Omega Products FLMG Installation Manual

Flow Transmitter s

FLMG, FLMH and FLMW Series

with the -MA Option

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.

NOTE: Refer to Omega’s “Operation & Maintenance Guide” for installation,
operation and cleaning instructions for the basic flow monitor cartridge.
The following instructions are specifically for monitors with electrical switches
for flow alarms. This is an addendum to the basic flow monitor instructions.

General Information

Omega’s Flow Transmitters are typically used to transmit a signal
proportional to flow rate to a process control computer, a PLC, a
recorder, or a panel-mount display. The Flow Transmitters are used
as the primary input device to record flow rates through hydraulic and
pneumatic systems.

The universal output transmitter circuit employed by the Omega Flow
Transmitter is capable of producing output signals of 4-20 mA, 0-5
VDC, and 0-2000 Hz square wave pulse. A1-5 VDC signal may be
obtained by placing a 249

Ω resistor within the 4-20 mA loop.

Overview

Illustration 1 shows a Flow Transmitter with the cover removed.
The follower moves in unison with an orifice plate inside of the unit’s
pressure vessel via a magnetic coupling in order to indicate flow rate.
As the follower moves with changes in flow rate, the flow rate is
determined by relating the position of the flow indicator line to the
increments on the flow rate scale.

(3)

Illustration 1

PROGRAMMABLE JUMPER

NEMA 4X ENCLOSURE

SENSOR ASSEMBLY

FOLLOWER

FLOW INDICATOR LINE

FLOW RATE SCALE

DIN CONNECTOR

4-20 mA OFFSET ADJUST

4-20 mA SPAN ADJUST

0-5 VDC SPAN ADJUST

SIGNAL CONDITIONING CIRCUIT

The sensor array located in the sensor assembly sends a signal
relative to the position of the follower to the signal conditioning circuit.
The signal conditioning circuit converts the signal from the sensor
array into three different signals that are all directly proportional to the
reading that is determined by relating the position of the flow indicator
line to the flow rate scale.

The user may choose between reading a 0-2000 Hz square wave
pulse, a 0-5 VDC analog signal, or a two-wire 4-20 mA analog signal
by connecting to the appropriate pins on the 4-pin Hirschmann® din
connector and by placing the programmable jumper in the appropriate
position for the desired output.

An analog 1-5 VDC output may also be obtained by configuring the unit
for the two-wire 4-20 mA output and then placing a 249W ohm resistor
in the current loop. The exact output pins and jumper positions that
correspond to each output are discussed later in this manual.

4-20 mA Output Connections

Input Voltage:

The supply voltage must be between 12 and 35 VDC.The maximum
resistance that may be placed within the current loop is given by the
following formula:

Where: R

max

= the maximum resistance that may be placed in the

current loop (

Ω)

Vs= the value of the supply voltage (VDC)

(4)

R

max

= 50(Vs- 12)

4-20 mA Output Connections

Wiring Instructions (Refer to Illustrations 2 and 3 above):

1) Move the programmable jumper on the signal conditioning
board into the position closest to the meter’s outlet, as shown
in Illustration 3.

2) Connect the positive DC power source (+12 to +35 VDC) to
terminal #1 on the din connector

3) Connect terminal #2 of the din connecter to the positive current
input on the receiving device.

4) If the power source does not originate from the receiving device,
the negative side of the power supply must be connected to the
signal ground of the receiving device.

5) If the transmitter is operating properly, the green LED on the
signal conditioning board will illuminate dimly at zero flow and
will increase in intensity as flow increases.

(5)

Illustration 2 Illustration 3

PROGRAMMABLE JUMPER
IN POSITION CLOSEST
TO METER OUTLET

JUMPER POSITION - 4-20 mA

ELECTRICAL CONNECTION - 4-20 mA

NO CONNECTION

PIN #1

+12 - 35 VDC

PIN #2
4 - 20 mmA OUT

NO CONNECTION