Rotary Thermocouple Selector Switches |
| OSW, SW142, SW143 and SW144 Series |
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For isothermal, low resistance switching of temperature measurement
circuits, OMEGA offers three styles of selector switches. The OSW style features
silver plated contacts, while the OSWG line includes gold plated contacts. The
SW14 1/4 DIN switches come with gold or silver-plated contacts. Each style
offers 2 to 34 positions in a break-resistant Noryl case.
The isothermal design of these
rotary switches minimizes
temperature gradients between the
input and output thermocouple
wiring. This in turn minimizes errors
in transmitting thermocouple signals
due to the generation of a thermal
emf at the wire junctions. The low
resistance of the silver or gold
plated contacts also enables
switching of temperature sensitive
resistance devices, such as RTDs
and thermistors.
Two pole
SW and OSW series switches have
a convenient . off. position.
The . off. position may be
left as an open circuit or shorted to
keep spurious signals from
registering on thermocouple
instruments.Each pole is fully
isolated. For quick and easy wiring,
the terminals located at the rear of
the switch are clearly marked.
OMEGA
is pleased to offer a rotary selector
switches in a 1/4 DIN size. Like
our other rotary selector switches,
this model is available with Break
Before Make and Make Before Break
contact action. Models are available
with 2 to 34 positions in 2, 3 or
4 pole versions. The 1/4 DIN switch also
has . jab-in. style connections.
No. of
Poles | Contact
Action | Size | No. of
Positions | Silver-Plated
Contacts
Model
No. | Gold-Plated
Contacts
Model
No. |
2
Pole
includes off |
Break
Before
Make |
3" |
2 | OSW3-2 | OSWG3-2 |
| 3 | OSW3-3 | OSWG3-3 |
| 4 | OSW3-4 | OSWG3-4 |
| 5 | OSW3-5 | OSWG3-5 |
| 6 | OSW3-6 | OSWG3-6 |
| 8 | OSW3-8 | OSWG3-8 |
| 9 | OSW3-9 | OSWG3-9 |
| 10 | OSW3-10 | OSWG3-10 |
Make
Before
Break |
3" |
12 | OSW3-12 | OSWG3-12 |
| 14 | OSW3-14 | OSWG3-14 |
| 16 | OSW3-16 | OSWG3-16 |
| 18 | OSW3-18 | OSWG3-18 |
| 20 | OSW3-20 | OSWG3-20 |
| 5" | 24 | OSW5-24 | OSWG5-24 |
| 28 | OSW5-28 | OSWG5-28 |
| 30 | OSW5-30 | OSWG5-30 |
| 32 | OSW5-32 | OSWG5-32 |
| 36 | OSW5-36 | OSWG5-36 |
| 40 | OSW5-40 | OSWG5-40 |
3
Pole
NO off |
Make
Before
Break |
5" |
6 | OSWT-6 | OSWGT-6 |
| 10 | OSWT-10 | OSWGT-10 |
| 12 | OSWT-12 | OSWGT-12 |
| 18 | OSWT-18 | OSWGT-18 |
| 20 | OSWT-20 | OSWGT-20 |
| 24 | OSWT-24 | OSWGT-24 |
| 28 | OSWT-28 | OSWGT-28 |
| 30 | OSWT-30 | OSWGT-30 |
| 32 | OSWT-32 | OSWGT-32 |
| 36 | OSWT-36 | OSWGT-36 |
| 40 | OSWT-40 | OSWGT-40 |
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| 1/4 DIN Units |
No. of
Poles | No. of
Positions | Silver-Plated Contacts
Model No. | Gold-Plated Contacts
Model No. |
2
includes
off Positon | 2 | SW142-2-(*) | SW142G-2-(*) |
| 4 | SW142-4-(*) | SW142G-4-(*) |
| 6 | SW142-6-(*) | SW142G-6-(*) |
| 8 | SW142-8-(*) | SW142G-8-(*) |
| 10 | SW142-10-(*) | SW142G-10-(*) |
| 12 | SW142-12-(*) | SW142G-12-(*) |
| 16 | SW142-16-(*) | SW142G-16-(*) |
| 18 | SW142-18-(*) | SW142G-18-(*) |
| 20 | SW142-20-(*) | SW142G-20-(*) |
| 24 | SW142-24-(*) | SW142G-24-(*) |
| 30 | SW142-30-(*) | SW142G-30-(*) |
| 34 | SW142-34-(*) | SW142G-34-(*) |
3
NO
off Positon | 2 | SW143-2-(*) | SW143G-2-(*) |
| 4 | SW143-4-(*) | SW143G-4-(*) |
| 6 | SW143-6-(*) | SW143G-6-(*) |
| 8 | SW143-8-(*) | SW143G-8-(*) |
| 10 | SW143-10-(*) | SW143G-10-(*) |
| 12 | SW143-12-(*) | SW143G-12-(*) |
| 16 | SW143-16-(*) | SW143G-16-(*) |
| 18 | SW143-18-(*) | SW143G-18-(*) |
| 20 | SW143-20-(*) | SW143G-20-(*) |
| 24 | SW143-24-(*) | SW143G-24-(*) |
| 30 | SW143-30-(*) | SW143G-30-(*) |
| 34 | SW143-34-(*) | SW143G-34-(*) |
4
NO
off Positon | 2 | SW144-2-(*) | SW144G-2-(*) |
| 4 | SW144-4-(*) | SW144G-4-(*) |
| 6 | SW144-6-(*) | SW144G-6-(*) |
| 8 | SW144-8-(*) | SW144G-8-(*) |
| 10 | SW144-10-(*) | SW144G-10-(*) |
| 12 | SW144-12-(*) | SW144G-12-(*) |
| 16 | SW144-16-(*) | SW144G-16-(*) |
| 18 | SW144-18-(*) | SW144G-18-(*) |
| 20 | SW144-20-(*) | SW144G-20-(*) |
| 24 | SW144-24-(*) | SW144G-24-(*) |
| 30 | SW144-30-(*) | SW144G-30-(*) |
| 34 | SW144-34-(*) | SW144G-34-(*) |
* Specify contact action: "B" = Break Before Make, "M" = Make Before Break.
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† Price are shown in RMB.
Note: 9/25/15 deleted Pistol Grip Handle. DAJ
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Part Number Builder |
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Option Descriptions
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(1)
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Switch Style and Size
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Select
SW142 for 1/4 DIN 2 pole silver-plated contacts
SW142G for 1/4 DIN 2 pole gold-plated contacts
SW143 for 1/4 DIN 3 pole silver-plated contacts
SW143G for 1/4 DIN 3 pole gold-plated contacts
SW144 for 1/4 DIN 4 pole silver-plated contacts
SW144G for 1/4 DIN 4 pole gold-plated contacts
OSW3 for 3in. size 2 pole silver-plated contacts
OSWG3 for 3in. size 2 pole gold-plated contacts
OSW5 for 5in. size 2 pole silver-plated contacts
OSWG5 for 5in. size 2 pole gold-plated contacts
OSWT for 5in. size 3 pole silver-plated contacts
OSWGT for 5in. size 3 pole gold-plated contacts
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(2)
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Number of Positions
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Select
2 for 2 positions
3 for 3 positions
4 for 4 positions
5 for 5 positions
6 for 6 positions
8 for 8 positions
9 for 9 positions
10 for 10 positions
12 for 12 positions
14 for 14 positions
16 for 16 positions
18 for 18 positions
20 for 20 positions
24 for 24 positions
28 for 28 positions
30 for 30 positions
32 for 32 positions
34 for 34 positions
36 for 36 positions
40 for 40 positions
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(3)
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Contact Action(SW series only)
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Select
Nothing(leave field blank) for OSW series
-B for break before make
-M for make before break
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NOTE: All combinations may not be valid, check spec sheet for valid part numbers.
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