Omega FMG490 Series User manual

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User’s Guide
TM
FMG490 SERIES
Municipal/Industrial Magmeter

FMG490 INSTRUCTIONS
Page 2
The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains
, and reserves
the right to alter specifications without notice.
omega.com [email protected]
Servicing North America:
U.S.A.
Omega Engineering, Inc.
800 Connecticut Ave, Suite 5N01, Norwalk, CT 06854
Headquarters:
Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: [phone] Fax: [phone]
e-mail: [email protected]
For Other Locations Visit omega.com/worldwide

FMG490 INSTRUCTIONS
Page 3
TABLE OF CONTENTS
General Information
General Information ...................................................................................................................................................Page 4
Features...........................................................................................................................................................................Page 4
Specications ................................................................................................................................................................Page 5
Dimensions ....................................................................................................................................................................Page 6
Accuracy..........................................................................................................................................................................Page 7
Flow Rate ........................................................................................................................................................................Page 7
Installation
Straight Pipe Recommendations...........................................................................................................................Page 8
Full Pipe Recommendations....................................................................................................................................Page 9
Positioning the Meter ..................................................................................................................................................Page 10
Installing Gaskets...........................................................................................................................................................Page 10
Tightening Flange Bolts ..............................................................................................................................................Page 11
Equalization and Grounding (Metal and Plastic Pipe).....................................................................................Page 11
Connections
General Cable Information.......................................................................................................................................Page 12
Cable Gland Opening and Sealing........................................................................................................................Page 12
Cable Installation .........................................................................................................................................................Page 13
Wiring Diagrams ..........................................................................................................................................................Page 14
Cable Wiring Table ......................................................................................................................................................Page 15
Conguration
Sourcing Mode Output Application.....................................................................................................................Page 16
Sinking Mode Output Application........................................................................................................................Page 16
Analog (4-20mA Current Loop) Output Application .....................................................................................Page 16
Cable Shield...................................................................................................................................................................Page 17
Pulse Output..................................................................................................................................................................Page 17
Analog (4-20mA) Output..........................................................................................................................................Page 17
Operation
Changing Flow Meter Settings - Home Screen and General Navigation..............................................Page 18
Changing Flow Meter Settings - Changing Total Direction/Resetting Totalizer .................................Page 18
Changing Flow Meter Settings - Entering Menu System.............................................................................Page 18
Changing Flow Meter Settings - Making Selections......................................................................................Page 18
Changing Flow Meter Settings - Standard Menu Options..........................................................................Page 19
Changing Flow Meter Settings - Special Submenu........................................................................................Page 19
To Change a Passcode...............................................................................................................................................Page 20
Power Indicators ..........................................................................................................................................................Page 21
Troubleshooting & Error Messages
Problem...........................................................................................................................................................................Page 22
Probable Cause.............................................................................................................................................................Page 22
Things to Try..................................................................................................................................................................Page 22
Error Messages .............................................................................................................................................................Page 22

FMG490 INSTRUCTIONS
Page 4
GENERAL INFORMATION
The FMG490 Series is a spool-type electromagnetic
owmeter for use in irrigation applications in 3” to 12” pipe.
With no moving parts, these meters provide unobstructed
ow and are resistant to wear from debris found in ground
or surface water. Little maintenance is required because
there are no bearings to wear out or propellers to stop
turning. Minimal straight pipe requirements allow FMG490
meters to be used in piping congurations where there is
little space between the meter and an elbow.
The display for the FMG490 is mounted remotely for ease of
access. The FMG490 is available as either AC or DC powered,
with battery backup. Both rate and total indication show
on the remote mounted display. Bidirectional ow reading
is standard with totals available in forward, reverse, net
ow, batch forward ow, and batch reverse ow. Batch
totals can be reset. Built-in data logging is available as an
option for secure ow logging.
Scaled pulse output is standard and one additional output
can also be added, such as 4-20mA.
The FMG490 Series is CE certied and IP68 for burial, or
applications where the meter may be under water for
prolonged periods of time. All meters are provided with
a security seal to protect against unauthorized access.
The seal can be broken by an authorized agent to replace
the battery pack or eld install a power/output cable. The
cable(s) are eld installed.
Features
No moving parts!
Welded steel epoxy-coated ow tube
Flanges, 150 lb.
ANSI pattern
Santoprene/
Polypropylene Liner
Equalization lug
Powder-coated diecast aluminum housing
Rate and total indicator with
light sensor button controls
316SS electrodes (Inside)
Power and Output
cable port access
User access lid (on back)
Data logger port
Remote cable access
Remote cable access
Mounting ange
Snap on faceplate
cover and lanyard

FMG490 INSTRUCTIONS
Page 5
GENERIAL INFORMATION
Specications*
* Specicationssubjecttochange.
2 RateTimeUnitisavailableinDayonly.
Pipe Sizes 3”, 4”, 6”, 8”, 10”, 12”
Flanges 150 lb. ANSI Pattern
Pressure 150 psi (10.3 bar) line pressure
Temperature Operating 10˚ to 140˚ F (-12˚ to 60˚ C)
Storage -40˚ to 158˚ F (-40˚ to 70˚ C)
Accuracy ±0.75% of reading on FMG480 and FMG490 (±1.0% FMG470), ±0.025% of full-scale ow from low ow
cuto to maximum ow rate of 10 m/sec
Low Flow Cuto 0.5% of maximum ow rate
Material Body (3”only) Ductile cast iron, powder coated
Body (4”-12”) Welded steel, epoxy-coated
Liner (3”only) Noryl®
Liner (4”-12”) Santoprene ange/Polypropylene liner body
Electronics Housing Powder-coated diecast aluminum
Electrodes 316 stainless steel
O-ring (3” only) EPDM
Display Type 128x64 dot-matrix LCD
Digits 5 Digit Rate 8 Digit Total
Units
PleaseNote:
AllFMG470metersare
factorysetforgallonsper
minute(GPM)rateandacre
feettotal.Ifotherunitsare
required,theycanbesetin
theeld.
Rate Volume Units Rate Time Units Total Volume Units
Gallons
Liters
Barrels(42 gal)
Cubic Feet
Cubic Meters
Million Gallons2
Mega Liters2
Imperial Gallons
Million Imperial
Gallons2
Second
Minute
Hour
Day
Gallons
Gallons x 10
Gallons x 100
Gallons x 1000
Million Gallons
Liters
Kilo Liters
Mega Liters
Barrels (42 gal)
Cubic Meters
Cubic Meters
x 1000
Cubic Feet
Cubic Feet x 1000
Second Foot Day
Million Cubic Feet
Acre Feet
Acre Inches
Imperial Gallons
Imperial Gallons
x 1000
Million Imperial
Gallons
Fluid Ounces
Bidirectional Forward Total, Reverse Total, Net Total, Batch Forward Total, Batch Reverse Total (Batch totals can be reset)
Power DC Power 9-36 Vdc @ 250 mA max, 30 mA average
Battery Backup
(Not for use as primary power)
DC powered units: Two lithium 3.6V ‘D’ batteries, replaceable.
AC powered units: One 9V alkaline battery, replaceable.
AC Power (FMG490and
FMG480only)
85-264Vac, 50/60Hz, 0.12A
Battery (FMG470only) One lithium 7.2V ‘D’ size battery pack, replaceable.
Scaled Pulse
Output
Signal Current sinking pulse, isolated, 36 Vdc at 10 mA max
Pulse Rates User-scalable from 0.1 to 99,999.9 volume units/pulse. Pulse width is one-half of pulse period with
minimum pulse width of 2.5 ms, 200 pulses/sec max. For battery option meters, pulse width varies with
frequency, 150 pulses/sec max.
Options 4-20mA Current Loop Isolated, passive, 24Vdc, 650 Ω maximum current loop
Cable Power/Output Cable 20ft (6m) standard length polyurethane jacketed cable—for power and outputs (lengths up to 200’
available).
Remote Display Cable
(FMG490)
20ft (6m) standard length polyurethane jacketed cable—for connection between meter and remote
display (lengths up to 200’ available).
Conductivity >20 microSiemens/cm
Empty Pipe Detection Hardware/software, conductivity-based
Regulatory (EN 61326)
Environmental NEMA 6P, IP68 (10ft (3m) depth, continuously)

FMG490 INSTRUCTIONS
Page 6
Dimensions
Remote Display
GENERAL INFORMATION
Remote Meter
3.500” (88.9mm)
4.000” (101.6mm)
6.840” (173.7mm)
4.375”
(111.1mm)
5.200”
(132.1mm)
Ø 0.200”
(5.08mm)
Ø 5.285”
(134.2mm)
4.150” (105.4mm)
H
L
T
ID
Install security seals during
installation if regulations require.
FMG490
Meter
Size
L H T ID Shipping
Weight
inch mm inch mm inch mm inch mm lbs Kg
3”* 12.25 311 7.08 179.8 .68 17.25 2.6 66.04 40 18
4” 10.12 257 8.3 211 .62 15.7 3.12 79 43 19.5
6” 12.09 307 9.1 231 .69 17.5 5.05 128 59 27
8” 14.14 359 10.1 257 .69 17.5 6.44 164 78 35
10” 18.08 459 11.2 284 .69 17.5 8.61 219 135 61
12” 19.68 500 12.2 310 .81 20.6 10.55 268 175 79
Flanges Standard ANSI 150 lb. drilling Cable 1 lb.
*Add8lbs(3.5kg)forremotedisplay.3”Only.
Note: ‘L’ dimension is total from liner face to liner face

FMG490 INSTRUCTIONS
Page 7
Flow Rate (3” - 12”)
GENERAL INFORMATION
0
1
2
3
4
5
330 5 10 15 20 25 30
Accuracy (%)
Flow Velocity
(m/s)
(ft/s)
0
1
2
3
4
5
510 15 20 25 30 33
0
420 6 8 10
FMG490 Accuracy
Pipe Size
(Inchesindiameter) 3” 4” 6” 8” 10” 12”
Max Flow Rate
(Gallons/Minute) 723 1285 2891 5140 8031 11565
Cut-o (min) Flow
Rate
(Gallons/Minute)
3.62 6.43 14.46 25.70 40.15 57.82
Max Flow Rate
(Liters/Second) 46 81 182 324 507 730
Cut-o (min) Flow
Rate
(Liters/Second)
0.23 0.41 0.91 1.62 2.54 3.65
Max Flow Velocity
(Meters/Second) 10 10 10 10 10 10

FMG490 INSTRUCTIONS
Page 8
INSTALLATION
Straight Pipe Recommendations (X=diameter)
12345
1X
2X
2X
2X
1X
5X
5X
5X
Reduced Pipe
Two Elbows In Plane
Two Elbows, Out Of Plane
Expanded Pipe
Swirling Flow:
Propeller Meter
Partially Open
Buttery Valve
1X
1X
1X
1X
Swirling Flow:
NOTE: These congurations are to be used as general guidelines and do not cover every possible installation. A
combination of two or more obstructions will require additional straight pipe. If there is any concern about the
length of pipe required for a specic application, please contact your local dealer.

FMG490 INSTRUCTIONS
Page 9
12345
12345
Not Ideal:
Allows air pockets to form at meter
Recommended:
Keep pipe full at meter for accuracy
12345
12345
INSTALLATION
Full Pipe Recommendations
12345
12345
Not Ideal:
Air bubbles and sediment on the
electrodes can aect accuracy
Recommended:
Improved accuracy results from
unimpeded electrodes
Electrode
moved from
top by rotating
meter
Intermittent air
bubbles
miss electrode
Electrodes free
from sediment
build-up
Not Ideal:
Air can be trapped
Recommended:
Allows air to bleed o
12345
12345
Not Ideal:
Post-valve cavitation can create air pocket
Recommended:
Keeps pipe full at meter for accuracy
12345
12345
12345
12345

FMG490 INSTRUCTIONS
Page 10
Positioning the Meter
These meters can be installed horizontally, vertically (with
upward ow), and in any radial position. Using a check
valve on the upstream side of the meter, and/or an air
vent (vacuum relief valve) in the same, unobstructed run
of pipe as the meter, is required in any installation where
the meter may be exposed to suction when the system
is not in normal operation. Suction can cause damage
to the liner. Liner damage caused by suction, without
the use of a check valve and/or air vent, may void the
warranty.
Straight Pipe Recommendations. The FMG490 requires
straight pipe before and after the meter for best accuracy.
However, the ability of electromagnetic meters to average
the ow across the entire pipe allows for shorter straight
pipe recommendations than most mechanical meters (see
page 8).
Full Pipe Recommendations. To prevent false readings,
this meter is designed to indicate ‘EMPTY PIPE’ if one or
more electrodes is exposed. For highest accuracy, install
the meter so that the pipe will be full when there is
ow. If air bubbles may be present in the pipe or sludge
accumulation is an issue, rotate the meter by one ange
hole to position the control housing at a 45˚ angle (see
diagrams on page 9).
Fittings. The meters have ANSI 150 lb. drilled anges and
will mate with any other ANSI 150 lb. anges. Seetable
onpage11forangebolttighteningtorquespecications.
Calibration. The FMG490 meters are factory-calibrated
and will not require any form of eld calibration.
Chemical Injection. When an FMG490 meter is used in a
chemical injection application, the chemical injection
point must be placed downstream of the magmeter OR
far enough upstream for complete mixing to occur
before the uid reaches the meter. When unmixed
chemical alternates with water passing through the meter,
the rapid changes in conductivity may cause sudden spikes
and drops in the meter’s reading, resulting in inaccurate
measurement. The magmeter will restabilize, however,
with a steady ow of uid of uniform conductivity.
CAUTION: These ow sensors are not
recommended where installation may
expose the ow sensor to boiler pressure
and temperature. Maximum recommended
operating temperature is 130˚ F.
CAUTION: In chemical injection applications,
install chemical injection point downstream
of magmeter, or far enough upstream to
allow complete mixing of uids.
INSTALLATION
Installing Gaskets
1. Be sure all mating surfaces are smooth and free of
debris.
2. Install provided gaskets, or equivalent, on each
end of meter as shown in diagrams below. If using
grounding rings, install one gasket on each side of
the grounding ring.
3. Failure to install gaskets will void warranty.
Installationwithoutgroundingrings
Installationwithgroundingrings
GASKETS
Gaskets are required at all
junctions.
Gaskets
Gaskets
Grounding
Rings