The Bristol series 5453-40G Temperature Controller is part of the Bristol 624-II family of pneumatic instruments. It is designed for performance and durability where non-electric control is desired.  The high quality thermal system is the key component to the instrument's high accuracy. Thermal systems are available in Class 1 and Class 3 configurations and are offered in case-compensated or fully-compensated depending on the specific application.

Cost-effective to operate due to its very low air consumption rate, it is often used in steam plants, pulp and paper, wood drying, and building temperature control.