Common Mode pressure

common-mode pressure issues are to be considered when pressure sensors are used to measure differential pressure.

This is especially true for applications such as medical instrumentation, environmental controls and heating ventilating and air conditioning (HVAC) systems where low pressure sensors are commonly used.

Just as common-mode errors can occur in an electrical circuit, the common-mode pressure can cause concerns for the pressure measurement. Even though the ΔP pressure drop can be quite small, the pressure on the opposite sides of the pressure sensor due to the line pressure can be quite high. Two areas that frequently require additional attention by the supplier and the user are maximum pressure ratings and common-mode pressure errors.