Omega Products FMG-1000-MAW Installation Manual

User's Guide

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FMG-1000-MAW

Blind Analog Transmitter

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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.

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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, SPECIFICATIONS and INSTALLATION

Load vs. Supply Voltage

GENERAL INFORMATION

The Omega FMG-1000-MAW is a blind (non-indicating) 4-20 mA

transmitter, designed for use with almost all Omega ow sen­sors. It accepts a pulse frequency input from the ow sensor,

and converts this input into a continuous analog output signal.
Power for the transmitter is taken from the current loop itself,
so only two wires are required. The digital design makes it pos-

sible to span the unit in the eld without tools. The frequency at

which 20 mA is desired is entered on a set of rotary switches,
and an internal microcontroller automatically scales all other

values accordingly. An additional benet of the microcontroller

is its ability to average inputs, for smoothing of the output signal.

The degree of averaging can be selected in the eld, from 2 to

16 seconds.

For maximum environmental protection, the electronic compo-

nents are encased in a special semi-exible urethane potting

material. The housing is cast from aluminum and fuse-coated.
The clamshell housing is provided with mounting feet for remote
mounting.

The FMG-1000-MAW will operate on a relatively wide range of
current loop voltages, 24 to 36 Vdc. Lower voltages limit the load
that can be applied to the loop without distortion of the signal.
(See Load/Supply chart if there is a question regarding voltage
vs. load.) A built-in power regulator supplies the appropriate

power to the ow sensor.

INSTALLATION

Mounting. The FMG-1000-MAW comes with mounting feet

and requires four screws to attach it to any stable surface.

Connection. The upper portion must be removed to make
connections. Use a standard hex wrench (5/32” or 4 mm)
to loosen the screws, then remove the upper half. The
connections are made to terminal blocks in the upper half,
which contains the potted electronics.

Consult the Connections diagram before connecting to
the current loop. On an FMG-1000-MAW, the sensor must
be connected, since it is remote from the transmitter. Be

careful to follow the color coding of the ow sensor wires

in order to establish the correct polarity. Incorrect polarity
can damage the sensor.

Typical applications for this transmitter are telemetry (or SCADA),
distributed control systems, programmable controllers, data
logging, and chart recording.

SPECIFICATIONS*

Power

Temperature

Input

Input Averaging

Response Time

Frequency Minimum

Maximum

Setting

Output

*Specications subject to change

24 - 36 Vdc

32˚ - 130˚ F (0˚ - 55˚ C)

Open-collector solid state sensor

2 - 16 seconds (switch selectable)

2-60 seconds; 90% of full scale
(dependent on input averaging)

10 Hz (@20 mA)

999.9 Hz

4 Rotary DIP switches

Proportional 4-20 mA

Loop
Power
(Vdc)

36

34

Operating

Region

32

30

28

26

24

700 900 1100 1300

Load Resistance (Ohms)

1500