SW14
1
⁄4 DIN Series and OSW Series
Rotary Selector Switches
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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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.
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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
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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.
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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: info@omega.com
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.
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