Omega FMG80A User guide

User’s Guide

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SM

FMG80A SERIES

Low-Flow Magmeter

omega.com [email protected]

Servicing North America:

U.S.A. Omega Engineering, Inc.
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

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.

TABLE OF CONTENTS

FMG80A-SERIES INSTRUCTIONS

General Information

General Information ...............................................................................................................................................................Page 4

Features .....................................................................................................................................................................................Page 4

Specications ............................................................................................................................................................................Page 5

Dimensions ................................................................................................................................................................................Page 6

Pressure Drop Curve ..............................................................................................................................................................Page 6

Installation

Positioning .................................................................................................................................................................................Page 7

Mounting ....................................................................................................................................................................................Page 7

Piping ...........................................................................................................................................................................................Page 7

Power Supply ............................................................................................................................................................................Page 7

Grounding ..................................................................................................................................................................................Page 7

Connections

General Connection Information ......................................................................................................................................Page 8

4-20 mA Device with Single Power Supply ...................................................................................................................Page 8

Dual Power Supply with Loop Isolation ..........................................................................................................................Page 8

Operation

General Operation Information .........................................................................................................................................Page 9

Troubleshooting

Problem .......................................................................................................................................................................................Page 9

Probably Causes.......................................................................................................................................................................Page 9

Things to Try .............................................................................................................................................................................. Page 9

Page 3 omega.com

GENERAL INFORMATION

FMG80A-SERIES INSTRUCTIONS

The FMG80A magmeter is designed for low-ow chemical
injection or difcult-to-meter applications with pulsating

metering pumps in 3/4” to 1/4” pipe/tube. The housing is
made of sturdy splashproof HDPE plastic.

With no moving parts, the FMG80A can handle uids

containing particulate matter without clogging or jamming,
keeping maintenance at a minimum. With no metallic parts

(100% PVDF body and PVDF carbon ber-lled electrodes),

the meter is corrosion-resistant and compatible with a
wide range of chemicals (consult factory for chemicals and

concentrations). Accuracy is maintained with conductive
uids (>20 microSiemens) of varying viscosities and

densities.

FEATURES

8-pin circular bulkhead connector, 20 foot (6 meter) cable provided

The FMG80A meter is compact enough to t most pump/

injection systems. With zero straight pipe required after
an elbow, it can be easily mounted in tight spaces. The
mounting bracket adds stability.

The FMG80A meter has an optoisolated current sinking
pulse output that can be connected to many Omega rate/
total displays or batch processors, as well as to a 4-20
mA current loop for analog devices. Outputs and power
are provided through a cable with 8-pin female circular
connector.

Mounting bracket

Internals made of chemical and corrosion-resistant PVDF

Sturdy HDPE housing

½” male NPT

ttings standard

Threaded male or female NPT adapters

can be purchased separately

(available in PVDF and PP)

(Female NPT available in 1/2” only)

Page 4 omega.com

GENERAL INFORMATION

FMG80A-SERIES INSTRUCTIONS

Specications*

Pipe Size 3/4”, 1/2”, 3/8”, 1/4” **

Fittings 1/2” NPT ttings standard in 3/4” or 3/8” owbody. NPT threaded adapters available for above

Materials Body PVDF

Electrodes PVDF carbon ber lled

Ground PVDF carbon ber lled

Housing HDPE with 25% glass

Adapters (NPT) Polypropylene or PVDF

Temperature Ambient 0˚ to 130˚ F (-18˚ to 54˚ C)

Fluid 32˚ to 200˚ F (0˚ to 93˚ C)

Pressure 150 psi

Flow Range FMG83A, FMG84A 20 GPM max. (0.2 GPM cutoff)

FMG81A, FMG82A 3 GPM max. (0.03 GPM cutoff)

Accuracy FMG83A, FMG84A ±1% plus ±0.005 GPM of reading across rated range

FMG81A, FMG82A ±1% plus ±0.002 GPM of reading across rated range

Output Signal Optoisolated current sinking or current sourcing pulse output: 30 Vdc, 5 mA max

FMG83A, FMG84A 500 pulses/liter (1892 pulses/gallon)

FMG81A, FMG82A 1000 pulses/liter (3785 pulses/gallon)

Power 10–15 Vdc, 150 mA (linear power supply recommended)

Conductivity >20 microSiemens

Empty Pipe Detection Hardware/software, conductivity-based

Environmental

* Specications subject to change • Please consult our website for current data (www.omega.com).
** Requires adaptors

NOTE: Consult factory for applications owing sodium hypochlorite, sodium chlorite, sodium chlorate.

For applications with the listed chemicals, the following conditions apply:

• Max concentration 15% / Max temperature 100˚ F

• Flow is greater than 20% of max for accurate reading

pipe sizes.

Optoisolated 4-20 mA current loop: 7 Vdc plus load voltage drop min; 50 Vdc max

NEMA 4X standard; IP66 splashproof standard

Page 5 omega.com

GENERAL INFORMATION

D

C

B

8

7

6

5

4

3

2

1

4.2"

2.1"

-038

.19

-075

.50

D

C

8

7

6

5

4

3

2

1

Dimensions

FMG80A-SERIES INSTRUCTIONS

Mounting
Bracket

7.2” (18.3 cm) (with adapters as shown)

7.2" (WITH ADAPTERS AS SHOWN)

4.2” (10.7 cm) (meter without adapters)

4.2" (METER WITHOUT ADAPTERS)

3.5”

3.5"

(8.9 cm)

2.0”

2.0"

(5.0 cm)

7.2” (18.3 cm) (with adapters as shown)

7.2" (WITH ADAPTERS AS SHOWN)

4.2" (METER WITHOUT ADAPTERS)

4.2” (10.7 cm) (meter without adapters)

4.2” (10.7 cm)

4.2"

2.1"

2.1” (5.3 cm)

Meter ID

-038 0.19”

-038

.19

-075

.50

-075 0.50”

3.5”

3.5"

(8.9 cm)

2.0"

2.0”

(5.0 cm)

Pressure Drop Curve

-038

3

FMG83A/FMG84A with 3/4” adapters.
FMG81A/FMG82A with 3/8” adapters.

Actual curve dependant on pipe size/ttings

-075

Page 6 omega.com

INSTALLATION

FMG80A-SERIES INSTRUCTIONS

Positioning

The FMG80A can be mounted vertically or horizontally. It
is important to choose a position that will ensure full pipe.
(Under certain conditions of empty or partially-full pipe

the meter may give a pulse out when there is no ow.)

With a zero straight pipe requirement after an elbow, the
FMG80A meter can be installed in tight spaces.

FLOW

FLOW

FLOW

Mounting

It is highly recommended to use the mounting bracket
provided. The mounting bracket uses two #8 screws on a

1.5” center.

Piping

Metal pipe, metal tube, or plastic tubing can be used with

the meter. The standard NPT ttings can be used with or

without NPT adapters on 3/4” or 3/8” pipe. If used, apply

Teon tape onto the NPT ttings. NPT adapters should be
hand tightened onto the ttings. Thoroughly clean the
pipe threads and nose and apply Teon tape to adapter

threads. Hold adapters with a wrench while tightening the
pipe to prevent damage to the meter.

Power Supply

A 12 Vdc linear, regulated power supply with an output
current of at least 0.25A is recommended. If a switching
power supply must be used, consult Omega for approved
manufacturer’s model numbers.

Grounding

In addition, it is necessary for proper operation to ground
the unit to a good quality earth ground. Assure negative
power supply is grounded to earth and to the entire
electrical/mechanical system. If metal piping is used,
jumper inlet and outlet pipes together and connect to
ground for best results in metering accuracy. The cable
shield drain wire should be left unconnected.

The FMG80A may be supported by its piping connections
IF the piping is rigid. The meter and pipe must be perfectly

aligned with no exion at the ttings to prevent leakage or

damage to the meter.

Page 7 omega.com

CONNECTIONS

Green

Green

FMG80A-SERIES INSTRUCTIONS

Power and signal connections are provided through the
8-pin male bulkhead connector on the meter housing

(20 ft (6 m) cable provided). See the Pin Assignment and

Connections diagrams.

4-20 mA Device and FMG80 with Single Power Supply

Important: 4-20mA device input resistance must not exceed 250 Ω

_

4-20 mA

device

+

7

4

Blue

FMG80A

_

12–15

Vdc

+

4-20 mA

loop

5

4

6

3 7

8

2

Cable Plug Contact

Arrangement

Power

Brown

2

White

1

3

8

1

_

+

DISPLAY

_

S

+

Pin # Function Color

1 Pulse (-) White

2 Ground Brown

3 Pulse (+) Green

4 4-20 (+) Yellow

5 Not used Grey

6 Not used Pink

7 4-20 (-) Blue

8 Power (+) Red

May be external
or internal to the
display device

May be external
or internal to the
display device

4-20 mA

_

24

Vdc

+

loop

Sensor Input

Yellow

Red

Dual Power Supply with Loop Isolation

_

4-20 mA

device

+

7

4

Blue

FMG80A

Yellow

2

8

1

3

Brown

White

Red

Power

_

+

DISPLAY

_
S

+

Sensor Input

_

12–15

Vdc

+

May be external
or internal to the
display device

Page 8 omega.com

OPERATION AND TROUBLESHOOTING

OPERATION

FMG80A-SERIES INSTRUCTIONS

The meter will output one pulse when powered up. The
newly-installed meter takes from a few seconds to a minute
for the signal to stabilize at startup, especially if it has been

dry. In normal operation, keep the meter lled with uid

and powered on to prevent this delay. When the meter
is mounted properly, an empty pipe detection feature will
normally detect absence of liquid in the pipe and register

zero ow.

The 4-20 mA signal outputs 4 mA at zero ow and 20 mA at
20 gallons/minute ow or 3 gallons per minute, depending

on model.

The pulse signal is a 50% duty cycle pulse set at:

FMG83A/FMG84A:

500 pulses/liter (1892 pulses/gallon)

FMG81A/FMG82A:

1,000 pulses/liter (3785 pulses/gallon)

TROUBLESHOOTING

Problem Probable Causes Things to try…

No output Reversed ow direction Reverse ow connections

Empty pipe Check piping conditions

Flow rate below minimum Select a different ow meter

Loose or incorrect wiring Check electrical connections

Fluid conductivity too low Select a different ow meter

Electrical noise Relocate meter or reduce noise

Flow rate incorrect Fluid conductivity too low Select a different ow meter

Empty pipe Check piping conditions

Electrical noise Relocate meter or reduce noise

Page 9 omega.com

NOTES

FMG80A-SERIES INSTRUCTIONS

Page 10 omega.com

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 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 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 the
company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED 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 2016 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,
OMEGA 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

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

Shop online at omega.com

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