Omega FLMH, FLMW, FLMG User guide

Product Manual

For Omega Flow Meters,

Alarms and Transmitters

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.

FLOW METERS

FLMX-XXXXX In-Line Flow Meters

Specification and General Information . . . . . . . . . . . . . . . . . . . . . .4-5

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-7

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-10

Pneumatic Meters Uses and Operation . . . . . . . . . . . . . . . . . . .10-13

Troubleshooting and General Maintenance . . . . . . . . . . . . . . . .14-18

Filtration and Contamination . . . . . . . . . . . . . . . . . . . . . . . . . . .19-20

Interchangeable Flow Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Basic Application Information

The flow meter can be installed directly in the fluid line without flow
straighteners or special piping. The meter is used to measure the flow
rate of most liquids which do not contain particles greater than 74 micron.

1) External components are sealed inside the Lexan window tube to
permit use in areas where the meter may be sprayed or washed
with soap and water.

2) Mount the meter in the most convenient location to allow easy
access for reading and maintenance.

3) The meter should NOT be mounted near hot pipes or equipment
which can cause deformation of the window tube and scale.

4) The meter should be mounted at least one foot (.3 meter) from
large electric motors, or the internal magnet may weaken or
become demagnetized.

5) Aluminum and brass meters should not be mounted where
assembled piping is not supported.

Page 4 / Flow Meters

Specifications

Casing Material Aluminum, Brass or Stainless Steel #304
Maximum Pressure

Aluminum and Brass: 3500 psi (240 Bar)

Stainless Steel #304: 6000 psi (413 Bar)
Maximum Temperature 240ºF (115ºC)
Reading Direct Reading - 360º Ref. Line (Non-Electrical)
Scale Accuracy +/- 4% FS, Center 1/3 of scale +/- 2.5% FS
Repeatability +/- 1% FS
Port Sizes 1/8" - 2" NPTF, #6 - #32 SAE (No Brass) 1/4" - 2" BSP

Installation Dimensions

(Port Sizes/Dimensions)

1/4", 3/8", 1/2" 1-7/8" O.D. x 6-9/16" Length

(48mm O.D. x 167mm Length)

3/4", 1" 2-3/8" O.D. x 7-5/32" Length

(60mm O.D. x 182mm Length)

1-1/4", 1-1/2" 3-1/2" O.D. x 10-1/8" Length

(90mm O.D. x 258mm Length)

Installation Orientation Horizontal or Vertical (Scaled Vertically)
Flow Straighteners Not Required
Test Fluid Mobile DTE 25 Medium @ 110ºF (43ºC)

Warning and Precautionary Ar eas

1) The meters are designed to operate in systems that flow in only one
direction: the direction of the arrow on the flow scale. Attempting operation
in the reverse direction may cause damage to the meter or other system
components.

2) The window tube of standard meters is made of Lexan. Lexan can be
safely cleaned with soap and water. However, many other cleaning agents
can damage Lexan, causing discoloration or crazing. If you are unsure of
your cleaning agent, call the General Electric Lexan Compatibility
Reference Line at 800-845-0600.

3) To retain accuracy and repeatability many internal moving parts are
precision machined and require filtration of at least 74 micron or a
200 mesh screen.

4) All meters are tested and calibrated at our test facility using a light
hydraulic oil. The units are well drained, but some oil residue may still remain
within the meters. Please check the compatibility with your fluid. The meter
may have to be cleaned before use. (See “Cleaning & Inspection”)

5) When installing aluminum or brass meters onto steel pipe caution should
be taken not to over tighten the pipe connections. The thread in the meter
end fittings may strip if over tightened.

6) Aluminum and brass meters should not be used in systems where the
assembled piping is not supported. Heavy weight may cause the meter
to bend or malfunction.

7) Operating Temperature: In standard meters, several components have a
maximum temperature rating of 240ºF (115ºC).

8) Operating Pressure: All meters are tested at a burst pressure three times
of operating pressure. Meters should not be used over the operating
pressure rating.

9) Pressure and flow surges may disengage the outer magnet follower from
the transfer magnet. If this occurs, a shock suppressor should be used to
eliminate malfunction.

10)Teflon tape: Caution should be used when using Teflon tape on pipe
thread joints. Leave at least 1/8" (3mm) of pipe thread exposed from end
of pipe when applying tape.

11)These meters, as well as many other meters, use an internal transfer
magnet in the design. Because of this magnet, be aware of the following:

a) Keep flow meters away from computer disks and tapes.
b) If metal particles are moving through the system, a magnetic

filter may be required.

Page 5 / Flow Meters

INSTALLATION

Basic Installation Instructions

The meters are mounted in-line and are direct reading. The meters
can be mounted in a vertical or horizontal position as long as the fluid
is flowing in the direction of the arrow on the flow scale. No straight
pipe is required before or after the meter. In fact, 90° elbows can be
installed on both ends without any noticeable flow variation.

When installing a meter, apply “Teflon Tape” or “Liquid Teflon Sealant”
on pipe threads. If tape is used, be sure to leave 1/8" (3 mm) of pipe
thread exposed on end of pipe. Position filter in front of meter and in
a location that allows easy access for routine maintenance. Refer to
“Warnings and Precautionary Areas” for additional information.

INSTALLATION DOS AND DON'T

To obtain satisfactory operation from a flow meter, the following points
should be considered:

DO:

 install a pressure gauge near the inlet of the meter
 place throttling valves at the outlet of the meter
 use pipe sealer on the connections
 install a union on one side of the meter for easy removal for

maintenance and calibration

 install solenoid valves at meter outlet (as far downstream as possible)
 mount in any orientation: vertical, horizontal or upside down

DO NOT:

 place restrictions between the meter’s pressure gauge meter inlet
 use in systems where reverse flow is possible
 place meter in non-aligned piping
 over-flow the meter by more than 150% of maximum reading
 operate at pressures and temperatures greater than specified



*

install restrictions between pressure gauges and the meter inlet



*

install solenoid valves at the meter inlet

*

pneumatic flow meter applications

Page 6 / Flow Meters

Fluid Flow in Rever se Dir ection

The standard monitor will not permit flow in the reverse direction
(opposite direction to the arrow printed on the flow rate scale). In the
reverse direction, the meter will behave in a manner similar to a leaky
check valve.

Prolonged flow in the reverse direction will cause damage to the
standard monitor's internal mechanism that could result in inaccurate
readings or premature failure of the meter. If the standard meter will
be installed in a system where reverse flow is possible, it is recom­mended that a check valve be installed in parallel with the meter in
order to facilitate reverse flow around the meter. Check valves are
readily available through fluid component distributors.

Bi-Directional Flow Measurement

In certain situations it may be necessary to measure flow rates in both
directions. For a small additional fee, an option for bi-directional flow
measurement may be specified. Meters that include this option are
designated by a "-BI" suffix attached to the end of the model code.

If the part number label on the meter that is being installed shows a
model code containing the "-BI" suffix, then the meter may be
installed in any orientation regardless of flow direction.

Page 7 / Flow Meters

OPERATION

Operating Principles

Omega has developed a line of unique flow meters which combine
the simplicity of a sharp-edged orifice disk and a variable area flow
meter. See Illustration 1 “Flow Meter Cross Section” on page 9.

The meters are tubular, with all internal wetted parts sealed within
the body casing. Running through the center of the body casing is
a tapered center shaft which is centered in the bore by pilot disks at
each end. Encircling the shaft is a sharp-edged, floating orifice disk,
transfer magnet and return spring. The disk and transfer magnet are
held in the “no flow” position by the biased return spring.

As the flow moves through the meter it creates a pressure differential
across the floating orifice disk, forcing the disk and transfer magnet
against the return spring. As flow increases, the pressure differential
across the disk increases, forcing the disk and transfer magnet to
move along the tapered center shaft. As flow decreases, the biased
return spring forces the disk and transfer magnet down the tapered
center shaft, returning to the “no flow” position.

In metal casing meters we cannot see the movement of the floating
orifice disk and transfer magnet because they are sealed inside the
body casing. Therefore, a magnet follower is positioned around the
outside of the body casing and is magnetically coupled to the internal
transfer magnet. As the flow rate increases, the internal magnet
moves along the tapered center shaft (inside the body casing) and
the magnet follower moves along the outside of the body casing
(under the scale).

Page 8 / Flow Meters

1. End Porting 8. Flowing Sharp-Edged Orifice Disk

2. Body Casing 9. Tapered Center Shaft

3. Magnet Follower 10. Transfer Magnet

4. Window Tube 11. Scale

5. Window Seal 12. Return Spring

6. Seal Assembly 13. Retainer Ring

7. Pilot Disk

* Cartridge contains: 7, 8, 9, 10, 12 & 13

Reading the Meter

Notice the black reference line which runs 360° around the white
magnetic follower. This reference line moves under the scale in direct
relation to the movement of the internal orifice disk. When fluid is
flowing, the flow rate through the meter is read by lining up the black
reference line with the closest rate line on the external flow scale.

Specific Gravity or Density Effect

Standard meters are calibrated for either WATER with a specific
gravity of 1.0 or OIL with a specific gravity of .873. The floating disk
meter is effected by fluid density as are most other similar types of
meters. Omega meters have less of this effect because of the sharp­ness of the floating orifice disks being used.

Page 9 / Flow Meters

12

11

10

8

7

9

13

6

5

4

3

2

1

Flow

Direction

Flow

Direction

FLOW METER

(CROSS SECTION)

Illustration 1

The indicated flow reading will read high for heavier fluids and low for
lighter fluids. Acorrective factor can be applied to the standard scale
or a special scale can be added at a slight additional cost. When
flowing other specific gravities, the basic equations below can be used.

For WATER Meters use: 1.0/Specific Gravity x scale reading

For OIL Meters use: .873/Specific Gravity x scale reading

Viscosity Effect

The meters incorporate a unique floating, sharp-edged orifice disk.
The floating, sharp-edged orifice disk offers greater operating stability
and accuracy over a wide range of viscosities.

PNEUMATIC METER USES & OPERATING THEORY

Rugged, high pressure, pneumatic meters are designed for
permanent installation in compressed gas systems. These products
provide a low cost means to measure compressor volumetric outputs,
pneumatic tool consumptions and other industrial gas flow rates.

The meters operate using the variable annular orifice method with
compression spring return –the identical method used in our field
proven liquid flow rate meters. The product’s follower, where the
measurement is indicated, is magnetically coupled through a high
pressure casing to the meter’s internal orifice assembly.

Benefits of these design features are:

 high operating pressure
 linear displacement of the follower with respect to flow rate
 high turn-down ratios
 measuring accuracy within ±4% of full-scale
 operation in any mounting orientation

Meters are offered in three standard materials of construction:

 aluminum for standard monitoring applications to 600 PSIG
 brass for media/material compatibility
 stainless steel for compatibility and operation to 1000 PSIG.

Page 10 / Flow Meters

Measuring ranges cover 1.5-12 SCFM through 150-1300 SCFM.
Twenty-four port sizes from 1/8" through 2" in NPT, SAE and BSP
can be ordered to meet specific plumbing requirements. Pneumatic
meters are also available in alarm and transmitter configurations for
electronic monitoring applications.

Standard Cubic Feet

Meters are calibrated to measure the flow of
compressible media (gases) in SCFM – stan­dard cubic feet per minute. A“standard” cubic
foot is defined as a cubic foot of dry air
at standard atmospheric conditions: 70ºF and

14.7 PSIA (0 PSIG) measured at sea level.

When a standard cubic foot of air is com­pressed, its actual volume will decrease pro­portionally as absolute pressure increases.
For example, a standard cubic foot of air’s
actual volume will decrease by 50% and den­sity will increase by 100% as the air is com­pressed from atmospheric pressure 14.7 PSIA
(0 PSIG) to 29.4 PSIA (14.7 PSIG). See
Illustration 2.

There are three factors that affect the Flow
Meter Calibration: specific gravity, pressure
and temperature. Meters are calibrated for air
(specific gravity of 1.0) at 70ºF and 100 PSIG.
Most low pressure rotameters are calibrated
at 0 PSIG and require corrections for use at
any other pressure.

Omega meters are designed for pneumatic
systems where pressures between 90 -110
PSIG are used. In these common applica­tions, a monitor with a standard calibration
can be read directly without applying cor­rections.

Page 11 / Flow Meters

14.7 PSIA (0 PSIG)

29.4 PSIA (14.7 PSIG)

58.8 PSIA (44.1 PSIG)

Illustration 2

Illustrates the effect of
different pressures on

the volume of gas.

DENSITY CORRECTION FACTORS

SCFM (indicated) x (CF) = SCFM (Actual) CF= (F1) x (F2) X (F3)
Note: all correction factors need not be used.

Table 1. (f1) PRESSURE CORRECTION FACTORS (inlet pressure)

Table 2. (f2) TEMPERATURE CORRECTION FACTORS

Table 3. (f3) SPECIFIC GRAVITY CORRECTION FACTOR

f1= correction factor for other than 100 PSI inlet.
f2= correction factor for other than 70ºF.
f3= correction factor for other than air at 1.0 Sp. Gr.

Correction Factors

If a meter is installed in a system where conditions differ from the
standard listed above, correction factors will need to be applied to
retain the design accuracy of the meter. The appropriate correction
factor equations are detailed above. To assure the best monitoring
accuracy, pressure and temperature measurements should be taken
directly at the meter’s inlet port.

Special Scales

Special calibrations can be performed to correct for the following
system characteristics:

 system pressure
 system temperature
 media specific gravity
 various measuring units (i.e. LPM, LPS, m3/hr, etc.)
 any combination of the above

Consult the factory or your distributor for details and prices.

Page 12 / Flow Meters

f1= 14.7 + psig

114.7

f2= 530

460 + ºF

f3=1

Sp. Gr.

psig 25 50 75 100 125 150 175 200

f

1

.56 .75 .88 1.0 1.11 1.2 1.29 1.37

ºF 10º 30º 50º 70º 90º 110º 130º 150º

f

2

1.08 1.04 1.02 1.0 .98 .96 .95 .93

Page 13 / Flow Meters

Selecting the Proper Monitor

To order a pneumatic flow meter the following information is required:

 pipe size and port style
 media (air, nitrogen, argon,etc.) – for material compatibility and

specific gravity considerations

 approximate flow range required

1

 system pressure: nominal, maximum, minimum
 system temperature

Flow Range

1

Estimating the flow rate in a compressed gas system may seem
complicated, but with some research and a few simple equations
an educated guess can be made.

Two suggested methods are:

Method 1

A compressor is typically rated in SCFM output at a certain pressure
and efficiency. If the rating cannot be located or is unknown, an esti­mate of compressor output can be obtained by the following formulas:

 1-stage compressors:

motor HP/0.179 = SCFM @ 100 PSIG

 2-stage compressors:

motor HP/0.164 = SCFM @ 100 PSIG

 3-stage compressors:

motor HP/0.159 = SCFM @ 100 PSIG

Method 2

If all of the potential of a compressor is not being used (the unit
cycles on and off) or if flow rate in excess of compressor capacity is
being consumed (the compressor cannot meet the demand), a sum­mation of machine usages can be totaled to determine the maximum
flow rate. Most machine tools that use compressed air specify the
maximum consumption of the tool.

TROUBLESHOOTING & MAINTENANCE

Page 14 / Flow Meters

TROUBLESHOOTING CHART

Malfunction: Magnet follower sticks in mid-scale and will not

return to the “no flow” position.

Possible Cause:

Horizontal/Vertical Mount

Particulate, Teflon tape, rust or other
foreign matter is holding the internal
parts form returning.

Horizontal/Vertical Mount

A surge or shock in the fluid flow
moved the internal magnet faster that
the external follower could follow, thus
separating the follower from the magnet.

Corrective Action:

Disassemble and inspect meter for
contamination. Install proper filtration
or problem may reoccur.

Warning: Shut down systems before removing meter from flow line. Remove meter from

system. Tip the meter so the arrow on the flow scale points upward. This should
return the magnet follower to the “no flow” position. Add some type of surge
protection, or problem my reoccur.

Malfunction: Meter scale reading is off an equal amount

at all points and the magnet follower still
moves freely.

Possible Cause:

Reading the scale using the top or
bottom edge of the magnet follower.

Corrective Action:

Be sure to read the scale using the
black reference line which runs around
the magnet follower.

Possible Cause:

Fluid being monitored may not be
compatible with standard meter scale.

Corrective Action:

Standard meters are calibrated for
.873 SP. Gr. oil at 110° (43°C) using
Mobile DTE 25 Medium fluid. Check
your fluid data for a variance, or call
the factory for assistance.

Possible Cause:

All meters are calibrated in the vertical
position.

Corrective Action:

Check with the factory for a correction
factor or for a replacement scale cor­rected for horizontal use.

Page 15 / Flow Meters

TROUBLESHOOTING CHART (CONTINUED)

Malfunction: Window tube is cracking or crazing.

Possible Cause:

Using incompatible cleaning solution
on Lexan window tube.

Corrective Action:

Use soap & water or a mild degreaser
(Stoddard or Naptha) to clean Lexan
tube. To check the compatibility of
your cleaning fluid, call General
Electric’s Lexan Compatibility
Reference line at 800-845-0600.

Malfunction: Scale is fogging or coming loose.

Possible Cause:

Ambient or fluid temperature is too
high.

Corrective Action:

Relocate meter in another area where
temperature specifications are not being
exceeded.

Possible Cause:

Using incompatible cleaning solvents
on scale.

Corrective Action:

Use soap and water.

Disassembly

Important: It is not necessary to remove window tube or window

seals to clean the meter. Note also how the meter
disassembles for easy of reassembly.

Warning: Shut down system before removing meter from flow line.

1. Use a clean dry cloth
to remove all foreign
material from exterior
of meter, especially
around threaded ends.

2. Remove meter from the
flow line.

3. With the arrow on the
scale pointing upward,
mount the meter in a
vice. See Illustration 3.
Use the flats of the inlet
end porting when securing the meter in the vice.

Important: DO NOT wrench or tighten vice on Lexan tube.

4. Install a wrench across the flats of the outlet end porting and turn
counterclockwise to loosen assembly. Do not remove end porting
at this time.

5. Remove meter from vice. Hold the meter so the end port that is
loose, is on top. Remove loose end porting.

6. Tilt the open end of meter
over a clean cloth to
expose inner cartridge.
See Illustration 4.
Remove inner cartridge
assembly from body
casing. Note: Because
the transfer magnet is
magnetically coupled to
the magnetic follower,
you will notice a slight
resistance when removing
cartridge. If cartridge does
not slide out, insert a wooden dowel in opposite end of meter and
push or lightly tap on dowel until cartridge comes loose.

Page 16 / Flow Meters

Illustration 3

Illustration 4

IMPORT ANT: If inner cartridge does not slide out freely, it may be

sign of contamination. The transfer magnet is a powerful ALNICO
magnet. Keep it away from metal chips and fillings. They may be
hard to remove when reassembling and will cause premature failure.

7. Examine inner cartridge or level
of contamination.

A. If inner cartridge has a low

level of contamination and is
functioning properly, no further
disassembly is required.
Proceed to “Cleaning and
Inspection.” See Illustration 5.

B. If inner cartridge appears

to be highly contaminated
or damaged, it should be
completely disassembled
for cleaning and inspection.
Proceed with Step 8.

8. Remove outlet side
(spring end) retainer clip,
See Illustration 6, which
secured pilot disk to tapered
center shaft.

9. Remove return spring,
transfer magnet and
floating orifice disk.
See Illustration 7.

10. Proceed to “Cleaning

and Inspection.” After
the meter is cleaned
reassemble parts in
reverse order of
disassembly.

IMPORTANT:
Always use new retainer clips for reassembly. 3/8" and 1/2" = Waldes
No. 5105-12H. 3/4 and 1" and 1-1/4" and 1-1/2" = Waldes No. 5105­18H, or obtain at no charge from the factory.

Page 17 / Flow Meters

Illustration 5

Illustration 6

Illustration 7

Cleaning and Inspection

Note: If the inner cartridge is damaged or contaminated beyond repair, the complete

meter can be sent to the manufacturer for evaluation. The manufacturer will
inspect, repair, and/or replace parts as needed according to the warranty.

1. Inspect inner cartridge and body casing for contamination.
If the inner cartridge did not slide out freely, it may be a sign of
contamination. Locate and eliminate the source of contamination
before reconnecting meter to the system or the same problem
will reoccur. It may be necessary to install finer filtration or a
magnetic filter in the system.

2. Soak inner cartridge assembly (or individual parts, depending on
level of disassembly) in a suitable cleaning solvent. Naptha or
Stoddard is recommended.

CAUTION: When using an air hose wear proper eye protection.

3. Remove parts from solvent. Use an air hose and/or scrub with a
light brush to remove any remaining contaminants. Remove any
magnetized particles from transfer magnet.

4. Inspect inner cartridge for scored or worn parts. Replace parts as
needed. (Parts are available from your local distributor.)

5. Remove any contaminants from inside body casing.

6. Clean Lexan widow tube with soap and water, or a compatible
cleaning solvent. IMPORTANT: Some solvents may cause
damage to Lexan tube, check compatibility of solvent being used.

7. Clean and inspect seal assemblies (O-rings and seals) for nicks
or cuts. Replace as needed.

8. Clean and inspect the meter every six months.

Properly filtered meters will provide years of trouble-free service. If
the meter is not properly filtered, it may be damaged and malfunction.
Meter damage caused by excessive contamination in not covered
under warranty.

Page 18 / Flow Meters

CONTAMINATION AND FILTRATION

Recommended Filtration

The manufacturer recommends system filtration of at least 74 micron
filter or a 200 mesh screen. It has been found that if inadequate filtration
has caused meter failure, it will normally fail in the open position. Some
systems may require a magnetic filter. IMPORTANT: Meter damage
caused by excessive contamination is not covered under warranty.

Stabilized Contamination

The goal of filtration is to create effective protection from system
contamination. Proper filtration stabilizes contamination to allow
fluid components to function properly. A fluid system is considered
stabilized when, “contamination in” equals “contamination out”.
Proper filtration must reduce initial contamination to a stabilized level
within an acceptable time period. the system should be stabilized in
time to prevent premature wear or damage to meter components.

Contamination Sources

Fresh Fluid

When fresh fluid is stored in holding tanks, it may be contaminated
with scale or metal flakes from inside the tank. To prevent this type of
contamination, be sure to filter fresh fluid before adding to the system.

New Machinery Contamination

When building new machines, a certain amount of built-in contamination
is unavoidable. Typical built-in contamination consists of dust, dirt,
chips, fibre, sand, flushing solutions, moisture, weld splatters and
pipe sealants. Flushing the system before operation can reduce
contamination, but cannot eliminate it totally. Unless the system is
flushed at a high velocity, some contamination will not be dislodged
until the system is in operation. System contamination can cause fluid
component malfunction.

Environmental Contamination

When performing routine maintenance, the system’s fluid is commonly
exposed to environmental contamination. Exercise caution during
routine maintenance to prevent this type of contamination. Be sure to
change breather filter and systems air filter regularly.

Page 19 / Flow Meters

Self-Generation Contamination

Self-generated contamination is a product of wear, cavitation,
fluid breakdown and corrosion. Systems that are carefully flushed,
maintained, and have fresh fluid added, mainly have self-generated
contamination. In this case, proper filtration can prevent fluid
component malfunction.

INTERCHANGEABLE FLOW CARTRIDGE

Basic Application Information

This unique design permits the exchange of many different cartridges
within the same meter, thus, allowing the conversion to other flow
ranges at minimal cost. The substitute cartridge offers different flow
ranges at the same low pressure drop as the original. Each cartridge
comes with a new cartridge, scale and installation instructions. Check
with your meter distributor for prices and delivery.

Page 20 / Flow Meters

FLOW ALARMS

FLMG, FLMH and FLMW Series
with -R1 or -R2 Option

General Information and Overview . . . . . . . . . . . . . . . . . . . . . . . . .22

Switches/Switch Specifications . . . . . . . . . . . . . . . . . . . . . . . . .23-24

Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24-25

Standard Control Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26-27

NOTE: Installation, operation and cleaning instructions for the basic flow meter
cartridge can be found in the first section of this manual. The following instruc­tions are specifically for meters with electrical switches for flow alarms.

General Information

Omega’s Flow Alarms are typically used to make or break a set of elec­trical contacts to signal a limit setting. They may be used to turn on a
warning light, sound a bell or horn, or even to shut down a process. The
switches on the alarm can be configured to open or close a contact for
an increasing or decreasing set point. Decreasing flow set points may
be located anywhere in the lower 2/3 of the scale while increasing set
points may be located anywhere in the upper 2/3 of the scale.

Overview

Illustration 1 shows the primary mechanism for a single-switch flow
alarm. Dual-switch flow alarms contain two sets of these same com­ponents, but have a slightly different electrical wiring diagram (Wiring
to the DIN connector is described on page 24.) The factory default
configuration for the alarm switch is for decreasing flow, as shown
in Illustration 1. Dual alarm units contain one additional switch
configured for increasing flow. If an increasing flow alarm is desired,
it should be specified when the unit is ordered.

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 indica-
tor line to the increments
on the flow rate scale.

Page 22 / Flow Alarms

Illustration 1

FOLLOWER

POINTER

SWITCH GLIDE

SCREW

ALARM

SWITCH

FLOW INDICATOR

LINE

FLOW RATE
SCALE

The pointer indicates the set point for the alarm switch. In Illustration
1, the switch will be actuated at all flow rates below 4 GPM. To

change the set point, simply loosen the switch glide screw one (1)
turn and slide the switch to the desired position along the flow rate
scale. When the pointer is pointing to the desired flow rate, re-tighten
the switch glide screw.

Switches

The switch is a simulated roller, lever operated low force microswitch.
The specifications for this switch are listed on page 4. The switch is
actuated when movement of the follower causes the switch lever to
be lifted. In Illustration 2, the switch has not yet been actuated, and
the electrical circuit is through the normally closed (NC) contact.
Illustration 3 shows the switch after it has been actuated. In this sce­nario, the electrical circuit is through the normally open (NO) contact.

Precautions

 Be certain to properly ground the unit via the ground (G) pin

located on the unit’s din connector.

 In order to avoid accidentally removing the switch glide screw,

never loosen it by more than one or two turns. This screw can be
difficult to replace if accidentally removed.

 Avoid over tightening the switch glide screw.
 When the switch adjustments are complete, make certain that the

wires that are attached to the switch have not been moved into a
location that will interfere with the follower or the switch lever.

 Do not make any modifications to the unit’s internal wiring.

Page 23 / Flow Alarms

TRIGGER

COMMON

SWITCH LEVER

FOLLOWER

METER CASING

NO

NC

Illustration 2 Illustration 3

TRIGGER

COMMON

SWITCH LEVER

FOLLOWER

METER CASING

NO

NC

Switches Specifications

Type Form C, dry contact
UL/CSA Rating 10 & 1/4 hp, 125 or 250 VAC

1/2 A, 125 VDC & 1/4A, 250 VDC

3A, 125 VAC “L” lamp load
Mechanical Life >10,000,000 cycles
Actuating Mechanical Simulated roller, lever operated,

low force
Connectors 3/16" tab
Double Break Switch (Special) Form Z - 10A &1/2hp,

125/250 VAC

Electrical Connections

Standard Flow Alarms
are pre-wired with 4­pin Hirschmann-type
DIN connectors which
consist of a male
section as shown in
Illustration 4 and the
female section shown
in Illustration 5. To open the female section, first remove the screw,
then lift the connector portion out of the casing by inserting the head
of a screwdriver into the slot marked for that purpose. Illustration 6
shows the disassembled female section.

Page 24 / Flow Alarms

Illustration 4

Illustration 6

Illustration 5

Illustration 7 shows the connections for a standard, single switch

Flow Alarm as they are shipped from the factory. The wiring for other
types of connections are outlined in the tables below. For additional
details, please consult the factory.

Alternates to the standard
Hirschmann-type DIN
connector are available on
a custom basis. The Flow
Alarm may be outfitted
with a variety of different
electrical connections
including conduit fittings,
cable-type connectors and
cord grip/pigtail interfaces.
Almost any commercially
available electrical
connector may be used.
If an alternate connector
is desired, please consult
Omega.

Wiring Code: Standard Single Switch

White - Common Terminal #1of DIN
Black - N.C. Contact Terminal #2 of DIN
Red - N.O Contact Terminal #3 of DIN
Green - Enclosure Ground Terminal “G” of DIN

Wiring Code: Dual Switch Alarm

White - Both Common Terminal #1of DIN
Black - Decreasing N.O. Contact Terminal #2 of DIN
Red - Increasing N.O. Contact Terminal #3 of DIN
Green - Enclosure Ground Terminal “G” of DIN

Page 25 / Flow Alarms

Illustration 7

GREEN

NO
NC

BLACK

WHITE

COMMON

RED

TO ENCLOSURE
GROUND

Standard Control Cir cuits

Page 26 / Flow Alarms

Standard Control Cir cuits

Page 27 / Flow Alarms

* The load must be within the flow alarm’s and the slave

relay’s contact rating. Please see specifications.

NOTES:

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Page 28 / Flow Alarms

FLOW

TRANSMITTERS

FLMG, FLMH, and FLMW Series
with the -MA Option

General Information and Overview . . . . . . . . . . . . . . . . . . . . . .30-31

Output Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31-35

Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

User Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

NOTE: Installation, operation and cleaning instructions for the basic flow meter
cartridge can be found in the first section of this manual. The following instruc­tions are specifically for meters equipped with signal conditioning circuitry for
transmitting a proportional output signal.

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 connecting a 249 Ω resistor to 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.

Page 30 / Flow Transmitters

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 connecting a 249W ohm
resistor to 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)

Page 31 / Flow Transmitters

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.

Page 32 / Flow Transmitters

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

0-5 VDC Output Connections

Wiring Instructions (Refer to Illustrations 4 and 5 above):

1) Move the programmable jumper on the circuit board into the

position closest to the meter’s inlet, as shown in Illustration 5.

2) Connect the positive voltage source (+12 to +35 VDC) to terminal

#1 of the din connector.

3) Connect terminal #2 of the din connector to the negative side of

the DC voltage source.

4) Connect terminal #3 of the din connector to the 0-5 VDC input of

the receiving device.

5) If the power source does not originate at the receiving device, a

wire will need to be connected between the negative side of the
voltage source and the signal ground of the receiving device.

6) If the transmitter is operating correctly, the green LED on the

circuit board will illuminate brightly when power is applied to the
unit.

NOTE: The input impedance (resistance) of the receiving device

must not be lower than 100W or non-linearities may result.
Lower impedance will not damage the transmitter.

Page 33 / Flow Transmitters

Illustration 4

Illustration 5

PROGRAMMABLE JUMPER
IN POSITION CLOSEST
TO METER INLET

JUMPER POSITION - 4-20 mA

PIN #3

0 - 5 VDC OUTPUT

ELECTRICAL CONNECTIONS - 0 - 5VDC

NO CONNECTION

PIN #1

+12 - 35 VDC

PIN #2
DC GROUND

0-2000 Hz Pulse Output Connections

Wiring Instructions (Refer to Illustrations 6 and 7 above):

1) Move the programmable jumper on the circuit board into the

position closest to the meter’s inlet, as shown in Illustration 7.

2) Connect the positive voltage source (+12 to +35 VDC) to terminal

#1 of the din connector.

3) Connect terminal #2 of the din connector to the negative side

of the DC voltage source.

4) Connect the “G” terminal of the din connector to the pulse input

of the receiving device.

5) If the power source does not originate at the receiving device, a

wire will need to be connected between the negative side of the
voltage source and the signal ground of the receiving device.

6) If the transmitter is operating properly, the green LED on the circuit

board will illuminate brightly when power is applied to the unit.

Page 34 / Flow Transmitters

Illustration 6 Illustration 7

PROGRAMMABLE JUMPER
IN POSITION CLOSEST
TO METER INLET

JUMPER POSITION - 0-2000Hz PULSE OUTPUT

NO CONNECTION

ELECTRICAL CONNECTIONS - 0-2000Hz OUTPUT

“G” PIN

0-2000Hz OUTPUT

PIN #1

+12 - 35 VDC

PIN #2
DC GROUND

1-5 VDC Output Connections

Wiring Instructions (Refer to Illustrations 8 and 9 above):

1) Move the programmable jumper on the signal conditioning board

into the position closest to the meter’s outlet, as shown in
Illustration 9.

2) Connect the positive voltage (+17 to +35 VDC) to terminal #1 of

the din connector.

3) Connect terminal #2 of the DIN to the 1-5 VDC input of the

receiving device.

4) If the power source does not originate at the receiving device, a

wire will need to be connected between the negative side of the
voltage source and the signal ground of the receiving device.

5) If the transmitter is operating properly, the green LED on the

circuit board will illuminate dimly at zero flow and will increase in
intensity as flow rate increases.

Page 35 / Flow Transmitters

Illustration 8 Illustration 9

NO CONNECTION

ELECTRICAL CONNECTIONS - 1- 5 VDC

NO CONNECTION

249 OHMS

PIN #1

+17 - 35 VDC

PIN #2
1-5 VDC OUT

TO SIGNAL
GROUND

PROGRAMMABLE JUMPER
IN POSITION CLOSEST
TO METER OUTLET

JUMPER POSITION - 1- 5 VDC

Connectors

Standard flow sensors are prewired with 4-wire Hirschmann-type DIN
connectors which consist of a male section as shown in Illustration 10
and a female section as shown in Illustration 11. In order to make the
user connections, the screw terminals located inside of the female
section must be accessed.

To open the female
section, first
remove the screw
and then lift the
connector portion
out of the casing by
inserting the head
of a screwdriver
into the slot marked
for that purpose.

Illustration 12

shows the disas­sembled female
section. The screw
terminal connec­tions can be seen
on the piece located
at the far right side
of the illustration.

Alternate connectors are available on a custom basis. Nearly any
type of commercially available electrical connector may be installed
on an Omega Flow Transmitter. If an alternate connector is required,
please consult the Omega factory.

Page 36 / Flow Transmitters

Illustration 10 Illustration 11

Illustration 12

User Adjustments

The 4-20 mA, 0-5V, and 0-2000 Hz square wave outputs on the
Omega Flow Transmitter are all factory calibrated. User adjustment
should be unnecessary and any adjustment of the potentiometer on
the signal conditioning board is strongly discouraged. If one of the
outputs does fall out of calibration, the following procedure may be
used to recalibrate the unit.

1) Turn off the flow through the system.

2) Connect between +12 and +35 VDC to pin 1 of the din connector.

Connect terminal 2 of the din connector to the negative terminal
of the DC supply.

3) Move the programmable jumper on the signal conditioning

board into the position closest to the sensor’s inlet, as shown in
Illustrations 5 and 7.

4) Connect the positive terminal of a voltmeter to pin 3 of the din

connector. Connect the negative terminal to pin 2 of the din
connector.

5) Gradually increase the flow through the system until the flow rate

indicated on the printed flow rate scale reaches full-scale (the
highest value printed on the scale).

6) Adjust the 0-5 VDC Span potentiometer until a reading of

5.00 VDC is obtained on the voltmeter.

7) Turn off the flow through the system and remove the voltmeter.

8) Move the programmable jumper on the signal conditioning board

into the position closest to the sensor’s outlet, as shown in
Illustrations 3 and 9.

9) Disconnect pin 1 of the din connector from the positive terminal of

the DC power supply.

10) Connect the positive terminal of an ammeter to the positive

terminal of the DC power supply. Connect the negative terminal
of the ammeter to pin 1 of the sensor’s din connector.

11) Adjust the 4-20 mA Offset potentiometer (See Illustration 1) until

a reading of 4.00 mA is obtained on the ammeter.

Page 37 / Flow Transmitters

12) Gradually increase the flow through the system until the flow rate

indicated on the printed flow rate scale reaches full-scale (the
highest value printed on the scale).

13) Adjust the 4-20 mA span potentiometer (See Illustration 1) until

a reading of 20.00 mA is obtained on the ammeter.

14) Gradually decrease the flow through the system until a value

equal to 50% of full-scale is obtained on the sensor’s flow rate
scale. Verify a reading of between 11.92 and 12.08 mA.

Page 38 / Flow Transmitters

Trouble Shooting

Symptom Solution

The green LED does not
illuminate when power is
applied.

1) Re-check the wiring diagram for the
communication protocol that is being
used and verify that the wiring is correct.

2) Verify that the DC supply that is being
used is capable of producing at least
12 VDC.

3) Make sure that the cable that is
soldered to the din connector inside
of the sensor enclosure is plugged
into the connector opposite to the
programmable jumper.

The readings obtained from the
electronic output do not agree
with the readings shown on the
printed flow rate scale.

1) Make sure that the programmable
jumper is in the correct position for
the communication protocol that is
being used.

The green LED illuminates, but
no readings are obtained from
the sensor’s electronic output.

1) Re-check the wiring diagram for the
communication protocol that is being
used and verify that the wiring is correct.

2) Make sure that the cable from the sensor
assembly is plugged into the connect on
the signal conditioning board located
near the sensor inlet.

When the flow rate in the
systems changes, the follower
and electronic output do not
respond.

1) Remove the flow sensor from the
hydraulic systems and inspect the
intervals to see if anything has caused
them to become jammed. Make sure
that the 200 mesh, 74 micron filtration
requirement of the flow sensor is being
observed.

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.

FOR NON-WARRANTY REPAIRS,

consult
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.

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 2005 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.

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