Omega Products FMG-900 Installation Manual

User's Guide

Shop online at

omega.com

email: [e-mail]

For latest product manuals:

omegamanual.Info

FMG-900 SERIES

Insertion Magnetic Flow Meter

Servicing North America:

U.S.A.: One Omega Drive, P.O. Box 4047

ISO 9001 Certified

Stamford, CT 06907-0047
TEL: [phone] FAX: [phone]
e-mail: [e-mail]

Canada: 976 Bergar

Laval (Quebec) H7L 5A1, Canada
TEL: [phone] FAX: [phone]
e-mail: [e-mail]

For immediate technical or application assistance:

U.S.A. and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA

®

Customer Service: 1-800-622-2378 / 1-800-622-BEST

®

Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN

®

TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA

Mexico: En Espan˜ol: [phone]-7803 e-mail: [e-mail]

FAX: [phone] [e-mail]

Servicing Europe:

Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands

TEL: [phone] FAX: [phone]
Toll Free in Benelux: 0800 0993344
e-mail: [e-mail]

Czech Republic: Frystatska 184, 733 01 Karviná, Czech Republic

TEL: [phone] FAX: [phone]
Toll Free: 0800-1-66342 e-mail: [e-mail]

France: 11, rue Jacques Cartier, 78280 Guyancourt, France

TEL: [phone] FAX: [phone]
Toll Free in France: 0800 466 342
e-mail: [e-mail]

Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany

TEL: [phone] FAX: [phone]
Toll Free in Germany: 0800 639 7678
e-mail: [e-mail]

United Kingdom: One Omega Drive, River Bend Technology Centre

ISO 9002 Certified

Northbank, Irlam, Manchester
M44 5BD United Kingdom
TEL: [phone] FAX: [phone]
Toll Free in United Kingdom: 0800-488-488
e-mail: [e-mail]

OMEGAnet®Online Service Internet e-mail

omega.com i n f o @ o m e g a . c o m

It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI
regulations that apply. OMEGA is constantly pursuing certification of its products to the European New
Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

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

GENERAL INFORMATION

The complete lack of moving parts of this insertion flow sensor
is the source of its reliability. There is no rotor to stop turning
in dirty water and there are no bearings to wear out. Brass
and stainless steel models withstand a variety of temperature,
pressure, and chemical conditions. Reverse flow output and
immersibility are optional.

A rapidly reversing magnetic field is produced in the lower
housing. As the fluid moves through this field, a voltage is
generated that is measured and translated into a frequency

FEATURES

Cable strain relief

Rugged cast aluminum housing
Brass or 316 stainless shaft
Compression nut

Adapter fitting

signal proportional to flow rate. This square wave signal can
be sent directly to a PLC or other control or can be converted
using any of the Omega family of indicators and converters.

The adapter fitting of the FMG-900 Series sensor is standard
male NPT, and can be directly threaded into ordinary saddles
or threaded weld fittings. The FMG905 and 906 include an
isolation valve, allowing hot-tap installation, or installation and
removal under pressure. A bronze ball valve is standard, with
a 316 stainless steel valve optional.

Housing screw (connect ground to one)

FMG901/902

Sensor housing

Electrodes and cap

SPECIFICATIONS

Power Full Power

Low Power

Flow Range

Fitting Size

Temperature Ambient

Fluid

Pressure

Minimum Conductivity

Materials Shaft/Fitting

Electrodes

Electrode Cap

Housing

Valve Assembly
(905/906 Only)

O-Ring
(905/906 Only)

Calibration Accuracy

Output

Empty Pipe Detection

FMG905/906

Valve assembly for
hot tap installation

12-24 Vdc, 250 mA

12-24 Vdc, 40 mA

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

FMG901/902 FMG905/906

1-1/2” Male NPT 2” Male NPT

0˚ to 180˚ F (-17˚ to 82˚ C)

32˚ to 200˚ F (0˚ to 93˚ C)

200 psi (13.8 bar)

20 microSiemens/cm

316 SS or Brass

Hastelloy

PVDF

Cast aluminum, powder-coated

Bronze (stainless optional) with bronze ball valve

EPDM

+/- 1% of full scale

Square wave pulse, opto isolated, 550 Hz @ 20 ft/sec
6 mA max, 30 Vdc forward flow standard; reverse flow optional

Software, defaults to zero flow

INSTALLATION

Piping. For best results, the FMG-900 Series sensor should

be installed with at least ten diameters of straight pipe
upstream and five downstream. Certain extreme situations
such as partially-opened valves are particularly difficult and
may require more straight diameters upstream (see Straight
Pipe Recommendations).

DISTORTED FLOWS

Faster Flow
Causes Meter

Distorted
Flow Profile

To Read High

FLOW

10X

5X

POSITIONING THE METER

Fair (Unacceptable if

air is present)

Best
Position

Fair (Unacceptable if fluid

contains sediment)

Immersion. The FMG901/902 Series standard sensors
are not designed for continuous underwater operation.

Chemical Injection or Fertigation. When any magmeter,
by any manufacturer, is used in a chemical injection ap­plication (including fertigation), the chemical line must be
placed downstream of the magmeter OR far enough up­stream for complete mixing to occur before the fluid 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 flow of
fluid of uniform conductivity.

Caution: In chemical injection or fer­tigation applications, install chemical
line downstream of magmeter, or far
enough upstream to allow complete

mixing of fluids before the meter.

Horizontal is the preferred installation orientation, since it

improves low-flow per formance and avoids problems with

trapped air and sediment. Bottom, top, and vertical pipe

installations are all acceptable if required by the piping

layout (See Full Pipe Recommendations).

Caution: These flow sensors are not
recommended for installation down­stream of a boiler feedwater pump

where installation fault may expose
the flow sensor to boiler pressure and tempera­ture. Maximum recommended temperature is
200°F.