T Series
Bimetal Thermal Switches
Madison
Company offers a full range of thermal switches
that can be designed as a stand-alone temperature
sensor or combined into liquid
level switches.
The thermal switches are precisely calibrated devices
that cover a broad temperature range. Configurations
using snap-action bimetallic disk, bimetal slow
make/slow break, rod and tube and solid state construction
are also available to offer a broad array of temperature
control solutions.
The
bimetal contact movement is achieved using the different
expansion rates of two metals fused together.
This is
a creep action device, providing very-close-tolerance
temperature sensing and having small differential.
The set point range is 30° to 130°C. All thermal
switches
are factory-calibrated to customer-defined set
point range. |
| Features: |
| • |
Bimetal construction |
| • |
Creep
action (slow make/slow break switching) or
snap action |
| • |
Low
differential between opening/closing temperatures |
| • |
Various contact types and ratings are available, depending on application |
| • |
Available
in open on rising temperature or close on
rising temperature configuration |
| • |
Close
on rising available from 30°C to 130°C
(86°F
to 266°F) |
| • |
Open
on rising available from 30°C to 125°C
(86°F
to 257°F) |
| • |
Accuracy
of ±5°C (9°F) |
| • |
Rated
life: ≥ 100,000 cycles, depending on
application |
| • |
Repeatability
of ±1°C (1.8°F) |
| • |
Small
size permits flexible and innovative product
enhancements |
|
|
| Typical
Applications: |
| • |
HVAC – room,
duct and refrigerant temperatures |
| • |
Process
Control – temperature regulation |
| • |
Appliances – cooking
and cleaning temperatures |
| • |
Motors – overload
protection |
|
|
| Specifications: |
| Sensor
Type |
Bimetal
Thermal Switch |
| Temperature
Range |
30°C
to 130°C (86°F to 266°F) |
| Temperature
Accuracy |
±5°C
(±9°F) – Special tolerances can be quoted |
| Sheath
Material |
Customer
defined, dependent on application |
| Termination
and Leads |
Customer
defined, dependent on application |
| Snap
Action |
Quick
make/quick break switching |
| Temperature
Differential |
In some cases, the differential between opening/closing temperatures can be specified from 2°C to 40°C (36°F to 104°F); most models have "zero" differential |
| Contact
Ratings |
Various ratings available, depending on application |
|
|
| Madison Company offers two types of Bimetal Switches: |
Creep Action
Creep action is when the switch element is designed to open slowly at the rated temperature. Many switches have a temperature differential between the opening and closing temperature. This type of action may be useful in an application where the switch is being used as a protection device for when the temperature of the process has rapid transient changes. The creep action tends to “average” the changes and prevent nuisance operation of the switch. This is also important because most of the temperature switches listed for protection applications are listed for a limited number of cycles. This type of switch is intended for use as a protection device only.
Snap Action
These switches are called snap action because they open very rapidly (“snap”) at the rated temperature. This type is usually best for thermostat applications. They typically have no (or very small) temperature differential between opening and closing. They will respond to relatively short-lived changes in temperature, which can make them cycle very frequently in applications where the temperature changes often. |
|
|
| All
specifications are subject to change without notice. |
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