Pressure transmitter is one of the important parameters in industrial production, and it is essential to monitor and control the pressure during the production process. Pressure transmitters measure gauge, absolute, and negative pressures of liquids or gases. What does the various pressures measured by the pressure transmitter mean, and what are the advantages of caring between them? Absolute pressure (Pi): Refers to all pressures in the space of the medium to be measured, relative to the zero pressure. Atmospheric pressure (Pq): The earth’s surface is covered with a thick layer of air, and objects in the atmosphere are subject to the pressure caused by the impact of air molecules. It is related to the altitude, latitude and meteorological conditions of the location. Gauge pressure (Pb): Also known as relative pressure, it refers to the difference between the real pressure of the system and the atmospheric pressure, that is, Pb=Pi-Pq. Vacuum degree (Pz): When the absolute pressure value is less than the atmospheric pressure value, the gauge pressure is negative (i.e., the pressure is negative), and the absolute value of this negative pressure is the vacuum degree. Next, let’s use a diagram to understand their relationship more intuitively.

As can be seen in the diagram, when the system P > atmospheric pressure, absolute pressure = atmospheric pressure + gauge pressure: when the system P < atmospheric pressure, absolute pressure = atmospheric pressure – gauge pressure. If you have any questions about product consultation, product customization, agency, technical inquiry, quotation, etc., please contact Xingyi: 400-600-4496!