Vacuum pressure gauges are used to measure negative pressure, that is, pressure lower than atmospheric or barometric pressure. Compound pressure gauges measure both positive and negative (vacuum) pressures.
Compound pressure gauges and vacuum gauges are used to measure the pressure or negative pressure of non-crystallized, non-condensing liquid, gas or vapor media that have no corrosive effect on steel, copper and copper alloys and do not have a risk of explosion. It is widely used in gas transportation, pipeline liquid and closed containers to measure the pressure of various liquids, gases, steam and other media without corrosiveness, explosion hazard, crystallization and non-condensable solids, such as various industrial automatic control environments, involving oil pipelines, water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military industry, petrochemical, oil wells, electric power, ships, machine tools, pipeline air supply, vacuum equipment and many other industries.
