Diaphragm gas meter
A diaphragm gas meter is a gas meter for measuring the gas volume flow by means of displacement measurement . In 1878 Emil Haas received a patent from Elster gas measuring devices for the principle of the rigidly limited measuring space for the measuring volume. He was a co-founder of the Mainz gas knife factory Elster & Cie, (today (2018) Elster Group ), at that time with around 500 employees in the main plant in Mainz.
functionality
Measuring chambers separated from one another by membranes are periodically filled and emptied. A joint transmission transmits the diaphragm movement to a crankshaft . The crankshaft drives two slides that control the gas flow. The gas flow is thus alternately directed through a bellows (tipping bucket). The rotary movement of the gear is transmitted to a counter via a magnetic coupling .
One chamber is always alternately connected to the outlet, i.e. the consumer connection. The opposite chamber is connected to the house connection (inlet). The pressure difference between the house connection and the consumer causes a force on the membrane. Gas is pushed into the house connection while the opposite chamber fills. The mechanical connection to the valve spool means that after emptying the next chamber is connected to the consumer connection and the process begins again.
The number of filling and emptying of the chambers is counted. Multiplied by the volume of the chambers results in the meter reading in m³.
They are mainly used as household gas meters and in industrial systems in the low-pressure range. In gas pressure regulating and gas measuring systems, they are usually only used up to size G65 for reasons of space and cost.
Web links
Individual evidence
- ↑ a b Convert gas - Cubic meter (m³) in kWh - Background information on the gas meter. Retrieved April 3, 2019 .