Omega Products FMG-900 Installation Manual

FMG-900 SERIES

Insertion Magnetic Flow Meter

User's Guide

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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.

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

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.

GENERAL INFORMATION

FEATURES

Valve assembly for

hot tap installation

FMG905/906

Brass or 316 stainless shaft

Rugged cast aluminum housing

Adapter fitting

Compression nut

Sensor housing

Electrodes and cap

Housing screw (connect ground to one)

Cable strain relief

FMG901/902

SPECIFICATIONS

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

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

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).

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 ap-

plication (including fertigation), the chemical line must be

placed downstream of the magmeter OR far enough up-

stream 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: These flow sensors are not

recommended for installation down-

stream of a boiler feedwater pump

where installation fault may expose

the flow sensor to boiler pressure and tempera-

ture. Maximum recommended temperature is

200°F.

INSTALLATION

DISTORTED FLOWS

FLOW

POSITIONING 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).

Fair (Unacceptable if

air is present)

Best

Position

Fair (Unacceptable if fluid

contains sediment)

Faster Flow

Causes Meter

To Read High

10X

5X

Distorted

Flow Profile

Caution: In chemical injection or fer-

tigation applications, install chemical

line downstream of magmeter, or far

enough upstream to allow complete

mixing of fluids before the meter.