Abstract: The invention relates to a density monitor (10) for monitoring a gas density in a gas chamber (20). The density monitor (10) comprises a measuring apparatus (12) having a first measuring device (24) and a second measuring device (28), the two measuring devices (24; 28) being coupled together. The first measuring device (24) is designed to measure a first pressure range (62) in relative terms with respect to an atmosphere, and the second measuring device (28) is configured to measure a second pressure range (64) in absolute terms. The density monitor (10) further comprises an indicator device (50), which is designed to indicate the two pressure ranges (24; 28).

Abstract: The invention relates to a density monitor (10) for monitoring a gas density in a gas chamber (20). The density monitor (10) comprises a measuring apparatus (12) having a first measuring device (24) and a second measuring device (28), the two measuring devices (24; 28) being coupled together. The first measuring device (24) is designed to measure a first pressure range (62) in relative terms with respect to an atmosphere, and the second measuring device (28) is configured to measure a second pressure range (64) in absolute terms. The density monitor (10) further comprises an indicator device (50), which is designed to indicate the two pressure ranges (24; 28).

Abstract: To improve the reliability of gas space monitoring of a gas space (17) of an electrical system (40) filled with a harmful gas, the invention provides a multi-path valve device (44) for connecting a density monitor (20) to a system to be monitored for gas density, comprising a first gas connection (13) for connecting the valve device (44) to the system, a second gas connection (14) for connection to the density monitor (20), a third gas connection (15) for connection of a testing device (19) for testing the function of the density monitor (20), and switching device for selectively connecting the second gas connection (14) to the first gas connection (13) or the third gas connection (15).

Abstract: To improve the reliability of gas space monitoring of a gas space (17) of an electrical system (40) filled with a harmful gas, the invention provides a multi-path valve device (44) for connecting a density monitor (20) to a system to be monitored for gas density, comprising a first gas connection (13) for connecting the valve device (44) to the system, a second gas connection (14) for connection to the density monitor (20), a third gas connection (15) for connection of a testing device (19) for testing the function of the density monitor (20), and switching device for selectively connecting the second gas connection (14) to the first gas connection (13) or the third gas connection (15).

Abstract: Density monitor for monitoring a gas density in a measuring volume, including a membrane which communicates with the measuring volume in such a way as to move in the measuring volume when a gas density changes, and a membrane movement detection device connected to the membrane, for converting a membrane movement into an electrical signal. The membrane movement detection device is coupled to the membrane by a transmission element for mechanically amplifying the membrane movement path.

Abstract: Density monitor including an overall housing, which is divided into a measurement section housing part and a cable connection housing part.

Abstract: A density monitor is used for monitoring a gas density in a measured volume with a separating wall which separates a first reference chamber formed in a density monitor housing from the measured volume. The density monitor further includes a separating wall movement detection device for detecting movement of the separating wall. In order to reduce false alarms, a second reference chamber is formed outside of the density monitor housing. The second reference chamber is fluidically connected to the first reference chamber by a fluid line.

Abstract: A density monitor is used for monitoring a gas density in a measured volume with a separating wall which separates a first reference chamber formed in a density monitor housing from the measured volume. The density monitor further includes a separating wall movement detection device for detecting movement of the separating wall. In order to reduce false alarms, a second reference chamber is formed outside of the density monitor housing. The second reference chamber is fluidically connected to the first reference chamber by a fluid line.