Omega Products FSW300 Installation Manual

User’s Guide

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It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI
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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.

Table of contents Page

1. Device description and intended use ............................................................................................................... 2

1.1. Functional principle .......................................................................................................................................... 2

1.2. Component overview........................................................................................................................................2

2. Safety instructions ............................................................................................................................................ 2

2.1. Qualified personnel .......................................................................................................................................... 3

2.2. Special safety instructions................................................................................................................................ 3

3. Material specifications of wetted components ................................................................................................. 4

4. Flow switch installation..................................................................................................................................... 4

4.1. Mechanical installation ..................................................................................................................................... 4

4.2. Electrical connection ........................................................................................................................................ 6

5. Adjusting the switching unit .............................................................................................................................. 7

5.1. Type of contact................................................................................................................................................. 7

5.2. Flow switch....................................................................................................................................................... 7

6. Maintenance and repairs.................................................................................................................................. 8

7. Shut-down and disposal................................................................................................................................... 8

8. Technical data .................................................................................................................................................. 9

8.1. Technical data flow switch version..................................................................................................................9

8.2. Maximum flow rate of the flow switch............................................................................................................... 9

1

Device description and intended use

1. Device description and intended use

Flow switches are designed for minimum or maximum monitoring of liquid flows. The operational safety of the
supplied equipment is only guaranteed if it is operated according to its intended use (flow monitoring of liquids).
The specified limit values (see the chapter entitled “Technical data“) should never be exceeded.

It is your responsibility to select a technology which is suitable for your specific application, to install it correctly, to
carry out tests and to maintain all the components.

Various device versions are manufactured. The respective type plate displays the version of each device.

1.1. Functional principle

The flow switch consists of a paddle system (1) which has a
permanent magnet (2) located at its upper end. A reed contact (3)
is positioned outside the flow above this magnet. A second,
magnet (4) with opposite polarity is used to create a reset force.

The paddle system is moved once it comes into contact with the
flow which is to be monitored. The magnet (2) changes its position
in relation to the reed contact (3). The contact opens/closes
depending on the contact type (see chapter 5).

As soon as the flow is interrupted, the paddle returns to its original
position and the reed contact opens/closes depending on the
contact type (see chapter 5).

1.2. Component overview

2. Safety instructions

Always read these operating instructions carefully prior to installing the new product. Always adhere to the
instructions contained herein, especially the safety instructions, otherwise there is a potential risk of personal
injury and damage to instruments and plants.

Even though we provides assistance through personal consultation or the respective literature, it is the
responsibility of the customers to determine the suitability of the product for the specific application.

The flow switches are state-of-the-art devices. This concerns switching point accuracy, functioning and safe
operation of the device.

However, professional and safety conscious conduct of the operator is required to ensure safe operation.

2

Safety instructions

2.1. Qualified personnel

• The personnel entrusted with installing, operating and maintaining the flow switches have to be suitably

qualified; the required knowledge can be gained via training courses or appropriate on-the-job instruction. The
personnel have to be familiar with the contents of these instructions, which have to be available to them at all
times.

• The electrical connection should only be carried out by a fully qualified electrician.

• All work has to be carried out in accordance with existing national regulations on accident prevention and

safety at work and with any internal regulations of the operator, even if they are not specified in these
instructions.

2.2. Special safety instructions

• The operational safety of the supplied equipment is only guaranteed if it is operated according to its intended

use. The specified limit values (see the chapter entitled “Technical data“) should never be exceeded.

• To avoid damages to the flow switch and the monitored system, only use flow switches for minimum or

maximum monitoring of the flow of liquids.

• Always follow and adhere to the flow switch installation instructions.

• Never operate the flow switch in systems which have a greater flow rate than the specified max. flow rate

(see the chapter entitled “Technical data”, details of the max. flow rate). Otherwise it will cause irreparable
damage to the flow switch.

• Prior to flow switch installation, ensure that all the materials of the flow switch are chemically and

mechanically-resistant to the medium which is to be monitored and to all external factors.

• Ensure that the medium is free from magnetic particles.

• Suitable measures should be taken to prevent the medium from freezing.

If the flow switch is to be used in ambient temperatures of < 39.2 °F, do not carry out any operation
beforehand with pure water, e.g. a test run. Residual water in the flow switch can result in frost damage.

• No greases, oils etc. should be used during the installation of the FSW 300 devices due to the material

resistance.

• Ensure that the max. specified operating pressure is not exceeded.

• Never remove a flow switch or its upper parts from a pipe system under pressure.

• If the medium which is to be monitored is very hot, the flow switches or their connection fittings will also

become very hot. In this case, neither touch the flow switch nor place any heat-sensitive objects in its vicinity.

• Protect the flow switch against external magnetic fields in the immediate vicinity, since these can impair

device functioning.

• The technical data of special versions (customised versions) can deviate from the details in these instructions.
Please observe the details on the type plate.

• Caution: Danger of death due to high voltages!

Always de-energize the system before connecting the connector cable.

• It is prohibited to remove or make type plates or any other information attached to the equipment

indecipherable, otherwise all warranties and the responsibility of the manufacturer no longer apply.

CAUTION: Ensure that the maximum electrical contact load specified on the type plate is never exceeded;

otherwise the reed contact integrated in the switching unit will be damaged.
The switching capacity is reduced with inductive loads. Details of the protective circuit can be requested from the
manufacturer.

If problems or questions arise, please contact:

3

Material specifications of wetted components

3. Material specifications of wetted components

Type FSW 301, 302, 303, 304 FSW 305, 306, 307

Upper part 2. 0401 PPO (NORYL)

Paddle
system

Round head rivet ---------- ---------­Bushings PPO (NORYL) PPO (NORYL)
Axle 1.4571 1.4571 / PPO
Pipe section *1 none or brass PVC
Screw-in insert *2 2.0401 1.4571
Seal NBR NBR
V seal EPDM EPDM / PPO
Magnet Hard ferrite Hard ferrite

*1) only for flow switch with pipe section

*2) only for flow switch for direct installation, screw connection

*3) Type FSW 301 (Trimmable paddle) has a stainless steel sleeve (1.4571)

PPO (NORYL) *3 PPO (NORYL) *3

4. Flow switch installation

4.1. Mechanical installation

4.1.1. General installation instructions

⇒ When choosing the installation site, ensure that the specified limit values (see “Technical data”) are not

exceeded.

⇒ Select suitable measures to prevent the medium from freezing.

If the flow switch is to be used in ambient temperatures of < 39.2 °F, do not carry out any operation
beforehand with pure water, e.g. a test run. Residual water in the flow switch can result in frost damage.

⇒ Firstly, clean the pipe system in which the flow switch is to be installed and remove any magnetic particles,

e.g. welding residue.

⇒ The straight in- and outlet pipe (in front of and behind the flow switch) has to be at least

5 x ID.

⇒ The nominal installation position of the flow switch is an “upright

standing position” in horizontal pipework.

⇒ The switches should only be installed in a vertical position, deviation

max. 45° (Fig. 1).

⇒ Please contact the manufacturer if other installation positions are

desired.

⇒ Please make sure that there are no external magnetic fields in the

immediate vicinity of the flow switch, since these can impair device
functioning (Fig. 2).

⇒ There is an arrow on the flow switch. Ensure that this arrow is

parallel with the pipe shaft and is facing in the direction of flow
during installation (Fig. 2).

⇒ The brass and stainless steel union nuts ¾“BSP have a tightening

torque of 18.439 ... 22.127 ft lb.

⇒ The plastic union nuts have a tightening torque of 5.163 ... 5.901 ft

lb.

Fig. 1

Fig. 2

4

Flow switch installation

4.1.2. Flow switch for direct installation

⇒ During flow switch installation, ensure that the paddle does not touch the wall of the pipe.
⇒ Carry out installation of your device type as described in the table below.

Flow switch type Installation type and instructions

FSW 301 Installation in sockets with a ½” NPT female thread

Caution: Please observe the installation height

dimensions

FSW 301 (Trimmable paddle)

Important:

In order to shorten the paddle to the

Nut size 32

¾” BSP

required length, use a side cutter.

When cutting, hold the paddle tight
above the cut surface.

Nut size
male thread

½” NPT, 14 mm

Welding nipple

with female thread

27,

½” NPT

Fig. 4

Installation in sockets with a ½” NPT female thread,

should only installed vertically in horizontal pipes.

Caution: Always observe the installation height

dimensions

4.1.3. Flow switch with pipe section

⇒ Install the flow switch pipe section just like a valve

in the existing pipe.

⇒ The pipe section has a NPT thread connection

female according to the nominal diameter. Make
sure that the correspondent part has the same
NPT thread connection male.

⇒ Counterhold! When tightening the correspondent

part use only the wrench flat of the flow switch.

Fig. 5

5

4.2. Electrical connection

4.2.1. General electrical connection information

⇒⇒ C

AUTION: Danger of death due to high voltages!

Always de-energize the system before conne

AUTION: Ensure that the maximum electrical contact load specified on the type plate is never exceeded;

⇒⇒ C

otherwise the reed contact integrated in the switching unit will be damaged.
The switching capacity is reduced with inductive loads. Details on the protective circuit can be requested from
the manufacturer.

4.2.2. Elbow plug connector EN 175301-803-A

⇒⇒ Loosen the central screw (po

s. 6) M3x35 and disconnect the junction box EN 175301-803-A

Fig. 6 Fig. 7 Fig. 8 Fig. 9

(pos. 2) from the conne

⇒⇒ Use a s

crewdriver or similar tool to press out the core (pos. 8) of the junction box (Fig. 7).

ctor (pos. 1) (Fig. 6). Pull the central screw out of the junction box.

⇒⇒ Loosen the screw connection M16x1.5 (pos. 5, Fig. 8).

⇒⇒ Feed the connecting cable into the junction box via the s

and the rubber insert (pos. 9) and subsequently conne
(see Fig. 9).

ss the core (pos. 8) until it locks into position in the junction box (pos. 2).

re

⇒⇒ P

⇒⇒ Tighten the cable gland M16x1.5 (pos. 5).

cting the wires of the mains cable.

crew connection (pos. 5), the clamping ring (pos. 10)

ct the wires as displayed in the connection diagram

Adjusting the switching unit

⇒⇒ Place the junction box (pos. 2) on the connector (pos. 1) and retighten the central screw (pos. 6).

⇒⇒ To guarantee the protection class IP 65 according to EN 60529, the applied connecting cable has to have a

sheathing diameter of between 0.177 and 0.393 inch.

⇒⇒ Furthermore, ensure that all the conne

Flow s

witch

Fig. 10

6

ctor seals (pos. 3, 4 and 9) have been correctly inserted.

Flow switch installation

4.3 Installation instructions for PVC pipe:

1. Note the flow direction arrow on the flow
switch and install with the arrow pointing in
the direction of flow.

2. Position the switch + glue-in adapter + gasket
securely into the pvc pipe tee without
using adhesive.

3. Inspect inside the pipe to ensure that the paddle
moves freely without contacting the walls of the pipe.

4. Mark the glue-in adapter so that you can re-install
it back into the ideal position after the adhesive
is applied.

5. Remove the switch & adapter, apply the adhesive
to the adapter & re-insert it to the position previously
marked.

6. After the glue is cured, assemble the gasket & switch.
Tighten the union nut to a max of 5.9 ft lbs
(aprox. hand tight).

5. Adjusting the switching unit

5.1. Type of contact

Standard contact:

The switching unit of the control switch enables two types of contact:

1. Normally open contac

2. Normally closed contact: “WHITE” or “BLUE” arrow on the switching unit

The following table explains the two types of contact:

Type of contact Setting Flow rate: Electric contact

Normally open contact RED ar

Normally closed contact WHITE or BLUE arrow

If not otherwise agreed with the customer, the switching unit is factory set as a normally open contact, i.e. the reed
contact opens if the set switching point is exceeded.

5.2. Flow switch

⇒⇒ In order to adjust the switching unit, open the cover of the switching head (Fig. 13)

t: “RED” arrow on the switching unit

row

increasing closing

decreasing o

increasing opening

d

ecreasing c

pening

losing

Fig.13

⇒⇒ Subsequently loosen the locking screw (2.5 hexagon socket screw for the brass and stainless steel version or

recessed h
visible at the entry of the switching contact guide for a desired make contact (Fig. 14) or break contact (Fig.

15) respectively.

7

ead screw for the plastic version) and position the switching unit until the red or white arrow are

Maintenance and repairs

⇒ The fine adjustment of the switching point can be carried out on the basis of the arrow length:

Movement towards the arrow head: Switching point is set to lower flow rate.
Movement towards the arrow tail: Switching point is set to higher flow rate.

⇒ Carefully retighten the locking screw.
⇒ We recommend you to use lacquer / threadlocker to secure the locking screw of the switching unit after

carrying out individual adjustments.

⇒ Close the cover until it locks into place.

Adjustment of the switching unit is not required if a desired ex works switching point setting has been agreed with
the customer.

Fig. 14 Fig. 15

6. Maintenance and repairs

The flow switch is maintenance-free and cannot be repaired by the user. In the unlikely event of a defect, the
device has to be returned to the manufacturer for repair work.

7. Shut-down and disposal

⇒ Never remove a flow switch or its upper part from a system under pressure.

⇒ Remove all the electrical connections and dismount the flow switch.
⇒ The flow switch consists of various materials (see “Chapter 3”). Never dispose of the flow switch in domestic

waste (refer to the crossed out waste bin displayed on the type plate).

⇒ Return the flow switch to the manufacturer for correct disposal.

8

Technical data

8. Technical data

⇒ The technical data of special versions (customised versions) can deviate from the details in these

instructions. Please observe the details on the type plate.

8.1. Technical data

Series FSW 301, 302, 303, 304 FSW 305, 306, 307

Nominal pressure 362.6 psi * 145 psi *

Max. medium temperature
(the medium should never freeze)

Ambient temperature
(do not store at <4 °F)

Max. switching current 1 A

Max. switching voltage 230 VAC, 48 VDC

Max. switching capacity 26 VA, 20 W

Protection class II

Degree of protection IP 65

Max. permanent temperature load of the
cable

Connecting cable length

Cable cross-shaped section

Tolerance of the switching point ranges

*Reduced pressure level for devices with copper pipe section. Please observe the details on the type plate!

230 °F 212 °F

176 °F,

212 °F (optional)

⎯

221 °F (optional)

⎯

⎯

±15 %

158 °F

158 °F

4.92 ft

AWG 21

8.2. Maximum flow rate of the flow switch

⇒ The max. permissible flow rate can deviate from the specified limit values for customised versions.
Flow switch with pipe section

The maximum specifications relate to water as the medium and a continuous flow rate.

Brass/Stainless steel pipe section

FSW 301, 302, 303, 304 FSW 305, 306, 307

Size / process connection Max. flow rate [GPM] Max. flow rate [GPM]

1

/4'' NPT 11.7 . / .

3

/8'' NPT 15.6 . / .

1

/2'' NPT 17.4 7.8

3

/4'' NPT 46.8 20.8

1'' NPT 50.7 33.8

11/4'' NPT 62.4 . / .

11/2'' NPT 104 . / .

2'' NPT 104 . / .

Flow switch for direct installation

Series FSW301
Thread

connection

(mounting length 4.37 inch)

1

/2'' NPT

Insert in size Max flow rate [GPM]

4'' 440

6'' 660

8'' 880

9

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 2007 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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