Omega FMG2552 User guide

User’s Guide

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FMG 2550 Series

Insertion Magmeter

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WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

Unpacking and Inspection

The OMEGA FMG2550 Series Insertion
Magmeter package includes the following items:

•FMG2550 Series Sensor

•M-2974 Instruction Manual

•FMG255-T installation tool (optional)

Warranty record

For your protection, record the purchase
information for future reference. The serial number
decal is located on the sensor, and also inside the
wiring access plate.

Model: OMEGA FMG2550 Series
Insertion Magmeter

Purchase date:________________________

Serial number:________________________

Purchased from:_______________________

Purchase order number:________________

The technical information
given in this manual is for
general information only.
It implies no warranty of
any kind.

Important Safety Information!

CAUTION: Do not remove from pressurized lines!
Do not remove safety ring from sensor. Unit may
become a dangerous projectile if safety devices
are disabled.

Do not open wiring access plate in humid
environment. Moisture in terminal area may cause
instrument failure.

In EDIT mode, all the output functions of the
OMEGA FMG2550 Series Insertion Magmeter
are still active, so the control process is uninter­rupted.

The OMEGA FMG2550 Series Insertion
Magmeter weighs 11 lbs. Care must be taken to
properly support the unit with straps and/or
bracing when necessary.

Chapter 1
Introduction

1.1 Description

Chapter 2
Installation and wiring

2.1 Sensor location

2.2 Preparing the pipe

2.3 Sensor installation with tool

2.4 Sensor installation without tool

2.5 Wiring

2.6 Grounding requirements

2.7 Installation tips

Chapter 3
Operation

3.1 Control panel description

3.2 Main menu

3.2.1 Access code

3.3 Calibrate functions

3.3.1 Unit

3.3.2 Interior diameter

3.3.3 Current output

3.4 Performance functions

3.4.1 Sensitivity

3.4.2 Response time

3.4.3 Viscosity

3.4.4 AC noise filter

3.4.5 Calibration "B"

3.5 Display options

3.5.1 Operational outputs

3.5.2 Diagnostic displays

3.6 Frequency output

3.6.1 Product compatibility

3.7 Calibration data

3.8 Custom K-factor calculation

3.9 Spare parts list

Specifications

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Table of Contents

This manual contains descriptions, specifications,
and instructions for the installation and operation of
the OMEGA FMG2550 Series Insertion
Magmeter. Should you require further assistance,
please contact OMEGA.

1.1 Description

The latest in bipolar pulsed DC technology and the
best features of an insertion sensor are packed into
the OMEGA FMG2550 Series Insertion
Magmeter. Simple installation, easy maintenance,
and state-of-the-art microprocessor technology
make the FMG2550 Series the best alternative to
traditional full-line magmeters.

The FMG2550 is based on the Faraday principle,
and provides current frequency output signals
proportional to the flow rate. The system
incorporates automatic temperature compensation,
resulting in outputs that are accurate within ±2% of
actual flow rate.

Chapter 1

Introduction

The bipolar electronic design and the 10000 MΩ
input impedance reduce galvanic formation on the
electrodes and minimize coating problems.

The isolated current output provides an universal
signal to recorders, valves, process control and
data acquisition devices.

The open collector frequency output is compatible
with all powered flow controllers such as the
OMEGA FPM-9010A Flow Controller.

See Section 3.9 for an exploded view of the
FMG2550 Series Magmeter.

Fully Developed
Flow Profile

Faraday’s Principle: Move­ment of a conductive fluid
through a magnetic field
generates a perpendicular
electromotive force propor­tional to its velocity.

1

Chapter 2

Installation
and wiring

Inlet

Flange

10 x id 5 x id

Inlet

Reducer

15 x id 5 x id

Inlet

90° elbow

Outlet

Outlet

Outlet

The linearity and accuracy of the FMG2550
Series depends on precise alignment and insertion
depth of the sensor in the pipe and accurate
measurement of the pipe dimensions. The
installation tool (FMG255-T) is recommended for
best results.

2.1 Sensor location

Select a location for the sensor where the flow
profile is fully developed and not affected by any
disturbances. A minimum of 10 pipe diameters of
straight run upstream and 5 diameters downstream
is recommended. Some situations may require 20
pipe diameters or more upstream to insure a fully
developed turbulent flow profile.

The 2550 is sensitive to air bubbles at the
electrodes. If there is any question that the pipe is
absolutely full, mount the sensor at a 45 to 135°
angle. The magmeter requires a clearance of
approximately 16 in./400 mm for removal.

20 x id 5 x id

Measure and record the
interior diameter of the pipe.
This value will be required to
calibrate the FMG2550
Series.

Interior diameter:

______________________________

2

2.2 Preparing the pipe

1. Cut a 2.125 in. ±1/16 in. (54 mm ±1.6 mm)
opening in the pipe. Carefully debur the hole for
best results.

2. Install a standard 2 in. saddle or weld-on fitting
on the pipe. Welded fittings should be installed
by qualified personnel. The threads must be
perpendicular to the pipe within 1° for proper
performance.

2.3 Sensor Installation with tool

FLOW

PIPE I.D.

2A

Process Pipe

Cutaway Side View

2B

The installation tool (FMG255-T) simplifies
installation and insures proper insertion depth for
maximum accuracy.

1B

1. Set installation tool angle
plate (1A) on pipe next to fitting.
Insert adjusting slide (1B) into
top of angle plate.

1A

Installation Tool

Front View

2. Place height gauge (2A) short end inside pipe
and pull up against inside diameter of pipe. Insert
height gauge long end into slot in adjusting slide.
Tighten wing nut (2B) to hold adjusting slide in
place against angle plate. Remove height gauge
from pipe.

3. Loosen the three bolts
at top of the magmeter
adjustment nut (3A).
Wrap the adjustment nut
threads with three full

3B

wraps of sealing tape and
insert sensor into fitting until
base of the electronics

3A

enclosure is resting on top
of adjusting slide (3B).
Be sure cable ports are
pointing downstream.
Thread adjustment nut

Process Pipe

Cutaway Front View

securely into pipe. Tighten
all three bolts to secure
adjustment nut.

Important Safety
Information!

Do not remove safety
ring or adjustment nut
from sensor.

The FMG2550 Series
Magmeter weighs 11 lbs.
Care must be taken to
properly support the unit with
straps and/or bracing when
necessary.

3

Important Safety
Information!

2.4 Sensor Installation without tool

It is recommended that the installation tool always
be used when installing the FMG2550 Series
Insertion Magmeter. If the installation tool is not
available, follow the instructions below. Pay
careful attention to the insertion depth of the sensor
in the pipe and the alignment of the electrodes
relative to the pipe.

Do not remove safety
ring or adjustment nut
from sensor.

The FMG2550 Series
Magmeter weighs 11 lbs.
Care must be taken to
properly support the unit with
straps and/or bracing when
necessary.

Process Pipe

1. Loosen three bolts at top of 2550 adjustment
nut. Wrap adjustment nut threads with 3 full
wraps of Sealing tape and insert 2550 sensor
into fitting. Be sure cable ports are pointing
downstream. Thread adjustment nut securely
into pipe.

2. Adjust meter height so tip of sensor is 0.20
inches below the inside diameter of pipe.
Calculate the "H" dimension:

H = sensor length - 0.2 in - wall =

8.1025 in. - 0.2 in -wall
H = 7.9025 - wall

(H = 200 mm - wall thickness)

3. Align the magmeter parallel with
the pipe ±1°. Retighten the
three 3/16 inch bolts to secure

"H"

Pipe Side View

the sensor in the pipe.

Direction of Flow

Process Pipe

Align Magmeter
with pipe ±1 °

4

FLOW

Pipe Top View

2.5 Wiring

To access the wiring terminals in the FMG2550
Series Magmeter, loosen six captive outer cover
screws (1), lift off outer cover (2), then loosen two
captive screws (3) and remove access plate (4).
A wiring diagram is located on the inside of the
access plate. Five terminal strips are available.

TS 3 Analog output

4 to 20 mA or 0 to 20 mA output
terminal 1 positive (R+)
terminal 2 negative (R-)
18 to 22 AWG wire recommended.

TS4 Serial communication - future expansion

not available in this model.

TS 2 Frequency output

terminal 1 black 5 to 12 VDC in
terminal 2 red open collector pulse out
terminal 3/4 shield cable shield/gnd
see sec 3.4 for detailed information.
18 to 22 AWG wire recommended.

TS 1 Power input

terminal 1 negative
terminal 2 positive
14 to 20 AWG wire recommended.
Recommended power supply:
OMEGA Part #: U24Y101

TS5 Case

chassis ground terminals; see sec 2.6.

Case

Case

3

4

All wiring is installed through
the watertight ports in the
meter. Wrap threads with

sealing

tape before threading

into sockets.

4-20 TS3

4-20 TS3

TS4

TS4

RS485

RS485

RED

RED

SHLD

SHLD
SHLD

SHLD

SHLD

SHLD

24V

24V

TS5

TS5

4

4

3

3

2

2

1

1

TS2

TS2
BLK

BLK

R+

R+

R-

R-

1

1

Analog Output

Analog Output

2

2

(internally powered)

(internally powered)

1

1

B

B
A

A

-

-

+

+

TS1

TS1

Serial

Serial

2

2

Communication

Communication

1

1
2

2

Frequency

Frequency

Frequency

Frequency

3

3

Output

Output

Output

Output

4

4

1

1

Power Input

Power Input

2

2

Fuse

Fuse

Wiring
Diagram

RUN
EDIT

3/4 A

3/4 A
Slo-Blo

Slo-Blo

1

FLOW

2

FLOW

ENTER

5

110

V

AC

2.6 Grounding requirements

The FMG2550 Series, like all magnetic flow
sensors, is sensitive to electrical noise which is
present in most piping systems. The grounding
procedure illustrated below is necessary in all
installations to insure proper performance.

Connect a local earth ground to the TS5 terminal
strip as illustrated (EG1). If the cable from power
source to the magmeter is less than 200 ft./61m,
EG2 is an acceptable alternative. Using both
EG1 and EG2 is always the best system.

AC+

ACN

Earth Ground #2 (EG2)

24 VDC 1A

Power Supply

-

+

RS485

TS5

4-20 TS3

SHLD
SHLD

24V

4
3
2
1

1

R+

2

R-

TS4

1

B

2

A

TS2

1

BLK

2

RED

3
4

1

-

2

+

TS1

FMG2550 Series

Earth Ground #1

Local

(EG1)

Process Pipe

6

2.7 Installation tips

With moisture
drip loop

Without moisture
drip loop

1. Make sure the Filter function is set to the proper
value for your AC power source (50 or 60 Hz).
(See sec 3.4.4)

2. Allow the magmeter to operate for a period
before attempting to calibrate the unit. The
electronics require a "settling" period during which
the electrode may generate unstable signals.
Thirty minutes to one hour is sufficient.

3. In plastic piping systems, the fluid carries
significant levels of static electricity that must be
grounded for best magmeter performance.

Since plastic pipe is not grounded as metal pipes
are, extra steps must be taken. Identify the places
where the fluid is in electrical contact with external
metal structures or grounds. Connect these points
to TS5 wherever practical.

4. Connect the 24 VDC power and the analog
output signal cables through separate cable ports.
If the frequency output is being used, install a
watertight cable connector in one of the unused
ports. Do not run two cables through one port.
Doing so will defeat the watertight integrity of the
port. (See sec 3.9, spare parts list)

Cable gland

tightened

Cable gland
not tightened

careful cable routing and sealed ports can help prevent water intrusion.

7

Chapter 3

Operation

4 digit liquid crystal display:
"-- -- -- -- --" indicates
reverse flow. All signal
outputs are disabled.

3.1 Control panel description

FLOW

• The

RUN
EDIT

RUN

key switches the display from normal

EDIT

ENTER

operation (RUN) to EDIT, where the calibration

During EDIT mode, all the
output functions of the
magmeter are still active, so
the control process is
uninterrupted.

parameters can be modified.

• The and keys scroll through the menu
selections and edit options.

ENTER

• The

key serves two functions:

1. Selects a particular item from main menu.

2. Stores a new value in calibration functions.

Two lamps on the front panel provide a visual indication of system status:

Indication steady green lamp: normal operation

Indication flashing green lamp: noise level exceeds acceptable

range; all outputs frozen at last value
for 10 seconds.

Indication flashing red lamp: when intermittent flow is detected

8

3.2 Main menu

The menu is constructed in a loop, so you can
move forward and backward to select an item.
After any item is edited, the display will return to
the main menu in the same location where it left
off.

RUN

EDIT

Press the run/edit key
to enter the main menu.

access code

Calibrate functions

Performance functions

Display functions

engineering units

pipe id

low current

High current

Current span

sensitivity

response time

viscosity

filter

custom calibration

user calibration

displayed

electronic calibration
displayed

standard flow

deviation displayed

standard electrical
deviation displayed

9

RUN

EDIT

THIS BASIC OPERATING PROCEDURE REPEATS THROUGHOUT THE FMG2550 SERIES PROGRAM:

1. PRESS

2. P

3. P

RUN

TO ENTER EDIT MENU.

EDIT

RESS / TO MOVE TO A SPECIFIC MENU ITEM.

ENTER

RESS

KEY TO SELECT THE ITEM FOR EDITING.

RESS / /

4. P

5. P

6. P

7. PRESS

ENTER

RESS
RESS / TO SELECT ANOTHER MENU ITEM, OR

TO STORE THE NEW VALUE/SELECTION.

RUN

TO RETURN TO NORMAL OPERATION.

EDIT

ENTER

TO EDIT THE VALUE/SELECTION.

3.2.1 Access code

Without entering the code,
the menu settings can be
viewed, but not edited.

Run/edit key displays first item
in main edit menu.

Enter selects item for editing.

Up arrow advances flashing
digit.

Enter key stores the change
and advances flashing digit.

Up arrow advances flashing
digit.

The main menu begins with a preprogrammed
access code of "1020" which allows editing of
any menu setting.

Step: Press: To display:

1.

2.

3.

4.

5.

6.

7.

ENTER

ENTER

ENTER

Final Enter key returns display
to main edit menu.

10

8.

9.

10.

ENTER

ENTER

Any Function

Any Function

3.3 Calibrate functions

The next five main menu functions are used to input
your specific application data. To edit menu
items, enter code first. (See sec. 3.2.1 above)

3.3.1 Unit

Six engineering unit options are available in the
unit menu. Select one for your flow rate display.

m/s Meters per second
ft/s Feet per second
l/s Liters per second
l/min Liters per minute

GPM U.S. Gallons per minute

3

m

/h Cubic meters per hour

To change the engineering unit selection, first enter
the access code (section 3.2.1) then press the
down arrow until the display shows:

Step: Press: To display:

1.

ENTER

Example illustrates changing
engineering units from
gallons per minute to
liters per minute.

The factory default setting
for Units is GPM

2.

3.

ENTER

Arrow keys advance main menu function;
run/edit key returns to normal operation.

UP arrow key changes setting
.

ENTER key selects new setting
and returns display to main
menu.

11

3.3.2 Interior diameter

You must enter the precise interior diameter of your
pipe as measured during the installation process.
Entry is made in inches when the dimension
entered is less than 40, and automatically switches
to millimeters when the dimension entered is
greater than 40.

The example illustrates setting
id to 10.40 in.

The factory default setting
for id is 2.067 in.

Down arrow key
changes flashing digit.

ENTER key stores new setting
and advances flashing digit.

Down arrow key
changes flashing digit.

Up arrow key changes
flashing digit.

To change the id selection, enter the access code
(section 3.2.1) then press the down arrow until the
display shows:

Step: Press: To display:

1.

ENTER

2.

3.

4.

ENTER

ENTER

5.

6.

7.

ENTER

8.

9.

The decimal point location
is selected after the last
flashing digit is set.

Down arrow key moves
decimal to right.

ENTER key stores final setting
and returns to main menu.

12

10.

11.

ENTER

12.

13.

ENTER

Arrow keys advance main menu function;
run/edit key returns to normal operation.

3.3.3 Current output

The current output of the FMG2550 series is set
via three settings. Low current specifies the flow
rate represented by the minimum current signal
(4 or 0 mA). High current is the flow rate repre­sented by the maximum current (20 mA), and
current selects a 4 to 20 or a 0 to 20 mA span.

To change the current selections, first enter the
access code (section 3.2.1) then press the down
arrow until the display shows:

Step: Press: To display:

1.

2.

3.

4.

5.

6.

Example illustrates setting
current output for
0 to 300 GPM = 4 - 20 mA.

The factory default value for
current is :
0 to 200 GPM = 4 - 20 mA.

Down arrow advances to
next menu item.

7.

ENTER

8.

ENTER

9.

ENTER

10.

11.

ENTER

12.

ENTER

13.

ENTER

14.

15.

ENTER

16.

17.

ENTER

Arrow keys advance main menu function;
run/edit key returns to normal operation.

Up arrow changes flashing
digit.

Press enter 5 times to store the
new setting and return to main
menu.

Down arrow advances to
next menu item.

Arrow keys will toggle setting.

Enter key stores final setting
and returns to main menu.

13

Example illustrates changing
sensitivity setting to 6.

The factory default setting
for sensitivity is 4.

3.4 Performance functions

The next five main menu functions help to tailor the
magmeter signals to your specific environment.

3.4.1 Sensitivity

The sensitivity function limits the amount of refer­ence level noise detected by the magmeter input
circuit. Use the StdE display (sec 3.5.2) to
evaluate the amount of reference noise in your
system. If StdE is greater than 0.05, decreasing
the sensitivity value may stabilize flow readings.

The range selections are from 1 to 10, with 1
representing the most sensitive and 10 the least
sensitive.

To change the sensitivity setting, first enter the
access code (section 3.2.1) then press the down
arrow until the display shows:

Step: Press: To display:

1.

ENTER

Up arrow changes the setting.

The enter key stores the new
setting and returns the display
to the main menu.

14

2.

3.

4.

ENTER

Arrow keys advance to another menu function;
run/edit key returns to normal operation.

3.4.2 Response time

The response time function varies the rate at which
the output functions adjust to changes in the input
signal. For example, if the response time is set at
10 seconds, the current output will take ten
seconds to reflect 95% of any change in flow
signal input .

Use the response time to reduce the effects of
turbulence and steady/periodic noise in the flow.
The standard flow deviation display (sec. 3.5.2)
will help evaluate the need for increased response
time. The options available are Instantaneous, 5,
10, 15, 20, 30, 40, 60, or 80 seconds.

To change the response time setting, first enter the
access code (section 3.2.1) then press the down
arrow until the display shows:

Step: Press: To display:

1.

ENTER

Example illustrates setting
response at 20 seconds.

The factory default setting
for response is 10 seconds.

2.

3.

4.

ENTER

Arrow keys advance to another menu function;
run/edit key returns to normal operation.

Up arrow changes the
setting.

The enter key stores the new
setting and returns the display
to the main menu.

Viscosity ranges

1 = 1 cp
water

2 = 2 cp

3 = 4 cp

4 = 8 cp

5 = N/A- future expansion

The factory default setting
for viscosity is 1.

Press the up arrow to change
the setting to 2.

The enter key stores the new
setting and returns to the main
menu.

3.4.3 Viscosity

Viscosity changes affect the flow profile in the
pipe, and can compromise the accuracy of the
magmeter. This function allows you to compensate
for viscosity. Select a viscosity setting from 1 to 4.
1 represents water, and 2 through 4 represent
increasingly viscous fluids. To change the viscosity
setting, first enter the access code (section 3.2.1)
then press the down arrow until the display shows:

Step: Press: To display:

1.

2.

3.

ENTER

11

ENTER

Arrow keys advance main menu function;
run/edit key returns to normal operation.

3.4.4 AC noise filter

Select 50 Hz or 60 Hz rejection filter according to
the AC power standard in your area.

The factory default setting
for AC filter is 60 cycles.

Press the up or down arrow
to change the setting.

The enter key stores the new
setting and returns to the main
menu.

16

To change the filter setting, first enter the access
code (section 3.2.1) then press the down arrow
until the display shows:

Step: Press: To display:

1.

ENTER

2.

3.

ENTER

Arrow keys advance main menu function;
run/edit key returns to normal operation.

3.4.5 Calibration "B"

The CalB function allows you to compare the
magmeter calibration to your own volumetric or
alternate flow measurement system. The magmeter
stores this flow rate under the display function RatU
(sec. 3.5.1).

The calibration based on the pipe data is still
stored in the memory, and can be recalled by
selecting the display function RatE (sec 3.5.1).

To use CalB, first enter the access code (section

3.2.1) then use the arrow keys until the display
shows:

Calculate the flow rate by
measuring the volume output
for a fixed time period.

volume

÷

time = flow rate

Step: Press: To display:

1.

2.

3.

4.

ENTER

RUN

EDIT

ENTER

ENTER

5.

6.

ENTER

7.

ENTER

8.

ENTER

9.

10.

ENTER

Recall the original calibration by selecting RatE
(See section 3.5.1).

This is current display selection
RatE (see sec 3.5.1)

Now the display has a
flashing digit.

Use the ENTER, UP and
DOWN arrow keys to set the
new flow rate.

When completed, the new
calibration is stored as RatU.
(sec 3.5.1)

Press the ENTER key to
display RatU value.

17

RatE is the factory default
setting.

Example illustrates changing
display setting to StdE.

3.5 Display options

The last four main menu functions change the
displayed information. The first two also change
the output values.

3.5.1 Operational outputs

The "Rate Electronic" and "Rate User" functions
change both the display and the output values in
the magmeter.

• RatE selects the standard calibration value
based on entered pipe id as the basis for all
outputs.

• RatU selects the "Cal B" value as the basis for
all outputs.

Code entry is not necessary to change the display
setting.

Step: Press: To display:

1.

RUN

EDIT

Use the up arrow to move
quickly to the display options.

The display and all outputs
adjust to the new selection
when the enter key is pressed.

18

2.

3.

4.

5.

6.

ENTER

3.5.2 Diagnostic displays

The diagnostic displays are used to evaluate
abnormalities in the process stream.

• The standard electrical deviation (StdE) is
related to the level of electrical fluctuation in the
input signal reference. The value is displayed in
terms of volts, ie "0.02" represents 20 millivolts.
Nominal values range from 50 mV at low velocities
to 80 mV at maximum velocity. Higher values
indicate excessive fluid noise levels, or inadequate
earth ground. Use the Sensitivity adjustment (sec

3.4.1) to compensate and check the grounding
requirements (sec. 2.6).

• The standard flow deviation (StdF) is an overall
indication of the stability of the flow signal. It
incorporates the StdE, as well as mechanical factors
such as unstable flow profiles, misaligned sensors,
and coated electrodes. StdF is displayed as a
percentage of flow rate, typically from 5 to 8%.
StdF levels in excess of 10% indicate inadequate
installation or application standards.

If StdE value is high, the StdF will always be high.

If StdE is low but StdF is high, look for causes
related to sensor location, such as insufficient
upstream straight runs and sensor alignment. If the
StdF cannot be corrected by modifying the
installation, the Response function (sec 3.4.2) will
help to smooth the output signals.

Code entry is not necessary to change the display
setting.

Step: Press: To display:

1.

RUN

EDIT

2.

3.

ENTER

Example illustrates changing
display setting to StdE.

Use the up arrow to move
quickly to the display options.

RatE is the factory default
setting.

Selecting the StdE or StdF
diagnostic displays will not
affect or interrupt the outputs.

19

3.6 Frequency output

The frequency output from the FMG2550 Series is
an open collector signal that requires a 5 to 12
VDC reference.

Black (+V)

2KΩ

FMG2550

5 to 12 VDC in

Red (Signal out)

TS 2

Shield (Ground)

3.6.1 Product compatibility

If using the OMEGA FPM-9010A flow controller,
set input card switches for "1001" (5 VDC power
to sensor with pull up resistor).

3.7 Calibration data

Pipe type pipe pipe gpm/fps lpm/fps K A K A

size id pls/gal gpm/Hz pls/l lpm/Hz

U.S. pipe data
PVC sched 80 2 in. 1.91 8.95858 33.912 167.44 0.36 44.23 1.36
PVC sched 40 2 in. 2.05 10.2576 38.829 146.23 0.41 38.63 1.55
steel sch 5S 2 in. 2.25 12.3379 46.704 121.58 0.49 32.12 1.87
steel sch 10S 2 in. 2.16 11.3896 43.115 131.70 0.46 34.79 1.72
steel sch 40S 2 in. 2.07 10.459 39.592 143.42 0.42 37.89 1.58
steel sch 80S 2 in. 1.94 9.20375 34.84 162.98 0.37 43.05 1.39
PVC sched 80 2.5 in. 2.29 12.8375 48.596 116.85 0.51 30.87 1.94
PVC sched 40 2.5 in. 2.45 14.6341 55.397 102.50 0.59 27.08 2.22
steel sch 5S 2.5 in. 2.71 17.965 68.005 83.50 0.72 22.06 2.72
steel sch 10S 2.5 in. 2.64 16.9969 64.341 88.25 0.68 23.31 2.57
steel sch 40S 2.5 in. 2.47 14.8228 56.49 101.20 0.59 26.55 2.26
steel sch 80S 2.5 in. 2.32 13.2101 50.006 113.55 0.53 30.00 2.00
PVC sched 80 3 in. 2.86 20.0796 76.01 74.70 0.80 19.73 3.04
PVC sched 40 3 in. 3.04 22.6531 85.752 66.22 0.91 17.49 3.43
steel sch 5S 3 in. 3.33 27.2107 103 55.13 1.09 14.56 4.12
steel sch 10S 3 in. 3.26 26.0162 98.483 57.66 1.04 15.23 3.94
steel sch 40S 3 in. 3.07 23.042 87.224 65.10 0.92 17.20 3.49
steel sch 80S 3 in. 2.90 20.5876 77.933 72.86 0.82 19.25 3.12

20

Pipe type pipe pipe gpm/fps lpm/fps K A K A

size id pls/gal gpm/Hz pls/l lpm/Hz
PVC sched 80 3.5 in. 3.33 27.0803 102.51 55.39 1.08 14.63 4.10
PVC sched 40 3.5 in. 3.52 30.3488 114.88 49.43 1.21 13.06 4.60
steel sch 5S 3.5 in. 3.83 35.9843 136.22 41.68 1.44 11.01 5.45
steel sch 10S 3.5 in. 3.76 34.6087 131.01 43.34 1.38 11.45 5.24
steel sch 40S 3.5 in. 3.55 30.816 116.65 48.68 1.23 12.86 4.67
steel sch 80S 3.5 in. 3.36 27.7026 104.87 54.15 1.11 14.30 4.19
PVC sched 80 4 in. 3.79 35.089 132.83 42.75 1.40 11.29 5.31
PVC sched 40 4 in. 4.00 39.1289 148.12 38.33 1.57 10.13 5.92
steel sch 5S 4 in. 4.33 45.9819 174.06 32.62 1.84 8.62 6.96
steel sch 10S 4 in. 4.26 44.4251 168.17 33.76 1.78 8.92 6.73
steel sch 40S 4 in. 4.03 39.6786 150.2 37.80 1.59 9.99 6.01
steel sch 80S 4 in. 3.83 35.8343 135.65 41.86 1.43 11.06 5.43
PVC sched 80 5 in. 4.77 55.6521 210.67 26.95 2.23 7.12 8.43
PVC sched 40 5 in. 5.02 61.592 233.15 24.35 2.46 6.43 9.33
steel sch 5S 5 in. 5.35 69.9366 264.74 21.45 2.80 5.67 10.59
steel sch 10S 5 in. 5.30 68.6343 259.81 21.85 2.75 5.77 10.39
steel sch 40S 5 in. 5.05 62.3557 236.04 24.06 2.49 6.35 9.44
steel sch 80S 5 in. 4.81 56.7076 214.66 26.45 2.27 6.99 8.59
PVC sched 80 6 in. 5.71 79.7865 302.03 18.80 3.19 4.97 12.08
PVC sched 40 6 in. 6.03 89.0406 337.06 16.85 3.56 4.45 13.48
steel sch 5S 6 in. 6.41 100.489 380.4 14.93 4.02 3.94 15.22
steel sch 10S 6 in. 6.36 98.9267 374.48 15.16 3.96 4.01 14.98
steel sch 40S 6 in. 6.07 90.0473 340.87 16.66 3.60 4.40 13.63
steel sch 80S 6 in. 5.76 81.2466 307.55 18.46 3.25 4.88 12.30
PVC sched 80 8 in. 7.57 140.096 530.33 10.71 5.60 2.83 21.21
PVC sched 40 8 in. 7.94 154.408 584.5 9.71 6.18 2.57 23.38
steel sch 5S 8 in. 8.41 173.018 654.95 8.67 6.92 2.29 26.20
steel sch 10S 8 in. 8.33 169.822 642.85 8.83 6.79 2.33 25.71
steel sch 40S 8 in. 7.98 155.928 590.26 9.62 6.24 2.54 23.61
steel sch 80S 8 in. 7.63 142.328 538.77 10.54 5.69 2.78 21.55
PVC sched 80 10 in. 9.49 220.605 835.09 6.80 8.82 1.80 33.40
PVC sched 40 10 in. 9.98 243.625 922.23 6.16 9.75 1.63 36.89
steel sch 5S 10 in. 10.48 268.966 1018.2 5.58 10.76 1.47 40.73
steel sch 10S 10 in. 10.42 265.794 1006.1 5.64 10.63 1.49 40.24
steel sch 40S 10 in. 10.02 245.779 930.38 6.10 9.83 1.61 37.22
steel sch 80S 10 in. 9.75 232.712 880.92 6.45 9.31 1.70 35.24
PVC sched 80 12 in. 11.29 312.252 1182 4.80 12.49 1.27 47.28
PVC sched 40 12 in. 11.89 346.019 1309.8 4.34 13.84 1.15 52.39
steel sch 5S 12 in. 12.44 378.713 1433.6 3.96 15.15 1.05 57.34
steel sch 10S 12 in. 12.39 375.796 1422.6 3.99 15.03 1.05 56.90
steel sch 40S 12 in. 12.00 352.51 1334.4 4.26 14.10 1.12 53.38
steel sch 80S 12 in. 11.75 337.975 1279.4 4.44 13.52 1.17 51.18

21

DIN Standard Plastic Pipe

Pipe type pipe pipe gpm/fps lpm/fps K A K A

size id pls/gal gpm/Hz pls/l lpm/Hz
PP bar 10 63 51.4 10.02 37.943 149.63 0.40 39.53 1.52
PP bar 10 75 61.2 14.21 53.791 105.55 0.57 27.89 2.15
PP bar 10 90 73.6 20.55 77.797 72.98 0.82 19.28 3.11
PP bar 10 110 90 30.73 116.33 48.81 1.23 12.89 4.65
PP bar 10 125 102.2 39.63 150.01 37.85 1.59 10.00 6.00
PP bar 10 140 114.4 49.66 187.96 30.21 1.99 7.98 7.52
PP bar 10 160 130.8 64.92 245.71 23.11 2.60 6.10 9.83
PP bar 10 180 147.2 82.22 311.19 18.24 3.29 4.82 12.45
PP bar 10 200 163.6 101.56 384.39 14.77 4.06 3.90 15.38
PP bar 10 225 184 128.46 486.23 11.68 5.14 3.08 19.45
PP bar 10 250 204.4 158.53 600.03 9.46 6.34 2.50 24.00
PP bar 10 280 229 198.98 753.14 7.54 7.96 1.99 30.13
PP bar 10 315 257.6 251.79 953.01 5.96 10.07 1.57 38.12
PVDF bar 10 90 84.4 27.03 102.3 55.50 1.08 14.66 4.09
PVDF bar 10 110 103 40.25 152.36 37.26 1.61 9.84 6.09
PVDF bar 10 160 150 85.37 323.14 17.57 3.41 4.64 12.93
PVDF bar 10 200 187.6 133.54 505.44 11.23 5.34 2.97 20.22
PVDF bar 10 250 234.8 209.19 791.78 7.17 8.37 1.89 31.67
PVDF bar 16 63 57 12.33 46.661 121.67 0.49 32.15 1.87
PVDF bar 16 75 67.8 17.44 66.019 86.00 0.70 22.72 2.64
PVDF bar 16 90 81.4 25.14 95.161 59.66 1.01 15.76 3.81
PVDF bar 16 110 99.4 37.49 141.9 40.01 1.50 10.57 5.68
PVC bar 10 63 57 12.33 46.661 121.67 0.49 32.15 1.87
PVC bar 10 75 67.8 17.44 66.019 86.00 0.70 22.72 2.64
PVC bar 10 90 81.4 25.14 95.161 59.66 1.01 15.76 3.81
PVC bar 10 110 99.4 37.49 141.9 40.01 1.50 10.57 5.68
PVC bar 10 125 113 48.45 183.39 30.96 1.94 8.18 7.34
PVC bar 10 140 126.6 60.81 230.18 24.67 2.43 6.52 9.21
PVC bar 10 160 144.6 79.34 300.29 18.91 3.17 5.00 12.01
PVC bar 10 180 162.8 100.57 380.64 14.92 4.02 3.94 15.23
PVC bar 10 200 180.8 124.03 469.47 12.09 4.96 3.20 18.78
PVC bar 10 225 203.4 156.98 594.17 9.56 6.28 2.52 23.77
PVC bar 16 63 53.6 10.90 41.261 137.60 0.44 36.35 1.65
PVC bar 16 75 63.8 15.44 58.459 97.12 0.62 25.66 2.34
PVC bar 16 90 76.6 22.26 84.269 67.37 0.89 17.80 3.37
PVC bar 16 110 93.6 33.24 125.82 45.12 1.33 11.92 5.03
PVC bar 16 125 106.4 42.96 162.59 34.92 1.72 9.23 6.50
PVC bar 16 140 119.2 53.91 204.06 27.82 2.16 7.35 8.16
PVC bar 16 160 136.2 70.39 266.42 21.31 2.82 5.63 10.66

22

3.8 Custom K-factor calculation

K-factors can be calculated for any pipe using the
pipe id and the ft/s engineering unit options. The
procedure is based on the relationship between
the frequency output and the flow velocity:

20 ft/s = 500 Hz. therefore 1 ft/s = 25 Hz.

1. Install the FMG2550 Series Magmeter in pipe
according to sec 2.2.

2. Enter the pipe ID into the menu, and select feet
per second (FPS) as the engineering unit.

3. Establish a stable flow rate in the pipe. It is not
important to know what the rate is, just that the
rate be stable.

4. Read the flow rate from display and multiply
the display value (ft/s) by 25. (frequency can
be verified by monitoring TS2 if desired.)

Record the result _____ ft/s = ________Hz.

5. Change the display to read in desired
engineering units. Do not change flow rate!

Record the result _____GPM = ________Hz.

6. Divide the flow rate by the frequency result of
step 3. Record the result:

Example illustrates calculating
a custom K-factor in GPM for
pipe with 3.068 in. id.

Unit = ft/s

Display = 5.2 ft/s

5.2 x 25 = 130 Hz

5.2 ft/s = 130 Hz.

Unit = GPM
Display = 120 GPM

120 GPM = 130 Hz.

Flow Rate/Hz = A =_______________

7. K = 60 / A = _________________

A = 120 ÷ 130 = 0.92

K = 60 ÷ 0.92 = 65.2

23

3.9 Spare parts list

2

3

1

1. Access cover 3-2550.374

2. Gasket, outer cover 1222-0439

3. Cable connector* (standard)
for .125 to .187 o.d. cable FMG255-F
Cable connector (optional)
for .187 to .250 od cable 1500-0102

4. Fuse, 3/4 A slo-blo FMG255-CP

5. Installation tool FMG255-T

*

Additional connector sizes available

from Hubbell Inc.:

Cable diameter Hubbell part no.

0.250 to 0.312 #SHC-1010-ZP

0.312 to 0.375 #SHC-1011-ZP

0.375 to 0.437 #SHC-1012-ZP

Hubbell Incorporated
State Street and Bostwick Avenue
Bridgeport Connecticut 06605-0933
Phone: [phone]
Fax: [phone]

24

General Data

Flow velocity range: 0.1 to 6 m/s

(0.3 to 20 ft/s)

Accuracy: ±2% of reading or

±0.05 ft/s whichever
is greater

Temperature coefficient: ≤0.015% per °C

Pipe size: 51 to 305 mm

(2 to 12 in.),
metal or plastic

Response time: User Selectable:

instantaneous/5/10/15/
20/30/40/60/80 s.

Isolated current output: 4 to 20 mA or 0 to 20 mA,

into 600 Ω max. load

Frequency output: 0 to 20 ft/s = 0 to 500 Hz

isolated, open collector
50% duty cycle, (5 to 12 VDC)

Specifications

25

Materials

Enclosure: Die cast aluminum,

Nema 4/IP65

Sensor body: 316 stainless steel

Sensor tip: PFA Sealing tape®

Electrodes: 316 stainless steel

Retaining ring: 316 stainless steel

Threaded nut: 316 stainless steel

Internal o-ring: FPM Viton®

Electrical Data

Power Requirements: 24 VDC ± 10%, 600 mA
Recommended power supply (or equivalent):
OMEGA Part # U24Y101

Magnetic field: Bipolar DC

26

Input signal impedance: >10000 MΩ

Ambient Conditions

Humidity: 100% RH,non-condensing

Liquid temperature: 0 to 100°C

(32 to 212 °F)

Ambient temperature: -20 to 80°C

(-4 to 176°F)

Minimum liquid conductivity: 5 µS/cm

Maximum operating pressure: 17 bar (250 psig)

27

Notes:

28

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a
period of 13 months from 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 returned to the factory for evaluation. OMEGA’s Customer Service
Department will issue an Authorized Return (AR) number immediately upon phone or written request.
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,
including but not limited to mishandling, improper interfacing, operation outside of design limits,
improper repair, 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 corrosion;
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA’s control. Components which wear are not warranted, including but not
limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any
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 it
will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF
TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of
OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for
consequential, 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
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility
as set forth in our basic WARRANTY / DISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.

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) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID
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.

FOR

WARRANTY RETURNS, please have the
following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which the

product 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 2000 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 NON-WARRANTY REPAIRS,
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

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

Shop online at www.omega.com

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6-2550.090-OM/(F-8/02) M-2974/0802