In what unit are vaporstat type pressure switches calibrated?

Vaporstat type pressure switches are calibrated in inches of water because they are designed to detect low pressure variations, particularly in applications involving gases or vapor. Inches of water is an appropriate unit for measuring these slight pressure differences, especially in systems where the pressures are relatively low, such as in a boiler or refrigeration system.

This unit is particularly sensitive to small changes in pressure, making it ideal for the precise control required in systems that utilize vaporstats. Other units like pounds per square inch or bar are more suitable for applications involving higher pressure ranges, while feet of mercury is typically used in situations where a higher range of pressure measurement is necessary, such as in vacuum systems or barometric pressures. Choosing the correct unit of measurement is crucial for setting the right operational tolerances and ensuring proper functioning of the system.