIP
5. WIRING
5.1 Cables for Field Wiring
（1）Use electrostatically-shielded, polyethylene-insulated, vinyl-sheathed control cables, or equivalent,
for input signal cables (CEVS 1.25-2.00mm2, 2-conductor). For signal cables, vinyl-insulated, vinyl-
sheathed cables (CVV, CVS, JIS C 3401) are recommended.
（2）Ground the cable shielding to terminal "G" of the instrument. All circuitry on the detector side must
be "floated" from ground.
CAUTION
Make electrical connections upon
confirmation of valid combinations
of flowmeter (pulse generator) and
receiving instrument by their model
No., serial No., etc.
Fig. 5.1 Terminal Strip
（2）Separate field wiring from other power lines and power circuits to minimize the possibility of
inductive interference.
（3）Using crimp-style terminals for wiring connections, ensure good electrical connections. Terminals
are found on the back of the computer.
（4）Good practice is to provide an allowance of 30 centimeters approx. to the wirings to facilitate
internal assembly withdrawal during servicing.
5.2 Wiring Connections
（1）Conduit work is recommended for eld wiring.
NOTE: In conduit work, use separate conduit for power cable and signal cables to eliminate the
possibility of stray current pickup.
NAME TERMINAL No. DESCRIPTION
Power 9 (hot)
10 (neut) 100V, 110V/115V, 200V, 220V/230V AC, 50/60Hz
Ground 8 Earth ground terminal
Flow Input PA15, 25 1, 2 1：＋ 24V，2：SIG
Weight Output 4, 5 4 ( ＋), Width 5 ( －), Open collector output
Width:1 to 4ms(reduction 1/1), 40 to 60ms(reduction 1/10 or 1/100)
Weight Analog Output * 6, 7 6 ( ＋), 7( －) 0 to 100 μA, 0 to 10mA
4 to 20mA, 10 to 50mA, 1 to 5V DC
5.3 Terminal Block for External Connections
NOTE *: Analog output is option.

E-822-9-E
6
POWERSOURCE
POWERTOPULSE
GENERATOR
FLOWRATE
PULSEINPUT
WEIGHT
ANALOGOUTPUT
WEIGHT
PULSEOUTPUT
0.5Aor1A
24V
5V
POWER
SUPPLY
CURRENTLIMIT
ANDOVERCURRENT
DETECTORCIRCUIT
WAVESHAPING
F/ICONVERTER
CIRCUIT
(OPTION)
ONE-SHOTMULT.
OUTPUTCKT.
CHECK/RUN
CONTROLCKT.
FREQ.DIVISION
SELECTOR
1/1,1/10,1/100
INSTANTANEOUSPOWER
INTERRUPTIONDETECTOR
ANDPOWERRESETCKT.
METERERROR,FREQ.
DIVISION.APPLICABLE
STANDARDSETING
JUMPERS
INTERRUPTCKT.
SETTINGRANGE
0.00to1.99MPa
PRESSURE
SETTING
SWITCH
7-DIGIT
TOTAL
COUNTER
LED
TEST
CHECK/RUN
SELECT
SWITCH
(FRONTPANEL)
SIZE(NOM.DIA.)
SETTING
SWITCH
ONE-SHOTMULT. CIRCUIT
SINGLE-CHIPMICROPROCESSOR
6．OVERALL BLOCK DIAGRAM
Fig. 6.1
7．CONVERSION FORMULA
In response to the incoming flowrate signal from a delta meter, the computer performs weight conversion
of saturated steam according to the setpoints established on the front panel preset switches.
（Input pulse factor）×（Specic weight）×ε t
〈Conversion Formula〉＝
（Output unit）
εt＝１＋３α（t－20）
where t : Temperature
３α：4.8×10－5（stainless steel）
The specic weight is thus determined in approximation as a function of the second degree.

E-822-9-E

8．CHANGING THE PULSE GENERATOR TYPE, SIZE (nominal bore),
METER FRROR, AND SCALER SETTINGS
(They are correctly set in the factory before shipment and normally require no further alterations.)
（1）Input Settings Relative to Pulse Generator Type
（2）Selection of Size (nominal bore)
With S4 (hexadecimal rotary switch). set up the value which agrees with the meter size, referring to
the table below.
Flowmeter Pulse Generator Type
R1 R4
R21 J
8
（jumper）
Preamplier PA15 or 25 Eliminated 240 Ω、1W 39 Ω、1/4W Shorted
（3）Selection of Meter Error
A compensation range of ±7.5% is covered with jumper J1in increments of 0.5%.
Rotary Switch Nominal Size,
mm
Nominal Meter
Factor Rotary Switch Nominal Size, mm
Nominal Meter
Factor
0 15 0.005338 8 50 ②0.1001
1— — 9— —
2 25 ①0.01613 A 80 0.3328
3 25 ②0.01650 B 100 0.7567
4— — C 150 2.422
5 40 ①0.04363 D 200 7.021
6 40 ②0.04556 E 250 13.54
7 50 ①0.09655 F 300 23.24
NOTE: Separate rotary switch positions are allocated because positions 2 and 3; 5 and 6; 7 and 8
have different nominal meter factors.
（4）Selection of Scaler Setting (for total counter)
J2(jumper): Open →1/100; shorted →1/10
NOTE: In totalizer scaler setting, a 1/10 scale may, under certain conditions, not be available
depending on given operating conditions.
For details, see Section "13. Total Counter and Output Units".
（5）Power Source Selection
（6）Selection of Scaler Setting (for pulse output)
（7）Miscellaneous
In the standard specication, J9through J12 are shorted out across "1-C".
Power Source
J3J4J5
J
6
J
7
100V AC, 50/60Hz C-2 Open Open Shorted Shorted
110/115V AC, 50/60Hz C-1 Open Shorted Open Shorted
200V AC, 50/60Hz C-2 C-1 Open Open Open
220/230V AC, 50/60Hz C-1 C-2 Open Open Open
Frequency Division J
13
J
14
Output Width
1/1 C-10 C-1 1 to 4 ms
1/10 C-10 C-2 40 to 60 ms
1/100 C-100 C-2 40 to 60 ms

E-822-9-E

9．PULSE/ANALOG CONVERTER BOARD (OPTION)
An F/I converter board to provide an analog output proportional to the pulse frequency after weight
conversion may be added as an option.
（1）0 to 100 μA or 0 to 10mV output
★ Output adjustment is made with VRI.
（2）In cases of 4 to 20mA, 10 to 50mA or 1 to 5V output
10．OPERATION
10.1 Preparation Before Operation
（1）Inspect that your instrument and related equipment are correctly installed and wired with no points
left unnished (including size, meter error and frequency division settings).
WARNING: Make sure to see that the power terminals are connected to a
power source of the rated voltage. Applying a power source of
incorrect voltage could ruin your instrument.
（2）Preoperational Checks
Check to see whether or not the computer registers counts with no flow.
（3）How to Check
① Turn on power and make sure that the front panel LED lights at intervals of two or three seconds.
② Depress the CHECK button and confirm individual settings in the CHECK mode.
(CHECK mode operation is described on Sec.12.)
10.2 Operation
（1）Turning on power
The LED will light up about a second later and stays on for about two seconds before the RUN mode is indicated.
（2）Allow steam to flow to initiate service operation.
11．TROUBLESHOOTING
Output J9J10
4 to 20 mA 2 －C 2 －C
10 to 50 mA 2 －C 2 －C
1 to 5 V 1 －C 1 －C
SYMPTOM CHECK POSSIBLE CAUSES
1. The LED fails to come on.
1. Inspect fuse.
2. Make sure of power source
voltage.
1. Fuse is blown.
2. Line voltage is improper.
3. A fault in internal power supply.
2. The LED shows RUN mode but
fails to count incoming pulses.
1. Input signal lines.
2. Signal coming in?
1. Incorrect input wiring.
2. Flowmeter preamlier is at fault.
3. A fault in the input circuitry.
3. The LED indicates a fault in the
probe. 1. Input signal lines. 1. Incorrect input wiring. 2. Flowmeter preamplier is at fault.
4. Erratic accumulated total
reading.
1. Size (nominal dia.) and pressure
settings (see "CHECK Mode"). 1. A fault in the internal assembly.
If the trouble is suspected to be internal to the steam ow computer, seek our service.
NOTE: J9 and J10 are jumpers on the computing board.
Fine output adjustment is made with VR2 (zero adjust) and VRI (span adjust).

E-822-9-E

RUNMODEFLOWCHART
RUNMODE
Sizesetting
correct?
YES
Pressure
changed?
NO
NO
LEDlightsat
intervalsof
2sec.
Sensor
faulty.
YES
YES
LEDlightsat
intervals.of
2sec.
LEDblinksat
intervalsof
onesec.
LEDlights0.5
sec.:goesout
0.5sec.
itrepeatsthis
cycling.
※
Inputpulses
areunacceptable
atthistime.
LEDblinksfast
for2sec.
LEDblinks
forpresetnumber.
LEDlights
for0.5sec.
LEDblinks
forpresetnumber.
LEDlights
for0.5sec.
LEDblinks
forpresetnumber.
LEDlights
for0.5sec.
Press.setting
onel.h.digit
(0,1).
Press.setting
onecenter
digit(0to9).
Press.setting
ldigitatR.H.
end(0to9).
CHECKMODEFLOWCHART
CHECKMODE
LEDblinks
for2sec.
Totalcounter
counts3pulses;
LEDlightsin
synchronism.
LEDblinks
for2sec.
LEDlightsforpre-
setnumberatin-
tervalsof0.5sec.
LEDlights
for0.5sec.
LEDlightsforpre-
setnumberatin-
tervalsof0.5sec.
LEDlights
for0.5sec.
LEDlightsforpre-
setnumberatin-
tervalsof0.5sec.
LEDlightsfor
0.5sec.
LEDblinks
foronesec.
Sizesetting
correct?
Showsthe
checkmode.
Checksinput
andoutput
circuitswitha
simulatedpulse
train(1hZ).
Showspressure
settingbeing
reviewed.
Press.setting
onel.h.digit
(0,1).
Divisionby
decimalpoint
Press.setting
onecenter
digit(0to9).
Press.setting
1digitatR.H.
end(0to9).
Showssize
beingreviewed.
LEDblinksonand
offatintervals
of0.5sec.
Size(nom.dia.)set
correctlyornot
NO
NO
YES
12．OPERATION FLOW CHART

E-822-9-E
0
LEDlightsforthe
presetnumberat
intervalsof0.5sec.
LEDlights
for0.5sec.
Metererror
set?
LEDblinkstwice
forasecond.
Positive
correction?
LEDlightstwice.
LEDlights
for0.5sec.
LEDlightsforthe
presetnumberat
intervalsof0.5sec.
LEDlights
for0.5sec.
LEDlightsforthe
presetnumberat
intervalsof0.5sec.
LEDlights
for0.5sec.
MeterSizeisshownininches:
Indicatestherotaryswitchpositioncurrentlysetup.
PostitionsA,B,C,D,E,andFareindicatedbyblinking
10,11,12,13,14,and15times,respectively.
NO
NO
YES
YES
Metererror
setornot
Showswhetherpositive
correctionornegative
correction.
LEDlightsonce.
Showsthefirstdigitof
thefigureinpercent(0to3).
Showsthelastdigitof
thefigureinpercent(0to5).
Freq.division
set?
LEDlightsfor2sec.
RUNMODE
1/10Freq.division
setornot
NO(1/100)
YES(1/10)
①Incomingpulsesareunaccept-
ablewhilemakingacheck.
②Blinkpatternisshownbelow.
EXAMPLE:Intervalsatonesecond
NOTE:
1sec. 1sec. 1sec.
LIGHTS LIGHTS
GOES
OUT