Omega Products OSWT36 Installation Manual

SW14

1

⁄4 DIN Series and OSW Series

Rotary Selector Switches

MADE IN

SW14 SERIES

1/4 DIN

96 x 96 mm (3.78")

OSW SERIES

76 x 76 mm (3.0")

127 x 127 mm (5.0")

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Servicing

North America:

U.S.A.:

ISO 9001 Certified

OMEGA Engineering, Inc.
One Omega Drive
P.O. Box 4047
Stamford, CT 06907-0047 USA
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Canada:

976 Bergar
Laval (Quebec)
Canada H7L 5A1
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: info@omega.c

For immediate technical or

application assistance:

U.S.A. and Canada:

Sales Service:

1-800-826-6342/1-800-TC-OMEGA

®

Customer Service:

1-800-622-2378/1-800-622-BEST

®

Engineering Service:

1-800-872-9436/1-800-USA-WHEN

®

Mexico:

En Español: 001 [phone]
FAX: [phone]
[e-mail]
e-mail: [e-mail]

OMEGAnet®On-Line Service Internet e-mail

omega.com [e-mail]

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.

Benelux:

Managed by the United Kingdom Office
Toll-Free: 0800 099 3344 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Czech Republic:

Frystatska 184
733 01 Karviná, Czech Republic
Toll-Free: 0800-1-66342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

France:

Managed by the United Kingdom Office
Toll-Free: 0800 466 342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Germany/Austria:

Daimlerstrasse 26
D-75392 Deckenpfronn, Germany
Toll-Free: 0 800 6397678 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

United Kingdom:

ISO 9001 Certified

OMEGA Engineering Ltd.
One Omega Drive
River Bend Technology Centre
Northbank , Irlam, Manchester M44 5BD England
Toll-Free: 0800-488-488 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Servicing Europe:

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
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.

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 2009 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translat-

ed, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent
of OMEGA ENGINEERING, INC.

RETURNS, please have the following

RETURN REQUESTS/INQUIRIES

FOR NON-WARRANTY REPAIRS,
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.

consult OMEGA

Unpacking

Remove the Packing List and verify that you have received all
equipment. If you have any questions about the shipment, please
call the OMEGA Customer Service Department at:

1-800-622-2378 or 1-203-359-1660. We can also be reached on the
Internet at omega.com

e-mail: [e-mail]

When you receive the shipment, inspect the container and
equipment for signs of damage. Note of any evidence of rough
handling in transit. Immediately report any damage to the
shipping agent.

NOTE

The carrier will not honor any claims unless all shipping
material is saved for their examination. After examining and
removing contents, save packing material in event reshipment
is necessary.

NOTE

The following items are supplied in the box:

• Rotary Selector Switch

• Mounting Hardware (hex nuts,
lock washers, flat washers)

• Terminal Screws

• Terminal Washers

• Template

• Extension Bezel

• User’s Guide

SW14 1/4 DIN Series and OSW Series
Rotary Selector Switches

SW14 Series

Page

Section 1 SW14 Series Introduction . . . . . . . . . . . . . . . . . . . . 1.1

Section 2 SW14 Series Wiring . . . . . . . . . . . . . . . . . . . . . . . . 2.1

Section 3 SW14 Series Mounting . . . . . . . . . . . . . . . . . . . . . . 3.1

Section 4 SW14 Series Specifications . . . . . . . . . . . . . . . . . . . 4.1

OSW Series

Section 5 OSW Series Introduction . . . . . . . . . . . . . . . . . . . . 5.1

Section 6 OSW Series Wiring . . . . . . . . . . . . . . . . . . . . . . . . 6.1

Section 7 OSW Series Mounting . . . . . . . . . . . . . . . . . . . . . . . 7.1

Section 8 OSW Series Specifications . . . . . . . . . . . . . . . . . . . . 8.1

TABLE OF

CONTENTS

i i

1-1

1

SW14 Series

Introduction

1.1 General Description

The SW14 Series rotary selector switches are designed to
provide isothermal, low-resistance switching in your temperature
measuring circuits. The isothermal design minimizes temperature
gradients between the input and the output thermocouple wiring
to avoid the generation of thermal EMF’s that add error to your
thermocouple temperature measuring circuits. Temperature­sensitive resistance transducers such as RTD’s and thermistors can
be switched with confidence, knowing that the low contact
resistance will not add any appreciable error to the measurement.

The SW14 models are 1/4DIN size and offer 2 to 34 positions in
two, three or four-pole versions.

The SW14 selector switch can be mounted into an existing 1/4 DIN
panel cutout.

To allow matching of a readout device in all switch positions, the
“off” position of each switch may be shorted or left as an open
circuit. Each pole is fully isolated. For quick and easy wiring, the
terminals located at the rear of the switch are clearly marked.

All switches are available with the standard round knob, or a
pistol-grip handle, and gold or silver plated contacts.

1-2

2.1 Wiring Procedure

When a switch is used for thermocouple circuitry, it is important

that the switch terminals are in a uniform temperature

environment. For example, cool or hot air drafts should be

avoided. Environmental temperature gradients can introduce

errors in thermocouple readings in spite of the switch’s isothermal

design.

The switch input wiring connections are housed in a circular base

unit defined as a single pole. Standard pole configurations consist

of two, three, or four poles. The end user determines which pole is

“+” and “-”. The terminal at the “contact rings” is used to connect

to the readout instrument.

Connect the inputs to each pole while maintaining a uniform color

code. Thermocouple circuits use red for the negative, and in RTD

circuits, red indicates positive. It does not matter which terminals

are used as long as the output is wired in the same manner as the

input. As the selector is rotated, each pole will be connected in

turn to the output without crossing the circuit wires.

The quick wire ring acts to guide the stripped lead directly under

the head of the terminal screws. At that point the screw can be

Lowered t fasten the wire securely (see diagram, page 2-2).

02-1

2

SW14 Series Wiring Procedure

2-2

2 SW 14 Series Wiring Procedure

SWITCHING

QUICK WIRE RING

#35 IS COMMON

LINK

WIRING PROCEDURE:

1. STRIP LEAD WIRE 5/16".

2. TWIST LEAD IF USING STRANDED TYPE WIRE.

3. WITH A SLOTTED SCREWDRIVER, RAISE SCREW
HIGH ENOUGH TO CLEAR WIRE DIAMETER.

4. INSERT STRIPPED LEAD THRU HOLE IN THE
QUICK WIRE RING AND UNDER THE SHOULDER
OF THE SCREW HEAD.

5. TURN SCREW TO SECURE WIRE.

6. DO NOT OVERTIGHTEN.
NOTE: RECOMMENDED WIRE - 20-24 GAGE
THE O3 5/8" PANEL CUTOUT FOR MOUNTING THE
SWITCH LIMITS THE PREWIRING OF HEA

VIER

GAGE
WIRE UNTIL AFTER THE SWITCH IS MOUNTED TO
THE PANEL.

35

34

33

32

31

1

2

5/16"
MIN.

NOTE: THE QUICK WIRE RING
IS REQUIRED AS A BARRIER
TO ISOLATE CONTACTS.

Figure 2-1. SW14 Series Wiring Procedure

02-3

SW 14 Series Wiring Procedure 2

–

INSTRUMENT

EXAMPLE: 6 POSITION

2 POLE WIRING

(USE T/C WIRE BETWEEN

SENSOR, SWITCH &

INSTRUMENT)

#6-32 HEX NUT

5/8 DIA. FLAT WASHER

#6 LOCK WASHER

NOTE:
THE QUICK WIRE RING HAS BEEN
REMOVED FROM ILLUSTRATION FOR
CLARITY, HOWEVER, THE QUICK WIRE
RING IS REQUIRED AS A BARRIER TO
ISOLATE CONTACTS.

BOTTOM VIEW

OF SWITCH

T/C

SHORTING LINK
(OFF POSITION
ALWAYS)

TOP VIEW

OF SWITCH

CONTACT RINGS
(COMMON)

+

+

–

–

+

(USE COPPER WIRE BETWEEN
SWITCH & INSTRUMENT)

SERIES 900 THERMISTOR
or 2 WIRE RTD

SECURITY FASTENERS RETAIN THE
QUICK WIRE RING AND ARE NOT IN
THE ELECTRICAL CIRCUIT

Figure 2-2. SW14 Series 2 Pole Wiring

2 SW14 Series Wiring Procedure

2-4

BLACK

RED

BLACK

COM.

COM.

(USE COPPER WIRE
BETWEEN SWITCH
& INSTRUMENT)

3-WIRE RTD

SECURITY FASTENERS RETAIN THE
QUICK WIRE RING AND ARE NOT IN
THE ELECTRICAL CIRCUIT

–

INSTRUMENT

EXAMPLE: 6 POSITION

3 POLE WIRING

#6-32 HEX NUT

5/8 DIA. FLAT WASHER

#6 LOCK WASHER

NOTE:
THE QUICK WIRE RING HAS BEEN
REMOVED FROM ILLUSTRATION FOR
CLARITY, HOWEVER, THE QUICK WIRE
RING IS REQUIRED AS A BARRIER TO
ISOLATE CONTACTS.

BOTTOM VIEW

OF SWITCH

TOP VIEW

OF SWITCH

CONTACT RINGS
(COMMON)

+

+

–

Figure 2-3. SW14 Series 3 Pole Wiring

12-5

SW14 Series Wiring Procedure 2

4 WIRE
CONFIGURATION

2 WIRE CONFIGURATION
PLUS LOOP

SECURITY FASTENERS RETAIN THE
QUICK WIRE RING AND ARE NOT IN
THE ELECTRICAL CIRCUIT

–

RED

BLACK

INSTRUMENT

EXAMPLE: 6 POSITION

4 POLE WIRING

#6-32 HEX NUT

5/8 DIA. FLAT WASHER

#6 LOCK WASHER

NOTE:
THE QUICK WIRE RING HAS
BEEN REMOVED FROM
ILLUSTRATION FOR CLARITY,
HOWEVER, THE QUICK WIRE
RING IS REQUIRED AS A

BOTTOM VIEW

OF SWITCH

TOP VIEW

OF SWITCH

CONTACT RINGS
(COMMON)

+

+

––

–

+

(USE COPPER WIRE
BETWEEN SWITCH
& INSTRUMENT)

4-WIRE RTD

BLACK

RED

BLACK

RED

RED

BLACK

+

–

Figure 2-4. SW14 Series 4 Pole Wiring

3.1 Mounting the switch into a 1/4 DIN Panel Cutout

1. Cut out jack panel to 3.622" x 3.622" (92mm x 92 mm
dimensions.

2. Pass the switch through the panel cutout.

3. Apply the hardware provided in the order shown in Figure 3-1.

4. Tighten nuts.

5/8 DIA. FLAT WASHER

#6-32 HEX NUT

#6 LOCK W

ASHER

PAN EL
CUTOUT

PANEL

SELECTOR
SWITCH

Figure 3-1. 1/4 DIN Panel Mounting

3-1

3 SW 14 Series Mounting Procedure

03-2

3.2 Standard Panel Mounting

1. Use the template provided to make a panel cut.

2. Pass the switch through the panel cutout, aligning the

mounting studs through the holes.

3. Apply the hardware provided in the order shown in Figure 3-2.

4. Tighten nuts.

5/8 DIA. FLAT WASHER

#6-32 HEX NUT

#6 LOCK W

ASHER

PANEL

SELECTOR
SWITCH

Figure 3-2. Selector Switch Standard Panel Mounting

OSW Series Mounting Procedure 3

3 SW14 Series Mounting Procedure

3-3

45 10'

No. 18 (0.1695) DRILL

4 HOLES EQUALLY SPACED

(STANDARD WITH JACK PANELS)

E

F

HOLE PATTERN

C

B

A

4 POLE

3 POLE

2 POLE

PAN EL

D

3-4

EXTENSION BEZEL

5/8 DIA. FLAT WASHER

#6-32 HEX NUT

#6 LOCK WASHER

PANEL

IN THE EVENT THAT THE PANEL CUTOUT
EXCEEDS THE RECOMENDED DIAMETER OF
3 1/2" BUT IS LESS THAT 4 1/4", AN
EXTENSION BEZEL (INCLUDED W/PRODUCT)
MAY BE INSTALLED BETWEEN THE FACEPLATE
OF THE 1/4 DIN SWITCH AND THE PANEL
IT IS BEING MOUNTED TO, USING STANDARD
HARDWARE.

1/4 DIN
SELECTOR
SWITCH

SW14 Series Mounting Procedure 3

Figure 3-4. Installing an Extension Bezel

4-1

4

SW14 Series Specifications

Insulation Resistance: 20MΩ at 300 volts dc

Contact Resistance: 0.004Ω or less

Case Material: Noryl SPN-420

Weight:

2-pole switch: 3/4 lbs.
3-pole switch: 1 lb.
4-pole switch: 1 1/4 lb.

Hardware and box: 3/4 lbs.

Continuous Use
Temperature: 110°C

5

OSW Series Introduction

5.1 General Description

The OSW Series rotary selector switches are designed to
provide isothermal, low-resistance switching in your temperature
measuring circuits. the isothermal design minimizes temperature
gradients between the input and the output thermocouple wiring
to avoid the generation of thermal EMF’s that add error to your
thermocouple temperature measuring circuits. Temperature­sensitive resistance transducers such as RTD’s and thermistors
can be switched with confidence, knowing that the low contact
resistance will not add any appreciable error to the measurement.

The OSW two-pole switches are available in either 3" or 5"
diameter housing, depending on the number of positions (refer to
Selection Guides on page 5-2). All of the three-pole versions have
a 5" diameter housing. Two to 40 positions, in addition to OFF,
are available in a designer style unbreakable Noryl case. (Note
that the 3-pole version has no OFF position).

To allow matching of a readout device in all switch positions, the
“off” position of each switch may be shorted of left as an open
circuit. Each pole is fully isolated. For quick and easy wiring, the
terminals located at the rear of the switch are clearly marked.

All switches are available with the standard round knob, or a
pistol-grip handle, and gold or silver plated contacts.

5-1

5-2

6

OSW Series Wiring Procedure

6.1 Wiring Procedure

In most cases, the switches are used to connect one of several
Alternative sensor inputs to a single instrument. The instructions
that follow apply to this usual case. However, the rotary switch is
bi-directional and can also connect a single input to one of
several outputs.

When an OSW switch is used for thermocouple circuitry, make
sure that the switch terminals are in a uniform temperature
environment. Avoid hot or cool air drafts. Environmental
temperature gradients can introduce error in thermocouple
readings in spite of the switch’s isothermal design.

The switch input wiring connections are at the rear of the housing,
arranged in concentric rings. The outermost ring is labeled “+”,
the next is “-”, and in three-pole models, the innermost ring is
labeled “COM”. The output terminals are inside the concentric
rings of terminals and are labeled “+,-,COM” to match the inputs.

Attach the input and output leads to the terminals with the screws
and washers supplied in a separate package with each rotary
switch.

6-1

6-2

6 OSW Series Wiring Procedure

The switches are also supplied with a screw and nut to provide
a short circuit for the OFF position, if desired. Figure 6-1 shows
the terminal configuration of the two-pole models as well as the
attachment hardware. Figure 6-2 shows the wiring configuration

for two-pole models. Figures 6-3 and 6-4 show the terminal
configuration and wiring for three-pole switches.

6-3

OFF

1

4

7

14

#4-40 x 1/2 PAN HEAD SCREW
(SHORTING SCREW)

OFF POSITION

SHORTING SCREW ASSEMBLY
#4-40 NUT

TYPICAL HARDWARE
ASSEMBLY

#6 FLAT WASHER

#6 LOCK WASHER

#6-32 HEX NUT

Figure 6-1. OSW Two-Pole Switch and Hardware - Rear View

SW14 Series Wiring Procedure 6

6-4

6 OSW Series Wiring Procedure

SERIES 900 THERMISTER*

(+)

(–)

(+)

(–)

EITHER
OR

THERMOCOUPLE**

* USE COPPER WIRE FOR
HOOK UP

** USE THERMOCOUPLE WIRE
FOR HOOK UP

INSTRUMENT

(+)

(–)

Figure 6-2. OSW Two-Pole Switch and Hardware - Rear View

6-5

OSW Series Wiring Procedure 6

Figure 6-3. OSW Three-Pole Switch (hardware not shown)

Rear View

6 OSW Series Wiring Procedure

6-6

(+)

COM

RTD SENSOR

INSTRUMENT

(+)

(–)

NOTE: USE COPPER
WIRE FOR HOOK UP

(–)

BLACK

RED

BLACK

COM

COM

Figure 6-4. OSW Three-Pole Wiring

1. Use the template provided to make a panel cutout.

2. Pass the switch through the panel cutout, aligning the
mounting studs through the holes.

3. Apply the hardware provided in the order shown in Figure 7-1.

4. Tighten nuts.

7-1

7

OSW Series Mounting Procedure

Figure 7-1. Mounting the Selector Switch

5/8 DIA. FLAT WASHER

#6-32 HEX NUT

#6 LOCK W

ASHER

PANEL

SELECTOR
SWITCH

7-2

F

HOLE PATTERN

NO. 18 (0.1695) DRILL

4 HOLES EQUALLY SPACED

G

.45° ± 10'

3 Pole

E

A

D

B

C

17-3

EXTENSION BEZEL

5/8 DIA. FLAT WASHER

#6-32 HEX NUT

#6 LOCK WASHER

PANEL

IN THE EVENT THAT THE PANEL CUTOUT
EXCEEDS THE RECOMMENDER DIAMETER,
AN EXTENSION BEZEL (INCLUDING W/PRODUCT)
MAY BE INSTALLED BETWEEN THE FACEPLATE
OF THE SWITCH AND THE PANEL IT IS BEING
MOUNTED TO. USING STANDARD HARDWARE.

SELECTOR
SWITCH

OSW Series Mounting Procedure 7

Figure 7-3. Installing an Extension Bezel

8-1

8

OSW Series

Specifications

Insulation Resistance: 20MΩ at 300 volts dc

Contact Resistance: 0.004Ω or less

Case Material: Noryl 731

Weight:

3" switch: 3/4 lbs.
5" switch: 1 1/4 lbs.

Hardware and box: 3/4 lbs.

Continuous Use
Temperature: 110°C

8

8-2

NOTES

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 ha ving 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.

M1940/0907

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