Omega FMG980 User guide

User’s Guide

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FMG980 SERIES

Electromagnetic Flow Sensor

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TABLE OF CONTENTS

SECTION I FLOW METER INSTRUCTIONS

General Information

Features, Specications .......................................................................................................................................Page 1

Installation

Distorted Flows, Fitting Installation, Chemical Injection or Fertigation, Meter Installation,

Positioning the Meter ............................................................................................................................................Page 2

Straight Pipe Recommendations .........................................................................................................................

Full Pipe Recommendations .................................................................................................................................Page 4

Electrical Connections

General Electrical Guidelines, Power, Forward Flow Output, Reverse Flow Output,

Grounding Guidelines, Grounding Diagram.........................................................................................................Page 5

Operation & Maintenance

Zero Adjustment, Minimum Flow, Flow Rate Table, Presence of Flow Indication,

Filtering, Electrode Coating, Calibration (“K-Factor”), K-Factor Chart ...............................................................Page 6

Caution & Troubleshooting

Problems, Probable Causes .................................................................................................................................Page 7

Page 3

SECTION II FLOW COMPUTER INSTRUCTIONS

General Information

Features, Specications .......................................................................................................................................Page 8

FMG980 Installation and Settings

Wall Mounting, K-Factor, Reading in Other Units, Changing Volume Units, Changing Time Units,

Settings, Set K, Set P/Flow Alarm, Set 20 mA, Set Decimal Point, Set Time Unit ............................................

FMG980 Connections and Operation

Counter or PLC, FMG980 Display and Proportional Feed ..................................................................................Page 10

FMG980 & 4-20 mA Output, Dual FMG980 Displays (Example of Bidirectional Connection) ........................Page 11

FMG980 Connection Diagram, FMG980-M and FMG980-W Operation ..........................................................Page 12

Quick Settings

Quick Settings Overview .......................................................................................................................................Page 13

FMG980 Troubleshooting

Problems, Probable Causes .................................................................................................................................Page 14

Page 9

SECTION I: FMG980 SERIES FLOW METER INSTRUCTIONS

GENERAL INFORMATION

FMG980 series insertion electromagnetic flowmeters are
designed for use with conductive liquids in 1” to 12” pipe. A
choice of materials (stainless steel, brass, and PVC) allows
the meter to adapt to a range of temperature, pressure, and
corrosive environments.
The FMG980 series are highly suitable for difcult applications
with changing viscosities and pulsating ows, such as air­driven diaphragm pumps. With no moving parts, these meters
can be used in “dirty” applications where debris would foul a
mechanical meter. Like all magmeters, when used in chemical
injection applications, these meters should be installed
upstream of the chemical line (or far enough downstream to
allow complete mixing of uids before the meter).
Designed for modularity and versatility, the FMG980 series

FEATURES

Cover, or transmitter or indicator module

Powder coated aluminum housing

Cable strain relief

has a current-sinking pulse output that can be combined with
the appropriate transmitter or indicator for the application. For
analog output and display of rate and total, an FMG980 can be
used. Modules can be wall- or meter- mounted. If the FMG980
series meter is used with a programmable controller, the output
signal can be fed direct, with no other conditioning required.
FMG980 series xed depth insertion meters require special
ttings. Factory installation in the tting ensures correct depth
placement in the pipe. An FMG980 series meter can be ordered
in a full power model when a source of electricity is available, or
in a low power model that can run on an external battery with
solar panel.

Reverse ow output and immersibility are optional.

O-ring, EPDM (FKM optional)

Sensor body (Stainless, Brass, PVC)

PVDF electrode cap

SPECIFICATIONS*

Pipe Size

Materials Mechanical

Electrodes

Housing

Electrode Cap

O-Ring

Power Full Power

Low Power

Flow Rate

Temperature Ambient Temp

Fluid Temp : Brass/SS

Fluid Temp: PVC

Pressure Brass/SS

PVC

Minimum Conductivity

Calibration Accuracy

Output

Empty Pipe Detection

Regulatory

*Specications subject to change

Page 1

Hastelloy electrodes

1” to 12”

316 SS/Brass/PVC

Hastelloy

Cast powder-coated aluminum

PVDF

EPDM standard (FKM optional)

12 - 25 Vdc, 250 mA

12 - 25 Vdc, 40 mA average with 250 mA peaks

0.28 - 20 ft/sec (0.08 - 6.09 m/sec)

0˚ to 160˚ F (-17˚ to 72˚ C)

32˚ to 200˚ F (0˚ to 93˚ C)

32˚ to 130˚ F (0˚ to 55˚ C) @ 0 psi

200 psi (13.8 bar)

150 psi (10 bar) @ 75˚ F

20 microSiemens/cm

+/- 1% of full scale

Square wave pulse, opto isolated, 550 Hz @ 20 ft/sec

Software, defaults to zero ow

Mark (Stainless Steel, Brass and Standard Power Only)

INSTALLATION

DISTORTED FLOWS

Faster Flow

Distorted

Flow Prole

Fitting Installation. FMG980 series meters require special
ttings that ensure that the ow sensor is installed to the
correct depth. The tting must be installed in the pipeline
before the meter can be installed. For best results, install
with at least ten diameters of straight pipe upstream of the
meter and ve diameters downstream (or more under specic
adverse circumstances). See diagrams, next page.

Causes Meter
To Read High

10X

5X

Caution: In chemical injection or fertigation

applications, install chemical injection point
downstream of magmeter, or far enough
upstream to allow complete mixing of uids
before the meter.

Meter Installation. After the meter tting is installed in the
pipeline, the meter can be installed in the tting. After noting
the direction of the ow arrow, press the meter into the tting
as far as it will go. Retain the meter in place by inserting the
U-clip. The pin can be installed from either side. It may be
necessary to rotate the probe back and forth slightly to start
the pin into the slots on the probe. Slide the pin in as far as
it will go.

Caution: These ow sensors are not recom­mended for installation downstream of a
boiler feedwater pump where installation

fault may expose the ow sensor to boiler
pressure and temperature. Maximum recommended
temperature is 130°F (Plastic), 200°F (Metal).

If there is not enough straight run to smooth out the turbu­lence caused by valves, ttings, and changes in direction,
some decrease in accuracy may result. This does not mean
that the ow meter’s reading is meaningless, however. In
some applications (control systems, valve operation, chemi­cal addition), a repeatable reading may be more important
than a highly accurate one.

Although FMG980 series PVC meter tees are supplied with
some straight pipe, additional straight pipe should be added
to meet straight pipe recommendations. It is not advisable to
connect a ow-disturbing device (e.g. valve or elbow) directly
to the end of these ttings.

A PVC tting is usually installed by solvent welding. The stain­less steel and brass meter ttings have female pipe threads,
requiring the appropriate male threaded ttings. Saddle or
weld ttings (3” and above) require a hole to be cut in the
pipe. Recommended hole size is 1-3/4”.

Chemical Injection or Fertigation. When any magmeter, by
any manufacturer, is used in a chemical injection application
(including fertigation), 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 or fertilizer 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.

POSITIONING THE METER

Okay position if there is no

air in the pipe

BEST POSITIONS

Caution: Never remove the U-clip retainer

when the pipe is under pressure. Always

remove pressure from the pipe before you

attempt to remove the meter. Removal under

pressure may result in damage or serious injury.

Page 2

INSTALLATION

STRAIGHT PIPE RECOMMENDATIONS

(X = pipe diameter)

Reduced Pipe

Two Elbows In Plane

Two Elbows, Out Of Plane

10X

20X

5X

5X10X

5X

Expanded Pipe

Spiral Flow

Swirling Flow

Propeller Meter

Partially Open

Buttery Valve

20X

5X

30X

50X

Page 3

INSTALLATION

FULL PIPE RECOMMENDATIONS

Possible Problem:

Allows air pockets to form at sensor

Better Installation:

Ensures full pipe

Possible Problem:

Post-valve cavitation can create air pocket

Possible Problem:

Air can be trapped

Better Installation:

Keeps pipe full at sensor

Better Installation:

Allows air to bleed off

Page 4

ELECTRICAL CONNECTIONS

General Electrical Guidelines:

• Whenever possible avoid running control cables in
the same conduit with or bundled with AC power.

• Using shielded cable, be sure to connect shield to
ground at power supply end of the cable.

• Avoid routing ow sensor cables in close proximity to
a variable frequency drive.

• Recommended power and output wiring is shielded
twisted pair 18-22 AWG control cable.

• Recommended voltage is 12-24 Vdc. Note that
unregulated power supplies can vary from nameplate
voltage by a considerable amount, especially with AC
line voltage uctuation. Therefore 24V power supplies
must be regulated.

See the Connections diagrams on the following pages for the
appropriate terminals.

Power: A 12 - 24 Vdc power supply capable of at least 250
mA current output is needed.

Forward Flow Output: This open-collector isolated output
does not supply power. This pulse is generated in the forward
ow direction on the standard unit. (Reverse ow output is
available as an option).

Note: This output is limited to 6 mA at 30 Vdc maximum.

Reverse Flow Output: Reverse ow output is available as

an option. This open-collector isolated output does not supply
power. It functions like a polarity-sensitive switch closure.

Note: This output is limited to 6 mA at 30 Vdc maximum.

Grounding Guidelines:

For best results, use a good quality earth ground, such as
metallic water piping or a driven ground, to ensure a good
connection to earth ground and good noise suppression.

If the ow sensor is installed in metallic piping, for optimum
connection clamp wire to the piping a short distance to one
side of the ow sensor using an electrical grounding clamp.
Connect the wire to the earth ground and to one of the housing
screws.

For Non-Metallic Pipe: Connect one to the housing screws
by wire to a good earth ground, such as metalic water piping
or a rod driven into the ground.

EX meters are usually unaffected by moderate levels of electri­cal noise. In some applications performance may be improved
by taking the following steps:

• Use shielded twisted pair cable (Belden 8723 or
equivalent above ground or Alpha 35482 or
equivalent burial).

• Clamp a ferrite bead (Steward 28A2029-OAO or
equivalent) on meter signal/power wire within 3/4”
of the meter strain relief (tape or tie wrap in place
if necessary). See diagram below.

Page 5

• IMPORTANT - Connect the cable shield ground
wire to ground, ONLY at power supply end of cable.

GROUNDING DIAGRAM

PLACE FERRITE BEAD HERE

Earth
Ground

Metallic Pipe

Grounding Clamp

OPERATION & MAINTENANCE

10031295

EF81T-P200

K:158.42

Zero Adjustment. When the FMG980 series is powered up
and there is no ow, there should be no output pulses (or, if
connected to the FMG980, ow rate should read “0”). If there
are pulses it may be necessary to adjust the ow meter under
no-ow conditions after it has been installed. This should only
be done if the indicated ow is low, near the lower cutoff.

Reverse Output Option

Status

LED

Zero

Adjust

Status

LED

Zero

Adj

345621

Forward

Output

Max. 6mA

30Vdc

+

-+-

Power

12-24Vdc

unauthorized repair

Warranty is void if

is attempted!

NOTICE

Pins

To perform the adjustment, after determining that there is a full

pipe with no ow, short between the two pins marked “Zero
Adjust”. A red LED light will come on for approximately 50
seconds and then go out. The zero adjustment is completed.

Minimum Flow. As with any other ow sensor, there is a rate
below which the FMG980 series sensor cannot read. Check
the ow rate table below for the minimum ow rate detectable
by the sensor for a given pipe size.

FLOW RATE (GPM)

Nominal

Pipe Size

• Min

@ 0.28 ft/sec

• Max

@ 20 ft/sec

1” 1-1/2” 2” 3” 4” 6” 8” 10” 12”

.7 1.5 2.7 6 11 25 44 69 99

49 110 196 440 783 1760 3130 4900 7050

Electrode Coating. Grease or other adhering, non-conductive
materials can stop ow detection if the electrodes become
heavily coated. To clean the electrodes, remove the sensor
from the pipe and gently scrub the electrodes (three silver
bumps) on the reading face of the ow sensor. A mild soap
(dishwashing liquid for example) can be used to aid the
cleaning process.

Calibration (“K-factor”). The K-factor represents the actual
number of pulses per gallon the meter produces during a ow
test. This number can be entered into your electronic control
to make it read properly. The FMG980 series meter is ordered
with a tee tting. The ttings have been factory tested and the
K-factor is indicated on the side of the tting (see diagram).

Find Your K-Factor Here

If the FMG980 series meter is ordered with a saddle or wel-

dolet tting, nd your K-factor in the chart below.

K-FACTORS SADDLES & WELDOLETS

3” 4” 6” 8” 10” 12”

PVC/Steel

Sch. 40

PVC/Steel

Sch. 80

Stainless

Steel (10S)

70.397

78.748

62.385

40.985

45.360

36.626

18.130

20.084

16.510

10.497

11.495

9.642

6.674

7.322

6.173

4.709

5.184

4.373

Presence of Flow Indication. To assist in troubleshooting,
the “Status LED” has two blinking modes in normal operation.
When there is no ow detectable by the meter (below minimum
threshold) the LED blinks every 8.0 seconds. When there is
detectable ow, the same indicator blinks every 3.0 seconds.

Filtering. The software of the FMG980 series sensor lters
out electrical noise and averages sudden variations in the
ow to smooth the output. It takes a matter of seconds for
the ow sensor to get up to full output when it is powered up
or when ow begins.

Stainless

Steel (40S)

Copper Tubing

(Type L)

Copper Tubing

(Type K)

Brass Pipe

Duct. Iron
(Class 52)

70.397

76.371

78.371

70.672

57. 376

40.985

43.552

44.638

41. 517

37.320

18.130

19.513

20.223

17.778

16.915

10.497

11.201

11.622

10.445

9.503

6.674

7.230

7.500

6.674

6.197

4.661

5.016

5.239

4.661

4.325

NOTE: K-factors are in Pulses/gallon. For Pulses/Liter, divide
by 3.785.

Page 6

CAUTION & TROUBLESHOOTING

Caution: The electronics of the FMG980 series meters are not eld-repairable.

Warranty is void if unauthorized repair is attempted

TROUBLESHOOTING

Problem

No pulse output

Output pulses
incorrect

Probable Cause Try...

Pipe not full

Below minimum ow cutoff

Unit not grounded

Excessive electrical noise

No power

Flow reversed

Power reversed

Output connections reversed

Fluid conductivity <20 microSiemens/cm

Missing or incorrect ground wire

Excessive electrical noise

Check plumbing

Check the presence of Flow LED (see pg. 9)

Connect to earth ground

Check for proper electrical wiring

Check for power across power
input terminals

Note ow direction arrow,
reverse direction of meter

Reverse connections

Change output connections

Select another ow meter

Check for proper ground

Check for proper electrical wiring

Jumpy reading

Page 7

Fluid conductivity <20 microSiemens/cm

Empty pipe

Not enough straight pipe

Rapidly changing conductivity (in chemical
injection or fertigation applications)

Select another ow meter

Check for full pipe or install meter in the verti­cal position

Check for ten diameters upstream AND ve
diameters downstream

Install chemical injection line downstream of
magmeter (or far enough upstream to allow
complete mixing of uids before meter)

SECTION II: FMG980-M AND FMG980-W FLOW COMPUTER INSTRUCTIONS

GENERAL INFORMATION

These ow computers are microcontroller-based indicator/
transmitters that display ow rate and total and provide out­put signals. The FMG980 is powered by external DC voltage
and has both pulse and 4-20 mA analog outputs. When the
FMG980 is being used in the 4-20 mA mode, it is a “two-wire”
or “loop-powered” device, meaning that the 4-20 mA output
signal doubles as its power supply.

The addition of a dual-relay output board (-R2) allows for
certain applications requiring contact output isolation (e.g.,
certain metering pumps and water treatment controls). Dual
solid state relays provide exactly the same pulse output as
the standard unit, and each can signal one external device. A
non-resettable total is also available.

FEATURES

Electronics Module
Display

Setup Keys**

Cover Screws

The FMG980 Flow Computer can be ordered with a built-in
115 Vac/12-24 Vdc dual power supply for magmeters (-DPW).

Housings are rugged cast aluminum, potted and gasketed
for maximum environmental protection. A membrane keypad
allows settings to be changed without removing the cover.
(Password protection, a standard feature, can be used to
prevent settings from being changed.)

SPECIFICATIONS*

Power

Display Rate

Total

Output Pulse

Analog

Pulse Output Range

Input

Input Range

K-Factor Range

Flow Alarm Output Range

Temperature

Environmental

Lower Housing

Strain Relief

Wall-Mount Brackets

12-32 Vdc (for 4 mA DC min)
24-32 Vdc (for accuracy of 4-20 mA loop)

6-digit autorange, 1/2" character height

8-digit, 5/16" character height

0.1 second open collector pulse (scaled);
0-75 pulse/sec passthrough (unscaled);
High alarm or low alarm

4-20 mA loop (requires 24-32 Vdc)

0.1 - 9999999.9 units/pulse

Open collector/switch @ 5 Vdc

1.0 - 1,500 pulses/second

.001 - 99999.999

.01 - 999999.99

0˚ C - 70˚ C (32˚ - 158˚ F)

NEMA 4X

Page 8

FMG980-M AND FMG980-W INSTALLATION and SETTINGS

Wall Mounting. To mount the FMG980-W on a wall, hold the

unit in the desired position, mark the holes in the mounting
feet, drill, and mount with screws.

10.5

2341678.9

SET

3.93"

4.52"

3.93"

2.06"

2.78"

CONNECTIONS

See Connections Diagram for FMG980-W, next page.

CAUTION! If output is being used to
control an external device, such as a

metering pump, do not connect the
device until programming is complet-

ed. If malfunction or incorrect pro­gramming of the output could cause personal injury
or property damage, separate safeguards must be
installed to prevent such injury or damage.

K-FACTOR

At a minimum, every FMG980 ow computer must be pro­grammed with the “K-factor” (This is the number of pulses
that the meter produces per gallon of ow.) If you wish to
read in units other than gallons, see below.

The K-factor can be found on the model-serial label. The
line reading K = xxxx gives the desired number.

READING IN OTHER UNITS
Changing Volume Units. The default K-factor units are

pulses per gallon. To read your total in metric or other
units instead, the standard K-factor must be converted to
the desired volume units. For example, to read in pulses
per liter, the K-factor must be multiplied by the applicable
number shown below.

NOTE: Both rate & total will read in whatever units you choose.

To Convert K to: Multiply by:

Liters .26418

Cubic Meters 264.18

Fluid Ounces .0078

Cubic Feet 7.48

SETTINGS

Set K. Begin by pressing the SET key once. The prompt SET

K should appear on the display. The digit to the far right will
be blinking. Use the up arrow key to reach your desired value.
Then press the left arrow key to move to the next digit. Repeat
the process until the entire number is entered. (Note that the
decimal is fixed at three places. If you only have two decimal
places for your K-factor, enter a zero for the third digit.) Press
SET to advance.

Set P/Flow Alarm. At this screen you may select between
pulse output (P) or flow alarm (A) functions. If the pulse
output and flow alarm features are not being used, this step
can be skipped. The P (pulse output) setting does not affect
anything if it is not being used.

Set P is the default that appears on a new display. On a unit
that has been previously set up with flow alarm function, an A
will appear on this screen. To move between P and A screens,
firmly press all three keys for 5-10 seconds, then use the up
arrow to scroll through the three options: P, AL HI (high flow
alarm) and AL LO (low flow alarm).

Set P. From this screen, follow the same process as for Set K
to enter the desired pulse rate. This is the number of gallons
(or whatever units are programmed) between pulses. (Note:
Using the pulse output function disables the high and low
flow alarm functions.)

Set Flow Alarm. From the A screen, use the up arrow key to
choose either AL HI or AL LO and then press the SET key to
set the alarm rate. Use the up arrow and left arrow as above
to reach the desired digits. (Note: Using the flow alarm func­tion disables the pulse output function.)

Set 20 mA. Press the SET key to advance to SET 20, to set
the flow rate, in volume units per time unit, at which 20 mA
is desired. Use the up arrow key to reach your desired value.
Then press the left arrow key to move to the next digit. Repeat
the process until the entire number is entered. The processor
will automatically scale the 4-20 mA loop accordingly, with
4 mA at zero flow.

Set Decimal Point. Press the SET key again for the D prompt.
Pressing the up arrow key switches among no decimal place,
one decimal place and two decimal places.

Set Time Unit. When the SET key is pressed again, a
blinking time unit appears. Press the up arrow key
to select SEC (seconds), MIN (minutes), HR (hours) or
DAY (days) (for example, gal/min, or gal/hr).

To return to normal operation after entering settings, press
SET again. When the unit is connected to an operating flow
sensor, the rate (larger digits) and total (smaller digits) indi­cator numbers should appear in the display.

Changing Time Units: To read your rate in liters per sec­ond (for example), convert the K-factor volume units as
shown above and change the time units to Seconds, us­ing the Set Time Unit instructions at right.

Page 9

FMG980-M AND FMG980-W CONNECTIONS and OPERATION

+
_

+

_

+
_

+

_

S

+
_

+

_

+

+
_

_

+
_

+
_

COUNTER OR PLC

Power

Forward Output

Reverse Output

(Option-15 only)

FMG980

*See Dual FMG980 Diagram for an
example of bidirectional connections.

12 - 24 Vdc

Max. 6 mA, 30 Vdc

Max. 6 mA 30 Vdc

FMG980 DISPLAY AND PROPORTIONAL FEED

24 Vdc Power

COUNTER OR PLC DIGITAL

INPUT

FMG980

Power

Forward Output

Reverse Output

(Option-15)

FMG980 SERIES

*See Dual FMG980 Diagram for an
example of bidirectional connections.

Sensor

Input

Power

4-20mA

Pulse

Scaled

Pulse

Pass-Thru

To

Proportional

Feed

Metering

Pump

Page 10

FMG980 CONNECTIONS and OPERATION

FMG980 DISPLAY AND 4-20 mA OUTPUT

FMG980

Power

Forward Output

Reverse Output

(Option-15 only)

*See Dual FMG980 Diagram for an
example of bidirectional connections.

+
_

+
_

FMG980 SERIES

DUAL FMG980 DISPLAYS
(Example of Bidirectional Connection)

24 Vdc

+

Power

_

24 Vdc

Power

_

4-20 mA Device

(e.g. pump, PLC)

_

Sensor

Input

+
S

Pulse

Scaled

+
_

_

+

+

+
_

+

Power

4-20mA

_

Pulse

Pass-Thru

FMG980

Power 4-20mA

Pulse

Pass-Thru

Pulse

Scaled

*Requires 12-24 Vdc power source.

Sensor

Input

*

Power

*

Forward Output

Reverse Output

(Option-15 only)

FMG980 SERIES

*

Sensor

Input

Power 4-20mA

FMG980

Pulse

Scaled

Pulse

Pass-Thru

Page 11

FMG980 CONNECTIONS and OPERATION

FMG980 CONNECTION DIAGRAM

FMG980 Series

Pulse Responsive

Metering Pump

FMG980-M/FMG 980-W

Red
White

SENSOR

INPUT

PULSE

SCALED

Black

4-20 mA

-

+

+

24-32 Vdc

-

POWER

PULSE

PASSTHRU

Loop Power,

Optional Chart

4-20 mA Output

Recorder or Other
4-20 mA Device

If the 4-20 mA current signal is not required, connect the power terminals to any 12-32 Vdc current source.

FMG980-M and FMG980-W OPERATION

Resettable/Non-Resettable Totalizer. Unless the unit has

been ordered with the non-reset option, a RESET prompt is
visible in the lower right corner above the up arrow key, when
the display is in use. Press the up arrow key at any time to reset
the totalizer to zero.

Operation of 4-20 mA Output. If the 4-20 mA output is in use
and is correctly connected, the signal should vary between 4 mA
and 20 mA in proportion to the ow, with the top ow rate set by
the user. At no time should the signal drop below 4 mA. A reading
between 0 and 4 mA indicates a fault of some type, typically in
the loop power supply or the connections (see Troubleshooting).
In the rare instance that the 4-20 signal uctuates excessively

1234.1

SET

123456.7

RESET

CAUTION: Do
not touch Up

Arrow button
unless you
intend to RE-

SET Total to Zero. TOTAL IS

NOT RECOVERABLE.

Indicates resettable totalizer

(“paints”) it may need to be damped by additional averaging.
Contact Omega for information on how to increase ltering.

Operation of the Pulse Output. If the pulse output is being used,
it should pulse for 0.1 second every time the set number of gal­lons has been totalized. If a pulse-responsive metering pump is
properly connected to this output, it should stroke periodically.
If this does not occur, see Troubleshooting.

This key resets total to zero

when in normal run mode.

To Other

Control

Page 12

QUICK SETTINGS

PRESS DISPLAY

QUICK SETTINGS OVERVIEW

See following page for step-by-step instructions on changing these settings

Pass through all settings and return to original display to save settings.

SET

SET

SET

SET

0.00

MIN 209.8

START UP DISPLAY

00001.000

SET K

0000010.0

SET P

0001000.0

SET 20

RESET

d

209.8

Large digits display instantaneous flow rate (GPM).

Small digits display total flow (since last reset).

K is the number of pulses the flow sensor provides

for every gallon of flow.

P is the number of gallons per pulse desired on the

scalable pulse output. (Example: P=1 is one pulse

per gallon.) Skip without changing if you are not

using the pulse output.

20 is the 20 mA maximum analog output. Set the
flow rate you want to match maximum output.
Example: 250 gpm maximum expected flow, “set
20” to 250. The analog output will scale to 4 mA
at zero flow, 20 mA at 250 gpm*.

d is the decimal point. It toggles back and forth

with the . Set as many decimal places as

needed. For higher flows, no decimal allows

maximum number of whole digits.

Page 13

SET

MIN is the time base, for example, gallons per

MIN

*NOTE: Use the up arrow key to reach your desired digit. Then press the left arrow key to move
to the next digit. Repeat the process until the entire number is entered.

minute. Use the to select sec/min/hour/day.

FMG980 TROUBLESHOOTING

Problem

Display blank No power to the unit Check for minimum 12 Vdc at power
terminals

Short in sensor circuit Disconnect sensor, see if display returns
(zero ow rate)

Display missing segments Damaged display module Contact Omega for return/replacement

Display reading meaningless Unit’s microcontroller crashed Disconnect and reconnect power. If problem
characters repeats, contact Omega for return/replacement

Display reads normally, Wrong K-factor or time base entered Enter correct K-factor from meter

Display reads normally, Wrong pulse output setting Use “Set P” to correct pulse output setting
incorrect pulse output
Polarity reversed on pulse output terminals Reverse leads

Display reads normally, but Wrong 20 mA setting Use “Set 20” to correct target top ow rate
no (or incorrect) 4-20 mA
output
Inadequate loop power supply voltage Check voltage (For 4-20 mA applications,
24-32 Vdc recommended)

Probable Cause Try...

Polarity incorrect in 4-20 mA loop circuit Compare to Connections diagram

Display reads zero when Flow sensor failed Consult Omega
there is ow
Break in ow sensor circuit Check for continuity with multimeter

Display reads ow rate when Long ow sensor wire, running parallel to Reroute wire or change to shielded wire
there is none power wires

Flow sensor malfunction Consult Omega

Flow “jitter” (oscillating slosh) reads as ow Consult Omega for “anti-jitter” setting

Page 14

NOTES

WARRANTY/DISCLAIMER

FOR NON-WARRANTY REPAIRS,

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a
period of 13 months f rom date of purchase. OMEGA’s WARRANTY adds an additional one (1) month
grace period to the normal one (1) year product warranty to cover handling and shipping time. This
ensures that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be re t u r ned to the factory for evaluation. O M E G A’s Customer Serv i c e
D e p a rtm ent will issue an Authorized Return (AR) number immediately upon phone or written re q u e s t .
Upon examination by OMEGA, if the unit is found to be defective, it will be re p a i red or replaced at no
c h a rge. O M E G A ’s WARRANTY does not apply to defects resulting from any action of the purc h a s e r ,
including but not limited to mishandling, improper interfacing, operation outside of desi
i m p roper re p a i r, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of
having been tampered with or shows evidence of having been damaged as a result of excessive corro s i o n ;
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA’s c o n t r ol. Components in which wear is not warranted, include but are not
limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various p roducts. Howev er,
OMEGA neither assumes responsibility for any omissions or e
damages that result from the use of its products in accordance with information provided by
OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the
company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
R E P R E S E N T ATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF
TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY W
AND FITNESS FOR A PA R TICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
L I A B I L I T Y: The remedies of purchaser set forth herein are exclusive, and the total liability of
OMEGA with respect to this ord e r , whether based on contract, warr a n t y, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
compon ent upon which l i abi lity is base d. In no event shall O MEGA be liab le for
co

nsequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or
a c t i v i t y , medical application, used on humans, or misused in any way, OMEGA assumes no re s p o n s i b i l i t y
as set forth in our basic WA R R A N T Y/ D ISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA h a rmless from any liability or damage whatsoever arising out of the use of the
P roduct(s) in such a manner.

rrors nor assumes liability for any

ARRANTY OF MERCHANTA B I L I T Y

gn limits,

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN
(AR

) N U M B E R F R O M OMEGA’S C U S T O M E R SE RVICE D E PA R TM E N T (IN O R DER TO AV O I D
PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return
package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.

WARRANTY RETURNS, please have the

FOR
following information available BEFORE
contacting OMEGA:

1 . P u r chase Order number under which the pro d u c t

was PURCHASED,

2. Model and serial number of the product under

warranty, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords
our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2005 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the
prior written consent of OMEGA ENGINEERING, INC.

for current repair charges. Have the following
information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST
of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems
relative to the product.

consult OMEGA

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