A simple definition of pressure is the force exerted by a gas or fluid over an area. Another method of defining pressure is in terms of a column of liquid, where pressure is directly related to the height and density of the liquid. In a pressure transducer energy in the form of pressure is sensed and converted to an electrical signal (current or voltage). The relation between the actual electrical output to the theoretical output across the pressure range of the unit is termed as the accuracy of the transducer or transmitter. Pressure is an important parameter in industrial applications, HV-AC management, as well as weather monitoring.

Sigma offers a variety of digital indicators and controlers to interface with the available sensors.