Method, device, use and installation for gas density monitoring

A density monitor for monitoring a gas density of a noxious gas, comprising:

• a measuring volume,
• a connection for connecting the measuring volume to a space containing the noxious gas,
• a closed reference volume which is filled with a reference gas which is different from the noxious gas to be monitored and which has a global warming potential GWP<100, where said GWP denotes the CO2-dequivalent in relation to 100 years according to IPCC AR5, the reference gas being filled during the intended operation of the density monitor with an overpressure compared with a standard pressure of the noxious gas or a filling pressure of the noxious gas,
• a partition wall which separates the reference volume from the measuring volume,
• a partition wall deflection detection device for detecting a deflection of the partition wall, and
• a spring device for elastically exerting a force on the partition wall in order to compensate for the overpressure in the reference volume.

Use of a density monitor for monitoring a gas density of a noxious gas, the density monitor comprising:

• a measuring volume,
• a connection for connecting the measuring volume to a space containing the noxious gas,
• a closed reference volume,
• a partition wall which separates the reference volume from the measuring volume,
• a partition wall deflection detection device for detecting a deflection of the partition wall, and
• a spring device for elastically exerting a force on the partition wall,
• wherein the reference volume contains a reference gas which is different from the noxious gas to be monitored and which has a global warming potential GWP<100, where said GWP denotes the CO2-equivalent in relation to 100 years according to IPCC AR5, with a reference gas pressure which is greater than a filling pressure of the noxious gas, and
• wherein a force acting on the partition wall due to the reference gas pressure increased compared to the filling pressure of the noxious gas in the reference volume is compensated by means of the spring device.