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Rotary Thermocouple Selector Switches
OSW, SW142, SW143 and SW144 Series
PLACE ORDER - 3", 5" and 1/4 DIN Sizes
- Gold or Silver Plated Contacts
- 2 or 3 Poles in 76 mm (3") and 127 mm (5") sizes
- 2, 3, or 4 Poles in 1/4 DIN Size
- 2 to 34 Positions
- Wire Connecting Screws Included
Description
Description
For isothermal, low resistance switching of temperature measurement circuits, trodeks 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 theserotary switches minimizestemperature gradients between theinput and output thermocouplewiring. This in turn minimizes errorsin transmitting thermocouple signalsdue to the generation of a thermalemf at the wire junctions. The lowresistance of the silver or goldplated contacts also enablesswitching of temperature sensitiveresistance devices, such as RTDsand thermistors.
Two pole SW and OSW series switches havea convenient . off. position.The . off. position may beleft as an open circuit or shorted tokeep spurious signals fromregistering on thermocoupleinstruments.Each pole is fullyisolated. For quick and easy wiring,the terminals located at the rear ofthe switch are clearly marked.
trodeks is pleased to offer a rotary selectorswitches in a 1/4 DIN size. Likeour other rotary selector switches,this model is available with BreakBefore Make and Make Before Breakcontact action. Models are availablewith 2 to 34 positions in 2, 3 or4 pole versions. The 1/4 DIN switch alsohas . 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 | | | 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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