#  Bi-Directional Thermostatic Controller

 Maintains constant temperature in an enclosure when ambient temperature varies greatly

A Bi-Directional Thermostatic Controller operates in the same manner as a Single Directional Controller, except output can operate in both heating and cooling modes. Controllers with a bi-directional output are used for maintaining a constant temperature within an enclosure surrounded by an ambient environment with a much larger temperature swing. This is commonly experienced in an outdoor environment. Laird Thermal Systems offers a microcontroller based device with integrated temperature control for cooling and heating of thermoelectric assemblies requiring precise temperature control. The TC-XX-SR-54 has three programmable fan outputs, alarm output relay and alarm condition LEDs. The parameters will be programmed by Laird Thermal Systems according to customer specifications.

![](/thermal-wizard/images/tc/SR-54/SR-54-large.png)

## Applications

- [Medical Equipment](/thermal-technical-library/application-notes/bi-directional-microcontrollers-monitor-and-protect-medical-equipment)
- [Cooling for Centrifuges](/applications/cooling-for-centrifuges)
- [Heating and Cooling of Incubator Chambers](/thermal-technical-library/application-notes/heating-and-cooling-incubator-chambers)
- [Semiconductor Fabrication Equipment Cooling](/applications/semiconductor-fabrication-equipment-cooling)

## Related Content

- [TC-XX-SR-54 User Manual](/de/thermal-technical-library/user-manuals/tc-xx-sr-54-user-manual)

## Products in this series

- [TC-XX-SR-54](/thermal-wizard/images/tc/SR-54/SR-54-datasheet.pdf) — MFG Part Number: 157005254

 \* Any information furnished by Tark Thermal Solutions and its agents is believed to be accurate and reliable. All specifications are subject to change without notice.

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